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The Simulation of Mesoproterozoic Tectonic Stress Field Forming Mafic Dyke Swarms in the Central North China Craton

HOU Guiting\ QIAN Xianglin\ LI Jianghai (School of Earth and Space Sciences,Peking University,Beijing,100871)  
The Mesoproterozoic mafic dyke swarms are extensively distributed in the central North China Craton(NCC),which are not deformed and metamorphic,emplacing the pre\|existed fractures,so the dyke swarms become the conspicuous marks to reconstruct the Mesoproterozoic tectonic stress field of the central NCC.The mafic dykes in the northern block are transtensional while the dykes in the central and southern blocks are extensional.The Mesoproterozoic tectonic stress field could be simulated on the analysis of the distribution and mechanical origin of the Mesoproterozoic mafic dyke swarms in the central NCC.The simulation result shows that the mafic dyke swarms were formed in the extensional tectonic setting in the NCC in the Mesoproterozoic time,which are related to the extension of the Mesoproterozoic Yanliao\|Zhongtiao aulacogens cross the central NCC.
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