滇西铜厂沟斑岩钼铜矿床成矿地质条件及综合找矿模型  

Metallogenic Geological Conditions and Comprehensive Prospecting Model of Tongchanggou Porphyry Mo-Cu Deposit in Western Yunnan

作　　者：余璨 吕晓宏 赵向东 赵献昆 祝伟 YU Can;LYU Xiaohong;ZHAO Xiangdong;ZHAO Xiankun;ZHU Wei(China Nonferrous Metals Industry Kunming Survey and Design Institute)

机构地区：[1]中国有色金属工业昆明勘察设计研究院,云南省昆明市650051

出　　处：《现代矿业》2022年第3期34-39,59,共7页Modern Mining

基　　金：中国有色金属工业昆明勘察设计研究院有限公司科研项目(编号:2019YN11)。

摘　　要：铜厂沟斑岩铜钼矿床是义敦岛弧南缘格咱岛弧成矿带的重大找矿突破,显示出巨大的找矿潜力。为进一步查明矿床成矿条件和成矿机理,在1∶1万磁测、1∶5万土壤化探测量的基础上,对铜厂沟矿区进行了矿产勘查工作。结果表明:(1)燕山期花岗岩叠加于印支期斑岩带之上,伴随着强烈多金属成矿作用,铜厂沟钼铜多金属矿床属燕山期中性—酸性岩浆作用相关的斑岩型—矽卡岩型多金属矿床;(2)矿区主要出露二叠系、三叠系地层,断裂构造发育,矿床由隐伏于铜厂坪以北的花岗闪长斑岩、石英闪长玢岩组成,Mo-Cu矿化主要产于斑(玢)岩体及围岩接触带内,矿体呈似层状、透镜状、细脉状产出;(3)矿区成岩、成矿严格受控于地质构造,主干断裂是有利的热液运移通道,次级断裂是控矿、成矿和储矿的有利部位;(4)矿区圈定土壤化探异常与磁测异常套合良好,矿化带和斑岩体均分布于物化探异常范围内。在前述分析的基础上,结合矿床地质特征、矿床成矿条件,构建了矿床综合找矿模型,并据此提出主次断裂构造交汇部位以及围岩接触带是下一步勘查工作重点。The Tongchanggou porphyry copper-molybdenum deposit is a major prospecting break⁃through in the Geza Island arc metallogenic belt at the southern margin of the Yidun Island Arc,showing a huge prospecting potential.In order to further find out the metallogenic conditions and metallogenic mecha⁃nism of the ore deposit,on the basis of 1∶10000 magnetic survey and 1∶50000 soil chemical detection da⁃ta,mineral exploration work is carried out in the Tongchanggou mining area.The results show that:(1)The Yanshanian granite is superimposed on the Indosinian porphyry belt,accompanied by strong polyme⁃tallic mineralization,and the Tongchanggou molybdenum-copper polymetallic deposit belongs to the Yan⁃shanian neutral-acid magmatism-related porphyry-silica Kar-type polymetallic deposit;(2)The mining area mainly exposes Permian and Triassic strata,with developed fault structures.The deposit consists of granodiorite porphyry and quartz diorite porphyrite hidden in the north of Tongchangping.Mo-Cu mineral⁃ization is mainly produced in the porphyry(porphyry)rock body and the contact zone of the surrounding rock,and the ore body is like layered,lenticular,and veinlet-like;(3)The diagenesis and mineralization of the mining area are strictly controlled by the geological structure,and the main Faults are favorable hy⁃drothermal migration channels,and secondary faults are favorable locations for ore-control,ore-forming and ore-storage;(4)The geochemical and magnetic anomalies of the delineated soil in the mining area are well fitted,and the mineralized zones and porphyry bodies are distributed equally within the anomalous range of geophysical and geochemical exploration.On the basis of the above analysis,combined with the geological characteristics of the deposit and the metallogenic conditions of the deposit,a comprehensive prospecting model of the deposit was constructed,and based on this,it is proposed that the intersection of primary and secondary fault structures and the contact zone of surrounding rock are the f

关 键 词：钼铜矿床 矿产勘查 成矿条件 找矿模型 

分 类 号：P618.65[天文地球—矿床学] P618.41[天文地球—地质学]