辽西蒋家屯和兰家沟钼矿的流体包裹体对比研究  

Comparative Study on the Fluid Inclusion in Jiangjiatun and Lanjiagou Mo Deposits in the Liaoxi Area

作　　者：李明[1] 王国光[2] 张永利[1] 巩恩普[1] LI Ming;WANG Guo-guang;ZHANG Yong-li;GONG En-pu(School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China;School of Earth Sciences and Engineering,Nanjing University,Nanjing 210023,China)

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819 [2]南京大学地球科学与工程学院,江苏南京210023

出　　处：《东北大学学报（自然科学版）》2021年第6期835-841,共7页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(41972002)。

摘　　要：通过对辽西蒋家屯和兰家沟钼矿的流体包裹体研究,两种不同类型的成矿流体被识别出来.蒋家屯脉状钼矿含矿石英脉中发现大量的Ⅰ型水溶液流体包裹体,成矿流体的均一温度为163~234℃,盐度为3.06%~6.01%(NaCl eqv,质量分数),表明成矿流体为中低温度、低盐度流体.兰家沟斑岩型钼矿含矿石英脉中发育含CO 2Ⅱ型包裹体,包裹体内较高含量的CO 2指示了成矿深度较大.兰家沟钼矿的成矿流体均一温度为200~283℃(Ⅰ型包裹体)和281~346℃(Ⅱ型包裹体),盐度为2.74%~7.31%(NaCl eqv,质量分数)(Ⅰ型包裹体)和3.52%~4.80%(NaCl eqv,质量分数)(Ⅱ型包裹体).鉴于上述研究,与大型兰家沟斑岩型钼矿相比,目前揭露的蒋家屯脉状钼矿体成矿深度较小,成矿温度较低,其深部可能会发现更具经济价值的斑岩型钼矿体.Based on the fluid inclusion study on the Jiangjiatun and Lanjiagou Mo deposits,two distinctive ore-forming fluids were identified.Fluid inclusions in the Jiangjiatun Mo deposit are characterized by typeⅠtwo-phase aqueous inclusions,with homogenization temperatures from 163 to 234℃and salinity values from 3.06%to 6.01%.It indicates that ore-forming fluids are moderate-low homogenization temperature and salinity.Fluid inclusions in the Lanjiagou Mo deposit are featured by typeⅡCO 2-bearing fluid inclusions,indicating a deep formation environment.Microthermometric data in the Lanjiagou Mo deposit show homogenization temperatures from 200 to 283℃for typeⅠinclusions and from 281 to 346℃for typeⅡinclusions,and salinities from 2.74%to 7.31%for typeⅠinclusions and from 3.52%to 4.80%for typeⅡinclusions.In view of the above research results,it is believed that the discovered ore bodies in the Jiangjiatun deposit were formed in a much shallower environment with lower homogenization temperature and salinity than the Lanjiagou Mo deposit.It indicates that it is possible to find Mo orebodies at depth beneath the exposed ore bodies.

关 键 词：流体包裹体 钼矿 蒋家屯 兰家沟 辽西 

分 类 号：P611.1[天文地球—矿床学]