Re-Os Isotope Geochemistry of Basalts from Hannuoba,
详细信息
- 责任者：Jiang Lin ( Key Laboratory of Crust-Mantle Materials and Environments ; CAS ; School of Earth and Space Sciences ; University of Science and Technology of China ; Hefei 230026 ; China) ; Zhi Xiachen
- 刊名：Acta Petrologica Sinica
- 出版年：2010
- 卷期：26(4)
- 关键词：玄武岩 ; basalts ; 锇同位素 ; osmium isotopes ; 锇同位素 ; osmium isotopes ; 河北 ; Hebei Province
- 页码：p.1265-1276
- 图表：illus., 1 table, 77 refs.
- 分类号：0801
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
The whole rock Re-Os isotopic data of 29 basalt samples collected from Bailongdong and Zhouba sections as well as Zhang-20 drill, Hannuoba, North China are reported in this paper. The results show that the Hannuoba basalts have relatively high Os abundances and relatively low Re abundances and show a positive correlation between them. Re and Os abundances of alkali basalt are relatively higher than that of tholeiitic and transitional basalts. The low concentration of Re in samples likely reflects volatile loss during magmatic outgassing in subaerial lavas. The abundances of Os are related to the indices of partial melting and fractional crystallization processes. The alkali basalts have slightly radiogenic Os isotopic compositions within narrow range, whereas the tholeiitic and the transitional basalts have higher radiogenic Os isotopic compositions and wider range. A negative correlation is observed between Os isotopic compositions and Os abundances in Hannuoba basalts. A few tholeiitic samples with rather high Os abundance have radiogenic Os isotopic compositions which probable indicates that tholeiitic basalts were derived from“marble cake” type mantle, not from depleted and metasomatic enriched SCLM. In a word, this study not only approves the primary conclusions in previous research of Hannuoba basalts, but also uncovers some new phenomena, such as Re volatile loss and mantle-crust interaction.
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