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The willouran basic province of South Australia:Its relation to the Guibei large igneous province in South China and the breakup of Rodinia

The Willouran basic province of South Australia:Its relation...

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中国科学院地质与地球物理研究所第十届(2010年度)学术年会

作者： Xuan-Ce Wang~(a,b,c,*),Xian-Hua Li~a,Zheng-Xiang Li~b,Ying Liu~d,Yue-Heng Yang~a a State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,P.O.Box 9825,Beijing 100029,China b The Institute for Geoscience Research,Department of Applied Geology,Curtin University,GPO Box U1987,Perth,WA 6845,Australia c School of Earth and Environment,the University of Western Australia,Crawley,WA 6009,Australia d Key Laboratory of Isotope Geochronology and Geochemistry,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China

The willouran basic province in South-Central Australia and the Guibei large igneous province(LIP)in the South China Block are two of the most prominent Neoproterozoic LIPs related to the breakup of the supercontinent *** willouran basic province is dominated by tholeiitic mafic dykes(the Gairdner dykes),flood basalts(the Wooltana basalts),and mafic *** basaltic suites across a distance of more than f 000 km have similar immobile major element compositions,uniform tholeiitic OIB-type trace element distribution patterns,and identical Hf-Nd isotopic *** analyses from this study imply that their generation may have involved both depleted and enriched mantle sources,similar to that of the Guibei *** age distributions of the two LIPs are also comparable,peaking at ca.825 *** simultaneous flare-up of mafic magmatism in the two continents,including high-temperature lavas found in the South China Block,coincides with the starting up of widespread continental rifting in *** thus speculate that the two LIPs could have been parts of a once contiguous LIP,which was dismembered during the breakup of *** work thus provides additional support for the proposed South China-Australia connection in Rodinia.

关键词： Neoproterozoic willouran basic province Wooltana basalts Large igneous province Mantle plume Australia South China Rodinia

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