摘要
通过对滇西澜沧老厂矿区1480 m中段2号硐室主巷和CM9穿脉典型蚀变剖面野外编录和室内岩矿鉴定,矿区深部与隐伏花岗斑岩岩浆作用有关的热液蚀变可划分为黄铁绢英岩化带、黄铜矿化硅灰石-透辉石-石榴子石矽卡岩化带、黄铁矿化透辉石矽卡岩化带、含钙铝榴石黄铁矿绢云母绿泥石青磐岩化带和大理岩化带。其中,硅灰石-透辉石-石榴子石矽卡岩是深部矽卡岩型铜(钼)矿最主要的含矿地质体,而铅锌矿化呈脉状主要赋存于含钙铝榴石黄铁矿绢云母绿泥石青磐岩旁侧大理岩裂隙,岩体中心往外,矽卡岩颜色由红棕色过渡为灰绿色,该研究将对后期深部隐伏花岗斑岩体(脉)的预测及寻找与斑岩有关的矿床提供了找矿思路与方向。
Based on the field record and indoor rock and mineral identification of the typical alteration profile in main tunnel of No.2 adit and CM9 cross-vein in the 1480 m section of the Laochang mining area in West Yunnan,the authors find that the hydrothermal alteration relating to magmatism of hidden granite porphyry in the deep part is divided into four zones,i.e.pyrite sericidization,chalcopyrite wollastonite-diopside garnet skarnization,pyrite mineralization diopside skarn and calcite-bearing garnet pyrite sericite chlushite and marlinization.Among which,the chalcopyrite wollastonite-diopside garnet skarn zone is the most important ore-bearing geological body of deep skarn copper(molybdenum)deposits,the vein-like lead-zinc ore bodies are mainly occur in the fractures of the marbles beside the caldronite pyrite sericite chlorite propylite.Outside the center of the rock mass,the color of skarn changes from reddish brown to grayish green.The study conducted by the authors will provide prospecting ideas and directions for the prediction of deep hidden granite porphyry rocks(veins)and prospecting of porphyry-related deposits.
作者
吴忠如
王思学
杨玉琼
魏中林
WU Zhongru;WANG Sixue;YANG Yuqiong;WEI Zhonglin(The Five Team of Jiangxi Bureau of Nonferrous Metal Geological Survey,Jiujiang 332000,Jiangxi,China;Jiangxi Geological Engineering(Group)Company,Nanchang 330001,Jiangxi,China;College of Geoscience and Surveying Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)
出处
《矿产勘查》
2021年第5期1145-1151,共7页
Mineral Exploration
关键词
热液蚀变分带
铅锌多金属矿床
老厂
滇西澜沧
hydrothermal alteration zone
Pb-Zn polymetallic deposit
Laochang
Lancang in western Yunnan
