那陵郭勒河下游重磁异常与铁多金属矿找矿预测  

Gravity and Magnetic Anomalies and Prospecting Prediction of Iron Polymetallic Deposits in the Downstream of Nalingguole River

作　　者：李凤廷 苗虎林 付佳 赵勇 喻忠鸿 马彪 LI Fengting;MIAO Hulin;FU Jia;ZHAO Yong;YU Zhonghong;MA Biao(No.3 Exploration Institute of Geology Resources of Qinghai Province,Xining 810029,Qinghai,China;QH West Regions Lucky-Dragon Mining Co.,Ltd,Xining 810001,Qinghai,China)

机构地区：[1]青海省第三地质勘查院,青海西宁810029 [2]青海西域祥龙矿业有限公司,青海西宁810001

出　　处：《西北地质》2023年第6期155-165,共11页Northwestern Geology

基　　金：青海省第三地质勘查院项目“青藏高原北部重力异常与高程的相关性试验与研究”(SKYZC-2022-005)资助。

摘　　要：那陵郭勒河下游地区以第四系覆盖为主,已发现多个铁多金属矿床,同时受覆盖的影响,找矿工作难度增大。笔者以1∶5万航磁及1∶20万区域重力资料研究分析了那陵郭勒河下游重磁异常的展布特征,推断了研究区的断裂构造;根据南部基岩出露区地层、岩体与重磁场的关系,推断划分了覆盖区下地层及侵入岩的分布情况。结合地质特征与矿产的分布关系,认为中、小型铁多金属矿床分布主要与中部圈定的岩体密切相关,且位于推断岩体的边部,矿(化)点主要分布于推断断裂的附近,受断裂控制明显。圈定找矿靶区2处,为后期柴达木盆地周缘覆盖区(半覆盖区)的找矿及靶区优选提供有利的证据。The downstream area of the Nalingguole River is predominantly covered by Quaternary sediments.Several polymetallic ore deposits,primarily composed of iron,have been discovered in this region.However,the presence of sediment cover has increased the difficulty of prospecting activities.In this study,the author analysied of the distribution characteristics gravity and magnetic anomalies,and inferred the fault structure of the study area in the downstream structures of the Nalingguole River,focusing on 1∶50,000 aeromagnetic anomaly data and 1∶200,000 regional gravity data.Based on the relationship between strata,rock mass,gravity and magnetic field in the southern bedrock outcropping area,deduced and divided the distribution of strata and intrusive rocks under the overlying area.Moreover,the mineral occurrences are predominantly found near inferred fault lines,indicating a clear influence of fault control.Two prospective mining targets were identified,providing favorable evidence for future ore exploration and target selection in the(partially)covered areas surrounding the Qaidam Basin.

关 键 词：重磁异常 断裂构造 矿产分布 覆盖区 那陵郭勒河下游 

分 类 号：P631.1[天文地球—地质矿产勘探] P618.31[天文地球—地质学]