西藏罗布莎地区地球物理异常与铬铁矿成矿特征及成矿预测  

Metallogenic Characteristics and Metallogenic Prediction of Chromite and Geophysics Anomaly in Luobusha Region,Tibet

作　　者：马文鑫 何胜 苏世杰 路瀚 MA Wenxin;HE Sheng;SU Shijie;LU Han(Qinghai Bureau of Environmental Geology Exploration,Xining,Qinghai 810007,China;Qinghai Provincial Key Lab of Geo-Environment,Xining,Qinghai 810007,China;School of Geophysics and Geomatics,China University of Geosciences,Wuhan,Hubei 430074,China;Northwest Geological Survey Institute of China Metallurgical Geology Bureau,Xi’an,Shanxi 710119,China)

机构地区：[1]青海省环境地质勘查局,青海西宁810007 [2]青海省环境地质重点实验室,青海西宁810007 [3]中国地质大学(武汉)地球物理与空间信息学院,湖北武汉430074 [4]中国冶金地质总局西北地质勘查院,陕西西安710119

出　　处：《中国锰业》2023年第4期74-82,88,共10页China Manganese Industry

基　　金：中国地质调查局地质矿产调查项目(编号:1212011221069);青海省环境地质勘查局科技项目(编号:青环地局[2021]43号)。

摘　　要：重磁电异常信息是地壳内物质密度、磁性、电性的综合反映,通过重磁电综合地球物理异常特征分析,揭示了罗布莎地区东西向构造带是早期形成的构造体系,雅鲁藏布江缝合带是区内构造格架基础,是主控断裂构造。综合地球物理方法在雅鲁藏布江蛇绿岩带上圈定超基性岩体的效果(攻深找盲)比较明显,结合其他研究资料,为罗布莎地区铬铁矿成矿远景区做出预测和靶区圈定,划分该区域铬铁矿成矿远景区4个,圈定三级成矿靶区6处。将罗布莎地区自北向南划分为3个构造分区,即冈底斯-念青唐古拉板片南缘、雅鲁藏布江缝合带、喜马拉雅板片北缘,通过构造分区反映了成岩、成矿演化的时空分布规律。研究为西藏罗布莎地区铬铁矿、铜多金属矿及非金属矿等矿产资源的调查评价提供了物探基础资料。The gravity,magnetic and electrical anomaly information is a comprehensive reflection of the material density,magnetism and electrical properties in the crust.Through the analysis of the characteristics of the gravity,magnetic and electrical comprehensive geophysical anomaly,it is revealed that the east-west structural belt in the Luobusha area is an early formed structural system,and the Yarlung Zangbo River suture belt is the basis of the regional structural framework and the main controlling fault structure.The effect of comprehensive geophysical methods in delineating ultrabasic rock bodies(drilling and blind finding) on the Yarlung Zangbo River ophiolite belt is obvious.Combined with other research data,the prediction and target area delineation are made for the chromite mineralization prospective area in Luobusha area,which is divided into 4 chromite mineralization prospective areas and 6 tertiary mineralization targets.The Luobusha area is divided into 3 tectonic subzone from north to south,namely the southern margin of Gangdise Nianqing Tanggula plate,the Yarlung Zangbo River suture zone,and the northern margin of Himalayan plate.The tectonic subzone reflect the space-time distribution law of diagenesis and mineralization evolution.The study provides basic geophysical data for the investigation and evaluation of chromite,copper polymetallic ore and non-metallic ore resources in Luobusha area,Tibet.

关 键 词：重力异常 磁异常 激电异常 成矿特征及演化 成矿预测 靶区圈定 

分 类 号：P618.3[天文地球—矿床学]