印度洋亚丁-欧文-卡尔斯伯格脊三联点邻近洋脊的玄武岩地球化学特征及其地幔源区性质

黄凯晖, 韩喜球, 王叶剑, 邱中炎, 李洪林

海洋学研究 ›› 2017, Vol. 35 ›› Issue (4) : 44-60.

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海洋学研究 ›› 2017, Vol. 35 ›› Issue (4) : 44-60. DOI: 10.3969/j.issn.1001-909X.2017.04.005
研究论文

印度洋亚丁-欧文-卡尔斯伯格脊三联点邻近洋脊的玄武岩地球化学特征及其地幔源区性质

  • 黄凯晖1,2, 韩喜球*1,2, 王叶剑1,2, 邱中炎1,2, 李洪林1,2
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Geochemical characteristics of basalt samples from the ridges adjacent to Aden-Owen-Carlsberg Triple Junction and their mantle sources

  • HUANG Kai-hui1,2, HAN Xi-qiu*1,2, WANG Ye-jian1,2, QIU Zhong-yan1,2, LI Hong-lin1,2
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摘要

本文研究了亚丁-欧文-卡尔斯伯格脊(AOC)三联点邻近洋脊的玄武岩样品在主量、微量元素和Pb-Sr-Nd同位素特征上的差异和联系并分析其原因。结果表明,AOC附近卡尔斯伯格脊和希巴洋脊的玄武岩均为正常型洋脊玄武岩(N-MORB),起源自亏损地幔,其中卡尔斯伯格脊的样品较希巴洋脊样品更亏损;欧文洋脊玄武岩样品为洋岛玄武岩(OIB)特征,其地幔源区可能有残余陆块物质的混染;亚丁洋脊玄武岩样品类型包括N-MORB、E-MORB和可能的大陆玄武岩,与洋壳形成过程中大陆岩石圈物质的贡献程度有关。除了卡尔斯伯格脊外,阿法热点对各洋脊的岩浆均有一定程度的影响。

Abstract

The major and trace elements as well as Sr-Nd-Pb isotope compositions of basalt samples were studied, which were obtained from the ridges adjacent to Aden-Owen-Carlsberg(AOC) Triple Junction. The results show that samples from Carlsberg Ridge are typical N-MORB derived from DMM-type mantle source; samples from Sheba also belong to N-MORB, but the mantle source contains some EMII component and hence is more enriched than that of Carlsberg Ridge; samples from Owen Ridge are OIB, probably reflecting the contamination of continental crust; the types of samples from Aden Ridge vary from N-MORB, E-MORB and perhaps continental basalt which derived from the different extent mixture of end-members from DMM, EMII and HIMU. Except for Carlsberg Ridge, all of the other ridges adjacent to AOC have been influenced by Afar Hot Spot.

关键词

亚丁-欧文-卡尔斯伯格脊三联点 / 玄武岩 / 地球化学特征 / 地幔端元

Key words

Aden-Owen-Carlsberg Triple Junction / basalt / geochemical characteristics / mantle source

引用本文

导出引用
黄凯晖, 韩喜球, 王叶剑, 邱中炎, 李洪林. 印度洋亚丁-欧文-卡尔斯伯格脊三联点邻近洋脊的玄武岩地球化学特征及其地幔源区性质[J]. 海洋学研究. 2017, 35(4): 44-60 https://doi.org/10.3969/j.issn.1001-909X.2017.04.005
HUANG Kai-hui, HAN Xi-qiu, WANG Ye-jian, QIU Zhong-yan, LI Hong-lin. Geochemical characteristics of basalt samples from the ridges adjacent to Aden-Owen-Carlsberg Triple Junction and their mantle sources[J]. Journal of Marine Sciences. 2017, 35(4): 44-60 https://doi.org/10.3969/j.issn.1001-909X.2017.04.005
中图分类号: P736.4   

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基金

国际海域资源调查与开发“十二五”研究课题资助(DY125-12-R-03);国家自然科学基金项目资助(91228101)

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