关于南海中央次海盆海山火山岩形成背景与构造约束的再认识

杨蜀颖; 方念乔; 杨胜雄; 姚伯初; 梁德华

doi:10.3799/dqkx.2011.048

Volume 36 Issue 3

May 2011

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Article Navigation > Earth Science > 2011 > 36(3): 455-470

YANG Shu-ying, FANG Nian-qiao, YANG Sheng-xiong, YAO Bo-chu, LIANG De-hua, 2011. A Further Discussion on Formation Background and Tectonic Constraints of Igneous Rocks in Central Sub-Basin of the South China Sea. Earth Science, 36(3): 455-470. doi: 10.3799/dqkx.2011.048

Citation:

YANG Shu-ying, FANG Nian-qiao, YANG Sheng-xiong, YAO Bo-chu, LIANG De-hua, 2011. A Further Discussion on Formation Background and Tectonic Constraints of Igneous Rocks in Central Sub-Basin of the South China Sea. Earth Science, 36(3): 455-470. doi: 10.3799/dqkx.2011.048

Citation:

YANG Shu-ying, FANG Nian-qiao, YANG Sheng-xiong, YAO Bo-chu, LIANG De-hua, 2011. A Further Discussion on Formation Background and Tectonic Constraints of Igneous Rocks in Central Sub-Basin of the South China Sea. Earth Science, 36(3): 455-470. doi: 10.3799/dqkx.2011.048

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A Further Discussion on Formation Background and Tectonic Constraints of Igneous Rocks in Central Sub-Basin of the South China Sea

doi: 10.3799/dqkx.2011.048

1.
School of Ocean Sciences, China University of Geosciences, Beijing 100083, China
2.
Guangzhou Marine Geological Survey, Guangzhou 510075, China

Received Date: 2010-12-10
Publish Date: 2011-05-01

Abstract

Abstract

Based on analysis of petrological and geochemical information of igneous rocks sampled from central sub-basin of the South China Sea, this article attempts to address the magmatic processes and tectonic background of the research area. By renewing the available datas and combining them with latest test results of igneous rock samples collected from 6 seamount chains in the central sub-basin of South China Sea (SCS), we analyze the alkali basalt, transitional tholeiite, trachyte, trachyandesite and rhyodacite under a unified magmatic differentiation system in this paper. The geochemical indices show that the evolutionary relationship of these igneous rocks was relatively consistent and the regional mantle source was heterogeneous, consisting of two end-members: EMⅠ and DMM. According to the Mg^#, differentiation index (DI), attributes of major and minor elements, we conclude that subsequent to the fractional crystallization of olivine and pyroxene in upper mantle, the primitive magma continues its evolution to bring about this rock association. Furthermore, geological datas also indicate that during the process of magma evolving, different degrees of contamination occurred in different stages of sea-floor expansion, which may be one of the most important heritage left by the rupture of passive continental margin.
- central sub-basin of South China Sea,
- igneous rocks,
- mantle source,
- crustal contamination,
- rupture of continental margin

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References(65)

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A Further Discussion on Formation Background and Tectonic Constraints of Igneous Rocks in Central Sub-Basin of the South China Sea

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