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Petrogenesis of ca. 830 Ma Lushan bimodal volcanic rocks at the southeastern margin of the Yangtze Block, South China: Implications for asthenospheric upwelling and reworking of juvenile crust

文献类型：期刊论文

作者Cheng, Jin-Xiong1,2; Li, Wu-Xian1; Wang, Xuan-Ce3,4; Li, Xian-Hua2,5; Pang, Chong-Jin6
刊名PRECAMBRIAN RESEARCH
出版日期2020-06-15
卷号342页码:20
关键词Bimodal magmatism Upwelling of asthenospheric mantle Reworking of juvenile crust Neoproterozoic South China
ISSN号0301-9268
DOI10.1016/j.precamres.2020.105673
英文摘要Neoproterozoic bimodal volcanic rocks are widespread in the South China Block and provide information on crust-mantle interaction, the thermal and chemical status of the deep mantle, and the growth and reworking of continental crust. In this paper, we present sensitive high-resolution ion microprobe (SHRIMP) zircon U-Pb ages and whole-rock geochemistry for the Lushan bimodal volcanic rocks in northern Jiangxi Province, South China Block. Our SHRIMP dating indicates that the Lushan bimodal volcanic rocks were erupted at 835-820 Ma. The least-evolved mafic rocks have high epsilon Nd(t) (+8.3) and "arc-like" Nb/La and Nb/Th ratios, thier derivation from fluid-modified depleted mantle. The melts that formed these mafic rocks underwent fractional crystallization involving mineral assemblages of olivine + plagioclase -> clinopyroxene + plagioclase at MgO < similar to 6.0 wt % -> clinopyroxene + plagioclase + Fe-Ti oxides at MgO < similar to 5 wt%, and crustal contamination during ascent. eNd(t) values of the felsic rocks (-1.39 to +1.64) differ from those of the contemporaneous mafic rocks (eNd (t) = +2.19 to +8.33), arguing against an origin by fractional crystallization of the mafic magmas. The felsic rocks are characterized by high (10,000xGa)/Al ratios and enrichment in high-field-strength elements (Nb + Ce + Y+ Zr), low P2O5 contents (< 0.1%), a peraluminous nature (A/CNK > 1.2), and a lack of typical alkaline mafic minerals, suggesting that they are aluminous A-type granitic rocks. Therefore, the felsic rocks probably originated from partial melting of fertile felsic meta-igneous rocks in the shallow crust. The similar to 830 Ma bimodal volcanic rocks indicate Neoproterozoic rift-related extensional thinning of the crust associated with asthenospheric upwelling along the southeastern margin of the South China Block. The geochemistry of the mafic rocks indicates two distinct mantle sources beneath the southeastern margin of the Yangtze Block at ca. 830 Ma: a depleted asthenospheric mantle with epsilon Nd(t) > +8, and an enriched mantle plume source with epsilon Nd (t) < 0. The rift-related asthenospheric mantle upwelling associated with mantle-plume-related mafic magmatism enhanced the geothermal gradient of the crust and conducted mantle heat into it, ultimately resulting in reworking of 860-830 Ma juvenile crust at various levels.
WOS关键词A-TYPE GRANITES ; NEOPROTEROZOIC TECTONIC EVOLUTION ; LARGE IGNEOUS PROVINCE ; U-PB ; JIANGNAN OROGEN ; WESTERN MARGIN ; GEOCHEMICAL EVIDENCE ; ARC-MAGMATISM ; HF ISOTOPES ; SW CHINA
资助项目National Key Research and Development Program of China[2016YFC0600204] ; Chinese Academy of Sciences[QYZDY-SSW-DQC017] ; National Natural Science Foundation of China[41573026] ; National Natural Science Foundation of China[41373033] ; Research Start-up Project for Introduced Talent of Yunnan University[20190043] ; Research Start-up Project for Introduced Talent of Yunnan University[IS-2823]
WOS研究方向Geology
语种英语
WOS记录号WOS:000528208200005
出版者ELSEVIER
资助机构National Key Research and Development Program of China ; National Key Research and Development Program of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Research Start-up Project for Introduced Talent of Yunnan University ; Research Start-up Project for Introduced Talent of Yunnan University ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Research Start-up Project for Introduced Talent of Yunnan University ; Research Start-up Project for Introduced Talent of Yunnan University ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Research Start-up Project for Introduced Talent of Yunnan University ; Research Start-up Project for Introduced Talent of Yunnan University ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Research Start-up Project for Introduced Talent of Yunnan University ; Research Start-up Project for Introduced Talent of Yunnan University
源URL[http://ir.iggcas.ac.cn/handle/132A11/96230]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Li, Wu-Xian
作者单位1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China
2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
3.Yunnan Univ, Res Ctr Earth Syst Sci, Kunming 650500, Yunnan, Peoples R China
4.Changan Univ, Sch Earth Sci & Resources, Xian 710054, Peoples R China
5.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
6.Guilin Univ Technol, Guangxi Key Lab Hidden Metall Ore Deposits Explor, Guilin 541004, Peoples R China
推荐引用方式
GB/T 7714		 Cheng, Jin-Xiong,Li, Wu-Xian,Wang, Xuan-Ce,et al. Petrogenesis of ca. 830 Ma Lushan bimodal volcanic rocks at the southeastern margin of the Yangtze Block, South China: Implications for asthenospheric upwelling and reworking of juvenile crust[J]. PRECAMBRIAN RESEARCH,2020,342:20.
APA Cheng, Jin-Xiong,Li, Wu-Xian,Wang, Xuan-Ce,Li, Xian-Hua,&Pang, Chong-Jin.(2020).Petrogenesis of ca. 830 Ma Lushan bimodal volcanic rocks at the southeastern margin of the Yangtze Block, South China: Implications for asthenospheric upwelling and reworking of juvenile crust.PRECAMBRIAN RESEARCH,342,20.
MLA Cheng, Jin-Xiong,et al."Petrogenesis of ca. 830 Ma Lushan bimodal volcanic rocks at the southeastern margin of the Yangtze Block, South China: Implications for asthenospheric upwelling and reworking of juvenile crust".PRECAMBRIAN RESEARCH 342(2020):20.

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