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    西藏冈底斯西段鲁尔玛晚三叠世二长闪长岩的成因

    刘洪 张林奎 黄瀚霄 李光明 欧阳渊 吕梦鸿 刘函 兰双双 闫国强

    刘洪, 张林奎, 黄瀚霄, 李光明, 欧阳渊, 吕梦鸿, 刘函, 兰双双, 闫国强, 2019. 西藏冈底斯西段鲁尔玛晚三叠世二长闪长岩的成因. 地球科学, 44(7): 2339-2352. doi: 10.3799/dqkx.2019.051
    引用本文: 刘洪, 张林奎, 黄瀚霄, 李光明, 欧阳渊, 吕梦鸿, 刘函, 兰双双, 闫国强, 2019. 西藏冈底斯西段鲁尔玛晚三叠世二长闪长岩的成因. 地球科学, 44(7): 2339-2352. doi: 10.3799/dqkx.2019.051
    Liu Hong, Zhang Linkui, Huang Hanxiao, Li Guangming, Ouyang Yuan, Lü Menghong, Liu Han, Lan Shuangshuang, Yan Guoqiang, 2019. Petrogenesis of Late Triassic Luerma Monzodiorite in Western Gangdise, Tibet, China. Earth Science, 44(7): 2339-2352. doi: 10.3799/dqkx.2019.051
    Citation: Liu Hong, Zhang Linkui, Huang Hanxiao, Li Guangming, Ouyang Yuan, Lü Menghong, Liu Han, Lan Shuangshuang, Yan Guoqiang, 2019. Petrogenesis of Late Triassic Luerma Monzodiorite in Western Gangdise, Tibet, China. Earth Science, 44(7): 2339-2352. doi: 10.3799/dqkx.2019.051

    西藏冈底斯西段鲁尔玛晚三叠世二长闪长岩的成因

    doi: 10.3799/dqkx.2019.051
    基金项目: 

    中国地质调查项目 DD20190542

    中国地质调查项目 DD20190147

    国家重点研发计划项目 2016YFC0600308

    国家重点研发计划项目 SQ2018YFC060162

    中国地质调查项目 DD20160015

    详细信息
      作者简介:

      刘洪(1987-), 男, 工程师, 硕士, 主要从事矿床学、矿产勘查研究

      通讯作者:

      黄瀚霄

    • 中图分类号: P581

    Petrogenesis of Late Triassic Luerma Monzodiorite in Western Gangdise, Tibet, China

    • 摘要: 晚三叠世及以前岩浆活动研究的缺乏严重制约了雅鲁藏布新特提斯洋演化模式的讨论.为探讨冈底斯西段打加错地区晚三叠世岩浆活动的地球动力学背景,对鲁尔玛二长闪长岩开展了岩石学、地球化学和年代学研究工作.利用LA-ICP-MS方法测得2件二长闪长岩样品的锆石206Pb/238U年龄加权平均值为212.1±0.6 Ma(MSWD=0.97)和212.8±0.2 Ma(MSWD=0.74),表明鲁尔玛中性岩浆活动发生在晚三叠世.二长闪长岩主要由斜长石、钾长石、普通角闪石等组成,并含少量石英、普通辉石、黑云母、磁铁矿、磷灰石等,具有中等的SiO2(50.75%~54.69%)含量,高的K2O(2.71%~3.99%)和总碱(K2O+Na2O=5.84%~8.65%)含量,以及中等的A12O3(13.77%~19.17%)含量,较高的CaO(4.90%~10.14%)含量.里特曼指数(σ43)为3.40~7.65,A/CNK值为0.56~1.00,表明鲁尔玛二长闪长岩属于准铝质钾玄岩系列岩石.岩石富集轻稀土元素(LREE)和大离子亲石元素(LILE),相对亏损重稀土元素和高场强元素(HFSE),轻重稀土分异较弱(LREE/HREE=7.45~11.10),并具轻微的Eu负异常(δEu=0.83~0.95),无Ce异常(0.93~1.04).相对较低的87Sr/86Sr初始比值((87Sr/86Sr)t=0.705 532~0.706 135,平均0.705 852)、正的εHf(t)值(4.97~14.10,平均8.77)、年轻的地壳模式年龄(TDM2=348~930 Ma,平均为686 Ma),(143Nd/144Nd)tεHf(t)分别为0.512 639~0.512 669(平均为0.512 657)和0.08~0.67(平均为0.43),(206Pb/204Pb)t、(207Pb/204Pb)t和(208Pb/204Pb)t分别为:18.235~18.521(平均为18.411)、15.593~15.651(平均为15.617)和39.948~38.579(平均为38.401),指示二长闪长岩起源于新生地壳.Sr-Nd-Pb-Hf同位素及微量元素特征表明鲁尔玛二长闪长岩为新生地壳部分熔融的产物.研究结果揭示,鲁尔玛二长闪长岩体是晚三叠雅鲁藏布新特提斯洋北向俯冲初期,新生地壳熔融形成的准铝质碱性钾玄岩系岩石.该岩体的研究表明,在晚三叠世(~213 Ma),冈底斯西段的打加错地区,雅鲁藏布新特提斯洋壳已经向北俯冲到南拉萨微陆块之下.

       

    • 图  1  拉萨地块大地构造与岩浆岩分布简图

      刘洪等(2019a)修改

      Fig.  1.  Tectonic map of Lhasa terrane

      图  2  鲁尔玛地区地质简图

      刘洪等(2019b)修改

      Fig.  2.  Geological map of the Luerma

      图  3  晚三叠世鲁尔玛岩体野外及镜下特征

      a.二长闪长岩野外照片; b.二长闪长岩露头照片;c, d.二长闪长岩镜下照片; βυP2.早二叠世辉绿岩; δηΤ3.晚三叠世二长闪长岩; ηοπΤ3.石英二长斑岩; P1a.下二叠统昂杰组角岩化砂岩; Pl.斜长石; Kfs.钾长石; Hb.角闪石; Qz.石英

      Fig.  3.  Petrographic characteristics of the monzodiorite in Luerma

      图  4  QAP图解(a);K2O+Na2O-SiO2图解(b);K2O-SiO2图解(c);A/NK-A/CNK图解(d)

      图a底图据Le Maitre (2002);图b底图据Middlemost (1994);图c底图据Peccerillo and Taylor (1976)Middlemost (1985);图d底图据Maniar and Piccoli (1989)

      Fig.  4.  QAP plot (a); K2O+Na2O-SiO2 plot (b); K2O vs. SiO2 plot (c); A/NK vs. A/CNK plot (d)

      图  5  稀土元素标准化曲线(a)和微量元素标准化蛛网图(b)

      图a标准化数据数据McDonough and Sun (1995);图b标准化数据数据Sun and McDonough (1989)

      Fig.  5.  Chondrite-normalised REE patterns (a); mantle-normalised multi-element diagrams (b)

      图  6  鲁尔玛二长闪长岩LEM41样品(a, b)和ZK03-23样品(c, d)锆石U-Pb年龄谐和图

      Fig.  6.  U-Pb zircon concordia plots for LEM41 (a, b) and ZK03-23 (c, d) from Luerma

      图  7  鲁尔玛二长闪长岩构造环境图解

      a. Na/La-La/Sm图解; b. Ti-Zr图解,底图据Pearce and Cann(1973) ; c. Nb/Yb-Th/Yb图解,底图据Pearce (2008)

      Fig.  7.  Structural environment diagram of the monzodiorite in Luerma

      图  8  εHf(t)与年龄关系

      南拉萨、中拉萨和北拉萨数据据Hou et al.(2015);DM.原始地幔; CHUR.球粒陨石均一储库

      Fig.  8.  εHf(t) vs. U-Pb ages plots

      图  9  鲁尔玛岩体Sr-Nd-Pb图解

      EMⅠ. Ⅰ型富集地幔; EMⅡ. Ⅱ型富集地幔; PREMA.普通地幔; BSE.整个硅酸盐地球; HIMU.高μ地幔; Geochron.零等时线; NHRL.北半球参考线; *数据据Xu and Castillo (2004)Zhang et al.(2005);底图据Zindler et al. (1986)Wilson (1989)

      Fig.  9.  Sr-Nd-Pb plots of Luerma

      图  10  鲁尔玛二长闪长岩成因模式

      a.晚三叠世板块构造图, 据Baxter et al.(2016)Li et al.(2016)Cao et al.(2018)修改; b.鲁尔玛晚三叠世岩浆岩形成模式

      Fig.  10.  Schematic illustration showing the generation and emplacement to the monzodiorite in Luerma

      表  1  鲁尔玛二长闪长岩采样分布

      Table  1.   The sample distributions of the Luerma monzodiorite

      样品编号 采样位置 分析项目
      东经E 北纬N
      LEM08 85°42’30” 30°01’34” 薄片鉴定,全岩主量、稀土、微量元素分析,全岩Sr-Pb-Pb同位素分析
      LEM12 87°42’29” 30°02’09” 薄片鉴定,全岩主量、稀土、微量元素分析
      LEM13 87°42’30” 30°02’09” 薄片鉴定,全岩主量、稀土、微量元素分析
      LEM15 87°42’32” 30°02’10” 薄片鉴定,全岩主量、稀土、微量元素分析
      LEM17 87°42’41” 30°02’08” 薄片鉴定,全岩主量、稀土、微量元素分析,全岩Sr-Pb-Pb同位素分析
      LEM26-1 87°43’00” 30°02’30” 薄片鉴定,全岩主量、稀土、微量元素分析,全岩Sr-Pb-Pb同位素分析
      LEM41 85°42’39” 30°02’05” 薄片鉴定,全岩主量、稀土、微量元素分析,全岩Sr-Pb-Pb同位素分析锆石U-Pb测年、Lu-Hf同位素分析
      ZK03-23 85°43’23” 30°02’31” 薄片鉴定,全岩主量、稀土、微量元素分析,锆石U-Pb测年、Lu-Hf同位素分析
      下载: 导出CSV
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    • 收稿日期:  2019-01-31
    • 刊出日期:  2019-07-15

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