摘要
铁格隆南铜(金)矿床是近年来在班公湖-怒江成矿带西段多龙矿集区新发现的超大型Cu(Au-Ag)矿床。本文针对铁格隆南矿区深部找矿问题,以现代成矿地质理论和多元地学信息综合分析技术为支撑,以构建矿床找矿模型为指导,依托数据库技术、3S技术、三维建模与可视化技术及地质统计学理论与方法,开展基于矿产地质、地球物理、地球化学等成矿条件及找矿标志的三维地质实体建模与矿化异常三维空间重构,将铁格隆南矿床的预测评价研究拓展到三维空间,揭示了区内成矿地质特征、地球化学及地球物理异常表征,据此探讨了矿床的成因及矿体分布特征。并在此基础上,开展了矿区的地质-地球化学-地球物理综合信息分析与预测评价,以期减少单一信息多解性和成矿条件不确定性,为铁格隆南矿区深部找矿工作提供参考。研究结果表明:在地质找矿模型指导下,基于深部成矿空间三维结构重构基础上的三维地质、地球物理、地球化学异常信息提取与综合分析,可以有效的识别成矿地质体和矿致异常信息,实现深部矿产资源靶区空间定位预测,为深部找矿预测研究提供了新思路。综合分析结果显示铁格隆南矿床深部找矿潜力巨大。
The Tiegelongnan deposit, located in Duolong ore-concentrated area of the western Bangong Co-Nujiang metallogenic belt, is the first discovered super large porphyry-high sulfidation epithermal type Cu (Au-Ag) deposit in Qinghai-Tibet Plateau. In this paper, three-dimensional (3D) modeling of the Tiegelongnan deposit and its mineralization anomaly was carried out. Guided by the prospecting model of this deposit, the 3D geological bodies, 3D grade model of ore bodies and geophysical exploration model were built in this study based on combined analysis upon the geological, geochemical and geophysical data in this deposit, and used the database technology, 3S technology, and 3D modelling and visualization technology. These models reveal the metallogenic geological features, geochemical and geophysical anomaly characterization of this deposit, and thus the genesis and distribution of ore bodies are disclosed. In order to reduce the uncertainty of the prospecting information and metallogenic conditions, the 3D prospectivity modelling of the Tiegelongnan copper-gold deposit was carried out by the comprehensive information analysis and prediction of geology, geochemistry and geophysics in the study area. The results show that the ore bodies of the Tiegelongnan Cu deposit are mainly hosted in the porphyries and the contact zone of the feldspathic quartz sandstone and porphyries. There are two high value areas of Cu grade block model in the vertical direction, indicating an overlapped metallogenic characteristics. The intensity of Cu mineralization in the Tiegelongnan deposit is closely associated with alteration zonation. Cu and Au elements have a good spatial matching relationship. The low resistivity anomaly of AMT is interpreted to be good exploration criteria of 3D prospectivity modelling of the Tiegelongnan Cu deposit. The 3D prospectivity modelling results show that there is a great potential for finding more Cu in the depth of the Tiegelongnan deposit. Meanwhile, the integration of 3D exploration data is important for targeting deep-seated mineral deposits. Guided by the prospecting model and based on the reconstruction of 3D structure of deep metallogenic space, 3D prospectivity modelling carried out by extraction and comprehensive analysis of 3D geological, geophysical and geochemical anomaly information, can effectively identify ore-forming geological bodies and anomaly information, and it can be used to identify targets at significant depth. It is believed that the proposed approach provides a valuable guide to the identification of new deposit-scale, deep-seated exploration target zones.
作者
于萍萍
陈建平
王勤
YU PingPing;CHEN JianPing;WANG Qin(Chirm Unii'ersity of (reosciences, Beijing 100083, China;College of Earth Sciences, Chengdu University of Technology, Chengdu 610059 , China;Institute of Mineral Resources , Chinese Academy of Geological Sciences, Beijing 100037 , China)
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
2019年第3期897-912,共16页
Acta Petrologica Sinica
基金
国家重点研发计划项目(2018YFC0604106
2017YFC0601502)
中国地质调查局项目(DD20179142
DD20160026)联合资助
