Tectonic Evolution of the Amdo Terrane, Central Tibet: Petrochemistry and Zircon U-Pb Geochronology
Tectonic Evolution of the Amdo Terrane, Central Tibet: Petrochemistry and Zircon U-Pb Geochronology
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藏中安多地体的构造演化：岩石化学与锆石U-Pb年代学
DOI：
10.1086/665799
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发表时间：
2012-06
影响因子：
1.8
通讯作者：
Santosh, M.
中科院分区：
文献类型：
--
作者：
Zhang, Ze-Ming;Dong, Xin;Liu, Feng;Lin, Yan-Hao;Yan, Rong;Santosh, M.
青藏高原基底岩石的形成和演化受制约性较差。本文报道了西藏中部安多基底正片麻岩、变镁铁质侵入体和变沉积岩的岩石学、地球化学和锆石U-Pb年代学研究结果。最古老的新元古代（距今820 Ma）正片麻岩显示出与火山弧环境的化学亲和力。这些岩石，与同时代的弧岩浆岩，属于安第斯型设置追溯到塞舌尔，马达加斯加，印度西部，拉萨，华南块，Rodinia超大陆组装。安多早古生代晚期（约500 Ma）双峰式侵入体也显示出与弧有关的火成岩的亲缘关系，可能形成于与冈瓦纳超大陆下的原特提斯洋俯冲有关的活动大陆边缘。与相邻的拉萨和羌塘板块相比，安多地块经历了复杂的新元古代和早古生代构造-热事件，并经历了连贯的侏罗纪（约190 Ma）高压麻粒岩相变质作用和岩浆活动，表明安多地块是特提斯洋中的一个孤立的微大陆，在与羌塘或拉萨板块碰撞之前经历了深俯冲。
The formation and evolution of the basement rocks in the Tibetan Plateau remain poorly constrained. Here we report petrology, geochemistry, and zircon U-Pb geochronology of orthogneisses, metamafic intrusions, and metasedimentary rocks from the Amdo basement in central Tibet. The oldest Neoproterozoic (∼820 Ma) orthogneisses show chemical affinity to a volcanic arc setting. These rocks, together with the coeval arc-magmatic rocks, belong to an Andean-type setting traced from the Seychelles, Madagascar, western India, Lhasa, and South China blocks, following the Rodinia supercontinent assembly. The later early Paleozoic (∼500 Ma) bimodal intrusions in Amdo also show an affinity to arc-related igneous rocks and probably formed in an active continental margin associated with the subduction of the Proto-Tethys Ocean beneath the Gondwana supercontinent. In contrast to the adjacent Lhasa and Qiangtang terranes, the Amdo block experienced complex Neoproterozoic and early Paleozoic tectono-thermal events and coherent Jurassic (∼190 Ma) high-pressure granulite-facies metamorphism and associated magmatism, suggesting that the Amdo block was an isolated microcontinent in the Tethyan Ocean and underwent deep subduction before its collision with the Qiangtang or Lhasa terrane.
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影响因子：
5.3
作者：
R. Tucker;L. Ashwal;T. Torsvik
通讯作者：
R. Tucker;L. Ashwal;T. Torsvik
DOI：
10.1086/341762
发表时间：
2002-09
期刊：
The Journal of Geology
影响因子：
--
作者：
Mei‐Fu Zhou;A. Kennedy;M. Sun;J. Malpas;C. Lesher
通讯作者：
Mei‐Fu Zhou;A. Kennedy;M. Sun;J. Malpas;C. Lesher
影响因子：
--
作者：
Cai Li;Qing-guo Zhai;Yongsheng Dong;Xiao-Xiao Huang-Xiao
通讯作者：
Cai Li;Qing-guo Zhai;Yongsheng Dong;Xiao-Xiao Huang-Xiao
DOI：
10.1098/rsta.1988.0124
发表时间：
1988-12
期刊：
Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences
影响因子：
--
作者：
N. Harris;Xu Ronghua;C. Lewis;Jin Chengwei
通讯作者：
N. Harris;Xu Ronghua;C. Lewis;Jin Chengwei
影响因子：
3.4
作者：
M. J. Kohn;M. Wieland;C. D. Parkinson;B. Upreti
通讯作者：
M. J. Kohn;M. Wieland;C. D. Parkinson;B. Upreti