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Geochemical variation of volcanic rocks from the South China Sea and neighboring land:Implication for magmatic process and mantle structure

YANG Shuying,  FANG Nianqiao

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文章导航 > Acta Oceanologica Sinica  > 2015 >  34(12): 112-124
杨蜀颖, 方念乔. 南海海盆及其周缘岩浆岩地球化学特征对岩浆过程及地幔结构的指示意义[J]. 海洋学报英文版, 2015, 34(12): 112-124. doi: 10.1007/s13131-015-0759-8
引用本文: 杨蜀颖, 方念乔. 南海海盆及其周缘岩浆岩地球化学特征对岩浆过程及地幔结构的指示意义[J]. 海洋学报英文版, 2015, 34(12): 112-124. doi: 10.1007/s13131-015-0759-8
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YANG Shuying, FANG Nianqiao. Geochemical variation of volcanic rocks from the South China Sea and neighboring land:Implication for magmatic process and mantle structure[J]. Acta Oceanologica Sinica, 2015, 34(12): 112-124. doi: 10.1007/s13131-015-0759-8
Citation: YANG Shuying, FANG Nianqiao. Geochemical variation of volcanic rocks from the South China Sea and neighboring land:Implication for magmatic process and mantle structure[J]. Acta Oceanologica Sinica, 2015, 34(12): 112-124. doi: 10.1007/s13131-015-0759-8
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南海海盆及其周缘岩浆岩地球化学特征对岩浆过程及地幔结构的指示意义

doi: 10.1007/s13131-015-0759-8

  • 中国地质大学(北京)海洋学院, 北京 100083, 中国

基金项目: The National Natural Science Foundation of China under contract Nos 41276047 and 41030853.

Geochemical variation of volcanic rocks from the South China Sea and neighboring land:Implication for magmatic process and mantle structure

  • School of Ocean Sciences, China University of Geosciences, Beijing 100083, China

    摘要
  • 摘要: 本文通过对昆嵩高原,三水盆地以及玳瑁海山岩浆岩的地球化学研究来揭示南海海盆以及周边地区的岩浆过程以及地幔源区的性质。昆嵩,三水及玳瑁海山玄武质岩浆的地球化学特征均反应这些岩浆并非来源于一个起源于核幔边界的深部地幔柱,而是来源于较浅的岩浆源区,例如岩石圈下地幔或者软流圈地幔。此外,南海海盆岩浆岩的地幔源区较昆嵩高原和三水盆地岩浆岩的地幔源区更加亏损并且表现出较低的地幔温度。这些差异可能表明三水盆地内的岩浆活动被南海的开张所抑制,而之后又在昆嵩高原复苏。研究区的地幔表现出不均一性,其中的富集地幔端元表现出EM2的特征。这个EM2富集端员是由于伴随着大陆沉积物的中生代古南海板块俯冲到研究区地幔中所形成的。
    Abstract: Geochemical study of Kon Tum (KT) plateau, Sanshui (SS) basin and Daimao (DM) seamount volcanic rocks provides new insight into magmatic processes and characteristics of the mantle source beneath the South China Sea (SCS) basin and its surroundings. Geological signature of basaltic lavas from KT, SS and DM indicate rather than a deep-rooted plume derived from the core-mantle boundary, a shallower mantle domain, such as subcontinental lithosphere mantle or asthenospheric mantle, is more likely to be the mantle source region beneath the SCS basin and its adjacent areas. The mantle source beneath the SCS basin has been shown to be more depleted relative to the source regions of the SS basin and the KT plateau, indicating that the magmatism in the SS basin has been interrupted due to the SCS spreading and then recovered in the KT plateau area. The mantle heterogeneity has been sampled and an enriched component that is geochemically comparable to EM2 endmember has been identified in the mantle source region of the SCS basin and its surroundings. This EM2 component was formed by the recycling of Mesozoic subducted proto-SCS slab along with terrigenous sediments.
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