西南印度洋脊原位辉长岩元素地球化学特征及意义

靳野; 方念乔; 杨蜀颖

doi:10.3799/dqkx.2012.006

Volume 37 Issue 1

Jan. 2012

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JIN Ye, FANG Nian-qiao, YANG Shu-ying, 2012. In Situ Gabbro Geochemical Characteristics and Implications from the Southwest Indian Ocean Ridge. Earth Science, 37(1): 57-68. doi: 10.3799/dqkx.2012.006

Citation:

JIN Ye, FANG Nian-qiao, YANG Shu-ying, 2012. In Situ Gabbro Geochemical Characteristics and Implications from the Southwest Indian Ocean Ridge. Earth Science, 37(1): 57-68. doi: 10.3799/dqkx.2012.006

JIN Ye, FANG Nian-qiao, YANG Shu-ying, 2012. In Situ Gabbro Geochemical Characteristics and Implications from the Southwest Indian Ocean Ridge. Earth Science, 37(1): 57-68. doi: 10.3799/dqkx.2012.006

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In Situ Gabbro Geochemical Characteristics and Implications from the Southwest Indian Ocean Ridge

doi: 10.3799/dqkx.2012.006

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

Received Date: 2010-11-03
Publish Date: 2012-01-15

Abstract

Abstract

In this paper, geochemical data of the major and trace elements are analyzed for the samples with different depths and lithology of the upper part of ocean drilling program (ODP) ODP 735B hole, Southwest Indian Ocean ridge. Based on these data, together with some other achievements, geochemical comparisions between and within these two cycles are discussed, and their petrogenesis are constrained. The major element characteristics indicate that their variation was well dominated by the mineral assemblage modal which are controlled by fractional crystallization of the rocks. The correlation of the bulk composition of major elements can, to some extent, indicate the formation of minerals and evolution of geochemical characteristics during the crystallization of basaltic melts. Besides the positive Eu anomaly, LREEs are clearly fractionated, while no fractionation of HREEs occurs. The spidergram shows depletion in Nb and Ta, and enrichment in Sr and K; however, this feature cannot be considered as the basis to decide the geochemical characteristics of the source so as to look into the geological significance.
- gabbro,
- geochemistry,
- drilling,
- Southwest Indian Ocean ridge,
- marine geology

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References(44)

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In Situ Gabbro Geochemical Characteristics and Implications from the Southwest Indian Ocean Ridge

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