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新疆温泉县别珍套山新元古代花岗岩LA-ICP-MS锆石U-Pb年龄、地球化学特征及其成因

曾祥武, 赵军, 聂晓勇

曾祥武, 赵军, 聂晓勇. 2020: 新疆温泉县别珍套山新元古代花岗岩LA-ICP-MS锆石U-Pb年龄、地球化学特征及其成因. 地质通报, 39(2-3): 177-193.
引用本文: 曾祥武, 赵军, 聂晓勇. 2020: 新疆温泉县别珍套山新元古代花岗岩LA-ICP-MS锆石U-Pb年龄、地球化学特征及其成因. 地质通报, 39(2-3): 177-193.
ZENG Xiangwu, ZHAO Jun, NIE Xiaoyong. 2020: LA-ICP-MS zircon U-Pb age, geochemistry and genesis of Neoproterozoic granitoids in the Biezhentao Mountain of Wenquan County, Xinjiang. Geological Bulletin of China, 39(2-3): 177-193.
Citation: ZENG Xiangwu, ZHAO Jun, NIE Xiaoyong. 2020: LA-ICP-MS zircon U-Pb age, geochemistry and genesis of Neoproterozoic granitoids in the Biezhentao Mountain of Wenquan County, Xinjiang. Geological Bulletin of China, 39(2-3): 177-193.

新疆温泉县别珍套山新元古代花岗岩LA-ICP-MS锆石U-Pb年龄、地球化学特征及其成因

基金项目: 

中国地质调查局项目《西北华北重点地区地质矿产调查评价》 12120115041301

详细信息
    作者简介:

    曾祥武(1977-), 男, 硕士, 高级工程师, 从事多金属矿产勘查工作和区矿调工作。E-mail:tzxw126@126.com

  • 中图分类号: P534.3;P588.12+1

LA-ICP-MS zircon U-Pb age, geochemistry and genesis of Neoproterozoic granitoids in the Biezhentao Mountain of Wenquan County, Xinjiang

  • 摘要:

    对新疆温泉县别珍套山新元古代花岗岩开展了相关研究。获得了3个片麻状-眼球状花岗岩4件锆石样品年龄,其中206Pb/238U年龄值一致,大多集中在910~950 Ma之间。极少量继承锆石的年龄大于1000 Ma。这些花岗岩以特有的粗粒、巨大的眼球状片麻结构为特征。岩体具有高硅(≥ 70%)、富碱(K2O+Na2O,6.5%~8.9%)且K2O>Na2O的特征,表现出从钙碱性到钾玄岩演化的变化趋势。稀土元素特征表明其与碱性花岗岩相似。样品的微量元素蛛网图几乎完全相同,均明显亏损Ba、Nb、Ta、Sr、P、Ti,富集Rb、Th、U、K等元素,显示活动大陆边缘岩石特征。全岩Sr-Nd同位素特征表明具典型壳源花岗岩(S型花岗岩)的特征。Lu-Hf同位素特征表明单阶段Hf模式年龄(tDM1)为883~1351 Ma,平均为1133 Ma;二阶段Hf模式年龄(tDM2)为891~1588 Ma,平均为1250 Ma,与锆石形成年龄较接近。新元古代早期(约9 Ga)片麻状花岗岩可能是与Rodinia超大陆会聚有关的格林维尔期造山作用、地壳增厚导致地壳物质部分熔融的产物。

    Abstract:

    The Neoproterozoic granites of the Biezhentao Mountain in Wenquan County of Xinjang were studied in this paper.Four LA-ICP-MS zircon U-Pb ages of 910~950 Ma were obtained for granitic gneisses in the Biezhentao Mountain of Wenquan County of Xinjiang.These new zircon LA-ICP MS U-Pb ages, together with previously published data, indicate that the granites were emplaced during 910~950 Ma.A few inherited old zircons U-Pb ages of >1000 Ma were found in all dated samples; they may have derived from the source rocks. These granitoids are characterized by a very coarse grained and huge augen gneiss texture. Major element data indicate that they belong to peraluminous monzogranite, with SiO2 (≥ 70%), K2O+Na2O (6.5%~8.9%), and K2O > Na2O, thus defined as calc-alkaline to shoshonitic rocks. These rocks show nearly parallel REE patterns with different abundances and distinct negative Eu anomalies. All the granitoids display similar spider diagrams with obvious negative anomalies of Ba, Nb, Ta, Sr, P and Ti, and obvious enrichment of Rb, Th, U, K. Sr-Nd data suggest that the protoliths of Neoproterozoic granitoids belong to peraluminous S-type granites. Zircon εHf (t) values range from +1.7 to +5.7, with model ages (tDM1) of 883~1351 Ma and model ages (tDM2) of 891~1588 Ma. Furthermore, with the age information on the ancient terranes of Tarim basin, the authors hold that the Tianshan ancient block probably formed a part of Rodina supercontinent during Early Neoproterozoic period and these granitoid rocks were linked to lithospheric thickening.

  • 赛里木地块位于温泉县博尔塔拉河断裂以南直至伊犁盆地北缘,发育古元古代变质基底,上覆长城系—震旦系盖层,以及早古生代和晚古生代的沉积地层。其中,古元古界温泉岩群出露区是天山造山带中仅有的几个变质基底出露区之一,是研究天山造山带元古宙陆壳形成、演化的重要场所。元古宙变质岩温泉群主要由片麻岩、片岩、大理岩、角闪岩、石英岩等组成[1],并含有火山岩和花岗岩[2]。这些变质岩沿科古琴山-别珍套山呈近东西向出露,一直延伸到哈萨克斯坦境内,被认为是天山基底的一部分[3-9],是研究天山地区前寒武纪地质历史的重要窗口。温泉岩群在博尔塔拉河南岸别珍套山北坡是在中国境内出露最完整的地区。在1:20万区调报告中,新疆温泉县别珍套山新元古代花岗岩被划为温泉岩群的变质岩系,20世纪90年代后,随着测年技术的不断进步,才逐步被识别出来。胡霭琴等[2, 10-12]对温泉岩群中的变质岩进行同位素年代学研究,不同时期采用不同方法获得了不同的年龄结果。胡霭琴等[2]对眼球状花岗片麻岩开展了SHRIMP锆石U-Pb测年,获得年龄值为913±13 Ma,并认为是其原岩(花岗岩)的形成年龄。胡霭琴等[11-12]对温泉岩群中片麻状花岗岩和斜长角闪岩开展了SHRIMP锆石U-Pb测年,其中,片麻状花岗岩的年龄约920 Ma,斜长角闪岩的年龄为450~455 Ma;另外,李孔森等[13]对温泉岩群中的花岗片麻岩、闪长岩(同胡霭琴等研究的斜长角闪岩)、混合岩浅色体同样进行了SHRIMP锆石U-Pb测年,其结果分别为907±11 Ma、452±7 Ma、926±12 Ma。这些研究工作最有意义之处在于:从温泉岩群中厘定出了变质侵入岩和弱变形侵入岩,分别代表早新元古代和晚奥陶世2期重要的岩浆活动。这些学者对该区岩浆岩研究主要偏重于年代学和岩石地球化学方面,缺乏空间分布和野外宏观特征的调查工作,制约了对该区前寒武纪以来构造-岩浆事件的反演。

    本文在详细分析前人资料的基础上,通过野外地质调查工作,对3个眼球状片麻状-眼球状花岗岩采集了4件锆石测年样品开展年代学研究,并结合主量、微量元素和Sm、Nd、Hf同位素地球化学特征,探讨天山新元古代早期岩浆岩形成的构造环境及在研究全球Rodinia超大陆演化中的意义。

    研究区位于中亚造山带新疆境内的西天山北缘,大地构造位置为准噶尔板块(Ⅰ级)伊犁-伊赛克湖微板块(Ⅱ级)赛里木地块(Ⅲ级)(参见区域地质调查报告(扎冷木特、柯克他乌、牧区医院、牙马特), 见图 1

    图  1  西天山温泉地区侵入岩分布简图(据参考文献修改)
    Figure  1.  Simplified intrusive rock map of the Wenquan area in West Tianshan

    研究区处于赛里木地块的北缘,古元古界温泉岩群(Pt1W.)的主体出露于本区,长城系特克斯岩群莫合西萨依岩组(Chm.)呈高角度构造面理与其接触,上覆少量晚古生代沉积地层。其中,温泉岩群主要为一套中深变质岩系,由长英质片麻岩和片岩、角闪岩、大理岩组成,原岩为双峰式火山岩、滨浅海相石英砂岩、长石石英砂岩夹粉砂岩、台地相的碳酸盐岩、发育少量基性岩墙,整体沉积环境类似于威尔逊旋回的幼年期:陆壳拉伸、地幔物质上涌、洋盆不断扩展,具有裂陷槽的特点。特克斯岩群莫合西萨依岩组为一套低-中级变质岩系,由变碎屑岩、石英岩、石英片岩、千枚状片岩、千枚岩和碳酸盐岩组成,原岩为滨浅海相石英砂岩、泥页岩和台地相灰岩、白云岩,整体沉积环境类似被动大陆边缘、威尔逊旋回的成年期:洋盆规模不断扩大,接受稳定的陆源碎屑岩沉积。晚古生代沉积地层包括中泥盆统汗吉尕组(D2h)、上泥盆统托斯库尔他乌组(D3t)、下石炭统大哈拉军山组(C1d)和阿克沙克组(C1a)。其中,泥盆系主要为一套浅海相陆源碎屑岩,含大量植物化石和少量动物化石,沉积环境稳定,无明显海侵、海退过程;下石炭统主要为一套浅海相陆源碎屑岩、酸性火山岩及同质火山碎屑岩,夹少量灰岩,沉积环境为活动大陆边缘(图 2)。

    图  2  温泉县别珍套山地质简图(据参考文献修改)
    Figure  2.  Simplified geological map for the Biezhentao Mountain of Wenquan County

    研究区出露的新元古代侵入岩类型单一,为片麻状-眼球状二长花岗岩,主要沿牙马特南山和伊力比斯提北侧一带分布,呈脉状、透镜体状分布,长轴近东西向,与温泉岩群变质岩系呈构造面理接触,后期被奥陶纪闪长岩类侵入。该类岩体数量较多,规模不一,规模较大者包括牙马特南山片麻状-条纹状二长花岗岩和伊力比斯提片麻状-眼球状二长花岗岩。前者沿牙马特南山主脊出露,东西长约24 km,南北宽0.5~2 km,局部被断层错断,与温泉岩群托克赛岩组和牙马特岩组呈断层或构造面理接触,岩体中含大量温泉岩群片岩和斜长角闪岩残留体(图 3-a);后者出露于伊力比斯提韧性剪切带以北,东西长约13 km,南北宽200~600 m,南侧与温泉岩群西伯提岩组呈糜棱面理接触,北侧被奥陶纪花岗闪长岩侵入(图 3-b)。

    图  3  新元古代片麻状-眼球状花岗岩野外特征剖面图
    a—托克赛附近岩体特征示意图;b—夏尔依西根附近岩体特征示意图
    Figure  3.  Simplified geological map for theBiezhentao Mountain of Wenquan County

    该类岩石类型相对简单,主要岩性为眼球状、条纹状黑云二长花岗片麻岩,受后期变质变形作用改造,呈明显的似层状近东西向展布。总体宏观特征为:①与温泉岩群变质岩系构造面理接触,片麻理产状与主期面理(Sn)一致;②岩性较稳定,横向上无明显变化,纵向具有明显的结构构造变化,一般情况下,从南到北从巨斑状变化为条纹状和条带状;③部分地段含少量角闪石和石榴子石;④岩石中含少量暗色细粒包体和细粒斜长角闪岩残留体,局部地段含大规模云母片岩夹石榴角闪岩残留体,多呈团块状、条带状沿片麻理展布;⑤岩层局部地段发育顺层不对称褶皱,褶皱面为片麻理,轴面近水平。

    岩石主要由钾长石、斜长石、石英、黑云母等组成,具典型的眼球状、条纹状和片麻状构造。眼球主要为钾长石,多呈粗大眼球状,少量为半自形短板状-他形粒状,粒径多为1~4 cm(长轴),可见明显的卡氏双晶,部分呈条纹状沿片麻理分布。变余基质中,斜长石和钾长石多呈半自形短板状-他形粒状,偶见蠕英石,碎裂化明显,粒径多小于3 mm,边缘细粒化,多具波状消光,定向分布,二者含量相当,共50%~60%。石英为他形粒状,粒径1~3 mm,细粒化明显,部分发生动态重结晶,具波状消光、变形纹,定向分布,含量20%~30%。黑云母呈片状,片径多小于2.0 mm,主要沿长石和石英旁侧不均匀定向分布,构成片麻状构造,含量5%~10%不等。根据镜下鉴定结果,综合判断该类片麻状-眼球状花岗岩的原岩可能为二长花岗岩和花岗闪长岩。

    样品均采自新鲜的岩体露头。岩石试样经锆石单矿物挑选、制备样品靶后,拍摄阴极发光(CL)、透射光图像和反射光图像,选取分析点位;用激光剥蚀等离子体质谱仪原位分析锆石微区的U-Pb比值(206Pb/238U、207Pb/235U和207Pb/206Pb)。锆石的CL图像分析在武汉上谱公司扫描电镜实验室完成。锆石的激光剥蚀电感耦合等离子体质谱(LA-ICP-MS)原位U-Pb定年在中国地质调查局西安地质调查中心完成。

    本次样品的主量、稀土及微量元素分析由西安地质调查中心完成。内检样品比例大于20%, 内检分析原始合格率为98%。符合相关质量规范要求。Sr-Nd的化学分析和同位素比值测量在中国科学院地质与地球物理研究所完成,测量仪器为德国Finnegan公司MAT 262热电离质谱计。

    锆石Hf同位素测试在中国地质科学院矿产资源研究所自然资源部成矿作用与资源评价重点实验室Neptune多接收等离子质谱和New wave UP213紫外激光剥蚀系统(LA-MC-ICP-MS)上进行,实验过程中采用氦气作为剥蚀物质载气,根据锆石大小,剥蚀直径采用55 μm,测定时使用锆石标样Gj-1和Plesovice为参考物质,分析点接近U-Pb定年分析点位置。相关仪器运行条件及详细分析流程见侯可军等[14]

    本次对区内3个眼球状片麻状-眼球状花岗岩采集了4件锆石测年样品开展年代学研究,测试结果见表 1

    表  1  新元古代片麻状花岗岩锆石U-Th-Pb年龄测试结果
    Table  1.  Zircon U-Th-Pb dating results of Neoproterozoic granitoids
    测点Pb
    (总量)
    232Th238UTh/U同位素比值同位素年龄/Ma谐和
    度/%
    /10-6207Pb/206Pb207Pb/235U206Pb/238U207Pb/206Pb207Pb/235U206Pb/238U
    PM16-2-TW1
    1122786880.110.06810.00171.5240.0390.16240.002487050940169701396.9
    21722539480.270.06660.00141.5040.0340.16380.002382644932149781395.3
    317815910660.150.06740.00141.4190.0310.15270.002284942897139161297.9
    4216138710261.350.06690.00141.3560.0300.14710.002183443870138851298.3
    51271576620.240.07260.00171.6700.0400.16680.00241003469971599513100.2
    650761932330.190.06910.00101.3750.0230.14440.0020901298791087011101.0
    747381029450.280.06930.00101.4090.0240.14750.0020908308931088711100.7
    823318013890.130.06710.00131.4190.0290.15350.002283939897129211297.4
    91601009480.110.06620.00151.4170.0330.15530.002281246896149311296.2
    1017318410400.180.06850.00151.4370.0320.15210.002288443904139131299.0
    1220461713160.470.07160.00141.3920.0300.14110.0020973408851385111104.0
    1318713511090.120.06640.00141.4250.0320.15560.002282044899139321296.5
    141391937490.260.06690.00161.5260.0380.16550.002483449941159871395.3
    15621203510.340.06750.00241.4320.0510.15400.002585372903219231497.8
    1618213511240.120.06730.00141.3910.0310.15000.002284642885139011298.2
    171361147950.140.06790.00151.4590.0350.15600.002386546914149341397.9
    1832719219850.100.06730.00111.4200.0260.15320.002184634897119191297.6
    19234113514360.790.06910.00131.4270.0280.14980.0021902379001290012100.0
    201491098720.130.06750.00141.4800.0330.15920.002385243922139521396.8
    PM18-61-TW1
    122234613370.260.06790.00141.4070.0320.15040.002386642892139031398.8
    220647411710.400.07250.00171.4990.0380.15020.0024999479301590213103.1
    332034418890.180.06960.00141.4980.0330.15610.002491841929149351399.4
    429333816940.200.06990.00151.5210.0360.15800.002492544939149451499.4
    527636914710.250.07210.00181.6520.0430.16640.002698749990179921599.8
    6598105032530.320.07170.00131.5880.0330.16090.0025977389661396214100.4
    723790713130.690.07440.00231.5930.0500.15560.00261051609682093214103.9
    824424014080.170.07030.00181.5460.0420.15960.002593752949179551499.4
    9836212843860.490.08450.00161.7700.0370.15200.002313053510351391213113.5
    1039651121180.240.07370.00191.6770.0460.16510.002610345110001798515101.5
    1139269123480.290.07130.00151.4670.0350.14940.0023966439171489813102.1
    1219534410400.330.07690.00221.7240.0510.16280.002711185610181997215104.7
    1322144212310.360.07070.00191.5180.0420.15580.0025949539381793414100.4
    1429641316190.260.06960.00151.5700.0370.16370.002591744958159771498.1
    1519521210650.200.07160.00191.6560.0460.16780.0027975539921810001599.2
    1628452215940.330.07280.00161.5730.0380.15680.00241010449601593914102.2
    1719133110640.310.06830.00191.4810.0430.15730.002787755923189421598.0
    1841654423990.230.07010.00141.5060.0340.15570.0026931409331493314100.0
    1919437610910.340.06890.00201.4740.0450.15510.002789659920199301598.9
    2029646016560.280.06880.00171.4960.0400.15760.002789351929169441598.4
    2131450316210.310.07700.00201.7810.0500.16770.002911215210391899916104.0
    2224436813290.280.06940.00191.5620.0460.16320.002891156955189741698.0
    2323136712170.300.06890.00191.5870.0470.16710.002989557965199961696.9
    2426948514340.340.06840.00181.5450.0440.16370.002888255949189771697.1
    2519420910630.200.06940.00211.5850.0490.16560.002991060964199881697.6
    PM11-30-TW1
    120938011790.320.07140.00151.4330.0320.14550.0021969429031387612103.1
    218629010810.270.06890.00151.3520.0310.14240.0020896458691385811101.3
    457973020.320.06840.00281.4510.0590.15400.002687982910249231498.6
    51202586090.420.06850.00201.4760.0450.15630.002488460921189361398.4
    6891954710.410.07020.00251.4300.0500.14780.0023933709022188913101.5
    8621433210.440.08270.00341.6620.0670.14580.00251262789942687714113.3
    91352676930.390.06900.00191.5060.0430.15820.002490057933189471398.5
    10531232660.460.07490.00321.5910.0680.15410.00271066849672692415104.7
    11351201810.670.06640.00391.3450.0770.14700.0028818117865348841697.9
    12521392740.510.07120.00311.4540.0630.14810.0026963869112689014102.4
    13971875000.370.07010.00221.5060.0470.15590.002493162933199341399.9
    14381141910.600.06930.00351.4470.0730.15160.0028907101909309101599.9
    151082235510.400.06790.00201.4570.0430.15570.002386659913189331397.9
    16661693540.480.07040.00251.3920.0500.14350.0023939718852186413102.4
    17561112810.390.06990.00261.5360.0570.15950.002692475945239541499.1
    18812024140.490.07000.00221.4550.0460.15070.0023929639121990513100.8
    19661613400.470.06730.00241.4120.0500.15220.002484871894219131397.9
    21411132110.540.07180.00321.4550.0630.14710.0025979879122688514103.1
    22801903990.480.06910.00231.4790.0500.15540.002490167922209311399.0
    PM16-11-TW3
    1721863950.470.0630.00331.3370.0700.15410.0029708108862319241693.3
    21545348070.660.07150.00221.5350.0480.15580.0026970619441993414101.1
    31102736050.450.07130.00261.5370.0560.15650.0027965729452393715100.9
    4961855160.360.06950.00271.5490.0610.16160.002991478950249661698.3
    51232587120.360.07060.00251.4640.0530.15040.0026947719162290315101.4
    6691663750.440.07230.00381.5550.0820.1560.00329951049523293418101.9
    735731750.420.07470.00571.6870.1260.16390.004106014610044897822102.7
    8401232180.570.06980.0051.4720.1040.15310.00359221409194391820100.1
    9561543190.480.06840.00421.3630.0830.14470.00318801238733687117100.2
    10782074180.490.06960.00331.5060.0700.1570.00391793933299401799.3
    11971635430.30.07120.00281.5240.0600.15530.0028963789402493115101.0
    12471342720.490.06860.00331.3820.0660.14620.0028885968812888016100.1
    1320754412160.450.06890.00161.3820.0350.14540.0023897478811587513100.7
    15882294930.460.0720.00251.4960.0530.15070.0026985709292290515102.7
    16591543320.460.06450.00331.3350.0670.15010.0028758103861299021695.5
    17611023790.270.06870.0031.3800.0610.14560.0027890888802687615100.5
    181192127170.290.06940.00221.3970.0460.14610.0025909658881987914101.0
    19451182500.470.07110.00371.5080.0770.15380.00319601029343192217101.3
    20611513360.450.07030.00311.4800.0650.15270.0028937889222791616100.7
    注:谐和度=100×(207Pb/235U年龄)/(206Pb/238U年龄)
    下载: 导出CSV 
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    PM16-18-TW2:岩性为片麻状花岗岩,锆石晶形较完好,存在颗粒破碎的锆石晶体,多为长柱状,长宽比介于1:1~3:1之间,呈浑圆状,根据锆石晶体阴极发光图,锆石由核、边结构组成,核、边均发育岩浆成因的韵律环带,环带清晰,应为岩浆锆石(图 4)。本次在该样品中选取20个点进行年龄测试,测试结果见表 1,Th含量为73×10-6~544×10-6,U为175×10-6~1216×10-6,Th/U值为0.27~0.66,应为岩浆锆石。由锆石年龄谐和图(图 5)可知,其206Pb/238U年龄集中在871~978 Ma之间,206Pb/238U年龄加权平均值为911±13 Ma(n=20),代表了片麻状花岗岩形成年龄。

    图  4  锆石阴极发光(CL)图像、U-Pb年龄分析点(实线圈)及Lu-Hf同位素分析点(虚线圈)和206Pb/238U年龄
    Figure  4.  CL images, analytical points for U-Pb(solid circles), analytical points for Lu-Hf isotope(dashed circles)and 206Pb/238U ages of zircons
    图  5  花岗岩锆石U-Pb谐和图和206Pb/238U年龄加权平均值图
    Figure  5.  U-Pb concordia diagrams and weighted average 206Pb/238U ages of zircons for the granitic gneiss

    PM16-2-TW1:岩性为片麻状花岗岩,锆石晶形较完好,存在颗粒破碎的锆石晶体,多为长柱状,长宽比介于1:5~3:1之间,呈浑圆状,根据锆石晶体阴极发光图,锆石由核、边结构组成,核、边均发育岩浆成因的韵律环带,环带清晰,应为岩浆锆石(图 4)。本次在该样品中选取了19个点进行年龄测试,测试结果见表 1,Th含量为78×10-6~1387×10-6,U为351×10-6~3233×10-6,Th/U值为0.10~1.35,应为岩浆锆石。锆石206Pb/238U年龄集中在851~995 Ma之间(图 5),206Pb/238U年龄加权平均值为920±19 Ma(n=19),代表了片麻状花岗岩形成年龄。

    PM18-61-TW1:岩性为片麻状花岗岩,锆石晶形较完好,存在颗粒破碎的锆石晶体,多为短柱状,长宽比介于1:1~2.5:1之间,呈浑圆状,根据锆石晶体阴极发光图,锆石由核、边结构组成,核、边均发育岩浆成因的韵律环带,环带清晰,应为岩浆锆石(图 4)。本次在该样品中选取25个点进行年龄测试,测试结果见表 1,Th的变化范围为209×10-6~2128×10-6,U的变化范围为1040×10-6~4386×10-6,Th/U值为0.17~0.69,应为岩浆锆石。锆石206Pb/238U年龄集中在898~1000 Ma之间(图 5),206Pb/238U年龄加权平均值为950±13 Ma(n=25),代表了片麻状花岗岩形成年龄。

    PM11-30-TW1:岩性为片麻状花岗岩,锆石晶形较完好,存在颗粒破碎的锆石晶体,多为短柱状,长宽比为1:1~3:1,呈浑圆状,根据锆石晶体阴极发光图,锆石由核、边结构组成,核、边均发育岩浆成因的韵律环带,环带清晰,应为岩浆锆石(图 4)。本次在该样品中选取了19个点进行年龄测试,测试结果见表 1。Th含量为97×10-6~380×10-6,U含量为181×10-6~1179×10-6,Th/U值为0.27~0.67,应为岩浆锆石。由锆石年龄谐和图(图 5)可知,其206Pb/238U年龄集中在858~954 Ma之间,206Pb/238U年龄加权平均值为906±14 Ma(n=19),代表了片麻状花岗岩形成年龄。

    综上所述,4件样品的锆石Th/U值为0.10~1.35, 大于0.1(仅1个为0.10), 表明锆石为岩浆成因。呈棱柱状自形晶,晶形较大,大多大于100 μm,发育明显的振荡环带(图 4)。对每件样品测试了19~25个点,年龄值一致,大多集中在910~950 Ma,与前人的研究结果一致(表 1)。极少量继承锆石的年龄大于1000 Ma。因此,910~950 Ma能代表该类花岗岩的形成时代(图 5)。

    本次在研究区4个岩体的不同部位分别采集了16件样品进行岩石地球化学分析,分析结果见表 2表 3表 4

    表  2  新元古代早期片麻状-眼球状花岗岩主量元素分析结果
    Table  2.  Abundances of major elements of Neoproterozoic granitoids %
    样号岩性SiO2Al2O3Fe2O3FeOCaOMgOK2ONa2OTiO2P2O5MnO烧失量H2O+CO2总量Na2O+K2OA/CNKA/NK
    PM11-30-HQ1片麻状-眼球
    状花岗岩
    66.1813.262.115.352.770.515.3120.790.190.121.210.540.096100.447.310.941.47
    PM11-30-HQ269.0412.962.033.751.980.445.432.190.610.140.11.170.680.032100.557.620.991.37
    PM11-30-HQ369.5313.271.283.521.470.455.942.260.550.130.091.320.560.033100.48.21.031.31
    PM11-30-HQ469.9612.851.73.421.640.555.582.310.60.130.080.990.580.082100.477.891.001.31
    PM11-42-HQ167.8713.991.254.52.280.864.232.940.730.230.090.840.240.012100.067.171.031.49
    PM11-42-HQ269.1613.881.453.482.040.624.582.850.540.180.080.950.44< 0.01100.257.431.041.44
    PM16-2-HQ173.6912.451.061.741.640.625.062.210.390.110.040.80.320.13100.267.271.031.37
    PM16-2-HQ469.5513.321.662.51.950.495.852.650.550.130.061.120.340.362100.538.50.941.25
    PM16-11-HQ1糜棱岩化眼
    球状花岗岩
    70.2814.211.012.081.861.044.073.410.480.10.041.250.550.33100.717.481.061.42
    PM16-11-HQ370.1514.70.992.652.190.712.754.020.450.120.060.980.40.094100.266.771.081.53
    PM16-18-HQ2片麻状-眼球
    状花岗岩
    66.1313.52.014.82.690.595.472.080.790.190.121.430.480.407100.697.550.951.44
    PM16-101-HQ268.3513.911.473.421.841.583.373.10.690.170.071.83<0.010.276100.086.471.151.59
    PM16-101-HQ367.8314.371.672.921.851.394.942.450.630.150.071.520.960.078100.837.391.131.53
    PM18-61-YQ1糜棱岩化眼
    球状花岗岩
    71.3513.740.81.421.310.766.682.180.320.10.041.10.720.081100.68.861.041.27
    PM18-61-YQ267.514.361.832.482.421.344.332.780.590.140.061.971.320.033101.157.111.051.55
    PM18-61-YQ368.5113.921.762.721.681.543.932.910.620.140.0621.480.117101.396.841.151.54
    下载: 导出CSV 
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    表  3  新元古代早期片麻状-眼球状花岗岩稀土元素分析结果
    Table  3.  Abundances of rare earth elements of Neoproterozoic granitoids 10-6
    样号岩性LaCePrNdSmEuGdTbDyHoErTmYbLuYΣREELREEHREELREE/
    HREE
    LaN/
    YbN
    δEu
    PM11-30-HQ1片麻状-眼球
    状花岗岩
    12425929.611322.54.2724.33.8824.2513.72.1313.82.02122641.40552.3789.036.206.450.55
    PM11-30-HQ215231934.912824.83.3125.44.0125.35.3815.22.2814.52.16136756.24662.0194.237.037.520.40
    PM11-30-HQ31362743110820.13.0620.33.1219.2411.51.7110.81.7103644.49572.1672.337.919.030.46
    PM11-30-HQ416032135.212723.53.0924.34.0123.84.9914.12.0612.71.95123757.70669.7987.917.629.040.39
    PM11-42-HQ192.61942280.515.72.5416.12.414.22.87.691.176.921.0572.5459.67407.3452.337.789.600.48
    PM11-42-HQ286.417118.965.212.72.5313.32.112.82.637.171.116.911.0665403.81356.7347.087.588.970.59
    PM16-2-HQ149.810611.843.58.841.278.171.267.261.454.060.634.060.6237.4248.72221.2127.518.048.800.45
    PM16-2-HQ411220624.289.216.21.8116.52.6615.93.39.361.459.311.3882.8509.27449.4159.867.518.630.34
    PM16-11-HQ1糜棱岩化眼
    球状花岗岩
    73.21361551.28.891.078.121.257.281.484.280.634.280.6242.2313.30285.3627.9410.2112.270.38
    PM16-11-HQ362.111412.844.77.680.836.40.94.70.882.410.362.320.3525.9260.43242.1118.3213.2219.200.35
    PM16-18-HQ2片麻状-眼球
    状花岗岩
    10120925.198203.6619.93.12183.69.871.529.861.5291.6524.15456.7667.396.787.350.55
    PM16-101-HQ269.113115.555.79.951.339.221.277.161.440.623.960.6139.9310.82282.5828.2410.0112.520.42
    PM16-101-HQ351.610111.742.68.231.167.61.156.811.363.780.583.710.5737241.85216.2925.568.469.980.44
    PM18-61-YQ1糜棱岩化眼
    球状花岗岩
    4792.410.638.47.381.286.771.066.321.243.520.533.490.5234.7220.51197.0623.458.409.660.54
    PM18-61-YQ257.811212.545.38.521.427.771.237.171.454.020.613.920.639.6264.31237.5426.778.8710.580.52
    PM18-61-YQ371.314416.157.610.51.289.421.47.971.554.160.613.960.5941.6330.44300.7829.6610.1412.920.39
    下载: 导出CSV 
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    表  4  新元古代早期片麻状-眼球状花岗岩微量元素分析结果
    Table  4.  Abundances of trace elements of Neoproterozoic granitoids 10-6
    样号岩性PbCrNiCoRbCsSrBaVNbTaZrHfGeUTh
    PM11-30-HQ1片麻状-眼球
    状花岗岩
    373.813.423.561622.7215314101573.25.02111027.71.753.7328.5
    PM11-30-HQ241.22.732.072.71801.56126108010.862.44.3881621.51.794.3643.8
    PM11-30-HQ343.53.452.252.952042.0215612001253.83.7877120.31.53.7238.2
    PM11-30-HQ439.63.43.33.132172.82142101013.358.54.1885422.91.544.5547.7
    PM11-42-HQ126.520.18.175.392269.9714264738.333.72.259616.31.823.750.9
    PM11-42-HQ229.37.024.433.072357.9513366126.427.51.8849113.91.81550.5
    PM16-2-HQ14211.45.634.062044.718572928.310.70.672758.061.451.9422.6
    PM16-2-HQ437.74.392.763.712283.2490.368018.743.42.9161016.31.843.433.4
    PM16-11-HQ1糜棱岩化眼
    球状花岗岩
    53166.666.331903.3828889034.2141.362396.641.224.1231.2
    PM16-11-HQ331.27.543.824.72115.7520638327.119.61.522646.971.474.9231.1
    PM16-18-HQ2片麻状-眼球
    状花岗岩
    38.84.613.024.441993.13180137019.465.14.25114026.41.663.2618
    PM16-101-HQ225.822.38.989.042029.0118553457.215.81.32788.121.523.0932
    PM16-101-HQ348.319.57.948.432418.0115276952.814.81.162487.361.433.4225.9
    PM18-61-YQ1糜棱岩化眼
    球状花岗岩
    54.611.25.494.12892.8913093622.67.680.681715.421.664.0532.4
    PM18-61-YQ241.824.18.488.522112.7711383651.413.51.12467.121.643.7429.7
    PM18-61-YQ336.922.48.69.422093.311267325114.51.22517.361.423.9637.8
    下载: 导出CSV 
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    (1) 主量元素

    从分析结果看,16件样品的主量元素具有高硅(≥70%)、富碱(K2O+Na2O,6.5%~8.9%)且K2O>Na2O的特征,在SiO2-K2O岩石系列判别图解中,绝大多数样品均落在高钾钙碱性和钾玄岩系列,仅1个样品为钙碱性,且样品表现出从钙碱性到钾玄岩演化的变化趋势(图 6)。在铝质判别图中,牙马特南山一带的片麻状-眼球状花岗岩样品属于准铝质-过铝质花岗岩,A/CNK值为0.94~1.08;伊力比斯提一带的片麻状-眼球状花岗岩则为过铝质花岗岩,A/CNK值为1.04~1.15。表明两地的片麻状-眼球状花岗岩在岩石成因上有一定差别,后者主要与地壳物质重熔有关,而前者可能有更多火成岩重熔形成的岩浆参与。

    图  6  SiO2-K2O图解(a)和铝质判别图解(b)
    Figure  6.  The K2O versus SiO2 diagram(a) and Shand's index Al/(Na + K) versus Al/(Ca + Na + K)plots(b)

    (2) 稀土和微量元素

    在稀土元素配分曲线中,所有样品的曲线形态相近,整体为右倾,LREE/HREE值介于6.2~13.22之间,LaN/YbN值介于6.45~19.2之间。具明显的负Eu异常,δEu值介于0.34~0.59之间,配分曲线表现出近似“V”型曲线(图 7-a),与碱性花岗岩相似。

    图  7  稀土元素配分曲线(a)和微量元素蛛网图(b)
    Figure  7.  Chondrite-normalized REE patterns(a)and multi-element variation diagrams(b)

    在微量元素蛛网图中,16件样品的特征一致,富集Rb、Th、U、K等元素,贫Ba、Nb、Ta、Sr、P、Ti等元素,显示活动大陆边缘岩石特征(图 7-b)。

    (1) 全岩Sr-Nd同位素特征

    在岩石地球化学分析基础上,本次选择了9件样品进行全岩Sr-Nd同位素示踪,分析结果见表 5

    表  5  新元古代片麻状花岗岩Sr-Nd同位素测试结果
    Table  5.  Abundances of Sr-Nd of Neoproterozoic granitoids
    样号PM11-30
    -HQ1
    PM11-30
    -HQ2
    PM16-2
    -HQ1
    PM16-2
    -HQ4
    PM11-42
    -HQ1
    PM11-42
    -HQ2
    PM16-101
    -HQ2
    PM16-101
    -HQ3
    PM18-61
    -YQ3
    87Rb/86Sr2.9230553.3898362.7733186.5287004.0653004.5727002.7965004.0239004.511800
    87Sr/86Sr0.7550710.7619950.7456290.7876130.7558980.7642900.7459110.7649200.766481
    0.0000150.0000150.0000130.0000170.0000160.0000150.0000110.0000210.000017
    ISr0.7172230.7181020.7091610.7017630.7024400.7041600.7086950.7113700.705204
    147Sm/144Nd0.1223630.1171790.1225890.1131000.1212000.1163000.1129000.1174000.113800
    143Nd/144Nd0.5121400.5121200.5120340.5120430.5121830.5121350.5119070.5118840.511856
    0.0000080.0000080.0000110.0000100.0000070.0000100.0000110.0000100.000006
    锆石年龄/
    Ma
    906906920920920920931931950
    εNd(0)-9.71-10.10-11.79-11.61-8.88-9.81-14.26-14.71-15.25
    εNd(t)-1.10-0.88-3.07-1.770.01-0.35-4.29-5.27-5.19
    fSm/Nd-0.38-0.40-0.38-0.43-0.38-0.41-0.43-0.40-0.42
    tDM1/Ma168516261866167715941588187720011971
    tDM2/Ma165016321820171515711600192820072016
    下载: 导出CSV 
    | 显示表格

    从分析结果看,样品的初始87Sr/86Sr值较分散,其中2件样品的初始87Sr/86Sr值小于0.704,主要由于样品本身具有较高的87Rb/86Sr值,导致初始87Sr/86Sr值存在很大误差而不可信;另有3件样品的初始87Sr/86Sr值大于0.712。Nd同位素的组成整体较集中,绝大多数样品的εNd(t)值均小于0,仅1个样品为0.01,变化于-5.27~0.01之间,平均值为-2.43,与胡霭琴等[2]的测试结果一致。在(87Rb/86Sr)i-εNd(t)相关图(图 8-a)中,所有样品点的锶钕同位素呈近水平相关性,即初始87Sr/86Sr值很分散,而εNd(t)值变化范围较小,具典型壳源花岗岩(S型花岗岩)的特征。所有样品的fSm/Nd值介于-0.37~-0.42之间,表明Nd同位素的测试结果可靠,第一阶段tDM1和第二阶段tDM2模式年龄一致,很好地印证了这一点(表 5)。所有样品的tDM1模式年龄介于1588~2001 Ma之间,远大于岩体形成年龄。

    图  8  (87Sr/86Sr)iNd(t)(a)和锆石年龄-εHf(t)关系图(b)
    MORB—洋中脊玄武岩;OIB—洋岛玄武岩;DM—亏损地幔;CHUR—球粒陨石均一库
    Figure  8.  Diagrams of (87Sr/86Sr)iNd(t)(a)and age-εHf(t)(b)for the granitic gneiss

    (2) 锆石Lu-Hf同位素特征

    本次对3件样品共30颗锆石测试了Lu-Hf同位素,其中3颗锆石的测试结果误差较大,予以剔除,剩余27个点的测试结果见表 6。绝大多数锆石的176Lu/177Hf值小于0.002,仅2颗锆石大于0.002,显示锆石形成后具有较低的放射性成因Hf的积累。样品176Hf/177Hf值介于0.282285~0.282644之间,根据锆石U-Pb(206Pb/238U)同位素年龄(858~1080 Ma)计算获得εHf(t)值为3.64~13.59。单阶段Hf模式年龄(tDM1)为883~51351 Ma,平均为1133 Ma;二阶段Hf模式年龄(tDM2)为891~1588 Ma,平均为1250 Ma,与锆石形成年龄较接近。在εHf(t)-年龄图解上,所有数据点均落于亏损地幔线与球粒陨石线之间,靠近亏损地幔线一侧(图 8-b)。

    表  6  新元古代片麻状花岗岩锆石Lu-Hf同位素测试结果
    Table  6.  Abundances of Lu-Hf of zircons for the Neoproterozoic granitoids
    测点176Yb/177Hf176Lu/177Hf176Hf/177HfU年龄/MaεHf(0)εHftDM1/MatDM2/MatcDM/MafLu/Hf
    PM16-101-TW3
    10.0782670.0017280.2825190.000022934-8.9510.620.77989105911291135-0.95
    20.0295760.0006100.2822860.000022960-17.193.640.75455135115881603-0.98
    30.0532450.0011140.2823900.0000211005-13.507.990.74790122213501360-0.97
    40.0593850.0012840.2824260.0000231080-12.2310.760.79838117712331239-0.96
    50.0618040.0013980.2824320.000023895-12.046.900.82005117313331344-0.96
    60.0496620.0011640.2823760.000019942-14.016.080.66361124414211433-0.96
    70.0573770.0012720.2824480.0000241003-11.479.880.82656114612291236-0.96
    80.0487730.0011240.2823970.000020911-13.276.170.68598121413911403-0.97
    90.0565920.0012970.2824250.000021965-12.298.210.72471118013041314-0.96
    100.0521200.0011920.2823930.000020930-13.396.430.69463122013901401-0.96
    PM11-30-TW1
    10.0395810.0008610.2825030.000023876-9.519.350.78829105611641172-0.97
    20.0653580.0014410.2825090.000025858-9.298.840.87680106411821191-0.96
    40.0248600.0005310.2823890.000025923-13.546.540.88984120513781389-0.98
    50.0417210.0008890.2824370.000025936-11.858.300.86826115012771286-0.97
    60.0365870.0007910.2824280.000029889-12.186.991.02444116013231333-0.98
    80.0344720.0007400.2823610.000028877-14.534.420.97299125114761489-0.98
    90.0380830.0008200.2824130.000025947-12.687.730.88871118113211331-0.98
    100.0298210.0006560.2823510.000028924-14.905.110.99569126314681481-0.98
    PM16-2-TW1
    10.0711210.0015910.2824750.000023970-10.499.950.81897111711991207-0.95
    20.0787920.0017210.2825390.000022978-8.2412.270.77492103010591063-0.95
    30.0825490.0018160.2824960.000021916-9.759.400.72463109311921200-0.95
    50.0648210.0014270.2824900.000022995-9.9611.100.75681109111461151-0.96
    60.0998520.0019170.2826440.000026870-4.5313.590.89546883891894-0.94
    70.1049050.0021590.2826010.000024887-6.0612.270.85205952988992-0.93
    80.1031840.0022040.2825680.000026921-7.2211.780.92709100110451050-0.93
    90.0736350.0016360.2825030.000026931-9.5210.050.89375107911621169-0.95
    100.0804790.0017280.2825350.000027913-8.3910.740.94546103611051111-0.95
    注:PM16-101-TW3锆石Lu-Hf同位素数据据参考文献
    下载: 导出CSV 
    | 显示表格

    从岩石地球化学分析结果看,新元古代片麻状花岗岩具有典型的大陆地壳岩石的元素地球化学特征,与A2型花岗岩[15]类似。岩石的Nd模式年龄为1588~2001 Ma,εNd(t)值变化于-5.27~0.01之间,锶钕同位素具水平相关性,为壳源花岗岩特征。胡霭琴等[2]获得温泉岩群斜长角闪岩类的εNd(940 Ma)值为0.9~3.2,与新元古代片麻状花岗岩的结果明显不同,表明这些花岗岩不可能由角闪岩类部分熔融形成,其源区可能为成熟度很高的陆壳碎屑物质,是由古元古代温泉岩群基底硅铝质的重熔改造形成的。

    R1-R2构造环境判别图中,所有样品点均落在同碰撞区(图 9-a),在Rb/30- Hf-3Ta判别图(图 9-b)中,样品表现为从板内到火山弧再到碰撞环境的逐渐演变趋势。综合各种数据和判别图解,调查区的新元古代早期片麻状花岗岩主要形成于活动大陆边缘,与洋陆俯冲具有密切关系。

    图  9  新元古代片麻状花岗岩R1-R2(a)和Rb/30-Hf-3Ta(b)构造环境判别图
    Figure  9.  Tectonic implications for granite R1-R2(a)and Rb/30-Hf-3Ta(b) diagrams

    在东天山星星峡地区、中天山巴仑台地区、西天山赛里木湖地区与塔里木北缘均发育新元古代Rodinia超大陆裂解有关的岩石记录[16-19],一些学者提出塔里木板块曾经是Rodinia超大陆的一部分[12-13, 20-28], 因此天山地区前寒武纪陆壳块体(包括伊犁地块)很可能也是Rodinia超大陆在新元古代中—晚期裂解过程中分离、散落在古亚洲洋中的大陆碎块。温泉岩群中新元古代早期(约9 Ga)的混合岩和片麻状花岗岩则可能是与Rodinia超大陆会聚有关的格林维尔期造山作用、地壳增厚导致地壳物质部分熔融的产物。

    (1) 本次对温泉县3个眼球状片麻状-眼球状花岗岩采集的4件锆石测年样品开展年代学研究,其中206Pb/238U年龄值一致,大多集中在910~950 Ma之间,与前人的研究结果一致。因此,910~950 Ma能代表该类花岗岩的形成时代。

    (2) 岩体具有高硅(≥70%)、富碱(K2O+Na2O,6.5%~8.9%)且K2O>Na2O的特征,表现出从钙碱性到钾玄岩演化的变化趋势。稀土元素特征与碱性花岗岩相似。微量元素富集Rb、Th、U、K等,贫Ba、Nb、Ta、Sr、P、Ti等,显示活动大陆边缘岩石特征。全岩Sr-Nd同位素特征表明具典型壳源花岗岩(S型花岗岩)的特征。Lu-Hf同位素特征表明单阶段Hf模式年龄(tDM1)为883~1351 Ma,平均为1133 Ma;二阶段Hf模式年龄(tDM2)为891~1588 Ma,平均为1250 Ma,与锆石形成年龄比较接近。

    (3) 温泉岩群中新元古代早期(约9 Ga)的混合岩和片麻状花岗岩可能是与Rodinia超大陆会聚有关的格林维尔期造山作用、地壳增厚导致地壳物质部分熔融的产物。

  • 图  1   西天山温泉地区侵入岩分布简图(据参考文献修改)

    Figure  1.   Simplified intrusive rock map of the Wenquan area in West Tianshan

    图  2   温泉县别珍套山地质简图(据参考文献修改)

    Figure  2.   Simplified geological map for the Biezhentao Mountain of Wenquan County

    图  3   新元古代片麻状-眼球状花岗岩野外特征剖面图

    a—托克赛附近岩体特征示意图;b—夏尔依西根附近岩体特征示意图

    Figure  3.   Simplified geological map for theBiezhentao Mountain of Wenquan County

    图  4   锆石阴极发光(CL)图像、U-Pb年龄分析点(实线圈)及Lu-Hf同位素分析点(虚线圈)和206Pb/238U年龄

    Figure  4.   CL images, analytical points for U-Pb(solid circles), analytical points for Lu-Hf isotope(dashed circles)and 206Pb/238U ages of zircons

    图  5   花岗岩锆石U-Pb谐和图和206Pb/238U年龄加权平均值图

    Figure  5.   U-Pb concordia diagrams and weighted average 206Pb/238U ages of zircons for the granitic gneiss

    图  6   SiO2-K2O图解(a)和铝质判别图解(b)

    Figure  6.   The K2O versus SiO2 diagram(a) and Shand's index Al/(Na + K) versus Al/(Ca + Na + K)plots(b)

    图  7   稀土元素配分曲线(a)和微量元素蛛网图(b)

    Figure  7.   Chondrite-normalized REE patterns(a)and multi-element variation diagrams(b)

    图  8   (87Sr/86Sr)iNd(t)(a)和锆石年龄-εHf(t)关系图(b)

    MORB—洋中脊玄武岩;OIB—洋岛玄武岩;DM—亏损地幔;CHUR—球粒陨石均一库

    Figure  8.   Diagrams of (87Sr/86Sr)iNd(t)(a)and age-εHf(t)(b)for the granitic gneiss

    图  9   新元古代片麻状花岗岩R1-R2(a)和Rb/30-Hf-3Ta(b)构造环境判别图

    Figure  9.   Tectonic implications for granite R1-R2(a)and Rb/30-Hf-3Ta(b) diagrams

    表  1   新元古代片麻状花岗岩锆石U-Th-Pb年龄测试结果

    Table  1   Zircon U-Th-Pb dating results of Neoproterozoic granitoids

    测点Pb
    (总量)
    232Th238UTh/U同位素比值同位素年龄/Ma谐和
    度/%
    /10-6207Pb/206Pb207Pb/235U206Pb/238U207Pb/206Pb207Pb/235U206Pb/238U
    PM16-2-TW1
    1122786880.110.06810.00171.5240.0390.16240.002487050940169701396.9
    21722539480.270.06660.00141.5040.0340.16380.002382644932149781395.3
    317815910660.150.06740.00141.4190.0310.15270.002284942897139161297.9
    4216138710261.350.06690.00141.3560.0300.14710.002183443870138851298.3
    51271576620.240.07260.00171.6700.0400.16680.00241003469971599513100.2
    650761932330.190.06910.00101.3750.0230.14440.0020901298791087011101.0
    747381029450.280.06930.00101.4090.0240.14750.0020908308931088711100.7
    823318013890.130.06710.00131.4190.0290.15350.002283939897129211297.4
    91601009480.110.06620.00151.4170.0330.15530.002281246896149311296.2
    1017318410400.180.06850.00151.4370.0320.15210.002288443904139131299.0
    1220461713160.470.07160.00141.3920.0300.14110.0020973408851385111104.0
    1318713511090.120.06640.00141.4250.0320.15560.002282044899139321296.5
    141391937490.260.06690.00161.5260.0380.16550.002483449941159871395.3
    15621203510.340.06750.00241.4320.0510.15400.002585372903219231497.8
    1618213511240.120.06730.00141.3910.0310.15000.002284642885139011298.2
    171361147950.140.06790.00151.4590.0350.15600.002386546914149341397.9
    1832719219850.100.06730.00111.4200.0260.15320.002184634897119191297.6
    19234113514360.790.06910.00131.4270.0280.14980.0021902379001290012100.0
    201491098720.130.06750.00141.4800.0330.15920.002385243922139521396.8
    PM18-61-TW1
    122234613370.260.06790.00141.4070.0320.15040.002386642892139031398.8
    220647411710.400.07250.00171.4990.0380.15020.0024999479301590213103.1
    332034418890.180.06960.00141.4980.0330.15610.002491841929149351399.4
    429333816940.200.06990.00151.5210.0360.15800.002492544939149451499.4
    527636914710.250.07210.00181.6520.0430.16640.002698749990179921599.8
    6598105032530.320.07170.00131.5880.0330.16090.0025977389661396214100.4
    723790713130.690.07440.00231.5930.0500.15560.00261051609682093214103.9
    824424014080.170.07030.00181.5460.0420.15960.002593752949179551499.4
    9836212843860.490.08450.00161.7700.0370.15200.002313053510351391213113.5
    1039651121180.240.07370.00191.6770.0460.16510.002610345110001798515101.5
    1139269123480.290.07130.00151.4670.0350.14940.0023966439171489813102.1
    1219534410400.330.07690.00221.7240.0510.16280.002711185610181997215104.7
    1322144212310.360.07070.00191.5180.0420.15580.0025949539381793414100.4
    1429641316190.260.06960.00151.5700.0370.16370.002591744958159771498.1
    1519521210650.200.07160.00191.6560.0460.16780.0027975539921810001599.2
    1628452215940.330.07280.00161.5730.0380.15680.00241010449601593914102.2
    1719133110640.310.06830.00191.4810.0430.15730.002787755923189421598.0
    1841654423990.230.07010.00141.5060.0340.15570.0026931409331493314100.0
    1919437610910.340.06890.00201.4740.0450.15510.002789659920199301598.9
    2029646016560.280.06880.00171.4960.0400.15760.002789351929169441598.4
    2131450316210.310.07700.00201.7810.0500.16770.002911215210391899916104.0
    2224436813290.280.06940.00191.5620.0460.16320.002891156955189741698.0
    2323136712170.300.06890.00191.5870.0470.16710.002989557965199961696.9
    2426948514340.340.06840.00181.5450.0440.16370.002888255949189771697.1
    2519420910630.200.06940.00211.5850.0490.16560.002991060964199881697.6
    PM11-30-TW1
    120938011790.320.07140.00151.4330.0320.14550.0021969429031387612103.1
    218629010810.270.06890.00151.3520.0310.14240.0020896458691385811101.3
    457973020.320.06840.00281.4510.0590.15400.002687982910249231498.6
    51202586090.420.06850.00201.4760.0450.15630.002488460921189361398.4
    6891954710.410.07020.00251.4300.0500.14780.0023933709022188913101.5
    8621433210.440.08270.00341.6620.0670.14580.00251262789942687714113.3
    91352676930.390.06900.00191.5060.0430.15820.002490057933189471398.5
    10531232660.460.07490.00321.5910.0680.15410.00271066849672692415104.7
    11351201810.670.06640.00391.3450.0770.14700.0028818117865348841697.9
    12521392740.510.07120.00311.4540.0630.14810.0026963869112689014102.4
    13971875000.370.07010.00221.5060.0470.15590.002493162933199341399.9
    14381141910.600.06930.00351.4470.0730.15160.0028907101909309101599.9
    151082235510.400.06790.00201.4570.0430.15570.002386659913189331397.9
    16661693540.480.07040.00251.3920.0500.14350.0023939718852186413102.4
    17561112810.390.06990.00261.5360.0570.15950.002692475945239541499.1
    18812024140.490.07000.00221.4550.0460.15070.0023929639121990513100.8
    19661613400.470.06730.00241.4120.0500.15220.002484871894219131397.9
    21411132110.540.07180.00321.4550.0630.14710.0025979879122688514103.1
    22801903990.480.06910.00231.4790.0500.15540.002490167922209311399.0
    PM16-11-TW3
    1721863950.470.0630.00331.3370.0700.15410.0029708108862319241693.3
    21545348070.660.07150.00221.5350.0480.15580.0026970619441993414101.1
    31102736050.450.07130.00261.5370.0560.15650.0027965729452393715100.9
    4961855160.360.06950.00271.5490.0610.16160.002991478950249661698.3
    51232587120.360.07060.00251.4640.0530.15040.0026947719162290315101.4
    6691663750.440.07230.00381.5550.0820.1560.00329951049523293418101.9
    735731750.420.07470.00571.6870.1260.16390.004106014610044897822102.7
    8401232180.570.06980.0051.4720.1040.15310.00359221409194391820100.1
    9561543190.480.06840.00421.3630.0830.14470.00318801238733687117100.2
    10782074180.490.06960.00331.5060.0700.1570.00391793933299401799.3
    11971635430.30.07120.00281.5240.0600.15530.0028963789402493115101.0
    12471342720.490.06860.00331.3820.0660.14620.0028885968812888016100.1
    1320754412160.450.06890.00161.3820.0350.14540.0023897478811587513100.7
    15882294930.460.0720.00251.4960.0530.15070.0026985709292290515102.7
    16591543320.460.06450.00331.3350.0670.15010.0028758103861299021695.5
    17611023790.270.06870.0031.3800.0610.14560.0027890888802687615100.5
    181192127170.290.06940.00221.3970.0460.14610.0025909658881987914101.0
    19451182500.470.07110.00371.5080.0770.15380.00319601029343192217101.3
    20611513360.450.07030.00311.4800.0650.15270.0028937889222791616100.7
    注:谐和度=100×(207Pb/235U年龄)/(206Pb/238U年龄)
    下载: 导出CSV

    表  2   新元古代早期片麻状-眼球状花岗岩主量元素分析结果

    Table  2   Abundances of major elements of Neoproterozoic granitoids %

    样号岩性SiO2Al2O3Fe2O3FeOCaOMgOK2ONa2OTiO2P2O5MnO烧失量H2O+CO2总量Na2O+K2OA/CNKA/NK
    PM11-30-HQ1片麻状-眼球
    状花岗岩
    66.1813.262.115.352.770.515.3120.790.190.121.210.540.096100.447.310.941.47
    PM11-30-HQ269.0412.962.033.751.980.445.432.190.610.140.11.170.680.032100.557.620.991.37
    PM11-30-HQ369.5313.271.283.521.470.455.942.260.550.130.091.320.560.033100.48.21.031.31
    PM11-30-HQ469.9612.851.73.421.640.555.582.310.60.130.080.990.580.082100.477.891.001.31
    PM11-42-HQ167.8713.991.254.52.280.864.232.940.730.230.090.840.240.012100.067.171.031.49
    PM11-42-HQ269.1613.881.453.482.040.624.582.850.540.180.080.950.44< 0.01100.257.431.041.44
    PM16-2-HQ173.6912.451.061.741.640.625.062.210.390.110.040.80.320.13100.267.271.031.37
    PM16-2-HQ469.5513.321.662.51.950.495.852.650.550.130.061.120.340.362100.538.50.941.25
    PM16-11-HQ1糜棱岩化眼
    球状花岗岩
    70.2814.211.012.081.861.044.073.410.480.10.041.250.550.33100.717.481.061.42
    PM16-11-HQ370.1514.70.992.652.190.712.754.020.450.120.060.980.40.094100.266.771.081.53
    PM16-18-HQ2片麻状-眼球
    状花岗岩
    66.1313.52.014.82.690.595.472.080.790.190.121.430.480.407100.697.550.951.44
    PM16-101-HQ268.3513.911.473.421.841.583.373.10.690.170.071.83<0.010.276100.086.471.151.59
    PM16-101-HQ367.8314.371.672.921.851.394.942.450.630.150.071.520.960.078100.837.391.131.53
    PM18-61-YQ1糜棱岩化眼
    球状花岗岩
    71.3513.740.81.421.310.766.682.180.320.10.041.10.720.081100.68.861.041.27
    PM18-61-YQ267.514.361.832.482.421.344.332.780.590.140.061.971.320.033101.157.111.051.55
    PM18-61-YQ368.5113.921.762.721.681.543.932.910.620.140.0621.480.117101.396.841.151.54
    下载: 导出CSV

    表  3   新元古代早期片麻状-眼球状花岗岩稀土元素分析结果

    Table  3   Abundances of rare earth elements of Neoproterozoic granitoids 10-6

    样号岩性LaCePrNdSmEuGdTbDyHoErTmYbLuYΣREELREEHREELREE/
    HREE
    LaN/
    YbN
    δEu
    PM11-30-HQ1片麻状-眼球
    状花岗岩
    12425929.611322.54.2724.33.8824.2513.72.1313.82.02122641.40552.3789.036.206.450.55
    PM11-30-HQ215231934.912824.83.3125.44.0125.35.3815.22.2814.52.16136756.24662.0194.237.037.520.40
    PM11-30-HQ31362743110820.13.0620.33.1219.2411.51.7110.81.7103644.49572.1672.337.919.030.46
    PM11-30-HQ416032135.212723.53.0924.34.0123.84.9914.12.0612.71.95123757.70669.7987.917.629.040.39
    PM11-42-HQ192.61942280.515.72.5416.12.414.22.87.691.176.921.0572.5459.67407.3452.337.789.600.48
    PM11-42-HQ286.417118.965.212.72.5313.32.112.82.637.171.116.911.0665403.81356.7347.087.588.970.59
    PM16-2-HQ149.810611.843.58.841.278.171.267.261.454.060.634.060.6237.4248.72221.2127.518.048.800.45
    PM16-2-HQ411220624.289.216.21.8116.52.6615.93.39.361.459.311.3882.8509.27449.4159.867.518.630.34
    PM16-11-HQ1糜棱岩化眼
    球状花岗岩
    73.21361551.28.891.078.121.257.281.484.280.634.280.6242.2313.30285.3627.9410.2112.270.38
    PM16-11-HQ362.111412.844.77.680.836.40.94.70.882.410.362.320.3525.9260.43242.1118.3213.2219.200.35
    PM16-18-HQ2片麻状-眼球
    状花岗岩
    10120925.198203.6619.93.12183.69.871.529.861.5291.6524.15456.7667.396.787.350.55
    PM16-101-HQ269.113115.555.79.951.339.221.277.161.440.623.960.6139.9310.82282.5828.2410.0112.520.42
    PM16-101-HQ351.610111.742.68.231.167.61.156.811.363.780.583.710.5737241.85216.2925.568.469.980.44
    PM18-61-YQ1糜棱岩化眼
    球状花岗岩
    4792.410.638.47.381.286.771.066.321.243.520.533.490.5234.7220.51197.0623.458.409.660.54
    PM18-61-YQ257.811212.545.38.521.427.771.237.171.454.020.613.920.639.6264.31237.5426.778.8710.580.52
    PM18-61-YQ371.314416.157.610.51.289.421.47.971.554.160.613.960.5941.6330.44300.7829.6610.1412.920.39
    下载: 导出CSV

    表  4   新元古代早期片麻状-眼球状花岗岩微量元素分析结果

    Table  4   Abundances of trace elements of Neoproterozoic granitoids 10-6

    样号岩性PbCrNiCoRbCsSrBaVNbTaZrHfGeUTh
    PM11-30-HQ1片麻状-眼球
    状花岗岩
    373.813.423.561622.7215314101573.25.02111027.71.753.7328.5
    PM11-30-HQ241.22.732.072.71801.56126108010.862.44.3881621.51.794.3643.8
    PM11-30-HQ343.53.452.252.952042.0215612001253.83.7877120.31.53.7238.2
    PM11-30-HQ439.63.43.33.132172.82142101013.358.54.1885422.91.544.5547.7
    PM11-42-HQ126.520.18.175.392269.9714264738.333.72.259616.31.823.750.9
    PM11-42-HQ229.37.024.433.072357.9513366126.427.51.8849113.91.81550.5
    PM16-2-HQ14211.45.634.062044.718572928.310.70.672758.061.451.9422.6
    PM16-2-HQ437.74.392.763.712283.2490.368018.743.42.9161016.31.843.433.4
    PM16-11-HQ1糜棱岩化眼
    球状花岗岩
    53166.666.331903.3828889034.2141.362396.641.224.1231.2
    PM16-11-HQ331.27.543.824.72115.7520638327.119.61.522646.971.474.9231.1
    PM16-18-HQ2片麻状-眼球
    状花岗岩
    38.84.613.024.441993.13180137019.465.14.25114026.41.663.2618
    PM16-101-HQ225.822.38.989.042029.0118553457.215.81.32788.121.523.0932
    PM16-101-HQ348.319.57.948.432418.0115276952.814.81.162487.361.433.4225.9
    PM18-61-YQ1糜棱岩化眼
    球状花岗岩
    54.611.25.494.12892.8913093622.67.680.681715.421.664.0532.4
    PM18-61-YQ241.824.18.488.522112.7711383651.413.51.12467.121.643.7429.7
    PM18-61-YQ336.922.48.69.422093.311267325114.51.22517.361.423.9637.8
    下载: 导出CSV

    表  5   新元古代片麻状花岗岩Sr-Nd同位素测试结果

    Table  5   Abundances of Sr-Nd of Neoproterozoic granitoids

    样号PM11-30
    -HQ1
    PM11-30
    -HQ2
    PM16-2
    -HQ1
    PM16-2
    -HQ4
    PM11-42
    -HQ1
    PM11-42
    -HQ2
    PM16-101
    -HQ2
    PM16-101
    -HQ3
    PM18-61
    -YQ3
    87Rb/86Sr2.9230553.3898362.7733186.5287004.0653004.5727002.7965004.0239004.511800
    87Sr/86Sr0.7550710.7619950.7456290.7876130.7558980.7642900.7459110.7649200.766481
    0.0000150.0000150.0000130.0000170.0000160.0000150.0000110.0000210.000017
    ISr0.7172230.7181020.7091610.7017630.7024400.7041600.7086950.7113700.705204
    147Sm/144Nd0.1223630.1171790.1225890.1131000.1212000.1163000.1129000.1174000.113800
    143Nd/144Nd0.5121400.5121200.5120340.5120430.5121830.5121350.5119070.5118840.511856
    0.0000080.0000080.0000110.0000100.0000070.0000100.0000110.0000100.000006
    锆石年龄/
    Ma
    906906920920920920931931950
    εNd(0)-9.71-10.10-11.79-11.61-8.88-9.81-14.26-14.71-15.25
    εNd(t)-1.10-0.88-3.07-1.770.01-0.35-4.29-5.27-5.19
    fSm/Nd-0.38-0.40-0.38-0.43-0.38-0.41-0.43-0.40-0.42
    tDM1/Ma168516261866167715941588187720011971
    tDM2/Ma165016321820171515711600192820072016
    下载: 导出CSV

    表  6   新元古代片麻状花岗岩锆石Lu-Hf同位素测试结果

    Table  6   Abundances of Lu-Hf of zircons for the Neoproterozoic granitoids

    测点176Yb/177Hf176Lu/177Hf176Hf/177HfU年龄/MaεHf(0)εHftDM1/MatDM2/MatcDM/MafLu/Hf
    PM16-101-TW3
    10.0782670.0017280.2825190.000022934-8.9510.620.77989105911291135-0.95
    20.0295760.0006100.2822860.000022960-17.193.640.75455135115881603-0.98
    30.0532450.0011140.2823900.0000211005-13.507.990.74790122213501360-0.97
    40.0593850.0012840.2824260.0000231080-12.2310.760.79838117712331239-0.96
    50.0618040.0013980.2824320.000023895-12.046.900.82005117313331344-0.96
    60.0496620.0011640.2823760.000019942-14.016.080.66361124414211433-0.96
    70.0573770.0012720.2824480.0000241003-11.479.880.82656114612291236-0.96
    80.0487730.0011240.2823970.000020911-13.276.170.68598121413911403-0.97
    90.0565920.0012970.2824250.000021965-12.298.210.72471118013041314-0.96
    100.0521200.0011920.2823930.000020930-13.396.430.69463122013901401-0.96
    PM11-30-TW1
    10.0395810.0008610.2825030.000023876-9.519.350.78829105611641172-0.97
    20.0653580.0014410.2825090.000025858-9.298.840.87680106411821191-0.96
    40.0248600.0005310.2823890.000025923-13.546.540.88984120513781389-0.98
    50.0417210.0008890.2824370.000025936-11.858.300.86826115012771286-0.97
    60.0365870.0007910.2824280.000029889-12.186.991.02444116013231333-0.98
    80.0344720.0007400.2823610.000028877-14.534.420.97299125114761489-0.98
    90.0380830.0008200.2824130.000025947-12.687.730.88871118113211331-0.98
    100.0298210.0006560.2823510.000028924-14.905.110.99569126314681481-0.98
    PM16-2-TW1
    10.0711210.0015910.2824750.000023970-10.499.950.81897111711991207-0.95
    20.0787920.0017210.2825390.000022978-8.2412.270.77492103010591063-0.95
    30.0825490.0018160.2824960.000021916-9.759.400.72463109311921200-0.95
    50.0648210.0014270.2824900.000022995-9.9611.100.75681109111461151-0.96
    60.0998520.0019170.2826440.000026870-4.5313.590.89546883891894-0.94
    70.1049050.0021590.2826010.000024887-6.0612.270.85205952988992-0.93
    80.1031840.0022040.2825680.000026921-7.2211.780.92709100110451050-0.93
    90.0736350.0016360.2825030.000026931-9.5210.050.89375107911621169-0.95
    100.0804790.0017280.2825350.000027913-8.3910.740.94546103611051111-0.95
    注:PM16-101-TW3锆石Lu-Hf同位素数据据参考文献
    下载: 导出CSV
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出版历程
  • 收稿日期:  2018-05-02
  • 修回日期:  2018-06-30
  • 网络出版日期:  2023-08-15
  • 刊出日期:  2020-03-14

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