Division Of Metallogenetic Units And Deep Tectonic Structure In Erenhot-Dong Ujimqin Banner Area Of Middle Inner Mongolia, China

According to research about telluric electromagnetic sounding,bouguer gravity anomaly and magnetic anomaly of two deep geological-geophysical profiles across Erenhot City and Dong Ujimqin Banner,and analyses of superficial geological features,further understand about division of structural units and metallogenetic units in China-Mongolia border region were promoted in this study,and we presented evaluations about regional metallogenetic prospect.A geological-geophysical profile named Xinghe-Erenhot passed through a series of tectonic units which were Seerteng Early Proterozoic tectonic zone,Baiyunebo Early Proterozoic tectonic zone,Mandula-Wenduermiao tectonic zone,Suolun-Xilamulun tectonic zone,Erdaojing-Honggeermiao tectonic zone and Late Paleozoic Sunite Left Banner-Xilinhaote tectonic zone.Another geological-geophysical profile named Tuchengzi-Hegenshan also passed through several tectonic units which were Suolun-Xilinhaote tectonic zone and south Mongolia-Great Khingan tectonic zone including Erenhot-Hegenshan ophiolitic mélange zone.The study area experienced three major tectonic phases such as Precambrian,Paleozoic and Mesozoic,and different tectonic units presented spatial superposition.Two first-degree(?)tectonic units could be recognized in the Pre-Mesozoic evolutionary phases,that were Tianshan-Xingmeng(Great Khingan-Mongolia)orogenic system and North China continental segment.These two units contained 4second-degree(?)tectonic units and 2 second-degree(?)tectonic units,respectively.One first-degree(?)tectonic units named mid-east Mogolia tectonic unit could be recognized in the middle Mesozoic phase,which contained 4 second-degree(?)tectonic units.Based on the distribution of major tectonic zones and division of major metallogenetic units in the study area,we presented 10 third-degree(?)metallogenetic zones and 25 fourth-degree(?)metallogenetic zones.Additionally,we promoted and evaluated the metallogenetic prospects of 6 major zones.