摘要
通过对峨山花岗岩体及矿化岩体石英斑晶中流体包裹体特征对比研究,结果表明:从早期至晚期阶段均一温度有升高再降低、盐度总体有降低趋势,中期驴子村单元盐度出现7%~8.5%、10%~11.5%两个区域,高盐度液相是搬运金属Cu、Mo等的主要载体。采用流体包裹体联合H_2O饱和花岗岩固相线估算压力,含钨、铜花岗岩最小侵位深度均约10km。拉曼特征表明,流体包裹体含H_2O、CO-3、CO_2、SO_2、CH_4物质,说明流体具有搬运W、Mo等金属元素的能力,认为具有形成斑岩型钨钼铜矿床的成矿潜力。由于剥蚀深度大于4.8km,保存Cu、Pb-Zn的条件不佳,寻找浅层低温岩浆热液型铜、铅锌应着眼于驴子村单元花岗岩的侧翼。
A comparative analysis was used to discuss fluid inclusions in quartz phenocryst from granites and ore bearing granites fluid.The result of the study showed that,from early to late stage,the homogenization temperature were increase and then decrease,salinity were generally decrease,the salinity in the mid-term Lüzicun unit had two concentrated regions：7%to 8.5%,10%to 11.5%,and the high salinity liquid phase was the main carrier of metal Cu and Mo.The geological conditions of the fluid from tungsten and copper bearing granite are similar to that of late Mokela granite with minimum exsolution depth is about 10 km by the method of fluid inclusion together with water-saturated solidus.Laser-Raman characteristics of inclusions showed that fluid inclusions contain substances such as H2O、CO-3、CO2、SO2、CH4,which indicated that the fluid has the ability to transport metal elements such as W and Mo.It is considered that the area might have the metallogenic potential of forming porphyry tungsten molybdenum copper deposits.When the denudation depth is more than 4.8 km,the conditions for the preservation of Cu and Pb-Zn are not good.While prospecting shallow low-temperature magmatic hydrothermal type copper and lead-zinc,we should focus on the flanking of the granite plutons in the mid-term of Lüzicun unit.
作者
胡金
张世涛
杨昌华
郑绍刚
HU Jin;ZHANG Shitao;YANG Changhua;ZHENG Shaogang(Faculty of Land Resource Engineering of Kunming University of Science and Technology,Kunming 650031,Yunnan,China;No.313 Geological Team of Yunnan Nonferrous Metals Geological Bureau,Yuxi 653100,Yunnan,China)
出处
《矿产与地质》
2018年第3期493-500,共8页
Mineral Resources and Geology
基金
云南省地质勘查基金项目"云南省峨山县驴子箐铅锌多金属矿普查(项目编码:K2013002)资助
关键词
花岗岩
矿化岩体
流体包裹体
石英斑晶
峨山
granite
mineralized rock mass
fluid inclusions
quartz speckles
Eshan
