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内蒙古东部央格力雅山中酸性岩地球化学特征、锆石U-Pb年龄及地质意义

王嘉星, 肖亮, 姜魁, 黄新华, 张顺新, 宁勇云, 谢彪武, 刘伟, 唐志祥

王嘉星, 肖亮, 姜魁, 黄新华, 张顺新, 宁勇云, 谢彪武, 刘伟, 唐志祥. 2019: 内蒙古东部央格力雅山中酸性岩地球化学特征、锆石U-Pb年龄及地质意义. 地质通报, 38(9): 1455-1468.
引用本文: 王嘉星, 肖亮, 姜魁, 黄新华, 张顺新, 宁勇云, 谢彪武, 刘伟, 唐志祥. 2019: 内蒙古东部央格力雅山中酸性岩地球化学特征、锆石U-Pb年龄及地质意义. 地质通报, 38(9): 1455-1468.
WANG Jiaxing, XIAO Liang, JIANG Kui, HUANG Huaxin, ZHANG Shunxin, NING Yongyun, XIE Biaowu, LIU Wei, TANG Zhixiang. 2019: Geochemical characteristics, zircon U-Pb ages and geological implications of the eastern Innermongolia in Yanggeliya Mountain intermediate-acid rock. Geological Bulletin of China, 38(9): 1455-1468.
Citation: WANG Jiaxing, XIAO Liang, JIANG Kui, HUANG Huaxin, ZHANG Shunxin, NING Yongyun, XIE Biaowu, LIU Wei, TANG Zhixiang. 2019: Geochemical characteristics, zircon U-Pb ages and geological implications of the eastern Innermongolia in Yanggeliya Mountain intermediate-acid rock. Geological Bulletin of China, 38(9): 1455-1468.

内蒙古东部央格力雅山中酸性岩地球化学特征、锆石U-Pb年龄及地质意义

基金项目: 

内蒙古自治区地质勘查基金 NMKD2014-26

详细信息
    作者简介:

    王嘉星(1995-), 男, 在读硕士生, 矿物学、岩石学、矿床学专业。E-mail:wangjxcugb@163.com

    通讯作者:

    姜魁(1983-), 男, 硕士, 工程师, 地球探测与信息技术专业, 从事地质矿产勘查工作。E-mail:jiangkui@163.com

  • 中图分类号: P588.12;P597+.3

Geochemical characteristics, zircon U-Pb ages and geological implications of the eastern Innermongolia in Yanggeliya Mountain intermediate-acid rock

  • 摘要:

    内蒙古东部央格力雅山岩体岩性为正长花岗岩、二长花岗岩和英云闪长岩。正长花岗岩U-Pb年龄为130.4±1.1Ma,英云闪长岩U-Pb年龄为126.6±3.0Ma、二长花岗岩锆石U-Pb年龄分别为131.6±1.1Ma和130.7±1.5Ma,显示岩体侵位时间为早白垩世。地球化学研究表明,该花岗岩体具有富硅、富碱、贫钙的特征,属准铝质-过铝质高钾钙碱性系列岩石;稀土元素总量较低、轻重稀土元素分馏明显,(La/Nb)N值在9.14~24.86之间、正Eu异常显著(δEu值为1.03~1.53);微量元素K、La、Sr、Gd等明显富集,Nb、Pr、P、Ti等亏损;大离子亲石元素相对高场强元素富集。岩石分异指数平均为80.63,岩石成因类型属高分异I型花岗岩,岩浆来源于下地壳岩石的部分熔融,形成于伸展环境,与古太平洋板块俯冲作用密切相关。

    Abstract:

    The Yanggeliya Mountain is located in the Oroqen Autonomous Banner, Hulunbuir City, eastern Inner Mongolia. Syenogranite, monzoniticgranite and tonalite are the main rocks, and the LA-ICP-MS zircon U-Pb age indicates that the emplacement time is Early Cretaceous (130.4 ±1.1Ma) for syenogranite, 126.6 ±3.0Ma for monzoniticgranite, 131.6 ±1.1Ma and 130.7±1.5Ma for tonalite. The study of rock geochemistry shows that the granite body is characterized by rich silicon and alkali, and depletion of calcium, belonging to the quasi-aluminum-peraluminous, high-potassic, calcium-alkali series of rocks. The total amount of rare earths is relatively low, the fractionation between LREE and HREE is obvious, and the (La/Nb)N values are between 9.14 and 24.86. The Eu has obvious positive anomalies (the δEu values are in the range of 1.03~1.53). As for trace elements, the values of K, La, Sr and Gd are obviously enriched, whereas Nb, Pr, P and Ti are depleted. Large ionic lithophile elements are enriched with relatively high field strength elements. The rock differentiation index DI averages 80.63. The above characteristics are similar to those of highly differentiated I-type granites. The source of magma was the crust-derived magma series, which was the product of the partial melting of continental crust rock, and the tectonic setting was a stretching environment which was closely related to subduction of ancient Pacific plate.

  • 蛇绿岩是一种可与现代大洋岩石圈对比的镁铁-超镁铁质岩石组合,在古洋消减、大陆造山带形成过程中,以构造侵位的方式产在造山带中,作为重大地质界线和板块缝合边界受到地学界的广泛关注[1],可以为古板块构造格局恢复、造山带演化、变形作用过程重建、深源成矿作用等研究提供重要信息,被广泛应用于全球板块构造系统研究,是目前人类探测地球深部物质组成的最好窗口[2-6]

    北疆地区东准噶尔造山带位于阿尔泰造山带和天山造山带之间,其古生代以来的大地构造演化是显生宙亚洲大陆增长和古亚洲洋演化的重要阶段,同时也涉及当今有关大陆造山带模型等重要理论问题[7-14]。然而东准噶尔构造带古生代以来的构造演化迄今未形成共识,尤其是对其中的蛇绿岩时代、构造属性、就位环境等存在争议[9-11, 14-18]。东准噶尔造山带大地构造相解剖表明[9-13, 19],自北向南由一系列岛弧杂岩带和增生楔杂岩组成,其大地构造相自北向南大致包括都拉特复合岛弧、阿尔曼太蛇绿岩、野马泉复合岛弧、卡拉麦里蛇绿岩、将军庙增生杂岩,研究区集中于争议较大的阿尔曼太蛇绿岩带(图 1),通过对蛇绿岩中基性岩块的岩石学和地球化学研究,探讨其岩石成因及地质意义。

    图  1  阿尔曼太蛇绿岩分布略图
    Q—第四系;O1—2Q—青河岩群;O3bs—晚奥陶世巴斯他乌组;D1t—早泥盆世托让格库都克组;D1k—早泥盆世康布铁堡组;D2k—中泥盆世库鲁木迪组;D2b—中泥盆世巴尔雷克组;D3kx—晚泥盆世卡希翁组;D3C1j—晚泥盆世-早石炭世江孜尔库都克组;C1j—早石炭世姜巴斯套组;C2b—中石炭世巴塔玛依内山组;Σ—札河坝-阿尔曼太蛇绿岩;γδοD—泥盆纪英云闪长岩;γβC—石炭纪黑云母花岗岩;ξγC—石炭纪正长花岗岩
    Figure  1.  Distribution map of Armantai ophiolite

    前人研究认为,阿尔曼太蛇绿岩为SSZ型蛇绿岩,产于岛弧、弧后盆地等环境,其主要证据在于玄武岩的地球化学特征。分析认为,该区玄武岩Nb相对于Th、La、Ce亏损,稀土元素曲线皆为轻稀土元素(LREE)富集型,且变化范围较宽,说明了幔源的多样性。阿尔曼太蛇绿岩套变质橄榄岩由于强烈蛇纹石化,其主量元素的地球化学意义不大,而堆晶岩成分变化较大,显示了岩浆结晶分离作用的影响,浅成-喷出岩类以辉绿岩、玄武岩和安山玄武岩为主,主体为亚碱性系列[17]

    研究区阿尔曼太蛇绿岩带位于准噶尔盆地东北缘,乌伦古河南侧,西起准噶尔盆地东缘的札河坝附近,向东沿阿尔曼太山,断续延伸到中蒙边境,走向北西西,蛇绿岩带长约200km,宽3~5km。阿尔曼太蛇绿岩带不同区段各单元发育情况不同,出露宽度相差悬殊,最宽处在札河坝一带,变窄处在兔子泉以西,出露只有数十米,甚至缺失。在东段中蒙边境地区以变质玄武岩为主,变质橄榄岩仅零星出露;在阿尔曼太山主脊线一带,蛇绿岩套发育较完整,变质橄榄岩、堆晶辉长岩和辉绿岩、玄武岩、玄武安山岩均有发育,但完好剖面不多见,堆晶岩、辉绿岩一般以残块形式出现;在西段札河坝地区蛇绿岩以发育变质橄榄岩为主,堆晶岩和辉绿岩不及阿尔曼太山主脊线处发育,顶部有具枕状构造、变形强烈的玄武岩。

    本次研究对札河坝-二台蛇绿岩测制了Ⅹ、Ⅺ号剖面(图 2图 3)。剖面控制了岩块、基质的规模、产状、接触关系。从图 2可以看出,札河坝地区蛇绿岩组分较齐全,有(白云石)蛇纹岩、辉长岩、斜长岩、辉绿岩、玄武岩、放射虫硅泥质沉积。各个岩石单元呈断块产出,相互叠置,由于受断裂构造的影响,各块体岩石均破碎严重。剖面测制,均从围岩地层开始,绿岩各岩块均小规模出露,且间隔大片第四系,受比例尺影响,剖面均未能连续穿透。但基本岩石组合已经明确,后续多为重复出现。

    图  2  阿尔曼太蛇绿岩剖面(Ⅹ号实测剖面17~59层)
    1—粉砂岩;2—绢云母板岩;3—放射虫火山灰凝灰岩;4—硅质岩;5—辉绿岩;6—玄武岩;7—长岩;8—蛇纹岩;9—辉石橄榄岩;10—闪长岩;11—斜长花岗岩;12—碳酸盐脉;13—逆冲断层;14—透镜体
    Figure  2.  The section of Armantai ophiolite(the X measured section of 17~59 strata)
    图  3  阿尔曼太蛇绿岩剖面(Ⅺ号实测剖面0~21层)
    1—灰岩;2—白云岩;3—角砾岩;4—粉砂岩;5—长石岩屑砂岩;6—安山质角砾凝灰岩;7—滑石菱铁片岩;8—绢云千糜岩;9—硅质岩;10—辉绿岩;11—辉长岩;12—蛇纹岩;13—闪长岩;14—斜长花岗岩;15—透闪石岩;16—安山玄武岩;17—逆冲断层
    Figure  3.  The section of Armantai ophiolite (the XI measured section of 0~21 strata)

    蛇纹岩一般呈暗灰绿色、黑绿色或黄绿色,色泽不均匀,质软、具滑感,叶片、纤维、纤状变晶结构,块状构造,表面局部可见蛇纹石化石棉。镜下为交代网状结构,主要由蛇纹石(60%~65%)、菱镁矿(20%~25%)和磁铁矿(5%~10%)、滑石(2%~3%)、少量铬尖晶石及极少量透闪石组成。以细粒磁铁矿、菱镁矿集合体为网而以蛇纹石为格(结)组成交代网格结构,表明原始矿物是橄榄石,局部交代强烈被蛇纹石纤状结合体替代网格。其中蛇纹石有2种:一种是无序排列的叶蛇纹石鳞片集合体,一种是平行排列的纤蛇纹石。一般叶蛇纹石排列在内核,而纤蛇纹石排列在外环。菱镁矿呈斑点浸染分布,有时聚集成团块。磁铁矿主要呈细粒集合体网脉状结构,少量集合成磁铁矿粒晶(图 4-ab)。

    图  4  蛇纹岩(a、b)和变质玄武岩(c、d)宏观及显微照片
    Pl—斜长石;Cal—方解石;Tlc—滑石;Srp—蛇纹石;Px—辉石;Mgs—菱镁矿
    Figure  4.  Photos and microphotographs of serpentinite(a, b) and basalt(c, d)

    镁铁质火山岩蚀变相对较弱,岩性为玄武岩,出露面积较大,岩石为灰黑色、青灰色,风化面多为褐色,碎裂结构,块状构造,局部具有残破的枕状构造。镜下为斑状结构,基质具间粒间隐结构。斑晶含量20%~30%,粒径为0.5~3mm,主要由斜长石和辉石组成。斜长石斑晶有2类:一类以绢云母化为主,呈碎屑状或板柱状;一类以钠黝帘石化为主,常呈板柱状,与基质协调。辉石多呈聚晶,多数绿泥石化、方解石化,个别新鲜但内部被交代。基质更复杂,由斜长石、较多蚀变矿物(绿泥石、绿帘石、阳起石和方解石)和极少量石英组成。局部具有典型的间粒间隐结构(图 4-cd)。

    野外样品采自阿尔曼太蛇绿构造岩带,主要对蛇绿岩中具代表性的基性熔岩按路线进行采样,共采集3组样品,其中在阿尔曼太兔子泉地区采集1组样品(AMT06),在阿尔曼太山地区采集2组样品(AMT11、AMT12)。通过镜下岩相学研究,对较新鲜、蚀变弱、无脉体的样品进行了岩石地球化学测试,测试单位为中国地质调查局西安地质调查中心。主量元素的XRF分析在Xios4.0kwX-荧光光谱仪(仪器编号为SX-45)上完成,精度和准确度优于5%;微量和稀土元素采用等离子质谱仪ICP-MS(仪器编号为SX-50)进行分析,分析精度和准确度优于10%,其中样品AMT06、AMT11、AMT12测试结果见表 1

    表  1  阿尔曼太基性岩主量、微量和稀土元素含量
    Table  1.  Major, trace and rare earth elements compositions
    样品SiO2TiO2Al2O3Fe2O3FeOMnOMgOCaONa2OK2OP2O5烧失量总计Mg#CuPbZnCrNiCoLiRbCsMoSrBa
    AMT06-147.110.7715.923.535.190.158.514.853.684.290.25.7999.990.6557.85.2976.140613136.323.417011.80.291.2162
    AMT06-248.120.8517.143.174.850.127.173.934.34.420.215.721000.6361.15.8575.113030.425.328.816410.90.3582.3193
    AMT06-347.90.8817.233.315.10.137.043.963.864.790.225.5799.990.6163.13.0272.213227.525.332.816511.30.6467.8273
    AMT06-447.460.8316.732.985.180.137.584.294.124.490.216.02100.020.6367.63.3873.91815024.229.117211.61.0189.2210
    AMT06-5480.816.573.214.930.147.444.454.343.950.225.96100.010.6371.54.8872.119166.228.926.31469.650.67108175
    AMT06-648.380.816.83.035.190.136.964.744.133.970.25.68100.010.6169.83.6468.425576.429.729.31448.950.5491.2258
    样品VScNbTaZrHfGaUThLaCePrNdSmEuGdTbDyHoErTmYbLuYΣREEδEu
    AMT06-1219264.240.3585.51.8516.90.963.0713.9303.8816.23.640.963.50.513.520.722.020.291.770.2818.981.20.81
    AMT06-223225.74.630.494.12.12180.953.2515.131.74.0416.63.71.053.590.493.710.762.170.3420.3118.885.60.87
    AMT06-324527.44.690.3696.92.0318.20.873.0514.330.94.0117.13.991.083.60.554.070.772.340.322.180.3520.385.60.85
    AMT06-423325.54.640.3589.41.9416.50.9314.230.93.8415.83.881.133.380.533.780.752.230.31.970.3219.3830.93
    AMT06-521224.14.640.494.82.1517.413.415.232.24.0716.83.961.193.660.543.50.762.190.32.020.3319.786.70.94
    AMT06-622426.34.530.3488.11.9417.30.953.2114.330.53.9816.33.741.023.410.533.560.742.160.292.010.2818.682.80.85
    样品SiO2TiO2Al2O3Fe2O3FeOMnOMgOCaONa2OK2OP2O5烧失量总计Mg#CuPbZnCrNiCoLiRbCsMoSrBa
    AMT11-145.241.5512.614.227.930.224.1313.263.930.520.156.1899.940.3993.31.8691.816676.94314.212.21.670.8343139
    AMT11-246.811.7112.673.668.430.214.5311.164.550.230.255.7899.990.4165.20.8698.113776.743.412.26.860.940.421260
    AMT11-348.041.6212.723.398.180.194.8510.824.520.220.235.299.980.4462.81.551011325137.613.15.670.640.8726993.5
    AMT11-445.21.5713.23.389.10.194.6710.94.20.580.196.899.980.4177.41.8410512450.741.11318.62.20.5126693.3
    AMT11-547.451.6512.773.768.080.24.810.984.390.330.245.3499.990.43532.5399.912945.53712.39.30.970.85276113
    AMT11-644.481.6213.14.248.690.214.7611.444.020.580.186.69100.010.41941.810413255.442.213.817.62.180.4823877.8
    AMT11-745.211.5713.83.657.480.18412.544.10.610.26.6499.980.41102.3187.112561.142.813.614.81.960.28353140
    AMT11-845.231.3413.494.135.460.17416.113.30.470.166.1399.990.44891.886195.848.1369.04101.40.24238128
    AMT11-946.421.4410.653.629.450.345.0614.443.220.350.164.8499.990.4262.80.6197.310550.744.812.97.940.920.0917678.2
    样品VScNbTaZrHfGaUThLaCePrNdSmEuGdTbDyHoErTmYbLuYΣREEδEu
    AMT11-130041.31.660.284.92.0215.80.270.143.4110.21.8310.73.971.254.970.816.021.333.960.543.790.5636.653.30.86
    AMT11-231445.82.060.17942.2914.80.240.113.86112.1312.34.511.515.970.957.121.644.780.694.620.745.161.80.89
    AMT11-330846.81.570.09790.52.1713.60.270.113.249.751.7711.64.091.45.320.856.71.544.530.624.250.6241.756.30.91
    样品VScNbTaZrHfGaUThLaCePrNdSmEuGdTbDyHoErTmYbLuYΣREEδEu
    AMT11-431944.61.40.1188.32.0615.10.210.13.069.391.7910.63.961.35.180.86.231.464.350.624.070.63953.40.87
    AMT11-529945.51.510.1189.91.9813.70.310.163.710.51.9711.53.91.295.550.886.781.454.640.664.20.6242.357.60.84
    AMT11-631243.31.440.1490.21.9717.80.230.053.089.41.7310.83.881.185.090.826.081.284.10.63.620.5437.252.20.81
    AMT11-728641.62.530.1596.42.1518.60.270.124.39122.0411.33.931.054.80.745.561.243.830.513.250.4833.655.10.74
    AMT11-826436.92.890.2183.41.7119.50.260.183.8910.41.710.23.220.994.160.674.751.033.270.4930.4429.148.20.82
    AMT11-9301422.740.1980.51.7913.80.240.123.269.381.549.293.7214.390.75.341.163.740.53.310.4833.247.80.75
    样品SiO2TiO2Al2O3Fe2O3FeOMnOMgOCaONa2OK2OP2O5烧失量总计Mg#CuPbZnCrNiCoLiRbCsMoSrBa
    AMT12-147.691.6214.042.19.360.168.568.583.490.20.174.0199.980.5887.31.1999.252828556.824.63.90.330.3309102
    AMT12-248.251.6313.512.248.710.168.868.753.440.310.183.961000.6801.458554026952.425.53.580.330.29282191
    AMT12-347.41.4814.081.787.60.147.279.753.880.580.195.851000.5966.11.048143119246.225.76.150.480.22225439
    AMT12-446.051.212.651.616.450.146.1513.373.541.040.147.6599.990.5876.81.2364.935116138.818.98.170.40.5207122
    0
    AMT12-546.671.5213.993.196.80.147.4313.592.470.210.173.7999.970.581011.3673.645223150.720.73.140.340.2375127
    AMT12-644.581.413.11.868.340.168.1211.852.980.60.166.8399.980.5971.91.281.444321449.228.86.490.560.18234554
    AMT12-745.721.4312.961.627.530.157.1212.523.450.510.186.82100.010.5978.20.9670.44112195021.25.290.280.3270418
    AMT12-947.31.3914.912.857.590.147.311.192.690.340.144.1499.980.5648.11.0579.94222004524.93.660.190.33381273
    样品VScNbTaZrHfGaUThLaCePrNdSmEuGdTbDyHoErTmYbLuYΣREEδEu
    AMT12-126833.214.31.011062.1618.70.320.8511.626.63.6416.54.311.44.950.794.7912.690.442.630.3626.181.70.92
    AMT12-226734.313.61.011042.1617.70.320.8710.824.73.5116.23.791.334.680.754.680.972.680.442.450.3425.477.30.96
    AMT12-323530120.8896.11.9714.50.450.6910.523.23.0914.83.471.114.230.744.540.942.510.412.50.3124.772.40.88
    AMT12-419624.79.290.7875.91.5613.10.30.587.83182.4411.32.741.23.590.593.650.82.10.342.120.2820.5571.17
    AMT12-525329.612.40.9897.22.0617.70.420.749.0221.43.1713.93.611.434.40.724.570.922.540.42.470.3324.468.91.09
    AMT12-623329.4120.8790.31.8315.60.560.6910233.1613.73.521.264.280.694.170.842.250.372.340.3122.769.90.99
    AMT12-722627.4120.93921.7215.40.50.689.7321.83.0114.63.341.194.110.654.290.892.290.422.420.3223.869.10.98
    AMT12-921227.812.60.871042.1321.60.391.099.7623.53.1514.33.411.414.20.674.30.872.330.392.570.2922.971.21.13
    注:Mg#=MgO/(MgO+TFeO)(分子数);主量元素含量单位为%,微量和稀土元素含量单位为10-6
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    样品AMT06 SiO2含量为47.11%~48.38%,平均47.83%;TiO2含量为0.77%~0.88%,平均0.82%,与IAT(0.83%)较接近[20];Al2O3含量为15.92%~17.23%,平均16.73%,与岛弧拉斑玄武岩和板内溢流拉斑玄武岩高Al2O3含量特征相似,后两者分别为16%和17.08%[21],而明显不同于大西洋、太平洋和印度洋中脊拉斑玄武岩的Al2O3含量(分别为15.6%、14.86%、15.15%)[22];MgO含量为6.96%~8.51%,平均7.45%,相对较高;Mg#值为0.61~0.65,平均0.63,接近于原始岩浆成分(0.68~0.75),说明原生岩浆的分异演化较弱。Na2O + K2O含量为7.97% ~8.72%,平均为8.39。在SiO2-Nb/Y图解上,所有样品的Nb/Y值均小于0.7,位于亚碱性系列区;从SiO2-TFeO/MgO图解可以看出,所有样品点位于拉斑系列范围,且样品点非常集中,变化范围小(图 5)。

    图  5  Nb/Y-SiO2图解和SiO2-TFeO/MgO图解
    Figure  5.  Nb/Y-SiO2 and SiO2-TFeO/MgO diagrams

    样品AMT11 SiO2含量为44.08%~48.04%,平均46.01%;TiO2含量为1.34%~1.71%,平均1.56%,与MORB的TiO2(1.5%)较接近[20];Al2O3含量为10.65%~13.80%,平均12.78%,含量较低;MgO含量为4.00%~5.06%,平均4.53%;Mg#值为0.39~0.44,平均0.42,说明原生岩浆发生分异演化。Na2O含量为3.22%~4.55%,平均4.03%;K2O含量为0.22%~0.61%,平均0.43%;Na2O+K2O含量为3.57%~4.78%,平均4.46%。主量元素相对富MgO,贫Al2O3、K2O,Na2O含量大于K2O含量,类似于MORB型岩石。在SiO2-Nb/Y图解上,所有样品的Nb/Y值均小于0.7,位于亚碱性系列区;从SiO2-TFeO/MgO图解可以看出,所有样品点位于拉斑系列范围(图 5)。

    样品AMT12 SiO2含量为44.58%~48.25%,平均46.71%;TiO2含量为1.20%~1.63%,平均1.46%,介于IAT(0.83%)与MORB(1.5%)之间[20],更接近于MORB。Al2O3含量为12.65% ~14.91%,平均13.66%,近于大西洋、太平洋和印度洋中脊拉斑玄武岩的Al2O3含量(分别为15.6%、14.86%、15.15%)[21],明显不同于岛弧拉斑玄武岩和板内溢流拉斑玄武岩高Al2O3含量特征,后两者分别为16%和17.08%[22];MgO含量为6.15%~8.86%,平均7.60%,较高;Mg#值为0.56~0.60,平均0.58%,低于原始岩浆成分(0.68~0.75),说明原生岩浆发生较弱的分异演化。Na2O含量为2.47%~3.88%,平均3.24%;K2O含量为0.20%~1.04%,平均0.47%;Na2O+K2O含量为2.68%~4.58%,平均3.72%。在SiO2-Nb/Y图解上,所有样品的Nb/Y值均小于0.7,位于亚碱性系列区;从SiO2-TFeO/MgO图解可以看出,所有样品点位于拉斑系列范围(图 5)。

    AMT06样品的稀土元素总量(∑REE)较高,为81.19×10-6~86.72×10-6,平均为84.14×10-6,轻、重稀土元素比值(LREE/HREE)在2.07~2.24之间,(La/Yb)N=4.46~5.33,(La/Sm)N=2.24~2.55,(Gd/Yb)N=1.34~1.60,表明轻稀土元素富集而重稀土元素亏损,轻、重稀土元素分馏明显,轻稀土元素组内部的元素分馏程度较重稀土元素分馏强。在球粒陨石标准化配分模式图(图 6)中,配分曲线右倾,强烈富集轻稀土元素,Eu显示弱的负异常(δEu值为0.81~ 0.94,平均0.87)。原始地幔标准化微量元素蛛网图(图 6)显示,大离子亲石元素Rb和K富集,Sr强烈亏损,而高场强元素相对亏损,具有较强的负Nb异常和较弱的Hf、Ti负异常,Zr、Sm显示为较弱的正异常。

    图  6  稀土元素球粒陨石标准化配分图解[23]和微量元素原始地幔标准化配分图解[23]
    Figure  6.  Chondrite-normalized REE patterns and primitive mantle normalized trace element patterns

    AMT11样品的∑REE较高,为47.81×10-6~61.78×10-6,平均为53.98×10-6,LREE/HREE值在0.48~0.65之间,(La/Yb)N=0.51~0.92,(La/Sm)N=0.48~0.75,(Gd/Yb)N=1.01~1.19,表明轻稀土元素亏损而重稀土元素富集,轻、重稀土元素分馏不明显,轻稀土元素内部的元素分馏程度较重稀土元素分馏弱。从球粒陨石标准化配分模式图(图 6)可以看出,轻稀土元素亏损,而重稀土元素呈平坦型分布,稀土元素配分模式与洋脊拉斑玄武岩稀土元素配分曲线相似,Eu显示弱负异常(δEu值为0.71~0.91,平均0.83)。在原始地幔标准化的微量元素蛛网图(图 6)上,大离子亲石元素Rb、Ba、U和K富集,Sr弱亏损,高场强元素显示Nb、P等的负异常。高场强元素分异不明显,显示岛弧岩浆的特征,说明该玄武岩的形成与板块俯冲有关。

    AMT12样品的∑REE较高,为56.98×10-6~81.70×10-6,平均为70.92×10-6,LREE/HREE值在1.28~1.46之间,(La/Yb)N=2.48~3.00,(La/Sm)N=1.56~1.89,(Gd/Yb)N=1.32~1.55,表明轻稀土元素富集而重稀土元素亏损,轻、重稀土元素之间分馏明显,轻稀土元素组内部的元素分馏程度较重稀土元素分馏强。球粒陨石标准化配分模式图(图 6)显示,配分曲线右倾,强烈富集轻稀土元素,Eu无明显异常(δEu值为0.88~1.17,平均1.02)。在原始地幔标准化微量元素蛛网图(图 6)上,大离子亲石元素Rb、Th和K亏损,Ba、U具正异常,而高场强元素相对亏损,具有较强的正Ta异常和较弱的负Hf异常,Hf、Sm显示为较弱的正异常。

    在基性熔岩的TiO2- MnO×10-P2O5×10图解(图 7)中,AMT06样品点主要落入钙碱性玄武岩(CAB)和岛弧拉斑玄武岩(IAT)分界线区域,AMT11、AMT12总体落入洋中脊玄武岩(MORB)区域,其中AMT12样品点大部分落入MORB,少数有从IAT到MORB的过渡趋势。在Nb/La-(Th/Nb)N图解(图 8-a)中,除AMT12样品外,其余样品Nb/La值均小于1,且除AMT11和AMT12以外,其余样品(Th/Nb)N值均大于1。以上特征显示,除AMT12样品外,AMT06和AMT11样品均遭受地壳不同程度的混染。在基性熔岩Zr-Zr/Y图解(图 8-b)中,AMT06和AMT12样品点主要投在板内玄武岩(WPB)及与MORB的边界区域,Zr及Zr/Y值(65.70×10-6~119.00×10-6, 3.00~5.36)与大陆玄武岩(Zr>70×10-6, Zr/Y>3)相符。AMT11样品点均落入洋中脊玄武岩区域和岛弧玄武岩区域,并具有过渡的趋势,Zr及Zr/Y值(40.90×10-6~122.00×10-6, 1.84~3.02)与岛弧玄武岩(Zr < 130×10-6, Zr/Y < 4)相符[24]。在此基础上,基性熔岩的Th-Ta-Hf/3(图 9-a)和Nb×2-Zr/4-Y(图 9-b)图解显示,AMT06和AMT11样品点主要投入MORB和IAB区域,反映其与洋中脊和消减带的岛弧环境相关,AMT06样品主要显示岛弧玄武岩特征,而AMT11样品主要显示洋中脊玄武岩特征。AMT12样品点投入板内碱性玄武岩和板内玄武岩区域,表明其与板内拉张有关。

    图  7  TiO2-MnO×10-P2O5×10图解
    CAB—钙碱性玄武岩;IAT—岛弧拉斑玄武岩;MORB—洋中脊玄武岩;OIT—洋岛拉斑玄武岩;OIA—洋岛碱性玄武岩
    Figure  7.  TiO2-MnO×10-P2O5×10 diagram
    图  8  (Th/Nb)N-Nb/La图解(a)和Zr-Zr/Y图解[24](b)
    WPB—板内玄武岩;MORB—洋中脊玄武岩;IAB—岛弧玄武岩
    Figure  8.  (Th/Nb)N-Nb/La(a)and Zr-Zr/Y(b)diagrams
    图  9  基性熔岩Hf/3-Th-Ta(a)和Nb×2-Zr/4-Y(b)图解
    a中:A—N型洋中脊玄武岩;B—E型洋中脊玄武岩和大陆拉斑玄武岩的区分;C—大陆碱性玄武岩和大陆玄武岩的区分;D—消减性板块边缘玄武岩区分;图b中:AⅠ、AⅡ—板内碱性玄武岩;B—P型洋脊玄武岩;AⅡ+C—板内拉斑玄武岩;D—N型洋脊玄武岩;C+D—弧火山岩
    Figure  9.  Hf/3-Th-Ta (a) and Nb×2-Zr/4-Y (b) diagrams of basic lava

    据研究,Ba、Th、Nb、La四个分配系数相近的极不相容元素在海水蚀变或变质过程中较稳定,尤其是它们的比值在部分熔融和分离结晶过程中均保持不变,可最有效地指示源区特征。在基性熔岩La-La/Nb(图 10-a)和Nb-Th/Nb(图 10-b)图解中,AMT06样品点投入IAB区域,AMT11样品点主要投入MORB区域,AMT12样品点位于洋岛玄武岩(OIB)区域或其边界附近,且兼具二者特征或从MORB向IAB过渡的特点。

    图  10  基性熔岩La-La/Nb(a)和Nb -Th/Nb(b)图解
    IAB—岛弧玄武岩;MORB—洋中脊玄武岩;OIB—洋岛玄武岩
    Figure  10.  La-La/Nb (a) and Nb-Th/Nb (b) diagrams of basic lava

    研究区基性熔岩AMT06样品的Nb/La值(平均0.31)与典型的岛弧岩浆岩的Nb/La值(约为0.3)接近或一致,说明AMT06样品具有岛弧玄武岩特征;AMT11样品中,Th/Ta=0.63~1.45,平均值为0.83,La/Ta=17.05~33.64,平均值为24.62,与MORB中Th/Ta =0.75~2,La/Ta=10~20[25]一致,说明AMT11样品的Th/Ta、La/Ta值,更接近SSZ环境对应的比值(Th/Ta=3~5, La/Ta=30~40);AMT12样品Nb/La的平均值为1.24,与洋岛玄武岩Nb/La值(约1.3)接近,说明AMT12样品具有板内洋岛玄武岩特征。

    由此可见,阿尔曼太蛇绿岩中的基性熔岩包括3种类型,即岛弧型玄武岩(AMT06)、洋中脊玄武岩(AMT11)和洋岛玄武岩(AMT12)。其中,OIB是在洋壳俯冲时被刮削下来与其组分一起卷入蛇绿岩带就位形成的,并非蛇绿岩组分;MORB和IAT属于蛇绿岩组成部分,其球粒陨石标准化配分曲线具有轻稀土元素略亏损型的MORB特征和轻稀土元素略富集的IAT特征,原始地幔标准化配分曲线表现为IAT和MORB的双重特点,主量、微量元素判别图解显示,IAT和MORB兼具并呈现过渡的特点,相关微量元素比值特征也显示相似的特征,该特点与阿曼蛇绿岩相似[20]。结合对南智利中这种过渡型蛇绿岩的研究:从洋脊到海沟,蛇绿岩地球化学特征有从MORB向SSZ方向过渡演化的趋势,并且越向海沟,SSZ的特点就越明显[26]。针对这一特性,笔者认为,阿尔曼太蛇绿岩的形成可能介于洋脊到海沟之间的偏海沟区域。

    在基性岩Zr/Nb-Nb/Th图解(图 11-a)中,AMT06样品点主要投在岛弧玄武岩区域(ARC),AMT11样品点主要投入N-MORB的亏损地幔区域,AMT12样品点投在洋底玄武岩(OPB)边界附近。在基性岩Nb/Y-Zr/Y图解(图 11-b)中,样品点均主要落在△Nb线两侧,大多投入介于洋底玄武岩(OPB)的原始地幔(PM)与N-MORB的亏损地幔(DM)之间,指示这些样品可能为相同岩浆体系下演化的产物,且AMT12样品表现出该基性岩形成过程中,分别受到批次熔融(F)和俯冲流体作用的影响。样品在Zr/Nb-Nb/Th图解(图 11-a)中,主要集中在大陆岩石圈(EN)和大陆上地壳(UC)区域,表明其形成与岛弧或陆壳物质的带入密切相关,与岛弧带关系密切。

    图  11  基性岩Zr/Nb-Nb/Th(a)和Nb/Y-Zr/Y(b)图解[27]
    DEP—高度亏损地幔;EN—富集单元,包括上地壳和大陆岩石圈,后者可能具有消减带化学特征;REC—循环单元,包括Em1、Em2和HIMU;HIMU—高(U/Pb)地幔源区;Em1、Em2—富集地幔源区;UC—大陆上地壳;ARC—岛弧产生的玄武岩;N-MORB—洋脊玄武岩;OIB—洋岛玄武岩;OPB—洋底玄武岩;PM—原始地幔;DM—浅部亏损地幔单元。单箭头指示批次熔融(F)和俯冲流体(SUB)作用,△Nb线为地幔柱源区和非地幔柱源区的分界线
    Figure  11.  Zr/Nb-Nb/Th (a) and Nb/Y-Zr/Y (b) diagrams of basic lava

    对阿尔曼太基性熔岩的微量元素比值与不同地幔端元进行对比(表 2),基性熔岩的相关微量元素比值特征显示,其明显介于亏损地幔与大陆地壳之间,反映其来源于亏损地幔,并受到后期地壳物质的混染作用或来自消减残板片析出流体的交代作用,即与板块的俯冲相关。

    表  2  阿尔曼太基性熔岩微量元素比值与不同地幔端元的对比
    Table  2.  Comparative studies of the trace element ratio in lava and different mantle elements
    样品Zr/NbLa/NbBa/NbBa/ThRb/NbTh/NbTh/LaBa/LaTh/U
    原始地幔14.80.949.0770.910.1170.1259.64.1
    亏损地幔30.01.074.3600.360.0700.0704.0
    大陆地壳16.22.2054.01244.700.4400.20025.03.8
    HIMU2.7~5.50.66~0.774.9~6.539~850.30~0.430.078~0.1010.107~0.1336.8~8.73.5~3.8
    Em15.3~11.50.86~1.1911.4~17.8103~1540.88~1.170.105~0.1220.107~0.12813.2~16.94.50~4.86
    Em212.0~15.350.89~1.097.3~11.067~840.59~0.850.111~0.1570.122~0.1638.3~11.3
    阿尔曼太基性熔岩对应不同地幔端元微量元素比值平均值
    阿尔曼太
    基性熔岩
    AMT0620.053.1846.3467.2535.170.690.2214.653.37
    AMT1148.451.8955.12901.456.460.060.0328.920.47
    AMT127.820.8137.75614.860.430.060.0845.562.00
    注:HIMU为高(U/Pb)值地幔端元;Em1、Em2为富集地幔端元1和2;元素含量为平均值;地幔端元数据据贾大成等[28]
    下载: 导出CSV 
    | 显示表格

    (1)阿尔曼太蛇绿岩为以泥盆纪地层为基质,各构造岩块为其组成部分的蛇绿岩带。蛇绿岩中变质橄榄岩、堆晶岩、基性火山岩较发育,代表扩张机制的岩墙群规模很小,札河坝地区硅质岩较发育,并识别出斜长岩和斜长花岗岩岩块。层序组合虽受构造破坏,但从总体看仍是一套组合较完整的蛇绿岩。

    (2)对阿尔曼太蛇绿岩中基性熔岩岩石地球化学特征研究表明,基性熔岩可分为3种类型,即洋岛玄武岩(OIB)、洋中脊玄武岩(MORB)和岛弧玄武岩(IAT)。其中洋岛玄武岩不属于蛇绿岩成分,与地幔柱或热点作用有关,是后期卷入蛇绿岩带随其他组分一同构造就位而成的;基性熔岩主量和微量元素特征揭示,岩浆源于亏损的地幔源区,并且存在消减组分加入的交代作用,表明其成因与俯冲作用有关。

    (3)结合阿尔曼太蛇绿岩构造环境判别图解,基性熔岩显示出IAT和MORB兼具并呈现过渡的特点,推断该蛇绿岩的形成与岛弧相关,其形成可能介于洋脊到海沟之间的偏海沟区域。通过分析基性熔岩的物质来源,指示其可能为相同岩浆体系下演化的产物,并表明其形成与岛弧或陆壳物质的带入密切相关,与岛弧带关系密切。

    致谢: 感谢湖南省地质矿产勘查开发局四一八队姜魁、肖亮工程师等在论文撰写过程中给予的大力支持。
  • 图  1   央格力雅山大地构造背景图(a)和研究区地质简图(b)

    1—第四系冲积层;2—白音高老组;3—玛尼吐组;4—满克头鄂博组;5—卧都河组;6—早白垩世闪长岩;7—早白垩世花岗闪长岩;8—早白垩世正长花岗岩;9—中二叠世正长花岗岩;10—中二叠世花岗闪长岩;11—中二叠世黑云母花岗闪长岩;12—中二叠世闪长岩;13—中二叠世二长花岗岩;14—晚石炭世正长花岗岩;15—早寒武世二长花岗岩;16—花岗斑岩脉;17—安山玢岩脉;18—二长斑岩脉;19—实测断层;20—火山断裂;21—火山口或火山通道;22—采样位置

    Figure  1.   Structural sketch geological map of the Yanggeliya Mountain (a) and geological map of the study area (b)

    图版Ⅰ  

    a、e.英云闪长岩野外照片和镜下照片;b、c、f、g.二长花岗岩野外照片及镜下照片;d、h.正长花岗岩野外照片和镜下照片An—钙长石;Bit—黑云母;Kp—钾长石;Pl—斜长石;Qtz—石英;Hb—角闪石

    图版Ⅰ.  

    图  2   央格力雅山中酸性岩部分阴极发光图像和U-Pb谐和图(年龄单位为Ma)

    Figure  2.   Selected cathodoluminescence (CL) images and U-Pb concordia diagrams of zircons for intermediate-acid rocks in Yanggeliya Mountain

    图  3   央格力雅山中酸性岩R1-R2分类图解(a)、SiO2-K2O图解(b)和A/CNK-A/NK图解(c)

    (a、b、c底图分别据参考文献[22-24])

    Figure  3.   R1 versus R2 for classification diagram (a), SiO2 versus K2O (b) and A/CNK versus A/NK diagrams (c) of Yanggeliya Mountain intermediate-acid rocks

    图  4   央格力雅山中酸性岩哈克图解

    Figure  4.   Harker diagrams of Yanggeliya Mountain intermediate-acid rocks

    图  5   央格力雅山中酸性岩体球粒陨石标准化稀土元素模式图(a)和原始地幔标准化微量元素蛛网图(b)(标准化值据参考文献[25])

    Figure  5.   Chondrite-normalized REE patterns (a) and primitive mantle-normalized trace elements spidegrams (b) for Yanggeliya Mountain intermediate-acid rocks

    图  6   央格力雅山中酸性岩SiO2-Ce(a, 底图据参考文献[41])和La-La/Nb判别图解(b)

    Figure  6.   Discrimination diagrams of SiO2 versus Ce (a) and La versus La/Nb (b) of Yanggeliya Mountain intermediate-acid rocks

    图  7   央格力雅山花岗岩(Nb+Ta)-Rb图解(a)(底图据参考文献[52])和SiO2-lg[CaO/(Na2O+K2O)]图解(b)(底图据参考文献[53])

    Figure  7.   Discrimination diagrams of (Nb+Ta) versus Rb (a) and SiO2 versus lg[CaO/(Na2O+K2O)] (b) of Yanggeliya Mountain intermediate-acid rocks

    图  8   央格力雅山构造演化图

    Figure  8.   Tectonic evolution map of Yanggeliya Mountain

    表  1   央格力雅山中酸性岩全岩主量、微量和稀土元素测试结果

    Table  1   Whole-rock major, trace and rare earth elements data of Yanggeliya Mountain intermediate-acid rocks

    样品编号TW2TW3TW4TW6样品编号TW2TW3TW4TW6
    岩性正长花岗岩英云闪长岩二长花岗岩二长花岗岩岩性正长花岗岩英云闪长岩二长花岗岩二长花岗岩
    SiO273.860.274.469.1Gd1.343.870.83.09
    TiO20.180.650.120.4Tb0.180.610.110.42
    Al2O313.816.914.215.7Dy0.923.450.552.13
    Fe2O31.995.861.833.29Ho0.150.640.090.32
    FeO0.251.830.180.93Er0.51.940.291.02
    MnO0.030.120.030.05Tm0.070.290.040.13
    MgO0.281.880.160.68Yb0.5420.320.88
    CaO1.174.31.562.18Lu0.090.330.050.14
    Na2O3.764.264.244.62ΣREE62.213337.2134
    K2O4.192.343.283.02LREE58.4120.534.9126.4
    P2O50.040.260.020.13HREE3.7913.12.258.14
    烧失量0.182.240.020.21LREE/HREE15.49.1815.515.5
    总计99.6100100100(La/Yb)N18.89.4121.624.7
    Mg#19.732.113.523.8δEu1.531.031.611.19
    R12536173726272137δCe1.051.010.921
    R2408884454574Rb1255711079.1
    A/NK1.281.771.351.44Ba5938895581083
    A/CNK1.070.971.061.05K33720203592890125467
    AR-1.41-7-1.58-2.02Th10.94.767.669.29
    DI89.563.788.281.1U4.11.041.231.18
    TFeO2.057.21.833.89Nb4.379.94.148.43
    TFe2O32.2882.034.32Sr387500552500
    La14.226.29.730.2Ta0.340.550.320.6
    Ce28.755.716.459.9p207839119598
    Pr2.896.641.666.56Ti103749998452586
    Nd10.125.75.8124.3Rb/Sr0.320.110.20.16
    Sm1.664.80.944.01Rb/Nb28.75.7626.69.38
    Eu0.771.510.471.42La/Nb3.242.652.333.58
    注:分异指数(DI) =Qz+Or+Ab+Ne+Lc+Kp;固结指数(SI)=MgO×100/(MgO+FeO+F2O3+Na2O+K2O);碱度率(AR) =[Al2O3+ CaO+(Na2O+K2O)]/[Al2O3+CaO-(Na2O+K2O)];R1=4Si-11(Na+K)-2(Fe+Ti);R2=6Ca+2Mg+Al; 镁指数(Mg#)=100×(MgO/ 40.3044)/(MgO/40.3044+FeOT/71.844);A/NK=Al2O3/(Na2O+K2O), A/CNK=Al2O3/(CaO+Na2O+K2O)
    下载: 导出CSV

    表  2   央格力雅山中酸性岩锆石U-Th-Pb同位素数据

    Table  2   Zircon U-Th-Pb isotope data of the Yanggeliya Mountain intermediate-acid rocks

    测点号含量/10-6Th/U同位素比值年龄/Ma
    PbThU207Pb/206Pb1σ/10-2207Pb/235U1σ/10-2206Pb/238U1σ/10-2207Pb/206Pb207Pb/235U206Pb/238U
    TW2-110.532204020.550.05130.200.14620.560.02070.032549113951322
    TW2-216.524805780.830.04690.160.13450.450.02090.03428212841332
    TW2-315.124805580.860.05260.190.14370.450.02020.033097713641292
    TW2-412.042874680.610.04850.180.13460.510.02020.031248912851292
    TW2-518.145636730.840.05230.190.14130.520.01970.033008113451252
    TW2-67.071352840.470.05370.350.14860.930.02020.0536714614181293
    TW2-725.117899450.830.05010.170.13970.490.02030.032117813341292
    TW2-821.436268040.780.05110.180.14340.560.02030.032568313651292
    TW2-915.153755670.660.04920.180.14160.530.02080.031678513451332
    TW2-1013.884025450.740.05210.220.14070.570.02000.032989813451282
    TW2-1114.142655750.460.04950.200.13860.550.02050.031699413251312
    TW2-1210.872334500.520.04660.190.12930.560.02020.04329612351292
    TW2-1318.004776560.730.05210.180.15140.510.02120.033008014341352
    TW2-148.462023310.610.04820.230.13450.650.02040.0410910712861302
    TW2-159.471853850.480.05220.250.14590.660.02060.0329513913861322
    TW2-1619.705637470.750.05190.190.14910.560.02090.032808314151332
    TW2-1712.433864920.780.05330.230.14480.650.01970.033399813761262
    TW2-1814.033605520.650.05020.190.14190.540.02050.032069213551312
    TW2-1912.042664700.570.05270.210.15090.580.02100.033229314351342
    TW2-2013.403815250.730.05040.190.13650.490.01990.032138513041272
    TW2-2110.462364140.570.04820.190.13670.560.02060.031099913051322
    TW2-2214.034025380.750.04860.180.13430.500.02010.031288912841282
    TW2-2314.353305470.600.04820.190.13730.510.02080.031069413151332
    TW2-2414.093375390.630.04990.190.14070.550.02030.031918913451292
    TW2-2514.863495820.600.04790.190.13400.510.02020.03958912851292
    TW3-12.4964.51030.620.05490.320.14200.790.01950.0440613013571243
    TW3-24.482001591.260.04670.290.11970.680.01890.043514111561212
    TW3-41.9849.684.80.590.05180.440.13070.01040.01900.0527619212591213
    TW3-62.6472.699.90.730.05180.450.13780.980.02070.0727619813191324
    TW3-86.012312350.980.04660.240.12290.650.01950.0427.911911861253
    TW3-95.4197.92260.430.04730.270.13450.820.02080.046513012871322
    TW3-108.672943330.880.04930.240.13210.660.01980.0416111712661272
    TW3-148.181693290.510.05290.210.14110.520.01980.033289113451272
    TW3-1914.423725400.690.05050.160.14060.430.02030.032177913441302
    TW4-19.161873610.520.04820.200.13620.540.02060.0310910113051312
    TW4-213.743065300.580.04830.150.13810.430.02080.031227613141332
    TW4-318.595717140.800.05480.170.15080.510.02000.034677014351272
    TW4-516.434486420.700.04630.150.12980.410.02040.03137412441302
    TW4-611.842564710.540.04870.160.13660.430.02040.032007613041302
    TW4-77.481392990.470.04860.190.13800.510.02080.031329113151332
    TW4-814.154165450.760.04810.170.13310.490.02010.031028512741282
    TW4-923.126538480.770.04690.130.13460.370.02070.0242.76312831322
    TW4-1016.783956520.600.04840.150.13910.450.02080.031206913241332
    TW4-1118.625147350.700.04720.160.13520.500.02070.035814312941322
    TW4-1213.503575270.680.05030.160.13870.450.02010.032097613241282
    TW4-1313.283465240.660.04680.180.13070.530.02020.03399312551292
    TW4-148.441893210.590.05080.210.14550.610.02070.032329613851322
    TW4-1512.743204980.640.05160.190.14140.480.00190.032657913441282
    TW4-1616.894826340.760.04810.140.13520.400.00140.031067212941312
    TW4-1814.203155600.560.04600.160.13000.450.00160.03--12441312
    TW4-198.501833360.550.04960.180.14000.530.00180.031768713351312
    TW4-2018.254386920.630.05220.160.15140.480.00160.032957214341342
    TW4-2113.812915460.530.04580.160.13190.450.00160.03--12641342
    TW4-2220.996107510.810.04890.140.14540.420.00140.031436913841382
    TW4-2311.342504340.580.05140.200.15120.620.00200.032619114351362
    TW4-2416.463936240.630.05180.190.15070.580.00190.032808514351342
    TW4-2515.073105930.520.04670.150.13690.450.00150.03357413041352
    TW6-19.211372640.520.05540.420.16230.01250.00420.06428168153111374
    TW6-213.32463430.720.05020.270.13680.740.00270.0420612613071272
    TW6-314.32574140.620.05010.250.14050.710.00250.0421111913461292
    TW6-426.76295371.170.05280.230.14430.620.00230.033179813761272
    TW6-519.93994810.830.04710.240.13060.650.00240.045411412561282
    TW6-634.27028350.840.04970.170.13840.470.00170.031838013241282
    TW6-717.93304960.670.04710.250.13120.680.00250.045411812561292
    TW6-820.74354760.910.04730.250.12880.640.00250.0464.912212361303
    TW6-915.32674190.640.04780.250.13280.670.00250.048711912761313
    TW6-1116.23194380.730.04780.240.12930.650.00240.0410010912361252
    TW6-1212.62463210.770.05150.280.14700.810.00280.042619413971312
    TW6-1314.72403930.610.04760.210.13970.600.00210.048010913351362
    TW6-1413.62233680.610.05040.250.14940.750.00250.0421311414171383
    TW6-1513.52553680.690.04950.300.14120.770.00300.0416914313471353
    TW6-1615.62774050.680.04770.220.13950.650.00220.038710713361342
    TW6-1722.64805220.920.04880.210.14170.620.02110.0420010213551343
    TW6-1811.91993350.590.04980.290.13610.770.02010.0418713713071283
    TW6-1921.04684970.940.04870.230.14060.690.02080.0413211113461323
    TW6-2021.14305170.830.05470.300.14620.730.01980.043989413961262
    TW6-2112.02093360.620.05090.270.14630.770.02100.0423512413971343
    TW6-2216.83364620.730.04990.240.13520.620.02000.0419111112961283
    TW6-2329.06466141.050.04740.200.13520.540.02080.04788712951322
    TW6-2412.72143610.590.04860.260.13940.760.02090.0412812213271333
    TW6-2519.73724920.760.05070.300.14090.760.02040.0422814013471302
    下载: 导出CSV
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  • 收稿日期:  2018-08-31
  • 修回日期:  2018-11-01
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  • 刊出日期:  2019-09-14

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