| 西藏工布江达县龙崖松多榴辉岩的发现及意义 |
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| 引用本文： | 董宇超,解超明,于云鹏,王斌,李麟瀚,曾孝文.西藏工布江达县龙崖松多榴辉岩的发现及意义[J].地质通报,2018,37(8):1464-1471. |
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| 作者姓名： | 董宇超 解超明 于云鹏 王斌 李麟瀚 曾孝文 |
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| 作者单位： | 吉林大学地球科学学院 |
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| 基金项目： | 中国地质调查局项目《冈底斯-喜马拉雅铜矿资源基地调查》（编号：DD20160015）、《班公湖-怒江成矿带铜多金属矿资源基地调查》（编号：DD20160026）与青年科学基金项目《藏北聂荣微陆块新元古代-寒武纪构造演化》（批准号：41402190）、《青藏高原羌塘南部埃迪卡拉纪地层研究》（批准号：41602230） |
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| 摘 要： | 唐加-松多榴辉岩高压变质带位于冈底斯板块中部,对研究古特提斯构造演化具有至关重要的意义,但是榴辉岩的出露范围和规模尚不清楚。在龙崖松多地区新发现榴辉岩的出露点,通过详细的野外地质调查、岩石学及矿物学研究,发现其岩性为金红石榴辉岩和石英榴辉岩,以透镜体的形式产出,围岩以低绿片岩相岩石为主,少部分为石英白云母片岩。龙崖松多榴辉岩的主要矿物组合为石榴子石、绿辉石、多硅白云母、角闪石、金红石、石英及少量榍石、钛铁矿等,石榴子石的电子探针分析结果显示,从核部到边部,镁铝榴石和铁铝榴石含量逐渐增加,锰铝榴石含量显著减少,具有典型的进变质环带特征,同时榴辉岩边部石榴子石角闪岩的发现,说明该露头的榴辉岩可能经历了后期退变质作用改造。该榴辉岩的发现对探讨唐加-松多蛇绿混杂带的构造演化具有重要意义。
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| 关 键 词： | 青藏高原 龙崖松多 冈底斯板块 榴辉岩 岩相学 |
| 收稿时间： | 2018/1/5 0:00:00 |
| 修稿时间： | 2018/5/15 0:00:00 |
The discovery of Longyasongduo eclogite from Gongbujiangda County, Tibet, and its significance |
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| DONG Yuchao,XIE Chaoming,YU Yunpeng,WANG Bin,LI Linhan and ZENG Xiaowen.The discovery of Longyasongduo eclogite from Gongbujiangda County, Tibet, and its significance[J].Geologcal Bulletin OF China,2018,37(8):1464-1471. |
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| Authors: | DONG Yuchao XIE Chaoming YU Yunpeng WANG Bin LI Linhan and ZENG Xiaowen |
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| Institution: | College of Earth Science, Jilin University, Changchun 130061, Jilin, China,College of Earth Science, Jilin University, Changchun 130061, Jilin, China,College of Earth Science, Jilin University, Changchun 130061, Jilin, China,College of Earth Science, Jilin University, Changchun 130061, Jilin, China,College of Earth Science, Jilin University, Changchun 130061, Jilin, China and College of Earth Science, Jilin University, Changchun 130061, Jilin, China |
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| Abstract: | Located in the central part of Gangdise plate, the Tangjia-Sumdo eclogite-bearing metamorphic belt played an important role in the evolution of the Paleo Tethys Ocean. However, the exposed scale of eclogites is still unclear. In this study, the authors found a new site of eclogite in Longyasongdo area. The detailed field survey and petrographic and mineralogical study show that the lithology of Longyasongduo eclogite includes rutile eclogite and quartz eclogite. The eclogite is in the form of lens. The surrounding rock of Longyasongduo eclogite is mainly greenschist, with a small part being muscovite quartz schist. The general mineral assemblage of eclogite is garnet+omphagite+phengite+amphibole+rutile+quartz, with minor sphene and ilmenite. The analysis of the EMPA composition profile of the garnet shows typical growth zoning, with Xpyr and Xalm increasing from core to rim but Xspe showing a tendency of decrease. Meanwhile, according to the discovery of garnet amphibolite from the edge of eclogite, it is inferred that Longyasongduo eclogite might have undergone retrograde process. The discovery of Longyasongduo eclogite is of great importance for the study of the tectonic evolution of the Tangjia-Sumdo ophiolite belt. |
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| Keywords: | Tibetan Plateau Longyasongduo Gangdise plate eclogite petrography |
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