| 引用本文: | 孙志明, 郑来林, 耿全如, 李生, 廖光宇, 石文礼, 张东.东喜马拉雅构造结高压麻粒岩特征、形成机制及折返过程[J].沉积与特提斯地质,2004,(3):22-29.[点击复制] |
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| 东喜马拉雅构造结高压麻粒岩特征、形成机制及折返过程 |
| 孙志明,郑来林,耿全如,李生,廖光宇,石文礼,张东 |
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(1. 成都地质矿产研究所, 四川 成都 610082;
2. 甘肃地调院 第三地质矿产调查院, 甘肃 兰州 730050) |
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| 摘要: |
| 东喜马拉雅构造结一带断续分布的直白高压麻粒岩,是一套相当于下地壳根带深度形成的高压麻粒岩相岩石。该麻粒岩相地体归属印度大陆东北端,是世界上最年轻的麻粒岩相岩石之一,其变质作用与印度大陆与欧亚大陆之间碰撞过程中发生的陆内俯冲作用有关。对于高压麻粒岩的形成机制及折返过程一直是人们研究和观注的焦点。本文在1:25万墨脱幅区域地质调查项目的研究结果的基础上,依据高压麻粒岩相岩石出露的大地构造背景,讨论了与之有关的若干问题,并提出适合该区的高压麻粒岩的形成机制和折返过程的新认识。 |
| 关键词: 东喜马拉雅构造结 高压麻粒岩 形成机制 折返过程 西藏 |
| DOI： |
| 附件 |
| 投稿时间：2004-07-15 |
| 基金项目:中国地质调查局“1∶25万《墨脱县幅》区域地质调查”。 |
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| Genetic mechanisms and exhumation processes of the high-pressure (granulites) within the Eastern Himalayan syntaxis, Xizang |
| SUN Zhi-ming, ZHENG Lai-lin, GENG Quan-ru, LI Sheng, LIAO Guang-yu, SHI Wen-li, ZHANG Dong |
(1. Chengdu Institute of Geology and Mineral Resources, Chengdu 610082, Sichuan, China;
2. Gansu Institute of Geological S urvey, Lanzhou 730050, Gansu, China) |
| Abstract: |
| The Zhibai Formation Complex high-pressure granulites within the Eastern Himalayan syntaxis are a succession of high-pressure granulites as the youngest granulites in the world formed at the lower crustal root zones. Tectonically these granulites are assigned to the northeastern part of the Indian continent in a tectonically thickening setting and their metamorphism may be related to the intracontinental subduction during the collision between the Indian and Eurasian continents. The exhumation mechanisms of the granulites may be owed to the rapid uplifting of the Higher Himalayan crystalline rock series caused by large-scale detachment and normal faulting due to the combination of the upper flotational and lower gravitational processes. |
| Key words: Eastern Himalayan syntaxis high-pressure granulite genetic mechanism exhumation process Xizang |