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首页> 外文期刊>Journal of Asian earth sciences >The late Mesozoic-Cenozoic tectonic evolution of the South China Sea: A petrologic perspective
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The late Mesozoic-Cenozoic tectonic evolution of the South China Sea: A petrologic perspective

机译：南海中晚期新生代构造演化的岩石学研究

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This paper presents a review of available petrological, geochonological and geochemical data for late Mesozoic to Recent igneous rocks in the South China Sea (SCS) and adjacent regions and a discussion of their petrogeneses and tectonic implications. The integration of these data with available geophysical and other geologic information led to the following tectono-magmatic model for the evolution of the SCS region. The geochemical characteristics of late Mesozoic granitic rocks in the Pearl River Mouth Basin (PRMB), micro-blocks in the SCS, the offshore continental shelf and Dalat zone in southern Vietnam, and the Schwaner Mountains in West Kalimantan, Borneo indicate that these are mainly I-type granites plus a small amount of S-type granites in the PRMB. These granitoids were formed in a continental arc tectonic setting, consistent with the ideas proposed by Hollo way (1982) and Taylor and Hayes (1980, 1983), that there existed an Andean-type volcanic arc during later Mesozoic era in the SCS region. The geochonological and geochemical characteristics of the volcanics indicate an early period of bimodal vol-canism (60-43 Ma or 32 Ma) at the northern margin of the SCS, followed by a period of relatively passive style volcanism during Cenozoic seafloor spreading (37 or 30-16 Ma) within the SCS, and post-spreading volcanism (tholeiitic series at 17-8 Ma, followed by alkali series from 8 Ma to present) in the entire SCS region. The geodynamic setting of the earlier volcanics was an extensional regime, which resulted from the collision between India and Eurasian plates since the earliest Cenozoic, and that of the post-spreading volcanics may be related to mantle plume magmatism in Hainan Island. In addition, the nascent Hainan plume may have played a significant role in the extension along the northern margin and seafloor spread-ine in the SCS.
机译：本文综述了南海及邻近地区中生代晚期至近期火成岩的可用岩石学，地球化学和地球化学数据，并对它们的岩石成因和构造意义进行了讨论。这些数据与可用的地球物理和其他地质信息的整合导致了以下构造-岩浆模型用于SCS区域的演化。珠江口盆地中后期的中生代花岗岩岩石，南海的微区块，越南南部的近海陆架和大叻地区以及婆罗洲西加里曼丹的施瓦纳山的地球化学特征表明，这些主要是PRMB中的I型花岗岩加上少量的S型花岗岩。这些花岗石是在大陆弧构造环境中形成的，与Hollo Way（1982）和Taylor and Hayes（1980，1983）提出的想法一致，即南海地区中生代以后存在安第斯类型的火山弧。火山的地球化学和地球化学特征表明，在南海北部边缘出现了双峰火山活动的早期阶段（60-43 Ma或32 Ma），随后在新生代海床扩散期间发生了相对被动的火山活动阶段（37或70）。 SCS范围内的30-16 Ma），以及整个SCS区域的后扩散火山作用（高发系列为17-8 Ma，随后为碱系列，从8 Ma到现在）。早期火山的地球动力学环境是一种扩张性机制，这是自最早的新生代以来印度与欧亚板块之间的碰撞所致，而后扩散的火山的地球动力学环境可能与海南岛的地幔柱岩浆作用有关。此外，新生的海南羽状流可能在南海的北缘延伸和海底扩散作用中起了重要作用。

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