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Late Mesozoic volcanism in the northern Huaiyang tectono-magmatic belt, central China: partial melts from a lithospheric mantle with subducted continental crust relicts beneath the Dabie orogen?
Fan, WM; Guo, F; Wang, YJ; Zhang, M; wmfan@cashq.ac.en
2004
发表期刊CHEMICAL GEOLOGY
ISSN0009-2541
卷号209期号:40545页码:27-48
摘要Geochemistry of two groups of late Mesozoic volcanic rocks from the north Huaiyang belt (NHB) of the northern Dabie orogen provide evidence for their derivation from an enriched lithospheric mantle with subducted continental crustal relicts. The older group (149-137 Ma) consists of trachyandesites and trachydacites, showing light rare earth element (LREE) and large ion lithophile element (LILE) enrichment and strong high field strength element (HFSE, e.g., Nb, Ta, P and Ti) depletion, and highly enriched Sr-Nd isotopic signatures (Sr-87/Sr-86(i)=0.7082-0.7098 and epsilon(Nd)(t)=-24.4 to -19.1). Despite variations in SiO2, MgO and isotopic ratios, they exhibit slight change in TiO2, P2O5, Nb and LREE, suggesting that source differences rather than magmatic processes could be a major controlling factor for their genesis. The younger group (132-116 Ma) is mainly composed of basaltic trachyandesites and trachyandesites, having more significant LREE and LILE enrichment and HFSE depletion but less enriched Sr-Nd isotopic compositions (Sr-87/Sr-16(i)=0.7080-0.7084 and epsilon(Nd)(t) =-19.2 to -16.2) than the older group. The time-integrated elemental and isotopic variations from groups 1 to 2 show that less continental crustal materials were involved in producing the younger group of basaltic magmas because of easy exhaustion of the crustal rocks trapped in the lithospheric mantle during generation of the older intermediate-felsic melts. The petrogeneses of the two volcanic suites in the NHB imply that, though some of the subducted continental slices were rapidly exhumed to the crust shortly after collision, a significant volume of the subducted continental crust might be trapped in the lithospheric mantle. (C) 2004 Elsevier B.V. All rights reserved.
部门归属Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Marginal Sea Geol, Guangzhou 510640, Peoples R China; Chinese Acad Sci, S China Sea Inst Oceanol, Guangzhou 510640, Peoples R China; Macquarie Univ, ARC Natl Key Ctr Geochem Evolut & Met Continents, Dept Earth & Planetary Sci, N Ryde, NSW 2109, Australia
关键词Late Mesozoic Volcanic Rocks Geochemistry Subduction Continental Crust Subcontinental Lithospheric Mantle Dabie Orogen
学科领域Geochemistry & Geophysics
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收录类别sci
资助项目海洋地质
WOS记录号WOS:000223488500002
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文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/4792
专题中科院边缘海地质重点实验室
通讯作者wmfan@cashq.ac.en
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GB/T 7714
Fan, WM,Guo, F,Wang, YJ,et al. Late Mesozoic volcanism in the northern Huaiyang tectono-magmatic belt, central China: partial melts from a lithospheric mantle with subducted continental crust relicts beneath the Dabie orogen?[J]. CHEMICAL GEOLOGY,2004,209(40545):27-48.
APA Fan, WM,Guo, F,Wang, YJ,Zhang, M,&wmfan@cashq.ac.en.(2004).Late Mesozoic volcanism in the northern Huaiyang tectono-magmatic belt, central China: partial melts from a lithospheric mantle with subducted continental crust relicts beneath the Dabie orogen?.CHEMICAL GEOLOGY,209(40545),27-48.
MLA Fan, WM,et al."Late Mesozoic volcanism in the northern Huaiyang tectono-magmatic belt, central China: partial melts from a lithospheric mantle with subducted continental crust relicts beneath the Dabie orogen?".CHEMICAL GEOLOGY 209.40545(2004):27-48.
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