藏南扎西康铅锌多金属矿床控矿因素及找矿预测

发布时间：2018-04-24 21:25

本文选题：控矿因素 + 成矿物质来源　；参考：《金属矿山》2016年10期

【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。
[Abstract]:The Zaxikang Pb-Zn polymetallic deposit is one of the most important hydrothermal vein deposits in the antimony and gold metallogenic belt of southern Tibet. The ore-controlling factors of the deposit and the geological, geochemical and geophysical characteristics of the concealed orebodies discovered have been systematically analyzed. It is considered that the occurrence of the orebodies in the Zaxikang Pb-Zn polymetallic deposit is strictly controlled by the NW-SE high angle normal faults near SNN. The formation of J _ (1-2l) and the dome of tinted granite in the southern part of the mining area provide a material source for the mineralization. On the basis of the above analysis, according to the characteristics of the concealed orebodies which have been successfully explored, the comprehensive prospecting prediction marks, I. e., the outcrop of the surface iron cap, are summed up. The strong geochemical anomalies of soil and the strong anomalies of Pb Zn and Audio-frequency magnetotelluric sound (AMTT) profile of Audio-frequency (Audio-frequency magnetotelluric sound) profile are obvious, and the ore-prospecting work on a large scale has been carried out. A similar synthetic anomaly zone was found east of the 40# exploration line and the prospecting target area was delineated. The results show that the Zaxikang deposit is a hydrothermal vein type lead-zinc polymetallic deposit with fault structure as the main controlling factor. The comprehensive prospecting and prediction methods of geology, geochemistry and geophysics have achieved remarkable results in the exploration of concealed orebodies. The delineated ore-prospecting target area can be used as the key work area for ore prospecting and exploration in the next step.
【作者单位】：成都理工大学地球科学学院;中国地质调查局成都地质调查中心;中国地质大学(北京)地球科学与资源学院;
【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)
【分类号】：P618.2

【相似文献】