云南宁蒗长湾金矿地质特征及成因浅析  

GEOLOGICAL CHARACTERISTICS AND GENESIS OF THE CHANGWAN GOLD DEPOSIT IN NINGLANG,YUNNAN

作　　者：马劼 白曜宇 MA Jie;BAI Yao-yu(Yunnan Institute of Land and Resources Planning and Design,Kunming 650051;Yunnan FushengXinxin Investment Co.,Ltd.,Kunming 650021)

机构地区：[1]云南省国土资源规划设计研究院,云南昆明650051 [2]云南富盛锌鑫投资股份有限公司,云南昆明650021

出　　处：《云南地质》2025年第1期71-76,共6页Yunnan Geology

摘　　要：长湾金矿床具微细粒金矿特征,严格受构造及不整合面控制,峨眉山玄武岩组与喜山期高钾富碱复式斑岩体为矿床金矿化赋矿岩石单元。载金铁矿物主要以吸附态赋存于矿物表面,矿床初始矿源层受多期次热液蚀变交代作用,形成含金银黄铁矿等多金属硫化物,在表生期遭受长期地表水-地下水循环系统酸性氧化淋滤作用使黄铁矿氧化成褐铁矿保留在破碎带中。初步认为属火山及次火山-热液金银矿矿床。The Changwan gold deposit shows characteristics of micro-finegrained gold deposit and is strictly controlled by structures and unconformity planes.The Emeishan Basalt Formation and Himalayan high-potassium and alkali-rich composite porphyry are ore-bearing rock units.Gold mainly exists in an adsorbed state on mineral surfaces.The initial oresource layer has undergone multi-stage hydrothermal alteration and metasomatism,forming sulfides like pyrite containing Au and Ag,and was then oxidized to limonite by acidic oxidative leaching and retained in the fracture zone.The deposit is preliminarily considered to be a volcanic and sub-volcanic hydrothermal Au-Ag deposit.

关 键 词：海相喷发火山岩 热液 地质特征 矿床成因 长湾金矿 云南宁蒗 

分 类 号：P618.51[天文地球—矿床学]