义马-硖石断带的演化特征及其地质意义

THE GEOLOGICAL EVOLUTION AND SIGNIFICANCE OF YIMA FAULT ZONE

  • 摘要: 义马断带位于华北煤田的西南边界,由一系列近于平行的走向北西西,倾向南西的逆断层所构成,上盘为O1-Pt地层,下盘为C—P煤系及著名的义马侏罗纪含煤盆地。据断带的构造、岩浆活动特征及下盘C—K古水流演化,作者认为,该断带萌生于海西期;印支末期强烈活动,致使义马盆地形成;定型于燕山晚期构造运动。随时间推移,断带在空间上则由南北发展,并在断带下盘派生出多条沿煤系煤层发育的缓倾角逆断层,上盘漂浮于煤层之上。因此,在不同地段,断带之下可能赋存有一定量的C、P和J煤层。

     

    Abstract: Yima fault zone is the border faults between Qinling fault-fold zone and fault block of North in China. It includes a series of approximately parallel thrust faults. It’s hanging are Ordorician-Precambrian strata and footwall are Carboniferous-Cretaceous system. Yima fault zone moved for a long history:It origined in Variscan movement,instentely moved in Indosinian movement and take shaped in Yanshanian movement. With the elapse of time, the fault zone developed from south to north, but formed thrust faults along coal seam and the order strata of hanging floated on the coal seam. It is possible there is sure amount of coal under the hanging.

     

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