滇南宋家坡铜矿矿床地质特征及找矿前景  

Geological Characteristics and Prospecting Potential of Songjiapo Copper Deposit in Southern Yunnan Province

作　　者：李正章 Li Zhengzhang(Yunnan Copper Mineral Resources Exploration Development Co.,Ltd.)

机构地区：[1]云南铜业矿产资源勘查开发有限公司,云南省昆明市650051

出　　处：《现代矿业》2020年第4期30-33,40,共5页Modern Mining

摘　　要：民乐宋家坡铜矿位于云南省景谷县西北部,地处兰坪—思茅褶皱系内子马—景谷复式向斜西侧,成矿条件良好.矿床已发现的Ⅰ、Ⅱ、Ⅲ3个矿化层赋存于中三叠统宋家坡组地层中,容矿岩石主要为流纹质熔结凝灰岩(T2 s2λ)、晶屑凝灰岩(T2 s1λ),钾硅化、碳酸盐化、绢云母化、硅—千枚岩化等围岩蚀变与矿化关系密切.结合区域成矿背景、矿区地质特征及相关工作成果,发现矿(化)体严格受控于地层岩性、断裂及劈理化构造带,早期形成透镜状、似层状矿体,后期构造活动致使局部矿段叠加富化为次生淋滤富铜矿体,矿床属于火山—次火山交代为主的次生富集铜矿床.矿区大独田、老八田、一厂、荒田等地断裂旁侧、蚀变发育地段为矿化富集区,建议对该类找矿靶区进一步开展工程验证,并加强对Ⅲ号矿化带南延部分富矿体的探寻工作,有望实现找矿突破.Sonjiapo-Minle Copper Deposit is located in the northwest of Jinggu County,Yunnan Provinc,it is distributed in west side of Zima-Jinggu multiple syncline of Lanping-Simao fold-system,which has the superior metallogenic condition.The founded three mineralized-layers(Ⅰ,Ⅱ,Ⅲ)are occurred in Sonjiapo Formation of Middle Triassic.The ore-hosted rocks are rhyolitic ignimbrite(T 2s 2λ)and crystal tuff(T 2s 1λ),and the alteration are closely related to the mineralization,such as potassic-silicification,carbonation,sericitization and silicification-dolomitization.Based on the regional geological characteristics and the above geological working results of the mining area,it is found that the ore-body(mineralization)are mainly controlled by formation lithology,fault and cleavage belt.The lenticular ore and stratiform-like ore are developed in early mineralzation period,and the secondary-leaching bonanza are developed in late stage,by effected tectonic activity,which is belongs to volcanism-subvolcanism-supergene deposit.The sides of fracture and the development area of alteration in Dadutian.Laobatian,Yichang,Huangtian area can be taken as the mineralization enrichment areas.Based on the above discussion results,it if further suggested that some related engineering verification work can be in this mineralization enrichment areas,and strengthening work in the south extendible-portion of No.Ⅲmineralization zone,the prospecting breakthrough will be realized.

关 键 词：铜矿 火山—次火山 地质特征 找矿标志 找矿方向 

分 类 号：P618.41[天文地球—矿床学]