Continental flood basalts of the Huashan Group, northern margin of the;Yangtze block - implications for the breakup of Rodinia

doi:10.1080/00206814.2013.799257

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	Continental flood basalts of the Huashan Group, northern margin of the;Yangtze block - implications for the breakup of Rodinia
	Deng, Qi 5; Wang, Jian ; Wang, Zheng-Jiang ; Wang, Xuan-Ce ; Qiu, Yan-Sheng ; Yang, Qing-Xiong ; Du, Qiu-Ding ; Cui, Xiao-Zhuang ; Zhou, Xiao-Lin
刊名	INTERNATIONAL GEOLOGY REVIEW
	2013
卷号	55 期号:15 页码:1865-1884
关键词	Neoproterozoic Huashan Group continental flood basalt mantle plume supercontinent Rodinia northern margin of the Yangtze block South China
ISSN号	0020-6814
DOI	10.1080/00206814.2013.799257
英文摘要	It is generally accepted that Neoproterozoic extension and dispersal of the supercontinent Rodinia was associated with mantle plume or superplume activities. However, plume-generated contemporaneous continental flood basalts (CFBs) have rarely been identified. In this study, we present geochronological and geochemical evidence for the basalts from the Liufangzui Formation of the Huashan Group in the Dahongshan region of east-central China. A representative sample yields a SHRIMP U-Pb zircon age of 824 +/- 9Ma, interpreted as the crystallization age of the rocks. Geochemically, these basalts belong to the subalkaline tholeiite series and display slight enrichments in light rare earth elements (LREE) and varying degrees of deficiency of high field strength elements (HFSE) such as Nb, Ta, and Ti. This pattern is very similar to that of CFBs from the Bikou Group and Tiechuanshan Formation in the northwestern Yangtze block in China and Siberia in Russia. The basaltic magmas underwent partially-fractional crystallization during ascent, but were not intensely influenced by crustal contamination. The characteristic element ratios and negative Hf isotopic analyses (E-Hf(t)=-6.6-2.6) in zircons indicate that the parental magmas of the basalts might have been derived from an enriched lithospheric mantle rather than from the depleted mantle such as normal mid-ocean ridge basalts (N-MORBs). The geochemical signatures and regional geological characteristics show that these basalts were formed along intraplate continental rifts rather than in island arcs or ocean basins. Considering the coeval basic volcanic rocks in South China, we propose that these Huashan Group basalts represent the remnants of plume-generated CFBs and have close spatiotemporal ties with a coeval basic igneous province in Australia. Our results support the Neoproterozoic location of the South China block adjacent to southeastern Australia in the reconstruction model of the supercontinent Rodinia.
学科主题	火成岩岩石学
WOS关键词	ZIRCON U-PB ; SOUTH CHINA CRATON ; VOLCANIC-ROCKS ; MANTLE PLUME ; CATHAYSIA ; BLOCK ; TECTONIC SIGNIFICANCE ; NEOPROTEROZOIC GRANITOIDS ; GEOLOGICAL ; IMPLICATIONS ; GEOCHEMICAL EVIDENCE ; JIANGNAN OROGEN
WOS研究方向	Geology
语种	英语
出版者	TAYLOR & FRANCIS INC
WOS记录号	WOS:000324088000002
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40238]
专题	中国地质调查局成都地质调查中心
作者单位	1.Chinese Acad Geol Sci, Beijing 100037, Peoples R China. 2.China Geol Survey, Chengdu Ctr, Chengdu 610081, Sichuan, Peoples R China. 3.Curtin Univ, Dept Appl Geol, Perth, WA 6845, Australia. 4.Hubei Geol Survey, Wuhan 430034, Hubei, Peoples R China. 5.中国地质科学院（院部）
推荐引用方式 GB/T 7714	Deng, Qi,Wang, Jian,Wang, Zheng-Jiang,et al. Continental flood basalts of the Huashan Group, northern margin of the;Yangtze block - implications for the breakup of Rodinia[J]. INTERNATIONAL GEOLOGY REVIEW,2013,55(15):1865-1884.
APA	Deng, Qi.,Wang, Jian.,Wang, Zheng-Jiang.,Wang, Xuan-Ce.,Qiu, Yan-Sheng.,...&Zhou, Xiao-Lin.(2013).Continental flood basalts of the Huashan Group, northern margin of the;Yangtze block - implications for the breakup of Rodinia.INTERNATIONAL GEOLOGY REVIEW,55(15),1865-1884.
MLA	Deng, Qi,et al."Continental flood basalts of the Huashan Group, northern margin of the;Yangtze block - implications for the breakup of Rodinia".INTERNATIONAL GEOLOGY REVIEW 55.15(2013):1865-1884.