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Cenozoic basalts in SE China: Chalcophile element geochemistry, sulfide saturation history, and source heterogeneity
Xiao-Wen Huang;  Ben-Xun Su;  Mei-Fu Zhou;  Jian-Feng Gao;  Liang Qi
2017
Source PublicationLithos
Volume282–283Pages:215-227
Abstract

Cenozoic basalts in SE China may be derived from a mixture of depleted MORB mantle (DMM) and enriched mantle 2 (EM2) sources, but whether these basalts share a common mantle source or magmatic history remains unknown. To investigate these unresolved issues, this study sampled basalts from Niutoushan and Mingxi (Fujian province), Xilong (Zhejiang province), and Penghu (Taiwan) for geochemical analysis. The basalt samples show OIB-like trace element patterns and have low PGE contents, with 0.02–0.7 ppb Ir and Pd, 0.05–1.4 ppb Ru, 0.01–0.2 ppb Rh, and 0.06–1.1 ppb Pt. All samples have high Cu/Pd ratios ranging from ~69,000 to 3,500,000, and low Cu/Zr ratios ranging from 0.1 to 0.8, suggesting sulfur-saturated fractionation. Model calculations indicate that the basalts are depleted in PGE due to the retention of 0.001% to 0.1% sulfide in the mantle and the removal of up to 0.0022% sulfide during magma ascent. The crystallization of olivine and spinel, and partial melting are insufficient to account for the observed PGE variation in these basalts. Thus, the distinct PGE patterns in basalts with different ages may reflect the heterogeneity of the mantle source beneath SE China. The source heterogeneity may be due to compositional heterogeneity, particularly variations in oxygen fugacity and PGE mineral phases, or due to variable fluid/melt metasomatic agents in the sub-continental lithospheric mantle. This heterogeneity is possibly related to the westward subduction of the Paleo-Pacific Plate.

KeywordPlatinum-group Element (Pge) Sulfur-saturation Heterogeneous Mantle Source Cenozoic Basalt Se China
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8355
Collection矿床地球化学国家重点实验室
Affiliation1.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
2.State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
3.Department of Earth Sciences, The University of Hong Kong, Hong Kong, China
4.State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China
Recommended Citation
GB/T 7714
Xiao-Wen Huang;Ben-Xun Su;Mei-Fu Zhou;Jian-Feng Gao;Liang Qi. Cenozoic basalts in SE China: Chalcophile element geochemistry, sulfide saturation history, and source heterogeneity[J]. Lithos,2017,282–283:215-227.
APA Xiao-Wen Huang;Ben-Xun Su;Mei-Fu Zhou;Jian-Feng Gao;Liang Qi.(2017).Cenozoic basalts in SE China: Chalcophile element geochemistry, sulfide saturation history, and source heterogeneity.Lithos,282–283,215-227.
MLA Xiao-Wen Huang;Ben-Xun Su;Mei-Fu Zhou;Jian-Feng Gao;Liang Qi."Cenozoic basalts in SE China: Chalcophile element geochemistry, sulfide saturation history, and source heterogeneity".Lithos 282–283(2017):215-227.
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