| 东昆仑西段夏日哈木-苏海图早古生代榴辉岩的发现及意义 |
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| 引用本文： | 祁生胜,宋述光,史连昌,才航加,胡继春.东昆仑西段夏日哈木-苏海图早古生代榴辉岩的发现及意义[J].岩石学报,2014,30(11):3345-3356. |
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| 作者姓名： | 祁生胜 宋述光 史连昌 才航加 胡继春 |
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| 作者单位： | 中国地质大学, 北京 100083;青海省地质调查院, 西宁 810012;青海省青藏高原北部地质过程与矿产资源重点实验室, 西宁 810012;北京大学地质系, 北京 100871;青海省地质调查院, 西宁 810012;青海省青藏高原北部地质过程与矿产资源重点实验室, 西宁 810012;青海省地质调查院, 西宁 810012;青海省青藏高原北部地质过程与矿产资源重点实验室, 西宁 810012;青海省地质调查院, 西宁 810012;青海省青藏高原北部地质过程与矿产资源重点实验室, 西宁 810012 |
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| 基金项目： | 本文受中国地质调查局区域地质调查项目(基[2010]矿评02-01-04)资助. |
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| 摘 要： | 1:25万区域地质调查在东昆仑西段昆中断裂以北的北昆仑变质基底中发现了呈构造透镜分布的榴辉岩及其退变质的榴闪岩,沿小灶火-苏海图-夏日哈木-拉宁灶火断续延伸长达20km.榴辉岩经历了强烈的退变质作用,大部分已退变为榴闪岩,由峰期变质矿物组合石榴石+绿辉石+金红石+钛铁矿和后期退变矿物组合普通角闪石(绿色)+斜长石组成,石榴石边缘发育似针状普通角闪石及微粒状斜长石组成的后合成晶结构,形成宽0.15~1cm的"白眼圈"结构.石榴石成分为Alm52-53And4.2Spess0.7-1.2Gros21.7-22Pyrope19-20,绿辉石中硬玉分子量30.14mol%~37.7mol%.估算榴辉岩相变质温压条件P≈20kbar、T≈660~700℃,榴闪岩相退变温压条件P≈7kbar、T≈550℃,岩石经历了明显的降温降压过程.榴辉岩中锆石阴极发光图像显示大部分具有扇形分带或"杉树叶"结构,17颗锆石Th/U极低,在0.007~0.09之间,其(LA-ICP-MS)U-Pb年龄411.1±1.9Ma代表了榴辉岩相峰期变质年龄,结合区域构造岩浆事件,确定本次高压变质的峰期时代为晚志留-早泥盆世,其形成可能与大规模的陆-陆碰撞事件有关,这一发现为研究东昆仑造山带的构造演化具有重要意义.
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| 关 键 词： | 北昆仑变质基底 榴辉岩 榴闪岩 金水口岩群 早泥盆世 高压变质 东昆仑 |
| 收稿时间： | 2014/2/25 0:00:00 |
| 修稿时间： | 2014/6/16 0:00:00 |
Discovery and its geological significance of Early Paleozoic eclogite in Xiarihamu-Suhaitu area, western part of the East Kunlun |
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| QI ShengSheng,SONG ShuGuang,SHI LianChang,Cai HangJia and Hu JiChun.Discovery and its geological significance of Early Paleozoic eclogite in Xiarihamu-Suhaitu area, western part of the East Kunlun[J].Acta Petrologica Sinica,2014,30(11):3345-3356. |
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| Authors: | QI ShengSheng SONG ShuGuang SHI LianChang Cai HangJia and Hu JiChun |
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| Institution: | China University of Geosciences, Beijing 100083, China;Qinghai Institute of Geological Survey, Xining 810012, China;Qinghai Provincial Key Laboratory of Geological Processes and Mineral Resources of Northern Qinghai-Tibetan Plateau, Xining 810012, China;Department of Geology, Peking University, Beijing 100871, China;Qinghai Institute of Geological Survey, Xining 810012, China;Qinghai Provincial Key Laboratory of Geological Processes and Mineral Resources of Northern Qinghai-Tibetan Plateau, Xining 810012, China;Qinghai Institute of Geological Survey, Xining 810012, China;Qinghai Provincial Key Laboratory of Geological Processes and Mineral Resources of Northern Qinghai-Tibetan Plateau, Xining 810012, China;Qinghai Institute of Geological Survey, Xining 810012, China;Qinghai Provincial Key Laboratory of Geological Processes and Mineral Resources of Northern Qinghai-Tibetan Plateau, Xining 810012, China |
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| Abstract: | |
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| Keywords: | North Kunlun metamorphic basement Eclogite Amphibolitic eclogite Jingshuikou Group Early Devonian High-pressure metamorphism East Kunlun |
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