摘要
扎西康铅锌多金属矿床是藏南锑金成矿带内最重要的热液脉型矿床之一,在野外详细地质调查及室内综合分析的基础上,系统分析了矿床控矿因素以及已发现的隐伏矿体的地质、地球化学、地球物理特征,认为扎西康铅锌多金属矿床矿体的产出严格受近SN、NW—SE向高角度正断层控制,陆热组(J1-2l)地层及矿区南部的错那洞淡色花岗岩穹窿共同为成矿提供了物质来源。在上述分析的基础上,根据已成功勘查出隐伏矿体的特征归纳了综合找矿预测标志,即地表铁帽露头、土壤地球化学强异常(Pb+Zn强异常)、音频大地电磁测深(Audio-frequency magnetotelluric sounding,AMT)剖面上明显的电性突变界面(含矿断裂构造),并进行了大比例尺找矿预测工作,在40#勘探线以东发现了类似的综合异常带,并圈定了找矿靶区。研究结果表明:扎西康矿床是以断裂构造为主控因素的热液脉型铅锌多金属矿床,地质、地球化学、地球物理综合找矿预测方法在隐伏矿体勘查过程中成效显著,所圈定的找矿靶区可作为矿区下一步找矿勘查的重点工作区。
Zhaxikang Pb-Zn polymetallic deposit is one of the most important hydrothermal vein type deposits in southern Tibet gold antimony metallogenic belt. Based on the detailed filed geological survey and indoor comprehensive analysis,the orecontrolling factors and the geological characteristics,geophysical characteristics and geochemical characteristics of the concealed ore-bodies that have been found in the mining area are analyzed synthetically,it is show that output of the ore-bodies of Zhaxikang Pb-Zn polymetallic deposit are strictly constrained by the two normal fault of high angle,which trending direction is SN and NW-SE,the metallogenic materials of Zhaxikang Pb-Zn polymetallic deposit are derived from lower-middle Jurassic Lure formation（ J1- 2l） and the Cuonadong leucogranite vault in the south of the mining area. Based on the above analysis results,according to the geological characteristics of the concealed ore-bodies that have been prospected in the mining area,the comprehensive prospecting factors of Zhaxikang Pb-Zn polymetallic deposit are summarized,which include outcrop of surface gossan,strong soil geochemical anomalies（ Pb,Zn anomalies） and the electronic mutation interface（ ore-bearing fault） in the audio-frequency magnetotelluric sounding（ AMT） section,besides that,the prospecting prediction work with large scale is done,the similar comprehensive anomalies belt in the east of 40#exploration line,and the prospecting target area is delineated. The study result show that Zhaxikang deposit is a hydrothermal vein type Pb-Zn polymetallic deposit which is strongly controlled by faults,the ideal prospecting effects of the prospecting of concealed ore-bodies by using geological,geochemical and geophysical methods,the target area that is delineated by the methods can be treated as the important working area of the further prospecting work in the mining area.
出处
《金属矿山》
CAS
北大核心
2016年第10期103-108,共6页
Metal Mine
基金
国家重点基础研究发展计划项目(2016YFC0600308)
中国地质调查局地质调查项目(DD20160015)
关键词
控矿因素
成矿物质来源
找矿预测标志
综合异常带
找矿靶区
Ore-controlling factor
Source of metallogenic material
Prospecting prediction factor
Comprehensive anomaly belt
Prospecting target area
