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Origin of two types of rhyolites in the Tarim Large Igneous Province: Consequences of incubation and melting of a mantle plume

文献类型：期刊论文

作者Liu, Hai-Quan1,2; Xu, Yi-Gang1; Tian, Wei3; Zhong, Yu-Ting1,2; Mundil, Roland4; Li, Xian-Hua5; Yang, Yue-Heng5; Luo, Zhen-Yu1; Shang-Guan, Shi-Mai1,2
刊名LITHOS
出版日期2014-09-01
卷号204页码:59-72
关键词Rhyolites Crustal anatexis Assimilation-fractional crystallization Mantle plume Tarim Large Igneous Province
ISSN号0024-4937
DOI10.1016/j.lithos.2014.02.007
文献子类Article
英文摘要The Early Permian Tarim Large Igneous Province (LIP) in northwestern China contains a large area of silicic volcanics (similar to 48,000 km(2)) which are spatially and temporally associated with mafic-ultramafic rocks. In order to understand the behavior of crust above a mantle plume, selected rhyolitic samples are investigated in terms of U-Pb zircon dating, geochemical and isotopic analyses. The Tarim rhyolites have high A/CNK ratios (= molar Al2O3/CaO + Na2O + K2O), Fe#, Ga/Al ratios, concentrations of high field strength elements (HFSEs) such as Zr and Nb, and rare earth elements (REEs), along with high zircon saturation temperatures (872-940 degrees C), typical of aluminous A-type granitoids. Two contrasting rock types have been recognized. The low Nb-Ta type rhyolites are mainly associated with the first phase of the Tarim flood basalt magmatism at similar to 290 Ma. They are characterized by negative Nb-Ta anomalies, low epsilon(Nd)(t) and epsilon(Hf)(t) values, and high Sr-87/Sr-88(t) and delta(18) O-zircon values, consistent with a derivation from continental crustal source. The high Nb-Ta type rhyolites and their plutonic equivalents are associated with the second episode of Tarim magmatism (283-272 Ma). They are characterized by small negative to positive Nb-Ta anomalies, oceanic island basalt (0113)-like trace element ratios, low Sr-87/Sr-88(t) and high epsilon(Nd)(t) and epsilon(Hf)(t) values. These high Nb-Ta rhyolites are best interpreted as hybrid products of crystal fractionation of mafic magmas, coupled with crustal assimilation. The temporal and compositional evolution of the Tarim rhyolites reflects various extents of thermal and mass exchange between mantle-derived basaltic magma and crustal material above a mantle plume. When the plume head rises to the base of the Tarim craton, it first melts enriched components in the lithospheric mantle (similar to 290 Ma), part of which may have ponded near the crust-mantle boundary and induced crustal anatexis leading to the formation of the low Nb-Ta type rhyolites. At similar to 280 Ma, large magma chambers and plumbing systems were formed due to increasing magma supply rate during decompression melting of the mantle plume. This led to the formation of a mafic-ultramafic and felsic association of which the high Nb-Ta type rhyolites are a part. (C) 2014 Elsevier B.V. All right reserved
WOS关键词A-TYPE GRANITES ; ZIRCON U-PB ; ENERGY-CONSTRAINED ASSIMILATION ; NW CHINA ; TECTONIC IMPLICATIONS ; NORTHWEST CHINA ; FRACTIONAL CRYSTALLIZATION ; MAGMATIC PROCESSES ; VOLCANIC-ROCKS ; SILICIC MAGMAS
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000342260400007
出版者ELSEVIER SCIENCE BV
资助机构National Basic Research Program of China(2011CB808906) ; National Basic Research Program of China(2011CB808906) ; GIGCAS 135 project(Y234051001) ; GIGCAS 135 project(Y234051001) ; National Natural Science Foundation of China(41203009) ; National Natural Science Foundation of China(41203009) ; National Basic Research Program of China(2011CB808906) ; National Basic Research Program of China(2011CB808906) ; GIGCAS 135 project(Y234051001) ; GIGCAS 135 project(Y234051001) ; National Natural Science Foundation of China(41203009) ; National Natural Science Foundation of China(41203009) ; National Basic Research Program of China(2011CB808906) ; National Basic Research Program of China(2011CB808906) ; GIGCAS 135 project(Y234051001) ; GIGCAS 135 project(Y234051001) ; National Natural Science Foundation of China(41203009) ; National Natural Science Foundation of China(41203009) ; National Basic Research Program of China(2011CB808906) ; National Basic Research Program of China(2011CB808906) ; GIGCAS 135 project(Y234051001) ; GIGCAS 135 project(Y234051001) ; National Natural Science Foundation of China(41203009) ; National Natural Science Foundation of China(41203009)
源URL[http://ir.iggcas.ac.cn/handle/132A11/84952]  
专题中国科学院地质与地球物理研究所
通讯作者Xu, Yi-Gang
作者单位1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Peking Univ, Sch Earth & Space Sci, MOE, Key Lab Orogen Belts & Crustal Evolut, Beijing 100871, Peoples R China
4.Berkeley Geochronol Ctr, Berkeley, CA 94709 USA
5.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		 Liu, Hai-Quan,Xu, Yi-Gang,Tian, Wei,et al. Origin of two types of rhyolites in the Tarim Large Igneous Province: Consequences of incubation and melting of a mantle plume[J]. LITHOS,2014,204:59-72.
APA Liu, Hai-Quan.,Xu, Yi-Gang.,Tian, Wei.,Zhong, Yu-Ting.,Mundil, Roland.,...&Shang-Guan, Shi-Mai.(2014).Origin of two types of rhyolites in the Tarim Large Igneous Province: Consequences of incubation and melting of a mantle plume.LITHOS,204,59-72.
MLA Liu, Hai-Quan,et al."Origin of two types of rhyolites in the Tarim Large Igneous Province: Consequences of incubation and melting of a mantle plume".LITHOS 204(2014):59-72.

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来源：地质与地球物理研究所

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