Variation of Re-Os isotopic system during peridotite-melt interaction: Implication for the meaning of Re-Os isotopic age of Cenozoic mantle peridotites from the North China Craton.

	Variation of Re-Os isotopic system during peridotite-melt interaction: Implication for the meaning of Re-Os isotopic age of Cenozoic mantle peridotites from the North China Craton.
	Zhang HongFu
刊名	ACTA PETROLOGICA SINICA
	2008-11-01
卷号	24 期号:11 页码:2457-2467
关键词	Re-Os systenatics Melt/rock interaction Re or radiogenic Os introduction Os isotopic age Eastern North China Craton
ISSN号	1000-0569
英文摘要	More and more attention has been paid to peridotite Re-Os isotopic system as this system behaves as all important method to probe the formation age of the lithospheric mantle, However, if the Re-Os system is affected by the low-temperature alteration such as serpentinization of the peridotite and mantle metasomatism or peridotite-melt interaction is still not very clear, This paper, based on the reviewing intergration of the studies oil the typical orogenic peridotite massif profile and mantle peridotite xenoliths in the world, found-that peridotite Re-Os system is generally unaffected by the low-temperature alteration. However, peridotite-melt interaction could change. the. peridotite Re-Os system, i.e. the introduction of the Re and/or Os. Periditite-melt interaction at the low melt/rock ratios (<= 1) could result in an obvious increase in peridotitc Re abundance and a limited increase in radiogenic Os, i.e. (187)Os. The peridotite-melt interaction at the high melt/rock (>= 1) could result in a marked increase in (187)Os isotope. At the same time, positive correlations between the Re abundance of the peridotite and moderately incompatible major and trace elements such as Air Ti, Yb have been interpreted by two stage model of evolution, namely as an result. of early stage partial melting and later peridotite-melt interaction. The positive correlation between the Re abundance and the Cr observed in the peridotite further argue for such a suggestion. Above result has all important implication for the evolution of the lithospheric mantle beneath the eastern North China Craton. Archean lithospheric mantle indeed occurred in the Paleozoic in the eastern North China Craton. However, mantle peridotite xenoliths entrained in the Cenozoic basalts ubiquitously have Proterozoic rather than Archean Re-Os ages. This fact suggests that peridotite-melt interaction indeed exist extensively in the lithospheric mantle beneath the eastern North China Craton, leading to the lithospheric mantle becoming younger. Therefore, Re-Os isotopic ages of the Cenozoic mantle xenoliths are not the formation age of the lithospheric mantle, but the result of the peridotite and melt mixing. fie abundance of the Hannuoba peridotites and Sr-Nd isotopes have shown a mixing trend of the peridotites and multiple melts. The negative correlation between their whole-rock Al(2)O(3) contents and olivine F(o) can also be interpreted by this peridotite-melt interaction.
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000262521300001
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/69908]
专题	中国科学院地质与地球物理研究所
通讯作者	Zhang HongFu
作者单位	Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Zhang HongFu. Variation of Re-Os isotopic system during peridotite-melt interaction: Implication for the meaning of Re-Os isotopic age of Cenozoic mantle peridotites from the North China Craton.[J]. ACTA PETROLOGICA SINICA,2008,24(11):2457-2467.
APA	Zhang HongFu.(2008).Variation of Re-Os isotopic system during peridotite-melt interaction: Implication for the meaning of Re-Os isotopic age of Cenozoic mantle peridotites from the North China Craton..ACTA PETROLOGICA SINICA,24(11),2457-2467.
MLA	Zhang HongFu."Variation of Re-Os isotopic system during peridotite-melt interaction: Implication for the meaning of Re-Os isotopic age of Cenozoic mantle peridotites from the North China Craton.".ACTA PETROLOGICA SINICA 24.11(2008):2457-2467.