|本期目录/Table of Contents|

[1]李鹏,张聪,刘晓瑜,等.西藏多巴地区片麻岩变质演化过程及其地质意义[J].地球科学与环境学报,2016,38(05):601-611.
　LI Peng,ZHANG Cong,LIU Xiao-yu,et al.Metamorphic Evolution Processes and Their Geological Implications of Gneisses from Duoba Area of Tibet[J].Journal of Earth Sciences and Environment,2016,38(05):601-611.
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西藏多巴地区片麻岩变质演化过程及其地质意义(PDF)
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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:
第38卷
期数:
2016年第05期
页码:
601-611
栏目:
基础地质与矿产地质
出版日期:
2016-09-15

文章信息/Info

Title:
Metamorphic Evolution Processes and Their Geological Implications of Gneisses from Duoba Area of Tibet
文章编号:
1672-6561(2016)05-0601-11
作者:
李鹏; 张聪; 刘晓瑜; 杨经绥; 符义稳
1.中国地质科学院地质研究所，北京 100037；2.中国地质科学院国家地质实验测试中心，北京 100083；3.林芝市国土资源局，西藏 林芝 860100
Author(s):
LI Peng;  ZHANG Cong;  LIU Xiao-yu;  YANG Jing-sui;  FU Yi-wen
1. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China; 2. National Research Center for Geoanalysis, Chinese Academy of Geological Sciences, Beijing 100037, China; 3. Linzhi Bureau of Land and Resources, Linzhi 860100, Tibet, China
关键词:
变质作用; 花岗质片麻岩; 温压条件; 新元古代; 锆石年代学; 念青唐古拉岩群; 拉萨地体; 西藏
Keywords:
metamorphism;  granitic gneiss;  pressure-temperature conditions;  Neoproterozoic;  zircon geochronology;  Nyainqentanglha Group;  Lhasa block;  Tibet
分类号:
P588.34
DOI:
-
文献标志码:
A
摘要:
拉萨地体普遍出露一套角闪岩相、局部达麻粒岩相的变质岩系, 以往的区域地质研究普遍认为这套变质岩为拉萨地体的前寒武纪变质基底, 称之为念青唐古拉岩群。尽管现有的研究认为念青唐古拉岩群经历了前寒武纪变质作用，但部分地区仍缺少令人信服的岩石学及地质年代学证据。通过对拉萨地体北部多巴地区出露的片麻岩进行岩石学及矿物学研究，认为其为一套经历角闪岩相变质作用的中级变质岩系，主要岩石类型有云母片岩和含石榴石黑云母斜长片麻岩。矿物电子探针分析表明，组成岩石的石榴石、长石、黑云母等矿物均为变质成因矿物。石榴石无明显核边分带结构，成分相对均一。利用传统矿物对温压计进行了温压条件估算，得到640 ℃～660 ℃和0.60~0.67 GPa的角闪岩相变质温压条件。首次利用LA-ICP-MS方法对该区花岗质片麻岩中的锆石进行年代学研究，得到(847.0±5.7)Ma的新元古代变质年龄，可与该区域念青唐古拉岩群的变质时代对比，为该片麻岩归入念青唐古拉岩群提供了切实可靠的年代学证据。
Abstract:
A suit of metamorphic rocks, which experience amphibolite and partly granulite facies metamorphism exposes on Lhasa block, are recognized as the basement of Lhasa block and named as Nyainqentanglha Group in the former literatures. Although the rocks are thought to be part of Nyainqentanglha Group, however, it is still lack of reliable geochronological data in some area. By means of the petrological and mineralogical investigations on the gneisses exposed in Duoba area of the north part of Lhasa block, it shows that the gneiss suit is composed of mica schist and garnet-bearing plagioclase gneiss, which has experienced amphibolite facies metamorphism. The garnet in the gneiss with homogeneous composition does not have core-rim structure. The traditional mineral-pair geothermobarometer shows that the metamorphic pressure-temperature conditions are 640 ℃-660 ℃ and 0.60-0.67 GPa, which belong to amphibolite facies metamorphism. LA-ICP-MS zircon U-Pb dating technique is used for the first time to date the metamorphic age of the gneiss in Duoba area and yield the Proterozoic metamorphic age of (847.0±5.7)Ma, which can be compared with Nyainqentanglha Group in the area, exhibiting strong evidence that the gneiss in Duoba area is also part of Nyainqentanglha Group.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期:2016-05-03
基金项目:国家自然科学基金项目(41572051);中国地质科学院地质研究所基本科研业务费专项资金项目(J1518);中国地质调查局项目(DD20160022-01)
作者简介:李鹏(1992-),男,河南漯河人,理学硕士研究生,E-mail:913120086@qq.com。
通讯作者:张聪(1983-),男,辽宁沈阳人,副研究员,理学博士,博士后,E-mail:congzhang@pku.edu.cn。
更新日期/Last Update: 2016-09-30