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学科主题: Geochemistry & Geophysics; Mineralogy
题名: Origin of early Cretaceous calc-alkaline lamprophyres from the Sulu orogen in eastern China: implications for enrichment processes beneath continental collisional belt
作者: Guo, F ; Fan, WM ; Wang, YJ ; Zhang, M
通讯作者: guofengt@263.net
关键词: geochemistry ; lamprophyres ; early cretaceous ; mantle metasomatism ; continental subduction ; The Sulu orogen
刊名: LITHOS
发表日期: 2004
卷: 78, 期:3, 页:291-305
收录类别: sci
部门归属: Guangzhou Inst Geochem, Key Lab Marginal Sea Geol, Guangzhou 510640, Peoples R China; Chinese Acad Sci, S China Sea Inst Oceanol, Guangzhou 510640, Guangdong, Peoples R China; Macquarie Univ, Dept Earth & Planetary Sci, ARC Natl Key Ctr Geochem Evolut & Met Continents, N Ryde, NSW 2109, Australia
项目归属: 海洋地质
摘要: K-Ar dating, major- and trace-element and Sr-Nd isotopic analyses were carried out for early Cretaceous (122-127 Ma) lamprophyres from the Sulu orogen in eastern China. The results show strong fractionation in rare-earth elements with (LREE) >100 times chondrite, but HREE < 10 times chondrite, indicating the presence of residual garnet in the melting source. These rocks are characterized by significant LILE and LREE enrichment but Nb and Ta depletion with moderate Zr/Hf (39.8-50.8 with regard to 36 for primitive mantle) and Nb/Ta (17.8-23.0, compared with 17.5 for primitive mantle) fractionations, probably as a consequence of carbonate- and rutile-rich melt metasomatism induced by dehydration and/or melting of subducted continental slab at mantle depths. Age-correlated Sr-Nd isotope ratios show moderate ranges of Sr-87/Sr-86(i) from 0.70787 to 0.70934 and - 17.2 to - 11.6 Of epsilon(Nd)(t). The lamprophyres from the Sulu orogen were derived from decompression melting of such a metasomatized lithospheric mantle that was mainly composed of phlogophite garnet peridotites and experienced crystal fractionation of a mineral assemblage of olivine +/- clinopyroxene plagioclase en route to the Surface. Such geochemical and isotopic signatures are also prevalent in the contemporaneous basaltic lavas in the Dabie-Sulu belt, suggesting predominant enrichment processes by carbonate- and rutile-rich metasomatic assemblage beneath the continental collisional belt. (C) 2004 Elsevier B.V. All rights reserved.
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WOS记录号: WOS:000224610300003
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4778
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Guo, F; Fan, WM; Wang, YJ; Zhang, M.Origin of early Cretaceous calc-alkaline lamprophyres from the Sulu orogen in eastern China: implications for enrichment processes beneath continental collisional belt,LITHOS,2004,78(3):291-305
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