The South China block-Indochina collision: Where, when, and how?

Michel Faure; Claude Lepvrier; Vuong Van Nguyen; Tich Van Vu; Wei Lin; Zechao Chen

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The South China block-Indochina collision: Where, when, and how?

机译：华南地区与印度支那的碰撞：在哪里，何时何地？

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This study uses new field observations and existing studies to shed new light on the origin and significance of two NW-SE striking orogens in NW and NE Vietnam. We conclude that the architecture of each belt is a stack of NE-directed nappes formed either under deep ductile synmetamorphic conditions, or under shallow depth in the SW and NE parts, respectively. The Song Ma zone and Song Chay ophiolitic melange represent two ophiolitic sutures. However, the Late Permian Song Da and Babu mafic rocks are not ophiolites but intraplate basalts related to the Emeishan plume. A Late Triassic unconformity, the 225-205 Ma postorogenic plutonism, and the 250-230 Ma syntectonic metamorphism support an Early to Middle Triassic age for these tectonic events. Both NW and NE belts are due to SW-directed sub-duction with arc magmatism, ocean closure, and continental collision. Though two contemporary S-dip-ping subduction zones might explain the structural evolution of the two belts, a single convergent system, offset by the Tertiary Red River fault, is preferred as this S-directed subduction better accounts for the Late Permian intraplate magmatism. This scenario is discussed in the general geodynamic framework of SE Asia.

机译：这项研究利用新的野外观察和现有研究为西北和越南东北部两个西北向碰撞造山带的起源和意义提供了新的思路。我们得出的结论是，每条带的构造都是在深延性的共形条件下或在西南部和东北部的浅层深度中分别形成的由NE定向的尿布的堆栈。松马地带和松柴蛇纹石混杂物代表两种蛇纹石缝合线。然而，晚二叠世的松达和巴布镁铁质岩不是蛇绿岩，而是与峨眉山羽流有关的板内玄武岩。三叠纪晚期不整合面，225-205 Ma的造山后岩性和250-230 Ma的构造变质支持了这些构造事件的早至中三叠纪年龄。 NW和NE带都是由于西南向引导的俯冲作用，具有弧岩浆作用，海洋封闭和大陆碰撞。尽管两个当代的S型俯冲俯冲带可能解释了两条带的构造演化，但首选单个会聚系统，但被第三纪红河断层所抵消，因为这种S向俯冲可以更好地解释晚二叠纪板内岩浆作用。在东南亚的一般地球动力学框架中讨论了这种情况。

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来源
《Journal of Asian earth sciences》 |2014年第ptaa期|260-274|共15页
作者
Michel Faure; Claude Lepvrier; Vuong Van Nguyen; Tich Van Vu; Wei Lin; Zechao Chen;
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作者单位

Institut des Sciences de la Terre dVrleans, UMR CNRS 7327, University d'Orleans, 45067 Orleans Cedex 2, France;

Institut des Sciences de la Terre de Paris, UMR CNRS 7193, Case 129, Universite Pierre & Marie Curie. 75252 Paris Cedex 05, France;

Faculty of Geology. Hanoi University of Science, Hanoi. Viet Nam;

Faculty of Geology. Hanoi University of Science, Hanoi. Viet Nam;

State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China;

State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China;

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正文语种 eng
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关键词
Collision orogen; Triassic (Indosinian) orogeny; South China block; Indochina; Asia paleogeodynamics;

机译：碰撞造山带;三叠纪（印支期）造山运动;华南地块;印度支那;亚洲古动力学;

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机译：华南地区与印度支那的碰撞：在哪里，何时何地？
8. Marine Accident Report - Capsizing and Sinking of the U.S. Drillship GLOMAR JAVA SEA in the South China Se, 65 Nautical Miles South-Southwest of Hainan Island, People's Republic of China, October 25, 1983 [R] . 1987

机译：海事事故报告 - 中华人民共和国海南岛西南65海里，中国南方海域美国钻探GLOmaR JaVa sE的封舱和下沉，1983年10月25日

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The South China block-Indochina collision: Where, when, and how?

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