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    北山大地构造深部成因与浅部成矿特征遥感综合分析

    A remote sensing analysis of deep genesis of geotectonics and shallow ore-forming characteristics in the Beishan Mountain

    • 摘要: 提要:大地构造受地球深部动力活动控制这个观点早已为人们所接受。本文通过对地处新疆、甘肃、内蒙三省(区)交汇部位的北山及附近地区大地构造的综合分析,认为北山地区在构造上形成于塔里木、中朝与蒙古三大板块构造汇聚挤压环境,但对其影响最为主要的是塔里木板块的向北移动造成的北山地区的古洋闭合。同时,进一步的深部构造运动使塔里木板块向北俯冲北山造山带,造成北山造山带的断裂构造具有多向北倾的特点。这种区域性的由南向北挤压俯冲构造对于浅部成矿具有重要影响。已知的许多矿床均分布于规模较大的中酸性岩基北侧,并多与北倾逆冲断裂带及小岩株(群)关系密切,由于与断裂构造具有多向北倾,使得与成矿作用有关的岩基总体上也具有向北倾的特征,并导致后来的成矿岩浆能够侵入就位在岩基北缘,这为人们在类似地区寻找与岩浆活动有关的矿床提供了一种重要找矿方法和线索。

       

      Abstract: Abstract:The view that geotectonics was controlled by deep dynamic action of the earth has long been accepted, because the compression between Tarim Plate, Sino-Korea Plate and Mongolia Plate resulted in the formation of the Beishan orogenic belt, which has been evidenced by a comprehensive analysis of regional tectonics in Beishan Mountain and its adjacent areas. The closure of Beishan paleo-ocean resulting from the northward migration of the Tarim Plate seems to have been the main reason. Furthermore, the subduction of the Tarim Plate into the Beishan orogenic belt caused the northward dipping of thrust faults in this area. These activities had much to do with the mineralization in shallow places. The authors analyzed the distribution of ore deposits in Beishan area and found that many large ore deposits occur on the northern side of the acid batholith and are closely associated with northward dipping thrust faults and stocks. The acid batholith related to mineralization also has northward dipping characteristics, and hence the ore-forming magma could be emplaced on the northern side of the batholith. These ore-forming features provide important means and clues to the prospecting work in similar areas.

       

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