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中国科学院地质与地球物理研究所2003学术年会

作者： Mingguo Zhai~(1*),Ji’an Shao~2,Jie Hao~1 and Peng Peng~1 1 Key Laboratory of Mineral Resources,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing,100029, China, 2 Department of Geology,Peking University,Beijing,China

Recent studies suggest that the South China Block(SCB) was located at a central position in the Neoproterozoic supercontinent rodinia between ca.1000 Ma and 800 Ma,but fewer studies dealt with the North China Block(NCB) in the reconstruction of *** NCB was suggested,in general,to be in a stable cratonic setting from ca.1650 Ma to ca.160-140 *** recent study suggests that there were two metamorphic-magmatic events at～1300-1000 Ma and～800-650 Ma in the *** these events were weak,they have been regarded as marking the assembly(Grenville- age orogenic event) and breakup(Neoproterozoic mafic dyke swarm and granitoid intrusive) of the supercontinent rodinia.A possible Grenvillian ophiolite or convergent margin complex in the NCB exists only in the North Qinling end-Mesoprotcrozoic orogenic *** major mcta-volcanic-scdimcntary rocks in this complex belong to the Kuanping Group and are associated with gabbros and serpentinized *** and post-collisional granites have been recognized along the North Qinling *** and sedimentary rocks along northern margin of the NCB indicate possible continent rift or continental margin *** main rock associations of ca.～800-650 Ma are mafic dyke swarms withε(t) values of enriched ***,this paper suggests that the mafic dykes were possibly related to the breakup of the rodinian *** tectonostratigraphic constraints and palaeomagnetic reconstruction show that the Proterozoic NCB was different from the SCB,but somewhat similar to *** above features possibly suggest that the NCB,as part of the supercontinent rodinia,was possibly located in a marginal location not directly connected to the SCB,but likely adjacent to the Siberian Craton.

关键词： North China Baiyan Obo belt North Qinling belt supercontinent rodinia Grenvillian in China

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Geochemistry and Geochronology of the High-Mg Gabbro Dykes from Quanji Massif: Implications for the Amalgamation of Tarim Block in NW China and Assembly of the rodinia supercontinent

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Acta Geologica Sinica(English Edition) 2016年第S1期90卷 104-105页

作者： LIAO Fanxi CHEN Nengsong M.Santosh SUN Min WANG Qinyan XU Yixian International Research Centre for Geology and Resources along the Silk Roads China University of Geosciences Faculty of Earth Science China University of Geosciences Journal Center China University of Geosciences Beijing Department of Earth Sciences The University of Hong Kong Institute of Geophysics and Geomatics China University of Geosciences

The Tarim Craton is one of the major continental blocks in *** dykes,ultra-mafic–mafic–carbonatite complex and ultra-mafic–mafic pluton of 0.82–0.75 Ga widely occur in Kuluktage,Aksu and Tieklik area along

关键词： High-Mg gabbro dykes Geochemistry and geochronology Double-sided subduction Northwest China supercontinent rodinia

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