摘要
云南老寨湾金矿属于微细粒浸染型金矿床,金矿化类型主要有硅化褐铁矿化石英砂岩、毒砂黄铁矿化硅化石英砂岩、粘土化弱褐铁矿化石英砂岩和毒砂黄铁矿化粘土化辉绿岩4种。金多以独立矿物形式出现,少量呈分散状。矿石中金矿物以自然金为主,其次为自然银。金矿物以类质同像、包裹金、裂隙金和粒间金等形式赋存于毒砂、黄铁矿、辉锑矿和有机物(胶体)等主要载金矿物中。金矿物形态各异,粒度多<1μm,属于超显微粒级金。金矿物特征反映出本区金矿床的成矿物质主要来源于岩浆岩,成矿作用与华力西—印支期蚀变辉绿岩有关,这与矿区以往研究所确定的矿床成因认识相一致。
Laozhaiwan gold deposit is a micro-fine grain gold deposit of the sedimentry with the major gold mineralizated in four altered types which include silicification of the quartz sandstone,silicon arsenopyrite pyrite silicon-quartz sandstone,quartz sandstone and clay weak limonite-arsenopyrite clay diabase.The gold often occurred as independent gold mineral,while a few gold occurred in depersing state.Native gold is the main gold in ores,and natural silver is the the second.Gold minerals oceur in the gold arsenopyrite,pyrite,stibnite and organie matter（col- loids）and other major gold minerals in form of isomorphic,wrapped gold,gold and intergranular cracks.Gold mineral form are various,with particle size less than 1μm,belonging to ultra particulate gold.Gold mineral characteristic reflecting the gold deposit forming materials mainly come from igneous rocks in this area,mineralization and Hualixi-Indo alteration of diabase-related.This consistent with the understanding about the mine formation in the past studies.
出处
《黄金科学技术》
2011年第6期40-43,共4页
Gold Science and Technology
关键词
金矿床
矿物特征
赋存状态
老寨湾金矿
云南省
Gold deposit
Mineral characteristics
Oeeurrence
Laozhaiwan gold deposit
Yunnan Province
