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Petrogenesis and tectonic significance of the similar to 850 Ma Gangbian alkaline complex in South China: Evidence from in situ zircon U-Pb dating, Hf-O isotopes and whole-rock geochemistry

文献类型：期刊论文

作者Li, Xian-Hua1,2; Li, Wu-Xian2; Li, Qiu-Li1; Wang, Xuan-Ce1; Liu, Yu1; Yang, Yue-Heng1
刊名LITHOS
出版日期2010
卷号114期号:1-2页码:1-15
关键词Syenites U-Pb zircon age In situ zircon Hf-O isotopes Geochemistry Hf-Nd isotopes South China
ISSN号0024-4937
DOI10.1016/j.lithos.2009.07.011
文献子类Article
英文摘要The Gangbian alkaline complex in the southeastern Yangtze Block (South China) is composed of Si-undersaturated pyroxene syenites and Si-saturated to -oversaturated syenites and quartz monzonites. SIMS zircon U-Pb analyses indicate that the complex was emplaced at 848 +/- 4 Ma, during a previously-recognized interval of magmatic quiescence between the ca 1.0-0.89 Ga Sibaoan orogenic magmatism and the ca 0.83-0.78 Ga magmatic flare-up. The Gangbian rocks are characterized by wide, coherent variations in major and trace elements (SiO2 = 47.6-68.4%, K2O + Na2O = 4.5-10.5%, K2O/Na2O = 0.4-1.2, MgO = 1.2-8.5%, Cr = 4.5-239 ppm, and Ni = 4.5-143 ppm) and by enrichment in LIL and LREE and depletion in Nb, Ta and P in trace element spidergrams. Their whole-rock epsilon Nd(T) (-6.5 to -0.4) and epsilon Hf(T) (-10.7 to 0.4) are positively correlated, suggesting involvement of both metasomatized mantle and continental crust materials in their genesis. In situ zircon Hf-O isotopic measurements for the most evolved quartz monzonite sample yield a binary mixing trend between the mantle- and supracrustal-derived melts. It is suggested that the pyroxene syenites were derived by partial melting of metasomatized, phlogopite-bearing lithospheric mantle, and the parental magma experienced extensive fractionation of pyroxene and olivine associated with varying degrees of crustal contamination. Subsequent fractional crystallization of hornblende and minor amounts of plagioclase from the alkali basaltic magmas, accompanied by crustal contamination, produced the Si-saturated to -oversaturated syenites and quartz monzonites. These ca. 0.85 Ga alkaline rocks and neighboring contemporaneous dolerite dykes are the products of the anorogenic magmatism after the Sibao Orogeny. They post-date the final amalgamation between the Yangtze and Cathaysia Blocks, most likely manifesting the initial rifting of South China within the Rodinia supercontinent. (C) 2009 Elsevier B.V. All rights reserved.
WOS关键词BIMODAL VOLCANIC-ROCKS ; YANGTZE BLOCK ; SW CHINA ; SM-ND ; CATHAYSIA BLOCKS ; BREAK-UP ; SOUTHEASTERN CHINA ; DETRITAL ZIRCON ; JIANGNAN OROGEN ; WESTERN MARGIN
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000274378300001
出版者ELSEVIER SCIENCE BV
资助机构NSFC(40721063 ; NSFC(40721063 ; NSFC(40721063 ; NSFC(40721063 ; 40773016 ; 40773016 ; 40773016 ; 40773016 ; 40773007) ; 40773007) ; 40773007) ; 40773007) ; NSFC(40721063 ; NSFC(40721063 ; NSFC(40721063 ; NSFC(40721063 ; 40773016 ; 40773016 ; 40773016 ; 40773016 ; 40773007) ; 40773007) ; 40773007) ; 40773007) ; NSFC(40721063 ; NSFC(40721063 ; NSFC(40721063 ; NSFC(40721063 ; 40773016 ; 40773016 ; 40773016 ; 40773016 ; 40773007) ; 40773007) ; 40773007) ; 40773007) ; NSFC(40721063 ; NSFC(40721063 ; NSFC(40721063 ; NSFC(40721063 ; 40773016 ; 40773016 ; 40773016 ; 40773016 ; 40773007) ; 40773007) ; 40773007) ; 40773007)
源URL[http://ir.iggcas.ac.cn/handle/132A11/72557]  
专题中国科学院地质与地球物理研究所
通讯作者Li, Xian-Hua
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100027, Peoples R China
2.Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Isotope Geochronol & Geochem, Guangzhou 510640, Guangdong, Peoples R China
推荐引用方式
GB/T 7714		 Li, Xian-Hua,Li, Wu-Xian,Li, Qiu-Li,et al. Petrogenesis and tectonic significance of the similar to 850 Ma Gangbian alkaline complex in South China: Evidence from in situ zircon U-Pb dating, Hf-O isotopes and whole-rock geochemistry[J]. LITHOS,2010,114(1-2):1-15.
APA Li, Xian-Hua,Li, Wu-Xian,Li, Qiu-Li,Wang, Xuan-Ce,Liu, Yu,&Yang, Yue-Heng.(2010).Petrogenesis and tectonic significance of the similar to 850 Ma Gangbian alkaline complex in South China: Evidence from in situ zircon U-Pb dating, Hf-O isotopes and whole-rock geochemistry.LITHOS,114(1-2),1-15.
MLA Li, Xian-Hua,et al."Petrogenesis and tectonic significance of the similar to 850 Ma Gangbian alkaline complex in South China: Evidence from in situ zircon U-Pb dating, Hf-O isotopes and whole-rock geochemistry".LITHOS 114.1-2(2010):1-15.

入库方式： OAI收割

来源：地质与地球物理研究所

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