ISOTOPIC CHARACTERISTICS OF INTRAPLATE BASALTS IN WEST PACIFIC

SHI Jinhua; ZHONG Yuan; CHEN Lihui; ZHANG Guoliang

doi:10.16562/j.cnki.0256-1492.2017.01.002

2017 Vol. 37, No. 1

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Article navigation > Marine Geology & Quaternary Geology > 2017 > 37(1): 15-22

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SHI Jinhua, ZHONG Yuan, CHEN Lihui, ZHANG Guoliang. ISOTOPIC CHARACTERISTICS OF INTRAPLATE BASALTS IN WEST PACIFIC[J]. Marine Geology & Quaternary Geology, 2017, 37(1): 15-22. doi: 10.16562/j.cnki.0256-1492.2017.01.002

Citation:

SHI Jinhua, ZHONG Yuan, CHEN Lihui, ZHANG Guoliang. ISOTOPIC CHARACTERISTICS OF INTRAPLATE BASALTS IN WEST PACIFIC[J]. Marine Geology & Quaternary Geology, 2017, 37(1): 15-22. doi: 10.16562/j.cnki.0256-1492.2017.01.002

ISOTOPIC CHARACTERISTICS OF INTRAPLATE BASALTS IN WEST PACIFIC

1.
School of Earth Sciences and Engineering, Nanjing University, State Key Laboratory for Mineral Deposits Research, Nanjing 210023, China
2.
Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China

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Corresponding author: CHEN Lihui, chenlh@nju.edu.cn

Received Date: 11 October 2016

Revised Date: 31 October 2016

Publish Date: 28 February 2017

Abstract

Abstract

Most of the West Pacific intraplate basalts are the products of Mesozoic intraplate volcanisms in the South Pacific. The comparison made for the intraplate basalts in the West and South Pacific may reveal the characteristics and the evolution of the super plume in the South Pacific. Based on the previous data published on basalts in the West and South Pacific, we made a study of Sr-Nd-Pb isotopic geochemistry and compared the results from the two regions. The results show that: 1) The isotopic composition of the West Pacific intraplate basalts shows a great heterogeneity, almost covering all the enriched mantle end members, while most of the West Pacific intraplate basalts are the mixture of HIMU and EM-1; 2) Compared to the South Pacific, the isotopic composition of the West Pacific intraplate basalts is less extreme, which indicates a more thorough mixing between mantle end members; 3) Since ~120 Ma, the HIMU-type of basalts are continuous, while EM1-type and EM2-type basalts are intermittent, which may imply that the spatial distribution of HIMU is different from other enriched end members in the deep mantle.
- intraplate basalts /
- isotope /
- deep mantle /
- West Pacific

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References

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