Precambrian mafic dyke swarms in the North China Craton and their geological implications
作者单位：State Key Laboratory of Lithospheric EvolutionInstitute of Geology and GeophysicsChinese Academy of Sciences
会议名称：《中国科学院地质与地球物理研究所2015年度（第15届）学术年会》
会议日期：2016年
学科分类：0709[理学-地质学] 070901[理学-矿物学、岩石学、矿床学] 07[理学]
基 金：supported by the National Basic Research Program of China (Grant No.2012CB416601) the National Natural Science Foundation of China (Grant Nos.41322018,41072146)
关 键 词：North China Craton Precambrian mafic dyke swarm rift system supercontinent paleogeographic reconstruction
摘 要：A map of major Precambrian mafic dyke swarms and related units in the North China Craton is compiled,and the features and geological implications of these swarms are *** Archean dyke swarms are available to portray the early crustal growth and *** middle Paleoproterozoic(2200–1850 Ma)swarms and related magmatic series could constrain the tectonic evolution:They approve that the craton was amalgamated by two *** late Paleoproterozoic(1800–1600 Ma),Mesoproterozoic(1400–1200 Ma)and Neoproterozoic(1000–800 Ma)series swarms are important in paleogeographic reconstruction:they indicate that North China might have connected with some of the North European and North American cratons during *** swarms are not only geological timescales and tectonic markers but also evolution indicators of lithospheric mantle:they imply a rejuvenation of the sub-continental lithospheric mantle of North China at 1780–1730 *** swarms occurred with several rifts,including the Hengling(2200–1970 Ma),Xuwujia(1970–1880Ma),Xiong’er(1800–1600 Ma),Yan-Liao(1730–1200 Ma),and Xu-Huai(1000–800 Ma).Among them,the Xuwujia rift was possibly continental arc associated;whereas the others were *** addition,the Xiong’er and Xu-Huai rifts were possibly triple junctions along the present southern and southeastern margins of the Craton,*** tectonic settings of these rifts and dyke swarms would result in diversified series of ore deposits.