Two Distinct Mantle Sources for High-Ti Basalts in the
详细信息
- 责任者：Yan Zaifei (Institute of Geochemistry ; State Key Laboratory of Ore Deposits Geochemistry ; Chinese Academy of Sciences ; Guiyang 550002 ; China) ; Huang Zhilong
- 刊名：Journal of Jilin University
- 出版年：2010
- 卷期：40(6)
- 关键词：溢流玄武岩 ; flood basalts ; 峨眉山 ; Mount Emei
- 页码：p.1311-1322
- 图表：5 illus., 1 table, 37 refs.
- 分类号：0801
- issnNo：ISSN1671-5888
- isbnNo：CN22-1343/P
摘要
In order to probe and reveal the characteristics of mantle sources for high-Ti basalts in the Emeishan overfall basalt province, major elements, trace elements and Sr-Nd-Pb isotopes of the Ertan high-Ti basalts are systemic studied. It’s indicated that they can be divided into group A and group B types. Two types of basalts shows such distinct geochemical characteristics as different concentrations of the trace elements (Rb, K, Ba, Th, Nb, Ta) and trace-element ratios (Ba/Nb, Ba/Th, Zr/Nb, Th/La, Zr/Hf) as well as different 87Sr/86Sr and 208Pb*/206Pb* ratios. The difference between group A and group B is resulted from distinct mantle sources instead of magma evolution processes (fractional crystallizztion, crustal contamination, assimilation-fractional crystallization, and partial melting).
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |