北秦岭华阳川地区重磁三维反演及岩浆岩特征研究

Three-dimensional gravity and magnetic inversion of magmatic rocks in the Huayangchuan,North Qinling area

华山岩体、老牛山杂岩体等中酸性花岗岩体和华阳川韧性剪切带在北秦岭华阳川地区的成矿过程中起着重要的作用,既是构造演化的记录,又是构造—岩浆—成矿的重要指示。本文在系统研究华阳川地区地面和航空重力、磁测数据以及地面电法剖面等多种地球物理资料的基础上,完成物性统计分析、航空和地面数据融合处理,通过先验信息约束的重磁2.5D交互式反演和三维反演计算,构建了华阳川地区区域三维地质—地球物理模型,为区域地质背景和深部地质构造的研究提供地球物理依据;推断解释了华山岩体、老牛山岩体和华阳川韧性剪切带的三维形态和空间分布,探讨了华阳川韧性剪切带、老牛山岩体和华山岩体的深部接触关系,对大岩体外围接触带的铀、钼等矿床的深部找矿具有一定指导意义。

Huashan rock mass,Laoniushan complex and Huayangchuan ductile shear zone play an important role in the process of mineralization in Huayangchuan area of North Qinling Mountains.They are not only a record of tectonic evolution,but also an important indicator of tectono-magmatic mineralization.In this paper,based on the systematic study of the surface and airborne gravity,magnetic survey data,and surface electrical section and other geophysical data in Huayangchuan area,statistical analysis of physical properties;merge aviation data and ground data;and proceed 2.5 dimensional interactive inversion and three dimensional inversion with prior information constraints.The regional three-dimensional geology-geophysics model of Huayangchuan area is constructed,which provides the geophysical basis for the study of regional geological background and deep geological structure.Inference and interpretation of Huashan rock mass,Laoniushan complex and Huayangchuan ductile shear zone of the three dimensional shape and spatial distribution.This paper has analyzed and discussed the deep contact relationship among huayangchuan ductile shear zone,Laoniushan rock mass and Huashan rock mass,which has certain guiding significance for deep prospecting of uranium,molybdenum and other deposits in the peripheral contact zone of the large rock mass.