Re-Os isotopic compositions of picrites from the Emeishan flood basalt province, China

被引:100
|
作者
Zhang, Zhaochong [1 ]
Zhi, Xiachen [2 ]
Chen, Lei [2 ]
Saunders, Andrew D. [3 ]
Reichow, Marc K. [3 ]
机构
[1] China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China
[2] Univ Sci & Technol China, CAS Key Lab Crust Mantle Mat & Environm, Sch Earth & Space Sci, Hefei 230026, Peoples R China
[3] Univ Leicester, Dept Geol, Leicester LE1 7RH, Leics, England
基金
中国国家自然科学基金;
关键词
Re-Os isotope; picrite; plume; Emeishan flood basalt province; upper-lower mantle boundary;
D O I
10.1016/j.epsl.2008.09.005
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Picrites from the Lijiang area, in the western part of the Emeishan flood basalt province, are considered to be one of the most important indicators of the Emeishan mantle plume, and may represent initial mantle plume activity. This paper presents the first Re-Os isotope data for picrites from the province. Eighteen geochemically well characterised samples, including 12 picrites and 6 basalts from two sections near Lijiang, have been analyzed for Os isotopes. The picrites from the two sections have overlapping Re and Os concentrations and initial Os isotopic compositions. They have higher Os concentrations (1.5-3 parts per billion), and slightly lower Re concentrations (<0.07 ppb) than those from many other flood basalt provinces (FBPs) and ocean island picrites. The picrites have distinctly unradiogenic Os isotopes with gamma Os(t) values (t=259 Ma) of -0.9 to -2.4, but the associated basalts have suprachondritic Os isotope compositions with gamma Os(t) of 1.8 to 73.3, which overlap with published data for basalts from other localities in the province. The high gamma Os(t) values of the basalts could be the result of crustal contamination, which is enabled by the low Os concentrations in the parental basalts. The low gamma Os(t) values of the picrites are unusual in terms of plume-related magmatism. There is no clear evidence for recycled crustal material in the mantle source of the Emeishan picrites, or for a significant degree of interaction of the picrites with ancient subcontinental lithospheric mantle of the Yangtze craton. The low gamma Os(t) values relative to many other plume-related picrites (from ocean islands or flood basalt provinces) indicate that there was no clear Os isotope evidence of involvement of the Earth's core or recycled crustal components in the formation of Emeishan flood basalt province. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码:30 / 39
页数:10
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