The geochemistry and geological significances of basalts from Carlsberg Ridge in Indian Ocean

Chun Minghao; Yu Zenghui; Zhai Shikui

doi:10.3969/j.issn.0253-4193.2015.08.005

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Chun Minghao, Yu Zenghui, Zhai Shikui. The geochemistry and geological significances of basalts from Carlsberg Ridge in Indian Ocean[J]. Haiyang Xuebao, 2015, 37(8): 47-62. doi: 10.3969/j.issn.0253-4193.2015.08.005

Citation:

Chun Minghao, Yu Zenghui, Zhai Shikui. The geochemistry and geological significances of basalts from Carlsberg Ridge in Indian Ocean[J]. Haiyang Xuebao, 2015, 37(8): 47-62. doi: 10.3969/j.issn.0253-4193.2015.08.005

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The geochemistry and geological significances of basalts from Carlsberg Ridge in Indian Ocean

doi: 10.3969/j.issn.0253-4193.2015.08.005

1.
The Key Lab of Submarine Geosciences and Prospecting Techniques, Ministry of Education, Ocean University of China, Qingdao 266100, China;CNPC Research Institute of Engineering Techology, Tianjin 300451, China
2.
The Key Lab of Submarine Geosciences and Prospecting Techniques, Ministry of Education, Ocean University of China, Qingdao 266100, China

Received Date: 2015-02-09
Rev Recd Date: 2015-06-19

Abstract

Abstract

Major and ICP-MS trace element compositions have been determined for 14 fresh mid-ocean ridge basalts (MORBs) dredged from Carlsberg Ridge to investigate the nature of mantle source and magmatic process beneath this ridge. These basalts can be classified into the typical normal MORB derived from depleted mantle source and basalts with different geochemistry experienced variable degree of fractional crystallization which is mainly dominated by olivine fractionation, a few of basalts have experienced clinopyroxene fractionation and no significant plagioclase fractionation. The basaltic magma is derived from the depleted spinel lherzolite mantle melting and has no obvious major and trace element geochemical evidence suggested the enriched component mixing into the mantle source. The distinct geochemical characteristics for basalts are mainly controlled by various degree of mantle melting and the subsequently different magmatic evolution processes, and the independent magmatic process in different segments is the main dominating factor for differences of magmatism in this ridge. Major and trace element compositions of MORBs from Carlsberg Ridge are very similar to the average composition of global normal mid-ocean ridge basalt (N-MORB), there are no significant differences for compositions of mantle sources, and the average degree and depth of mantle melting among segments of Carlsberg Ridge, and this homogeneity feature continues southward to the northern section of the CIR.
- Indian Ocean,
- Carlsberg Ridge,
- basalts,
- geochemistry,
- mantle melting,
- crystallization evolution

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References(52)

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