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兴蒙造山带南缘早—中二叠世砂岩碎屑锆石U-Pb年龄、Hf同位素组成及其构造意义

朱俊宾, 和政军

朱俊宾, 和政军. 2017: 兴蒙造山带南缘早—中二叠世砂岩碎屑锆石U-Pb年龄、Hf同位素组成及其构造意义. 地质通报, 36(2-3): 357-371. DOI: 10.12097/gbc.dztb-36-2-3-357
引用本文: 朱俊宾, 和政军. 2017: 兴蒙造山带南缘早—中二叠世砂岩碎屑锆石U-Pb年龄、Hf同位素组成及其构造意义. 地质通报, 36(2-3): 357-371. DOI: 10.12097/gbc.dztb-36-2-3-357
ZHU Junbin, HE Zhengjun. 2017: Detrital zircon U-Pb ages and Hf isotopes of Early-Middle Permian sandstones from the south margin of Xing-Meng orogenic belt and their tectonic significance. Geological Bulletin of China, 36(2-3): 357-371. DOI: 10.12097/gbc.dztb-36-2-3-357
Citation: ZHU Junbin, HE Zhengjun. 2017: Detrital zircon U-Pb ages and Hf isotopes of Early-Middle Permian sandstones from the south margin of Xing-Meng orogenic belt and their tectonic significance. Geological Bulletin of China, 36(2-3): 357-371. DOI: 10.12097/gbc.dztb-36-2-3-357

兴蒙造山带南缘早—中二叠世砂岩碎屑锆石U-Pb年龄、Hf同位素组成及其构造意义

基金项目: 

中国地质调查局项目《中国及邻区海陆大地构造研究》 编号:DD20160343(121201102000150009)

详细信息
    作者简介:

    朱俊宾(1984-),男,博士,工程师,从事大地构造研究。E-mail:zhujunbin0819@163.com

  • 中图分类号: P534.46;P588.21

Detrital zircon U-Pb ages and Hf isotopes of Early-Middle Permian sandstones from the south margin of Xing-Meng orogenic belt and their tectonic significance

  • 摘要:

    利用LA-MC-ICP-MS 分析技术,对兴蒙造山带南缘下二叠统三面井组和中二叠统额里图组砂岩中的碎屑锆石进行了U-Pb 年龄和Hf 同位素研究。结果显示,三面井组砂岩记录了3 组碎屑锆石年龄:280~369Ma(4 颗)、1800~2271Ma(43 颗,峰值1877Ma)和2507~2711Ma(9 颗)。额里图组砂岩碎屑锆石年龄集中分布在271~371Ma(9 颗)、1258~1395Ma(18 颗,峰值1326Ma)和1695~2454Ma(34 颗,峰值1864Ma)3 个年龄区间。对比研究发现,样品中的元古宙和太古宙碎屑锆石是华北克拉通古老基底的反映;晚古生代锆石具有较低的εHf(t)值(-5.3~-23.7)和较老的Hf 模式年龄(1124~3039Ma),与华北克拉通北缘晚古生代岩浆岩具有一致性,而明显区别于兴蒙造山带内岩浆岩Hf 同位素特征,说明前者是其物源供给区。结合区域资料认为,华北克拉通北缘在早―中二叠世期间不存在类似安第斯型的俯冲大陆边缘,三面井组和额里图组砂岩是在伸展背景下沉积形成的。

    Abstract:

    In this paper, the authors used the LA-MC-ICP-MS analytical techniques to determine U-Pb ages and Hf isotopic composition of detrital zircons from the Lower Permian Sanmianjing Formation and Middle Permian Elitu Formation in Zhengxiangbai Banner area of Inner Mongolia on the southern margin of the Xing-Meng orogenic belt. Detrital zircon dating of the sandstone of the Sanmianjing Formation yielded three main age populations respectively at 280~369Ma (4 grains), 1800~2271Ma (43 grains, peaked at 1877Ma), and 2507~2711Ma (9 grains), whereas the Elitu Formation displays prominent age groups at 271~371Ma (9 grains), 1258~1395Ma (18 grains, peaked at 1326Ma) and 1695~2454Ma (34 grains, peaked at 1864Ma), respectively. The detrital zircon geochronological and Hf isotopic studies indicate that the Meso-Proterozoic to Neoarchean grains were probably derived from the basement of the North China Craton. The Late Paleozoic zircons exhibit negative εHf(t) values of -5.3~-23.7 and old Hf model ages of 1124~3039Ma. These characteristics show a strong resemblance to the Late Paleozoic igneous zircons from the north margin of the North China Craton, suggesting that the source of the Sanmianjing Formation and Elitu Formation partly came from the North China Craton. Integration of provenance data with regional geological information and magmatic records suggests that no Andean-type active continental margin was generated on the northern margin of the North China Craton during Early to Middle Permian, and the Sanmianjing Formation and Elitu Formation were deposited in an extensional tectonic environment.

  • 查隆岩体位于西藏昂仁县措迈乡西北部,所处大地构造位置为冈底斯-喜马拉雅造山系(一级)中的拉达克-冈底斯-察隅弧盆系(二级),属中冈底斯北侧的岩浆带。目前普遍认为,冈底斯带中生代花岗岩为新特提斯洋壳向北俯冲和班公-怒江洋向南俯冲共同消减作用的结果[1-3]。另外,前人也对冈底斯中生代岩浆岩的构造性质、构造演化、岩浆活动及成矿作用进行了较多研究。王成善等[4]认为,冈底斯中生代花岗岩是新特提斯洋壳至少2次俯冲消亡和多次俯冲-碰撞的结果;有学者认为,冈底斯带中北部地区的岩浆作用与班公湖-怒江洋壳向南的俯冲作用有关[1-3];也有学者认为,冈底斯带中北部地区的岩浆作用与冈底斯和羌塘地块碰撞后软流圈上涌引起的地壳熔融有关[5]。区域上晚白垩世岩浆大面积出露于南冈底斯带,中冈底斯带一直缺少晚白垩世花岗岩的报道。另外,冈底斯岩浆弧带成矿地质条件优越,孕育了大量的铜、金、银、钼、富铁、铅锌等矿产资源,是青藏高原最重要的成矿区带,但对铁矿的研究明显偏少。在填绘1:5万羊他幅时发现了晚白垩世岩体和查隆磁铁矿点,在对该岩体进行详细野外调查的基础上,结合区域资料,对晚白垩世岩体的岩石成因、地球动力学背景及成矿意义进行探讨,以期对冈底斯带构造岩浆研究提供可靠的基础资料。

    查隆岩体以岩株的形式产出,主要由5个独立的侵入体组成,在研究区呈零星分布,出露面积约9km2(图 1)。在各武勒嘎一带,南部被林子宗群年波组火山岩及第四系不整合覆盖,与围岩接触带岩石有弱的变质变形;在查隆一带侵位于拉嘎组、昂杰组、下拉组,与围岩接触带附近有变质变形、硅化、角岩化现象,岩体接触带附近可见黑云母钾长变粒岩、角岩化粉砂岩、变质含砾细粒岩屑石英砂岩等热接触变质岩。岩体以中酸性岩石为主,岩石类型为黑云花岗闪长岩、花岗闪长岩(图版Ⅰ-ab)。研究区处于冈底斯成矿带中西段,主体位于冈底斯-念青唐古拉中生代、新生代铜钼金铁铬盐类成矿带西段,矿点出露地层为石炭系—二叠系碎屑岩及碳酸盐岩,构造主要表现为断裂、节理,以及与逆断层伴生的牵引褶皱。北西向断裂较常见,为主要的赋矿构造,倾向一般为40°~50°,倾角为55°~ 60°,且多为逆断层。磁铁矿化蚀变带以浸染状的形式赋存于拉嘎组(C2P1l)、昂杰组(P1a)与中细粒黑云母花岗闪长岩岩体的外接触带上。初步圈定磁铁矿体3条,拣块样全铁最高品位68.9%(图版Ⅰ-c)。矿体呈似层状、透镜状产出,围岩硅化、角岩化蚀变较强,且受断层控制明显。矿石矿物主要为磁铁矿,少量赤铁矿、黄铁矿(图版Ⅰ-d)。

    图  1  查隆花岗岩地质简图及大地构造位置(据参考文献修改)
    1—断层;2—同位素采样位置;3—U-Pb年龄值;4—花岗岩体;5—热变质;6—火山岩;7—地层界线;Q—第四系;E3—渐新统;E2—始新统;P2—中二叠统;C-P—石炭系-二叠系;Ⅰ4-2—北喜马拉雅大陆边缘褶冲带北带;Ⅱ1—雅鲁藏布江缝合带;Ⅱ3—拉孜-曲松增生逆推带;Ⅲ1—日喀则弧前盆地;南冈底斯:Ⅲ2—冈底斯下察隅火山岩浆弧;中冈底斯:Ⅲ3—隆格尔-念青唐古拉火山岩浆弧,Ⅲ4—措勤-申扎火山岩浆弧;Ⅲ5—狮泉河蛇绿混杂岩带;北冈底斯:Ⅲ6—班戈-八宿岩浆弧;Ⅳ1—班公-怒江结合带; Ⅳ2—东恰错增生楔逆推带;Ⅴ1—羌南陆块
    Figure  1.  Simplified geological map of the granite in Chalong area and the division of tectonic units in adjacent areas
      图版Ⅰ 
    a.查隆岩体花岗闪长岩;b.闪长岩镜下特征;c.磁铁矿;d.磁铁矿镜下特征。Q—石英;Pl—斜长石;Kfs—钾长石;Mag—磁铁矿;Py—黄铁矿;Hm—赤铁矿
      图版Ⅰ. 

    查隆岩体的主要岩石类型为中细粒花岗闪长岩、细粒-中粒黑云花岗闪长岩。

    中细粒花岗闪长岩:呈灰白色,中细粒半自形粒状结构,块状构造,主要矿物成分为斜长石(56%~57%)、石英(20%~21%)、钾长石(12%~ 13%)、角闪石(4%~5%)和黑云母(3%~4%)。长石可分为1~1.5mm细粒级和2~2.5mm中粒级,不同颗粒相互紧密嵌接,杂乱分布。斜长石呈半自形粒状,较洁净;石英呈他形填隙粒状,洁净;钾长石呈他形粒状,较混浊,显示条纹结构;角闪石呈半自形粒状,浅绿色;黑云母呈半自形片状,红褐色。

    细粒黑云母花岗闪长岩:呈灰白色,细粒花岗结构,块状构造,主要矿物成分为斜长石(50%)、石英(25%)、钾长石(15%)及绿泥石化黑云母(8%),少量磷灰石,金红石+金属矿物含量为2%;另见副矿物为磷灰石、不透明金属矿物等。长石大部分为板柱状,一般粒径在0.90mm×1.72mm以上,个别可达1.15mm×2.25mm~1.43mm×2.80mm;斜长石泥化和绢云母化明显,较浑浊;钾长石略具泥化现象,个别可见卡氏双晶,为正长石;石英多为不规则粒状,分布于长石粒间,粒径一般小于0.70mm,个别可达1.00mm;黑云母为片状,最大片径0.71mm × 1.00mm,大部分已绿泥石化并有细针状或网状金红石,部分可见铁质析出物;副矿物见磷灰石,多为不规则状,粒径小于0.12mm;金属矿物多为较规则粒状,一般粒径小于0.25mm,部分有白钛矿化特征。

    磁铁矿石特征(图版Ⅰ-c):呈黑色,他形粒状结构,块状构造。主要金属矿物为磁铁矿(90%),另见赤铁矿(3%)和个别黄铁矿。磁铁矿一般粒径小于0.15mm,镶嵌分布,沿边部及解理裂隙可见赤铁矿交代的现象,黄铁矿仅见个别微粒,粒径小于0.005mm。脉石矿物主要为石榴子石(7%),不规则粒状,粒径一般小于0.30mm,个别可达0.63mm,裂隙较发育,部分裂隙中见少量绿泥石及个别石英,充填分布于金属矿物粒间。

    将5件新鲜花岗闪长岩样品无污染碎样至200目后,送至自然资源部西安矿产资源监督检测中心,分析其岩石化学数据。样品加工前先切掉氧化或蚀变膜。岩石化学成分用XRF光谱测定,分析精度一般优于2%。微量元素用XRF玻璃饼熔样,以保证样品中的副矿物全部溶解,然后在ICP-MS上测定,分析精度一般为2%~5%。

    锆石单矿物分离在河北廊坊区域地质调查研究所完成。将约5kg的样品破碎至60~80目,淘洗后获得重砂,再经过磁选,得到纯度较高的试样,在双目显微镜下挑选出晶形和透明度较好的锆石颗粒,制作成环氧树脂样品靶。待环氧树脂充分固化后打磨抛光至锆石颗粒中心暴露,然后拍摄反射光、透射光和阴极发光图像,最后进行LA-ICPMS U-Pb同位素测定。锆石的阴极发光(CL)图像在西北大学大陆动力学国家重点实验室扫描电镜加载阴极发光仪上完成。

    LA-ICP-MS测定在西北大学大陆动力学重点实验室完成,使用的ICP-MS为Agilient公司生产的Agilient7500a。锆石U-Pb定年及微量元素分析在同一个系统内同时完成,分析仪器为配备193nmArF-excimer激光器的Geo-Las200M型激光剥蚀系统和Elan6100DRC型四极杆质谱仪,激光束斑直径为44μm。LA-ICP-MS激光剥蚀采样采用单点剥蚀的方式, 数据分析前用NIST610进行仪器调试, 使之达到最优状态。在测试过程中每测定5个样品点后, 重复测定一次标准锆石91500和一次标准玻璃NIST610进行校正,观察仪器的状态以保证测试的精度。锆石年龄计算采用标准锆石91500为外标,元素含量采用美国国家标准物质局人工合成硅酸盐玻璃NISTSRM610为外标,29Si为内标元素进行校正。数据采集处理采用Glitter(Version4.0),并采用Anderson软件[6]对测试数据进行普通铅校正,年龄计算及谐和图绘制采用Isoplot(3.0版)软件[7]完成。因样品年轻,采用206Pb/238U年龄,206Pb/238U年龄加权平均值误差具95%置信度。

    岩石化学分析结果见表 1。SiO2含量为65.32%~69.19%,平均为67.10%,在TAS分类图解上位于花岗闪长岩区(图 2),为中酸性侵入岩类。K2O/Na2O=0.86~2.00,平均为1.31,显示贫钠富钾特征;SiO2-K2O岩石系列判别图解显示为高钾钙碱性系列岩石(图 3-a)。Al2O3含量为13.75% ~ 15.38%,平均为14.63%,A/CNK=0.95~1.12,平均为1.00,均小于1.1,岩石铝饱和指数判别图解显示属于准铝质花岗岩(图 3-b)。里特曼指数σ=0.78~ 2.09,大部分大于1.8;全碱(K2O + Na2O)含量为6.04%~7.49%,平均为6.84%;AR=1.8~2.16,平均为2.05。固结指数(SI)为0.71~1.32,平均为0.94;分异指数(DI)为71.18~73.08,平均为72.18,说明岩浆结晶分异程度较高。

    表  1  查隆花岗岩主量、微量和稀土元素分析结果
    Table  1.  Major, trace and rare earth element compositions of granite in Chalong area
    样品号 D1641-1 D1658-1 D1660-1 D1573-1 D1574-2
    岩石名称 中细粒花岗闪长岩 细粒黑云母花岗闪长岩 中粒黑云花岗闪长岩
    SiO2 66.5 69.19 67.74 65.32 66.74
    Al2O3 14.3 14.34 13.75 15.37 15.38
    MgO 2.05 1.41 1.89 1.97 1.65
    CaO 2.68 2.13 2.55 3.93 3.1
    Na2O 3.21 2.36 3.05 3.25 3.23
    K2O 4.13 4.71 4.44 2.79 3.01
    P2O5 0.2 0.14 0.19 0.18 0.15
    MnO 0.14 0.06 0.07 0.11 0.1
    TiO2 0.66 0.54 0.61 0.59 0.51
    TFe2O3 4.86 3.86 4.47 5.11 4.48
    烧失量 2.18 1.7 1.83 0.62 0.97
    总计 100.91 100.44 100.59 99.24 99.32
    A/NK 1.47 1.6 1.4 1.84 1.79
    A/CNK 0.98 1.12 0.95 0.99 1.08
    R1 2220 2598 2299 2443 2518
    R2 680 588 646 834 729
    Y 21.3 21.8 19.7 19.4 16
    La 64.2 38.8 60.1 43.7 30
    Ce 134 79 122 80 58.2
    Pr 13.6 8.54 12.7 8.14 5.96
    Nd 47.3 30.1 44.9 29.8 22.3
    Sm 6.96 5.67 7.19 5.1 4.06
    Eu 1.33 0.99 1.22 1.22 1.1
    Gd 6.99 5.64 6.51 4.88 3.71
    Tb 0.74 0.66 0.6 0.52 0.46
    Dy 3.79 3.96 3.57 3.37 2.75
    Ho 0.63 0.65 0.6 0.54 0.47
    Er 1.93 2.05 1.89 1.83 1.58
    Tm 0.24 0.27 0.28 0.22 0.21
    Yb 1.75 2.08 1.77 1.82 1.47
    Lu 0.22 0.29 0.24 0.25 0.2
    ΣREE 283.38 178.7 263.47 181.39 132.47
    LREE 267.09 163.1 248.01 167.96 121.62
    HREE 16.29 15.6 15.46 13.43 10.85
    LREE/ 16.4 10.46 16.04 12.51 11.21
    HREE 26.31 13.38 24.36 17.22 14.64
    (La/Yb)N 2.03 4.1 1.72 3.07 4.17
    (La/Sm)N 3.82 1.82 1.62 1.61 1.91
    (Gd/Lu)N 0.58 0.53 0.53 0.74 0.85
    δEu 34287.26 39102.42 36860.88 23162.58 24989.02
    K 3956.7 3237.3 3656.95 3537.05 3057.45
    Ti 981.9 600.2 662.9 828 626
    P 707.9 607.8 506.8 506 517
    Ba 33.4 24.7 43 26.8 22.7
    Th 3.17 2.26 6.24 2.38 1.64
    U 1.06 1.28 3.61 2.39 1.78
    Ta 7.41 15.8 25.1 13.7 14.2
    Nb 173 200 190.8 115 127
    Rb 225.4 211.5 210.1 163 126
    注:元素分析由自然资源部西安矿产资源监督检测中心完成;主量元素含量单位为%,微量和稀土元素为10-6
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    图  2  查隆花岗岩SiO2-(Na2O +K2O)图解(底图据参考文献[8])
    Figure  2.  SiO2-(Na2O +K2O)diagram of granite in Chalong area
    图  3  查隆花岗岩SiO2-K2O图解(a, 底图据参考文献[9])和A/CNK-A/NK图解(b, 底图据参考文献[10])
    Figure  3.  SiO2 versus K2O diagram (a) and A/CNK versus A/NK diagram (b) of granite in Chalong area

    稀土元素分析结果见表 1。稀土元素总量(ΣREE)变化较大,ΣREE为132×10-6~283×10-6,LREE/HREE值为10.46~16.40,平均为12.98,(La/Yb)N值为13.38~26.31,平均为18.39,表明轻稀土元素较富集且分馏程度较高。稀土元素球粒陨石标准化配分曲线呈右倾特征,轻稀土元素富集,重稀土元素亏损,表明该岩浆经过一定程度的分异(图 4-a)。δEu值为0.53~0.85,显示中等的负Eu异常,配分曲线在Eu处的沟谷不明显,反映该岩体虽有微弱的亏损,但分异程度不明显。

    图  4  查隆花岗岩稀土元素球粒陨石标准化配分型式图(a)和微量元素原始地幔标准化蛛网图(b)(底图据参考文献[11])
    Figure  4.  Chondrite-normalized REE patterns (a) and trace element spider diagrams (b) for granite in Chalong area

    微量元素分析结果见表 1。原始地幔标准化微量元素蛛网图(图 4-b)显示,Th、Rb、K元素含量偏高,显示正异常;Ba、Nb、P、Ti元素显示负异常;比值蛛网图呈“W”型,大离子亲石元素Rb、K相对富集,Ba、Sr相对亏损;高场强元素Th、La、Nd相对富集,Ti、Nb、P相对亏损,P和Ti亏损一般与俯冲有关,这种特点与火山弧环境的花岗岩类似。

    测年样品均采于查隆岩体中部。其中, 样品RZ1641-1为中细粒花岗闪长岩,锆石晶形较完好,多呈长柱状,长宽比为2~3,发育明显的振荡环带,为典型的岩浆成因锆石。测得24粒锆石24个数据的206Pb/238U年龄介于88.5~91.3Ma之间(表 2图 5),其年龄加权平均值为89.88±0.55Ma(95%置信度),MSWD=0.43(图 5)。

    表  2  查隆岩体花岗闪长岩(RZ1641-1)和黑云花岗闪长岩(RZ1573-1)LA-ICP-MS锆石U-Th-Pb同位素数据
    Table  2.  LA-ICP-MS zircon U-Th-Pb data of granodiorite (RZ1641-1) and biotite granodiorite(RZ1573-1)in Chalong area
    测点号 同位素比值 年龄/Ma
    207Pb/206Pb 207Pb/235U 206Pb/238U 208Pb/232Th 207Pb/206Pb 207Pb/235U 206Pb/238U 208Pb/232Th
    花岗闪长岩
    1 0.0479 0.0034 0.0936 0.0063 0.0142 0.0002 0.0043 0.0001 95 160 91 6 91 2 87 2
    2 0.0475 0.0022 0.0921 0.0039 0.0141 0.0002 0.0045 0.0001 73 108 90 4 90 1 91 1
    3 0.0477 0.0024 0.093 0.0043 0.0141 0.0002 0.0044 0.0001 83 116 90 4 91 1 89 2
    4 0.0473 0.0061 0.0925 0.0116 0.0142 0.0004 0.0047 0.0002 65 283 90 11 91 3 94 4
    5 0.0484 0.0026 0.0923 0.0045 0.0138 0.0002 0.0042 0.0001 119 120 90 4 89 1 84 2
    6 0.0476 0.0021 0.0931 0.0037 0.0142 0.0002 0.0045 0.0001 76 103 90 3 91 1 91 1
    7 0.0473 0.0042 0.0926 0.0079 0.0142 0.0003 0.0045 0.0001 63 199 90 7 91 2 92 3
    8 0.0482 0.0071 0.0922 0.0132 0.0139 0.0004 0.0048 0.0002 107 315 90 12 89 3 97 4
    9 0.0476 0.0024 0.093 0.0043 0.0142 0.0002 0.0044 0.0001 78 117 90 4 91 1 88 2
    10 0.0471 0.0025 0.0927 0.0045 0.0143 0.0002 0.0047 0.0001 55 120 90 4 91 1 94 2
    11 0.0481 0.0064 0.0929 0.0121 0.014 0.0004 0.0049 0.0002 106 289 90 11 90 2 98 4
    12 0.0478 0.0027 0.0911 0.0047 0.0138 0.0002 0.0047 0.0001 89 128 89 4 89 1 96 2
    13 0.047 0.0051 0.0916 0.0097 0.0141 0.0003 0.0048 0.0002 50 242 89 9 91 2 97 4
    14 0.0479 0.004 0.0923 0.0073 0.014 0.0003 0.0045 0.0001 95 185 90 7 90 2 90 2
    15 0.047 0.0023 0.0917 0.0041 0.0142 0.0002 0.0043 0.0001 49 112 89 4 91 1 86 2
    16 0.0469 0.0025 0.0906 0.0045 0.014 0.0002 0.0043 0.0001 45 125 88 4 90 1 87 1
    17 0.0483 0.0034 0.0933 0.0063 0.014 0.0002 0.0046 0.0001 112 160 91 6 90 1 92 2
    18 0.0481 0.0029 0.0922 0.0051 0.0139 0.0002 0.0046 0.0001 102 134 90 5 89 1 92 2
    19 0.0482 0.0026 0.0924 0.0046 0.0139 0.0002 0.0043 0.0001 109 122 90 4 89 1 87 2
    20 0.0477 0.0036 0.0909 0.0065 0.0138 0.0002 0.0041 0.0001 85 171 88 6 89 2 83 2
    21 0.0481 0.0031 0.0925 0.0056 0.014 0.0002 0.0045 0.0001 103 144 90 5 89 1 90 2
    22 0.0482 0.0065 0.0936 0.0123 0.0141 0.0004 0.0046 0.0002 107 292 91 11 90 2 93 4
    23 0.048 0.0065 0.0916 0.0122 0.0138 0.0004 0.0048 0.0002 97 295 89 11 89 2 97 4
    24 0.0489 0.0039 0.0942 0.0071 0.014 0.0002 0.0043 0.0001 145 176 91 7 89 2 87 2
    黑云花岗闪长岩
    1 0.0469 0.0065 0.0885 0.0117 0.0137 0.0004 0.004 0.0003 41 301 86 11 88 3 82 6
    2 0.0482 0.0052 0.0895 0.0091 0.0135 0.0004 0.0039 0.0002 111 235 87 8 86 2 78 4
    3 0.0481 0.0025 0.0904 0.0039 0.0136 0.0002 0.0042 0.0001 104 117 88 4 87 1 85 2
    4 0.0478 0.0029 0.0921 0.0049 0.014 0.0002 0.0045 0.0001 86 137 90 5 90 2 90 3
    5 0.0477 0.0061 0.0917 0.0112 0.014 0.0004 0.0047 0.0003 82 279 89 10 89 3 95 6
    6 0.048 0.0026 0.0848 0.004 0.0128 0.0002 0.0039 0.0001 97 125 83 4 82 1 79 2
    7 0.0481 0.0032 0.0904 0.0053 0.0136 0.0002 0.0042 0.0001 105 148 88 5 87 2 85 2
    8 0.0473 0.008 0.0853 0.014 0.0131 0.0005 0.0043 0.0004 65 360 83 13 84 3 87 7
    9 0.0477 0.004 0.0901 0.0071 0.0137 0.0003 0.0041 0.0002 81 190 88 7 88 2 82 3
    10 0.0477 0.0039 0.0862 0.0066 0.0131 0.0003 0.004 0.0002 85 185 84 6 84 2 80 3
    11 0.0478 0.0027 0.087 0.0042 0.0132 0.0002 0.0038 0.0001 86 127 85 4 85 1 77 2
    12 0.0473 0.0043 0.0863 0.0073 0.0132 0.0003 0.004 0.0002 63 202 84 7 85 2 81 3
    13 0.0475 0.0028 0.0908 0.0047 0.0139 0.0002 0.004 0.0001 76 135 88 4 89 1 81 2
    14 0.0478 0.004 0.0885 0.007 0.0134 0.0003 0.0041 0.0002 86 190 86 7 86 2 82 3
    15 0.049 0.0166 0.0913 0.0303 0.0135 0.0009 0.0043 0.0004 146 646 89 28 87 6 86 8
    16 0.0479 0.0036 0.0922 0.0064 0.014 0.0003 0.0043 0.0001 93 171 90 6 89 2 88 3
    17 0.0477 0.0038 0.0924 0.0069 0.014 0.0003 0.0044 0.0002 84 181 90 6 90 2 88 3
    18 0.0477 0.0028 0.0892 0.0047 0.0136 0.0002 0.0042 0.0001 81 136 87 4 87 1 84 2
    19 0.0477 0.003 0.0877 0.0049 0.0133 0.0002 0.004 0.0001 85 142 85 5 85 2 81 2
    20 0.0485 0.0031 0.0912 0.0053 0.0137 0.0002 0.0041 0.0001 121 146 89 5 87 2 83 2
    21 0.0477 0.0028 0.0869 0.0044 0.0132 0.0002 0.0042 0.0001 81 133 85 4 85 1 85 3
    22 0.0483 0.0028 0.0904 0.0045 0.0136 0.0002 0.0041 0.0001 115 129 88 4 87 1 82 3
    23 0.0477 0.0032 0.0933 0.0057 0.0142 0.0003 0.0042 0.0001 85 155 91 5 91 2 85 3
    24 0.0479 0.0028 0.0933 0.0047 0.0141 0.0002 0.0045 0.0001 91 132 91 4 91 2 90 2
    25 0.0473 0.0029 0.0855 0.0047 0.0131 0.0002 0.004 0.0001 62 142 83 4 84 1 81 2
    26 0.0482 0.0086 0.0846 0.0146 0.0127 0.0005 0.0042 0.0003 109 372 83 14 82 3 84 7
    27 0.0468 0.0027 0.0877 0.0043 0.0136 0.0002 0.0041 0.0001 41 130 85 4 87 1 82 2
    28 0.0482 0.0031 0.0921 0.0053 0.0139 0.0003 0.0042 0.0001 109 144 89 5 89 2 85 3
    29 0.0473 0.0053 0.0865 0.0092 0.0133 0.0004 0.0043 0.0002 63 247 84 9 85 2 86 4
    30 0.0478 0.0032 0.0889 0.0053 0.0135 0.0003 0.004 0.0001 89 151 87 5 86 2 81 2
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    图  5  查隆花岗岩(RZ1641-1)锆石阴极发光(CL)图像(a)和U-Pb年龄谐和图(b、c)
    Figure  5.  CL images (a) and U-Pb concordia diagrams (b, c) of zircon from granite (sample RZ1641-1) in Chalong area

    样品RZ1573-1为黑云花岗闪长岩,锆石晶形较完好,多呈长柱状,长宽比为2~4,发育明显的振荡环带,为典型的岩浆成因锆石。测得29粒锆石的30个数据的206Pb/238U年龄介于82.1~90.8Ma之间,其年龄加权平均值为86.6±1.0Ma(95%置信度),MSWD=0.43(表 3;图 6)。

    图  6  查隆黑云花岗闪长岩(RZ1573-1)锆石阴极发光(CL)图像(a)和U-Pb年龄谐和图(b、c)
    Figure  6.  CL images (a) and U-Pb concordia diagrams (b, c) of zircon from biotite granodiorite (sample RZ1573-1) in Chalong area

    晚白垩世花岗岩多分布于南冈底斯中东段,中冈底斯和北冈底斯零星出露。其中南冈底斯带门巴地区金达北部的花岗闪长岩年龄为68.8± 1.6Ma(U-Pb年龄)[12],朗县—米林地区的花岗岩年龄介于84~78Ma之间(U-Pb年龄)[13],雪拉岩体的花岗闪长岩年龄为70.4±2.2Ma(U-Pb年龄)[14],谢通门地区的花岗岩年龄介于110~90Ma之间(U-Pb年龄)[15];而冈底斯带西北缘的扎隆琼娃石英二长岩年龄为85.6±0.48Ma(U-Pb年龄)[16],中冈底斯带岩体的花岗闪长岩年龄为74.8±1.6Ma(U-Pb年龄)[17],扎布耶茶卡的第二期闪长岩年龄为100.2±0.75Ma[18]。可见区域上既有晚白垩世早期的岩体也有晚白垩世末期的岩体,岩性以花岗闪长岩为主,多为俯冲型的Ⅰ型花岗岩。本文中2个年龄样品采自中冈底斯,年龄介于89.88~ 86.6Ma之间,岩性、地球化学特征及构造环境与区域上高度一致。结合目前冈底斯带晚白垩世岩体的特点,纵向上具有从北向南年龄变老的趋势,反映从俯冲到碰撞造山岩浆活动的中心总体从南向北发生迁移的过程。

    岩相学上没有发现堇青石、石榴子石、白云母等传统意义上S型花岗岩判别标志的富铝矿物。岩石CIPW标准矿物计算显示,刚玉分子3个样品均小于1%,Na2O含量多接近或大于3.2%,反映Ⅰ型花岗岩的特点。综上所述,查隆岩体应为高钾钙碱性的准铝质Ⅰ型花岗岩。

    研究表明,微量元素是岩浆混合作用和成岩过程的最好记录,壳、幔两类岩浆混合及成岩过程中,有显著的元素迁移和成分交换,并形成独特的扩散作用[19]。根据微量元素地球化学性质,Rb为强不相容元素,Ti为高场强元素,来自不同岩浆房成岩后,Rb/Ti值变化较大[20]。查隆岩体的Rb/Ti值为0.03~0.06,说明幔源基性岩浆和壳源酸性岩浆已经发生混合岩浆作用。Nb、Ta为强不相容元素,在侵蚀和变质作用过程中较稳定, Nb/Ta值可以示踪原始岩浆源区的特征[21-22]。查隆花岗闪长岩的Nb/ Ta值为5.73~12.34,其特征介于原始地幔(17.39)[23]和大陆地壳(Nb/Ta=11~12)[24]之间,暗示岩浆源区可能由地幔熔体和地壳熔体的混合形成。另外,熔融实验研究表明,陆壳熔融通常富钠,不能形成具高钾钙碱性特征的花岗质岩浆[25-27]。Panino等[27]根据陆壳岩石熔融结果,提出高钾钙碱性花岗岩通常是壳幔混合的结果。综上所述,查隆岩体岩浆来源显示了壳幔岩浆混合起源的特征。

    研究认为,新特提斯洋大致在晚三叠世或更早的时间打开,同时形成班公湖-怒江洋(北支)及雅鲁藏布洋(南支)[28]。大致于中侏罗世扩张到最大规模,然后开始消减缩小。北支班公湖-怒江洋大致在早白垩世末(100Ma左右)完全闭合,完成了拉萨地块与羌塘地块的碰撞拼合,南支雅鲁藏布洋闭合较晚。在古近纪印度大陆开始与拉萨地块碰撞[29]。而弧背断隆带和中冈底斯的形成时代分别为105~ 135Ma和95~145Ma,说明至少在早侏罗世,冈底斯带还受到班公湖怒江洋向南、雅鲁藏布江洋向北的双向俯冲作用影响,直到晚白垩世竟柱山组(位于岩体西北部)在93.9~100.5Ma沉积时,冈底斯中北部的俯冲作用才基本停止[30]。雅鲁藏布洋板块自中侏罗世开始向北俯冲于拉萨地块之下,65~70Ma前,雅鲁藏布洋开始闭合,印度-亚洲大陆开始碰撞[3]

    本次获得的年龄无疑属于新特提斯洋板块俯冲阶段,是俯冲成因的花岗闪长岩,表明在冈底斯带中部晚白垩世早期(约90Ma)至少存在一期由俯冲作用诱导的岩浆混合作用。到晚白垩世时,班公-怒江洋盆已经闭合,雅鲁藏布江洋盆向北单向强烈俯冲,由于洋壳俯冲速度不断加快,沿俯冲带产生的摩擦力持续增强,重熔速度加快,使地壳深部物质熔融。岩体的岩浆源区来自于上地幔和下地壳物质不断熔融,由于幔源岩浆在上侵过程中与下地壳物质发生不同程度的混溶作用,形成晚白垩世花岗闪长岩及同时期的磁铁矿。双向剪刀式俯冲作用只能解释早侏罗世―早白垩世的花岗岩特点,到晚白垩世已经变成单向俯冲,区域上晚白垩世岩体集中发育在南冈底斯带,该岩体的发现及认识对研究中冈底斯带晚白垩世岩浆作用的深部动力学过程具有重要意义。

    查隆地区的磁铁矿与燕山末期的中酸性岩浆侵入活动有关,岩浆演化晚期分离出成矿热液,沿层间裂隙、构造破碎带等部位与围岩发生接触交代反应,形成磁铁矿体。区内石炭系―二叠系沉积地层,燕山末期的侵入岩及近北西向大断裂控制的次级断裂和褶皱的发育构成了最有利的成矿岩性组合及控矿条件。中酸性花岗闪长岩直接侵入到有较强变形的石炭系―二叠系沉积地层,矿区构造复杂,具备良好的围岩条件,发现的磁铁矿石品位较富,说明该区是寻找与接触交代作用有关的富铁矿产地的有利区域,有望在区内找到中等以上规模的富磁铁矿产地。

    磁铁矿石普遍石榴子石化、少量绿泥石化,矿点的东侧及南侧均有中二叠统下拉组灰岩发育,具有矽卡岩型磁铁矿特征;脉状和浸染状磁铁矿的出现,表明矿床后期具有热液叠加特征。综上所述,该矿床早期为矽卡岩型成矿,后期叠加热液改造,其中矽卡岩期是磁铁矿形成的主要阶段,矿床成因类型应为矽卡岩-热液叠加改造型磁铁矿床。

    冈底斯带中北部晚白垩世可能发生过金属成矿大爆发,目前在冈底斯中北部已发现日阿铜矿床、尕尔穷铜矿床、拔拉扎铜钼矿床等,这些矿床的成矿环境、成矿条件、控矿构造、岩体地球化学特征等都具有相似性,可能属于同一成矿系统。该磁铁矿点的发现对开展西藏冈底斯中北部地区中生代矽卡岩型铁铜矿典型矿床的成矿作用、找矿方向具有重要意义。

    (1)查隆花岗闪长岩和黑云花岗闪长岩锆石U-Pb年龄分别为86.6±1.0Ma和89.88±0.55Ma,为雅江洋壳向北俯冲作用延续到晚白垩世的年代学证据,该岩体的发现为中冈底斯带存在晚白垩世岩浆活动提供了证据。

    (2)岩石学、岩石地球化学特征显示,查隆岩体为高钾钙碱性Ⅰ型花岗岩,为壳幔混合的产物。

    (3)查隆磁铁矿的成因类型为矽卡岩型-热液叠加改造型,对研究西藏冈底斯中北部地区中生代矽卡岩型铁铜矿典型矿床的成矿作用和找矿方向具有重要意义。

    致谢: 野外工作期间得到中国地质科学院地质研究所赵磊、徐芹芹副研究员的大力支持和帮助,成文过程中得到任纪舜研究员的指导,LAICP-MS 锆石U-Pb 定年和Hf 同位素测试得到天津地质调查中心周红英教授级高工的帮助,审稿专家对本文提出宝贵的修改意见,在此一并表示衷心的感谢.
  • 图  1   研究区地质简图

    Figure  1.   Geological sketch map of the study area

    图  2   正镶白旗南部三面井组和额里图组实测剖面

    Figure  2.   Geological sections of the Sanmianjing Formation and ElituFormation in southern Zhengxiangbai Banner area

    图  3   三面井组(a、c)和额里图组(b、d)野外照片及砂岩样品显微照片

    Pl—斜长石;Kfs—钾长石;Qtz—石英;Ms—白云母

    Figure  3.   Photomicrographs of sandstone samples and field photographsof the Sanmianjing Formation and Elitu Formation

    图  4   三面井组和额里图组砂岩部分代表性碎屑锆石CL 图像(实线圆圈表示U-Pb 测点位置,虚线圆圈表示Hf 同位素测点位置, 下面数字为Hf 同位素值)

    Figure  4.   Representative CL images of detrital zircons in sandstonesfrom the Sanmianjing Formation and Elitu Formation

    图  5   三面井组和额里图组砂岩碎屑锆石U-Pb 谐和图和年龄频率分布图

    Figure  5.   Concordia and probability density plots of detrital zircon U-Pb ages forrocks sandstones from the Sanmianjing Formation and Elitu Formation

    图  6   三面井组和额里图组砂岩碎屑锆石t-εHf(t)图解

    Figure  6.   Diagrams of εHf(t) values versus crystallizing ages of detrital zircon forsandstones from the Sanmianjing Formation and Elitu Formation

    表  1   三面井组和额里图组砂岩LA-ICP-MS 锆石U-Th-Pb 分析结果

    Table  1   Results of LA-ICP-MS zircon U-Th-Pb dating for the sandstonesfrom the Sanmianjing Formation and Elitu Formation

    样品号
    测点号
    PbU232Th/238U同位素比值年龄/Ma
    /10-6206Pb/238U207Pb/235U207Pb/206Pb206Pb/238U207Pb/235U207Pb/206Pb
    样品号14SMJ4
    12114760.79560.35910.00366.0280.0830.12170.0015197820198027198221
    22517640.24070.31510.00334.8520.0670.11170.0013176618179425182721
    31443980.26190.34840.00355.6870.0760.11840.0014192719192926193221
    4153030.47530.04440.00050.31750.00990.05190.00162803280927970
    5391020.51330.33850.00345.3250.0750.11410.0014188019187326186523
    6641720.45940.33600.00345.2780.0720.11390.0014186819186525186322
    7771350.62670.47840.004810.960.150.16610.0020252025252034251920
    81514570.04230.33320.00335.3310.0730.11600.0014185418187426189622
    91474140.15740.34870.00355.7610.0790.11980.0014192819194126195421
    102084471.16730.37290.00398.3090.110.16160.0019204321226531247220
    11611110.54910.47650.004810.890.150.16580.0020251225251434251620
    121634650.25190.33940.00345.4040.0710.11550.0014188419188525188821
    131574330.34230.34480.00355.5560.0750.11690.0014191019190926190921
    141373270.45500.38480.00396.8950.0930.12990.0015209921209828209721
    152734830.77570.47320.005210.950.160.16780.0020249828251936253620
    161143390.23120.33040.00335.2490.0720.11520.0014184119186126188322
    171283380.69820.33470.00355.2590.0730.11400.0014186119186226186322
    1829310170.38690.28180.00284.8280.0650.12420.0015160116179024201821
    192406900.36640.33230.00345.2080.0710.11370.0013185019185425185921
    201264380.48270.27730.00294.6290.0640.12110.0014157817175524197221
    211744920.59020.32490.00335.0180.0670.11200.0013181418182224183321
    22772030.86800.32880.00345.1480.0700.11350.0013183319184425185721
    23122360.52880.04840.00050.34850.0120.05220.001730533041029373
    24822400.45080.32570.00345.0180.0700.11180.0013181719182225182822
    25722070.62110.32160.00334.9330.0690.11120.0013179819180825182022
    26243461.18320.05830.00060.43330.00860.05390.00103664366736642
    27421200.56290.32500.00335.0790.0700.11340.0014181418183325185422
    28822170.92370.32480.00335.0560.0680.11290.0013181318182925184721
    29152460.44670.05890.00060.44360.0120.05460.001436943731039657
    30831730.31180.44830.004510.230.140.16550.0019238824245633251320
    311393610.86280.33320.00345.2950.0710.11530.0014185419186825188421
    321986120.31580.31560.00315.0450.0680.11590.0014176817182724189421
    331494230.10870.35310.00365.8370.0800.11990.0014194920195227195421
    34771950.81890.33690.00345.4000.0740.11620.0014187219188526189921
    351905340.40290.33930.00356.1350.0840.13110.0015188319199527211321
    362134010.56160.46270.004710.880.150.17050.0020245225251334256220
    37931660.58460.49000.005111.560.160.17110.0020257127257035256920
    38812260.43260.33480.00345.3250.0730.11530.0014186219187326188522
    391745250.09010.33500.00345.3420.0750.11560.0014186319187626189022
    40992241.33860.33180.00335.2480.0730.11470.0014184719186026187622
    411644330.67200.33010.00335.1840.0710.11390.0014183918185025186222
    样品号14SMJ4
    423188030.49440.35880.00365.9390.0800.12010.0014197620196727195721
    431163180.44080.33590.00345.3100.0720.11470.0014186719187025187521
    443779900.55720.34340.00375.5250.0760.11670.0014190320190526190621
    45451170.71710.33500.00335.3690.0740.11620.0014186319188026189922
    4641990.91190.34160.00355.5350.0780.11750.0015189419190627191923
    471103280.70680.30230.00344.8390.0700.11610.0014170319179226189721
    481624530.26590.34570.00365.6140.0780.11780.0014191420191827192322
    49511181.14660.34900.00365.7020.0810.11850.0015193020193227193422
    501273780.49340.31760.00335.4820.0760.12520.0015177818189826203121
    51912550.29010.35130.00365.9010.0800.12180.0014194120196127198321
    523425751.38460.46020.004610.470.140.16500.0019244024247733250820
    532117080.09130.30200.00314.6980.0640.11280.0013170118176724184621
    541313930.16890.33560.00345.2760.0720.11400.0013186519186525186521
    551712481.24320.52440.005413.480.190.18650.0022271828271437271119
    56551560.34200.33890.00355.3850.0780.11520.0015188219188227188323
    57411150.52490.32370.00334.9310.0750.11050.0015180818180828180725
    581654550.76150.32060.00335.0610.0690.11450.0013179319183025187221
    591734110.04840.42100.00458.3330.120.14360.0017226524226833227120
    60732070.51540.32420.00334.9200.0680.11010.0013181018180625180022
    611353870.38550.33440.00365.3190.0730.11530.0014186020187226188521
    622464670.56120.47000.004810.690.150.16500.0020248425249734250720
    样品号14ELT3
    1913850.42410.22640.00222.6410.0370.08460.0011131613131218130724
    2341430.46060.22050.00222.5860.0410.08510.0012128413129720131727
    3793740.13540.21760.00222.4760.0500.08250.0014126913126526125832
    43108400.58690.32910.00325.0840.0680.11210.0013183418183425183321
    51333720.39410.33460.00335.2470.0710.11370.0014186118186025186022
    6327030.45270.04290.00040.3080.00650.05210.00102713273628946
    71434120.23190.33650.00335.2920.0720.11410.0014187018186825186522
    81353820.24960.33960.00335.3390.0740.11400.0014188518187526186522
    938410920.05950.35530.00355.9410.0820.12130.0015196019196727197522
    10153230.50970.04360.00040.3090.00810.05150.00132753274726258
    11692820.33320.23320.00232.7770.0380.08640.0011135113134919134724
    121715360.15160.31730.00344.8820.0700.11160.0013177719179926182521
    13605620.27320.10960.00161.2100.0240.08010.00126701080516119830
    141965940.17590.32110.00325.2760.0720.11920.0014179518186525194421
    151293360.30510.35560.00356.1210.0850.12480.0016196119199328202722
    16255450.58420.04290.00040.3050.00630.05160.00102713271626745
    17832360.42690.32470.00325.1220.0710.11440.0014181218184026187122
    183148280.51670.33730.00335.4800.0750.11780.0014187418189726192322
    191524140.53780.32350.00325.2570.0710.11790.0014180718186225192421
    样品号14ELT3
    201284950.34990.23780.00313.5630.0610.10870.0013137518154126177822
    211584900.20360.31660.00314.8950.0660.11220.0013177318180124183521
    2254911.28760.44130.00499.7250.150.15980.0020235726240936245421
    233159310.16020.33540.00335.2730.0720.11400.0014186418186425186422
    24572470.30080.22540.00222.6200.0380.08430.0011131013130619129925
    25316680.64370.04320.00040.31100.00600.05220.00092733275529441
    262346970.08920.33970.00355.4630.0780.11660.0014188519189527190522
    271153420.19640.33270.00335.2910.0710.11530.0014185218186725188521
    282627600.11220.34650.00345.7190.0770.11970.0014191819193426195221
    29472110.27150.22120.00222.5970.0370.08510.0011128813130019131925
    302748110.18060.33610.00335.3020.0720.11440.0014186819186925187021
    31671950.43720.32180.00325.3040.0740.11950.0015179818186926194922
    321265520.35280.22440.00222.6550.0370.08580.0011130513131618133424
    33862930.40510.27820.00273.9860.0560.10390.0013158316163123169523
    342397320.10510.33020.00325.2090.0710.11440.0014183918185425187122
    351143130.82600.31730.00314.9560.0670.11330.0014177617181225185322
    36892780.27110.31320.00314.8500.0680.11230.0014175718179425183722
    37431220.51460.32770.00325.2430.0740.11600.0015182718186026189622
    38341330.85330.22330.00222.6150.0410.08490.0012129913130520131428
    39275930.53040.04320.00040.31240.00650.05250.00102723276630845
    40245210.54000.04320.00040.31240.00730.05240.00122733276630451
    41572450.44160.21930.00212.5450.0360.08420.0011127812128518129725
    42641640.77680.33570.00335.4270.0800.11730.0015186618188928191524
    433119300.19760.32950.00325.0930.0680.11210.0013183618183525183421
    441255410.25670.22900.00232.7110.0370.08590.0010132913133118133523
    451273160.74510.34200.00345.5650.0750.11800.0014189619191126192721
    463038790.06480.34590.00336.1270.0830.12850.0015191518199427207721
    471646280.16750.25970.00253.7340.0500.10430.0013148814157921170222
    48713180.13460.22570.00222.7500.0390.08840.0011131213134219139024
    491043840.27920.25810.00263.6200.0500.10170.0012148015155422165623
    502069140.36040.21300.00283.2620.0510.11110.0014124516147223181722
    51132550.68050.04300.00040.30810.0110.05190.00172723273928376
    52962520.49240.33810.00335.4680.0740.11730.0014187818189625191521
    531573400.17160.43640.00429.5400.130.15860.0019233423239132244020
    541375660.38660.22590.00222.7080.0370.08690.0010131313133118135923
    55974030.25340.23310.00242.8470.0400.08860.0011135114136819139523
    561976520.29750.27910.00294.5710.0680.11880.0015158716174426193823
    571363520.57260.32460.00325.7340.0790.12810.0016181218193627207221
    587913860.14930.05920.00060.44420.00690.05450.00083714373639032
    59143150.39660.04300.00040.30910.00960.05220.00162713274829369
    603058310.03440.36280.00377.6380.110.15270.0018199621218930237620
    样品号14ELT3
    612045430.55560.33720.00345.4100.0730.11640.0014187319188626190121
    62994530.21330.22150.00222.5960.0360.08500.0010129013130018131623
    631799100.22860.19590.00282.3640.0390.08750.0010115317123220137223
    641426510.17980.22220.00232.6200.0360.08550.0010129413130618132723
    653068330.63490.33390.00345.2240.0700.11350.0013185719185725185621
    662767980.32710.33370.00335.2700.0700.11450.0013185618186425187321
    671687300.34640.22680.00232.6820.0360.08580.0010131813132418133322
    681064660.26130.22770.00232.6910.0370.08570.0010132213132618133223
    692236300.21500.34580.00355.7590.0790.12080.0014191519194026196821
    702229930.16730.22840.00222.6880.0360.08540.0010132613132518132423
     注:灰色阴影部分为不和谐数据
    下载: 导出CSV

    表  2   三面井组和额里图组砂岩碎屑锆石Lu-Hf 同位素组成

    Table  2   Lu-Hf isotopic compositions of detrital zircons for sandstonesfrom the Sanmianjing Formation and Elitu Formation

    样品号年龄/Ma176Yb/177Hf176Lu/177Hf176Hf/177HfεHf(0)εHf(t)TDM/MaTDM2/MafLu/Hf
    14SMJ4.118720.00760.00020.2815480.000023-43.3-1.923402631-0.99
    14SMJ4.22800.05280.00210.2824440.000024-11.6-5.811791667-0.94
    14SMJ4.318650.00880.00030.2816520.000020-39.61.522052415-0.99
    14SMJ4.425190.03070.00090.2811730.000022-56.5-1.628923113-0.97
    14SMJ4.519540.02660.00080.2816060.000021-41.21.322962500-0.98
    14SMJ4.625160.01170.00040.2811140.000023-58.6-2.929303185-0.99
    14SMJ4.719090.01350.00040.2815270.000022-44.0-2.023762665-0.99
    14SMJ4.820970.03010.00090.2813760.000031-49.4-3.826132920-0.97
    14SMJ4.925360.01590.00050.2811650.000020-56.8-0.928743080-0.98
    14SMJ4.103050.03910.00150.2821110.000021-23.4-17.016302386-0.95
    14SMJ4.1118280.00160.00000.2815160.000016-44.4-3.823722715-1.00
    14SMJ4.123660.02030.00090.2819140.000016-30.4-22.618782778-0.97
    14SMJ4.1318540.01190.00040.2814640.000018-46.3-5.524632838-0.99
    14SMJ4.143690.01670.00070.2818790.000017-31.6-23.719142850-0.98
    14SMJ4.1525130.00900.00040.2811560.000016-57.2-1.528753098-0.99
    14SMJ4.1618840.02430.00090.2815510.000018-43.2-2.323762668-0.97
    14SMJ4.1719540.01050.00040.2814830.000015-45.6-2.524372735-0.99
    14SMJ4.1818990.01320.00050.2815100.000017-44.6-2.924062717-0.99
    14SMJ4.1918760.01760.00060.2815010.000023-45.0-3.924262760-0.98
    14SMJ4.2019060.02410.00070.2815030.000016-44.9-3.324312747-0.98
    14SMJ4.2118990.01610.00050.2814930.000020-45.2-3.624312756-0.98
    14SMJ4.2219190.01220.00040.2813670.000018-49.7-7.425913007-0.99
    14SMJ4.2319340.02830.00090.2815930.000021-41.70.323172546-0.97
    14SMJ4.2425080.03120.00100.2812380.000023-54.30.228132993-0.97
    14SMJ4.2518460.02100.00060.2815380.000021-43.6-3.223742695-0.98
    14SMJ4.2627110.02060.00070.2810520.000017-60.8-1.330393238-0.98
    14SMJ4.2718070.01080.00040.2815090.000023-44.7-4.924022769-0.99
    14SMJ4.2818850.02880.00080.2814870.000026-45.4-4.524602804-0.97
    14SMJ4.2918000.00300.00010.2812970.000015-52.2-12.226673212-1.00
    14SMJ4.3025070.02560.00080.2811600.000024-57.0-2.229023139-0.98
    14ELT3.113070.02930.00100.2817460.000022-36.3-8.221152592-0.97
    14ELT3.212580.03200.00100.2817270.000028-37.0-9.921382660-0.97
    14ELT3.318330.02630.00080.2816960.000025-38.11.821732376-0.98
    14ELT3.42710.04580.00140.2821690.000035-21.3-15.715452276-0.96
    14ELT3.519750.03600.00110.2817050.000026-37.74.821782297-0.97
    14ELT3.62750.04410.00140.2821950.000030-20.4-14.615082215-0.96
    14ELT3.713470.03050.00100.2818400.000024-33.0-4.019832360-0.97
    14ELT3.820270.01920.00060.2815510.000027-43.21.323572557-0.98
    14ELT3.918350.02340.00080.2815740.000019-42.4-2.423362638-0.98
    14ELT3.1024540.01870.00070.2814970.000031-45.18.824352423-0.98
    14ELT3.1112990.04820.00160.2817790.000023-35.1-7.821022557-0.95
    14ELT3.122730.03960.00140.2822710.000022-17.7-12.014002047-0.96
    14ELT3.1318850.02410.00090.2816330.000021-40.30.722602484-0.97
    14ELT3.1419520.03780.00140.2816840.000024-38.53.222252382-0.96
    14ELT3.1513190.04080.00140.2818330.000024-33.2-5.220172416-0.96
    14ELT3.1619490.01630.00070.2815810.000021-42.10.523202545-0.98
    14ELT3.1716950.03010.00110.2817600.000023-35.80.721002338-0.97
    14ELT3.1818530.02610.00090.2814780.000023-45.8-5.724782849-0.97
    14ELT3.192720.03980.00140.2821820.000021-20.9-15.215272246-0.96
    14ELT3.2012970.02440.00090.2819110.000024-30.4-2.418792226-0.97
    14ELT3.2120770.00850.00030.2814680.000024-46.1-0.224502682-0.99
    14ELT3.222720.03840.00120.2823220.000030-15.9-10.213231934-0.96
    14ELT3.2319150.02850.00090.2816960.000030-38.03.521752330-0.97
    14ELT3.2424400.01330.00040.2811900.000022-56.0-2.028333074-0.99
    14ELT3.252710.03360.00110.2824610.000026-11.0-5.311241623-0.97
    14ELT3.263710.01920.00060.2820940.000028-24.0-16.016132371-0.98
    14ELT3.2719680.02300.00080.2814970.000025-45.1-2.324432729-0.98
    14ELT3.2813320.03910.00120.2815110.000027-44.6-16.224533104-0.96
    14ELT3.2919010.03850.00120.2817430.000023-36.44.421322266-0.96
    14ELT3.3018560.01600.00050.2815280.000029-44.0-3.223792701-0.99
    下载: 导出CSV
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  • 收稿日期:  2016-11-13
  • 修回日期:  2017-01-23
  • 网络出版日期:  2023-08-15
  • 刊出日期:  2017-02-28

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