| 西藏冈底斯地块中新生代中酸性侵入岩浆活动与构造演化 |
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| 引用本文： | 葛良胜,邓军,杨立强,邹依林,邢俊兵,袁士松,武玉海.西藏冈底斯地块中新生代中酸性侵入岩浆活动与构造演化[J].地质与资源,2006,15(1):1-10. |
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| 作者姓名： | 葛良胜 邓军 杨立强 邹依林 邢俊兵 袁士松 武玉海 |
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| 作者单位： | 1. 中国地质大学“岩石圈构造、深部过程及探测技术”教育部重点实验室, 北京 100083;2. 武警黄金地质研究所, 河北廊坊 065000 |
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| 基金项目： | 国土资源部国土资源大调查项目 |
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| 摘 要： | 冈底斯地块上的中新生代中酸性岩浆活动,是北部班公湖-怒江和南部雅鲁藏布两个特提斯演化及其后的陆内汇聚碰撞造山和后造山伸展等大地构造事件的完整记录.地块上的中酸性岩浆活动可划分为3个带,其中北部岩带岩浆岩形成于燕山期,其类型从早期的Ⅰ型到中期的过渡型演化为晚期的S型,分别形成于板块俯冲-缝合-碰撞等构造条件下,是北部班公湖-怒江特提斯演化的集中反映.中部和南部岩浆岩带则集中体现了雅鲁藏布特提斯时空演化的完整经历.其中,南部岩带岩体以燕山晚期为主,喜马拉雅早期次之,成因及形成环境与特提斯洋壳向北俯冲作用密切相关(燕山晚期),同时俯冲结束后的同碰撞条件下的岩浆活动在该岩带内也有明显的反映(喜马拉雅早期);中部岩带岩体以喜马拉雅早期为主,燕山晚期次之.岩体大部分为同碰撞环境下岩浆活动的产物,它表征了随着洋壳板块向北俯冲程度的加深和强度的加剧,岩浆活动中心在不断向北迁移,并最终缝合碰撞的过程.因此该岩带内岩浆岩主要形成于俯冲的晚阶段及缝合后的同碰撞条件下.喜马拉雅晚期的小斑岩体实际上广泛出露于整个冈底斯地块上,它反映的是该区在经历了碰撞造山后发生的陆内伸展的构造过程.
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| 关 键 词： | 冈底斯地块 中新生代 中酸性侵入岩 岩浆作用 构造演化 西藏 |
| 文章编号： | 1671-1947（2006）01-0001-10 |
| 收稿时间： | 2004-12-29 |
| 修稿时间： | 2005-04-04 |
THE MESO-CENOZOIC ACIDIC-INTERMEDIATE MAGMATISM AND TECTONIC EVOLUTION OF GANDISE MASSIF, TIBET |
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| GE Liang-sheng,DENG Jun,YANG Li-qiang,ZOU Yi-lin,XING Jun-bing,YUAN Shi-song,WU Yu-hai.THE MESO-CENOZOIC ACIDIC-INTERMEDIATE MAGMATISM AND TECTONIC EVOLUTION OF GANDISE MASSIF, TIBET[J].Geology and Resources,2006,15(1):1-10. |
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| Authors: | GE Liang-sheng DENG Jun YANG Li-qiang ZOU Yi-lin XING Jun-bing YUAN Shi-song WU Yu-hai |
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| Institution: | 1. Key Laboratory of Lithospheric Tectonics and Lithoprobing Technology, China University of Geosciences, Beijing 100083, China;2. Institute of Gold Geology, Langfang 065000, China |
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| Abstract: | The Meso-Cenozoic acidic-intermediate magmatism in the Gandise m assif would be divided into three belts. The magmatic rocks in the north belt we re formed in Yanshanian epoch as I-type in early, transitional type in middle and S-type in late stages, respectively under the tectonic background of plat e subduction, suture and collision, reflecting the evolution of Bangongh u-Nujiang Tethys in the north. The middle and south magmatic rock belts expres s the whole evolving course of the Yarlung Zangbo Tethys in the south. The rock bodies in the south belt were formed mainly in Yanshanian, followed by Himalayan epoch. Their origin was closely related to the northward subduction of Tethys o ceanic crust in late Yanshanian epoch. The Himalayan magmatism of syn-collisio n after subduction is evidently recorded in this rock belt.The middle belt conta ins mainly early Himalayan rock bodies, with minor Yanshanian ones, of which mos t were the products of syn-collision magmatism. So the magmatites in this rock belt were formed under the condition of syn-collision during the late stage o f subduction and after the suturing. Patches of porphyries of late Himalayan epo ch broadly occur in the whole Gandise massif, showing the intracontinental exten sion after the collision and orogeny in the region. |
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| Keywords: | Gandise massif Meso-Cenozoic acidic-intermediate intrusive rock magmatism tectonic evolution Tibet |
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