辽西八道壕煤系底部火山岩SHRIMP年龄及其意义

SHRIMP U-Pb isotope age of volcanic rocks distributed in the Badaohao area, Liaoning Province and its significance

    摘要
  • 摘要: 辽宁黑山县八道壕煤盆地以东分布着一套安山质火山岩系,其时代及其与早白垩世八道壕组含煤地层的上下层序关系一直存在着争议,这直接影响阜新盆地外围的找煤方向。采用SHRIMP法,通过对该火山岩中锆石颗粒的U-Pb同位素分析测定,可知其U-Pb同位素年龄分别为124.9±2.9Ma和125.7±1.7Ma,显示该火山岩层位相当于早白垩世义县组,是八道壕组的下伏地层。

     

    Abstract: A set of andesite volcanic rocks distributes in the Badaohao area in Heishan County,Liaoning Province.It’s geological age and stratigraphy sequence relationship between the Lower Cretaceous Badaohao Formation and the volcanic rocks can not make sure till now and is influencing the further prospect for coals.Zircon particles are sorted out from the samples and measured by using the SHRIMP method.The U-Pb isotopic age of these two sam-ples are 124.9±2.9Ma and 125.7±1.7Ma,belonging to Early Cretaceous Yixian Formation and is underlain the Badaohao Formation.

     

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