哀牢山南段长安金矿区矿化类型及富集规律  

Mineralization type and enrichment regularity in Chang’an gold mining area in South Ailaoshan

作　　者：王利东[1] 周云满[1] 王菡 WANG Lidong;ZHOU Yunman;WANG Han(Yunnan Gold&Mining Group Co.,Ltd.,Kunming 650229,Yunnan,China)

机构地区：[1]云南黄金矿业集团股份有限公司,云南昆明650299

出　　处：《矿产与地质》2020年第5期869-879,共11页Mineral Resources and Geology

基　　金：云南省“云岭学者”科研项目(云组通〔2015〕56号,2016-2020年)资助

摘　　要：云南长安金矿床位于哀牢山金矿带南段。通过对长安金矿区内矿体地质特征、矿化类型特征进行系统分析,总结了金的矿化模式和富集规律。将该矿区内已发现的57个似层状、透镜状、脉状、囊状金矿体的矿化类型归结为4型16类。长安金矿处于铜厂、长安冲两个喜马拉雅期石英正长斑岩体热液成矿系统的外带,F 6等断层破碎带、喜马拉雅期岩浆岩体(脉)接触带、早期的辉绿岩和煌斑岩脉是金矿化富集的有利部位,对应地往往形成构造破碎带蚀变岩型(四类)、岩体接触带型(九类)、蚀变岩体型(两类)金矿(化)体,各类金矿(化)体露头遭受风化剥蚀在其附近山坡、沟谷、山坳洼地中形成第四系残坡积土型(一类)金矿化体。向阳组二段、南板河组的砂岩、含砾砂岩是金成矿有利地层岩性,断裂构造+有利的地层岩性+岩浆岩“三位一体”叠加的部位易富集形成富厚的工业金矿体。Chang’an gold deposit is located in the southern section of Ailaoshan gold belt in Yunnan.Based on the systematic analysis of the geological characteristics of orebody and mineralization type,the mineralization model and enrichment regularity are summarized.There are more than 57 gold orebodies of stratiform,lenticular,veined or csytiform shape in the mining area,which are classified into four types and 16 categories.Chang’an gold deposit is located in the outside zone of hydrothermal metallogenic system of quartz syenite porphyry bodies of Tongchang and Changanchong Himalayan period.F 6 fault zone,contact zone of Himalayan magmatic rock body(vein),and early diabase and lamprophyre vein are favorable locations for gold mineralization and enrichment.Correspondingly,structural fracture zone and altered rock type(four types),rock contact zone type(nine types),and altered rock body type(two types)are often formed.All kinds of gold orebody outcrops are suffered weathering and denudation to form Quaternary residual slope soil type(one type)gold mineralization body in nearby hillsides,valleys,and depressions.The sandstone and gravel-bearing sandstone of the second segment of Xiangyang Formation and Nanbanhe Formation are favorable stratigraphic lithology for gold mineralization.In the superimposed part of fault structure+favorable stratigraphic lithology+magmatic rock,it is easy to be enriched to form rich industrial gold orebodies.

关 键 词：长安金矿 矿化类型 富集规律 哀牢山南段 

分 类 号：P618.51[天文地球—矿床学]