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On the Tectonic Evolution and the Metallogenesis of the Palaeozoic Continental Margin in the North side of North China Platform

Hu Xiao  
The continental margin of Palaeozoic Era in the north Side of North China Platform underwent mainly three Phases of tectonic evolution. Among which there were two plate activities, transformation from geosyncline to platform and continental crust creation in Early Palaeozoic Era. The connection of the created continental crust in the north margin of the Nerth China Platform with created continental crust in the south margin of the Siberia Platform took place from the Late Devonian Epoch to Ear-y Carboniferous Epoch. The partition belt was located the Halatumiao line in the north of Hegenshan—Erlianhaote, Inner Mongolia, and further westward the belt linked with the Mid—Palaeozoic ophiolite belt of the northern margin of Tianshan Mountain, Mongolia Gobi. The ages of the three ophiolite belts in the Palaeczcie folded region of Inner Mongolia tended to be younger in proper order northwards, which were Carmbrian, Ordovician period and Late Devonian—Early Carboniferous epoch respectively. The duration of the corresponding tectonic emplacement or underthrusting and connection was from Middle—Late Ordovician to Early Silurian Epoch, Middle-Iate Silurian to Early Devonician Epoch。 Late Devonician to Early Carboniferous Epoch. The research for both the forming epochcs and the geologic characteristics all of the ophioIite(belt), ancient island—arc rock Sequence, flysh formation as well as molasse formation has proved that there existed a coledonian folding belt in the north side of North China Platform whose northern border was locate in the south of the Suolun Mountain—Sunite Zuoqi—Xilinhaote. The facts above mentione have made clear that the plate underthrusting and Caledonian mountain folding displaced and developed eastwardly. The main phase of the strong tectonic movement took place at the Middle Ordovician-Late Silurian Epoch. The three tectonic evolutions in the north side of North China Platform had formed their Ore-forming series and metallogenetic belts respectively. The tectono—metallogenic series of southern belt was intergrated, which included not only the Cr—Ni, Fe-Mn-P Series associated with ophiolite formation, but also the Cu—Mo—Au series of transtional crust type. Beginning from ocean crust towards continental crust(from north to south), Fe, Cr, Cu(Me)、Au developed in turn、Each invoived a series of ore deposits and mineralized localities. The middle belt was merely a Cr-Feore Zone associated with ophiolite formation, whereas the northern belt was characterized by Cr ore.
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【Co-references】
Chinese Journal Full-text Database 10 Hits
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