基于重力异常的镇安西部隐伏岩体空间分布规律研究  

Spatial distribution patterns of concealed plutons in the western Zhen’an area based on gravity anomalies

作　　者：张瑾爱 杨渊 张林 ZHANG Jin-Ai;YANG Yuan;ZHANG Lin(Shaanxi Mineral Resources and Geological Survey,Xi'an 710068,China)

机构地区：[1]陕西省矿产地质调查中心,陕西西安710068

出　　处：《物探与化探》2023年第3期618-627,共10页Geophysical and Geochemical Exploration

基　　金：陕西省地质勘查基金项目“陕西省镇安西部整装勘查区基础地质调查”(61201707318)。

摘　　要：镇安西部钨钼等多金属矿成矿条件优越,区内发现了如东阳、棋盘沟、桂林沟、月河坪、核桃坪等一批大中型钨钼矿,其成矿原因与侵入岩体有关。为了寻找钨钼矿体,必须开展与成矿有关的侵入岩体的研究,特别是对隐伏岩体的研究。本文基于高精度重力数据,利用最小曲率位场分离方法提取了隐伏岩体的重力异常,结合出露岩体的地球物理特征,对镇安西部隐伏岩体的平面位置进行了研究。通过研究,识别出了懒板凳、沙坪村、月河台、东川街和黄金美5个隐伏岩体。对典型隐伏岩体进行了3D重力异常反演,得到了隐伏岩体的空间展布特征,其中月河台和懒板凳东隐伏岩体均已得到了钻孔验证,孔内见到的黑钨矿品位较好。本文的研究方法可为该地区乃至其他地区隐伏岩体的研究提供技术支撑,同时也为南秦岭成矿带构造—岩浆—成矿演化研究提供重要资料。The western Zhen'an area enjoys superior ore-forming conditions of tungsten-molybdenum polymetallic deposits.A batch of large and medium-scale tungsten-molybdenum deposits such as Dongyang,Qipangou,Guilingou,Yueheping,and Hetaoping,have been discovered in this area,and they are related to intrusions.To explore tungsten-molybdenum ore bodies,it is necessary to carry out studies on intrusions related to mineralization,especially concealed intrusions.Based on high-precision gravity anomalies,this study extracted the gravity anomaly data of concealed plutons using the minimum curvature potential field separation method.Moreover,it investigated the plane positions of the concealed plutons in the western Zhen'an area by combining the geophysical characteristics of the exposed plutons,identifying five concealed plutons,namely Lanbandeng,Shapingcun,Yuehetai,Dongchuanjie,and Huangjinmei,through investigation.Moreover,this study conducted the 3D gravity anomaly inversion for typical concealed plutons,determining the spatial distribution characteristics of the concealed plutons.The Yuehetai and eastern Lanbandeng concealed plutons have been verified through boreholes,with high-grade wolframite being discovered.The method proposed in this study can provide technical support for the study of concealed plutons in the Zhen'an area and other areas,as well as important data for the study of the tectonic-magmatic-metallogenic evolution of the southern Qinling metallogenic belt.

关 键 词：重力勘探 隐伏岩体 深部找矿 3D重力反演 

分 类 号：P631[天文地球—地质矿产勘探]