| 西藏达金海相碎屑岩的组成、地球化学特征及其构造背景 |
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| 引用本文： | 闫臻,方爱民,潘裕生,李继亮,刘小汉,俞良军.西藏达金海相碎屑岩的组成、地球化学特征及其构造背景[J].岩石学报,2006,22(4):949-960. |
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| 作者姓名： | 闫臻 方爱民 潘裕生 李继亮 刘小汉 俞良军 |
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| 作者单位： | 1. 中国科学院地质与地球物理研究所岩石圈演化开放实验室,100029,北京
2. 中国科学院青藏高原研究所,100029,北京 |
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| 基金项目： | 国家研究发展基金;中国科学院知识创新工程项目;国家自然科学基金 |
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| 摘 要： | 达金海相碎屑岩出露于西藏冈仁波齐峰山脚下,长期以来,该套岩石与冈底斯砾岩一起被视为印度-亚洲板块碰撞形成的陆相磨拉石.该套岩石组合是由凝灰质粉砂岩、杂砂岩、含砾杂砂岩和砾岩组成的一套深海-浅海相沉积组合.杂砂岩、砾岩碎屑组成与地球化学组成研究表明,该套岩石组合的形成与岛弧的发展密切相关,源区大地构造背景以岛弧为主,但也存在被动大陆边缘和碰撞构造带（蛇绿混杂带）两个不同构造背景的源区.区域上,在该套岩石组合的北侧存在着冈底斯岛弧带,南侧为雅鲁藏布蛇绿混杂带.这些特征共同表明,达金海相碎屑岩是西藏雅鲁藏布缝合带与冈底斯岛弧带之间的日喀则弧前盆地的一部分.
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| 关 键 词： | 冈仁波齐峰 达金海相碎屑岩 碎屑组成 源区 构造背景 |
| 文章编号： | 1000-0569/2006/022(04)-0949-60 |
| 收稿时间： | 12 9 2005 12:00AM |
| 修稿时间： | 02 24 2006 12:00AM |
Detrital Modal, geochemical characteristics and tectonic setting of the Dajin marine clastic rocks, Tibet |
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| YAN Zhen,FANG AiMin,PAN YuSheng,LI JiLiang,LIU XiaoHan,YU LiangJun.Detrital Modal, geochemical characteristics and tectonic setting of the Dajin marine clastic rocks, Tibet[J].Acta Petrologica Sinica,2006,22(4):949-960. |
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| Authors: | YAN Zhen FANG AiMin PAN YuSheng LI JiLiang LIU XiaoHan YU LiangJun |
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| Institution: | 1. Lab of Lithosphere Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China ;2. Institute of Tibet Plateau Research, Chinese Academy of Sciences, Beijing 100029, China |
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| Abstract: | The Dajin marine clastic rocks outcropped in the Gangriboche Mountain area, western Tibetan, which was previously regarded as a part of nonmarine molasse together with Gangdese conglomerates formed by India-Eurasia collision. So far, detrital assemblage, source area, and tectonic setting of this unit have not been studied in detail. This paper presents detrital modal from statistic petrological data of conglomerates and greywacke as well as geochemical data of the greywacke and siltstones which are used to study and discuss their source area and tectonic setting based on their sedimentary sequences. These data indicate that source area of the Dajin marine deposits is characterized by combination of continental arc, oceanic island arc and passive continental margin, and that the Dajin marine deposits may deposit in a forearc basin. |
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| Keywords: | Gangriboche Mountain Dajin marine deposits Detrital modal Source area Tectonic settings |
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