中国东部部分地区新生代岩石圈地幔的成因: 主量和微量元素制约

Liu, Hai Quan, Yan, Jun, Zhao, Jian Xin and An, Ya Jun (2010) 中国东部部分地区新生代岩石圈地幔的成因: 主量和微量元素制约. Yanshi Xuebao, 26 9: 2850-2868.

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Author Liu, Hai Quan
Yan, Jun
Zhao, Jian Xin
An, Ya Jun
Title 中国东部部分地区新生代岩石圈地幔的成因: 主量和微量元素制约
Translated title Origin of Cenozoic lithospheric mantle in several areas of eastern China: Constraints from major and trace elements
Language of Title chi
Journal name Yanshi Xuebao
Translated journal name Acta Petrologica Sinica
Language of Journal Name chi
ISSN 1000-0569
Publication date 2010-09
Sub-type Article (original research)
Volume 26
Issue 9
Start page 2850
End page 2868
Total pages 19
Place of publication Beijing, China
Publisher Zhongguo Kexueyuan Dizhi yu Diqiu Wuli Yanjiusuo
Language chi
eng
Formatted abstract 为厘定中国东部新生代岩石圈地幔的成因,进而探讨岩石圈减薄的方式,本文选择汉诺坝、女山、盘石山和方山尖晶石二辉橄榄岩作为研究对象,系统分析了其主、微量元素。结果表明,这些地区新生代岩石圈地幔具有"新生"的性质,为上涌的软流圈物质经过小于10%的部分熔融程度后的残留相形成,后又经历了类似新生代玄武岩性质的富硅熔体的交代,交代介质的物质贡献小于3%。新生代岩石圈地幔与古老克拉通岩石圈地幔在主、微量元素上的显著差异以及新生代岩石圈地幔微量元素特征的拟合,支持拆沉为华北克拉通东部减薄的主要方式。

Systematic major and trace elements analysis of spinel-lherzolites from Hannuoba, Nushan, Panshishan and Fangshan is carried out to identify the origin of Cenozoic lithosphere in eastern China and to further discuss the mechanisms of lithospheric thinning. The results indicate these areas share a"juvenile"lithospheric mantle, which is residual of upwelling mantle which ever underwent less than 10% partial melting. A less than 3% contribution of silica-enriched basaltic melts analogous to Cenozoic basalt in eastern China was involved in later metasomatism over Cenozoic lithospheric mantle. Distinctive dissimilarity between Cenozoic lithospheric mantle and Archean Cratonic lithospheric mantle in respect of major and trace elements, combined with remarkable similarity to partial melting and metasomatism modeling of trace elements argue predominately thinning mechanism of detachment for eastern North China Craton lithospheric mantle.
Keyword Peridotitic xenoliths
Asthenosphere
Trace elements
Thinning
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
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Created: Thu, 19 Jan 2012, 16:25:15 EST by Professor Jian Zhao on behalf of Centre for Microscopy and Microanalysis