现代地质2025，Vol.39Issue(3)：681-695,15.DOI:10.19657/j.geoscience.1000-8527.2024.114
云南普朗铜矿含矿石英流体包裹体特征及对成矿作用的指示
Characteristics of Quartz Fluid Inclusions Containing Ore and Its Mineralization Indications in the Pulang Copper Deposit,Yunnan,China
摘要
Abstract
The Pulang copper deposit is located in the eastern part of Diqing Tibetan Autonomous Prefecture in northwest Yunnan.It occurs in the Late Triassic quartz diorite porphyry quartz diorite porphyry granite diorite porphyry complex.Due to the extremely weak research on the ore-bearing fluids in the northern mining section of the first mining area of the Pulang porphyry copper deposit,the understanding of the ore-forming system has been restricted.This article conducts petrographic observations,uniform temperature tests,and laser Raman probe composition analysis on fluid inclusions of ore bearing quartz fluids in the northern part(line 20-44)of the first mining area of the mining area.The results show that the ore bearing quartz veins in the northern part of the first mining area of the Pulang copper deposit are widely developed with gas-liquid two-phase inclusions and three-phase inclusions containing daughter crystals.The types of daughter crystals mainly include rock salt,po-tassium salt,calcite,chalcopyrite,etc.Fluid inclusions have two types:high salinity and medium low salinity.The uniform temperature range of high salinity fluid inclusions is 243-418 ℃,with an average of 338 ℃,a uniform pressure range of 1008-1552 MPa,and an average of 1178 MPa;The salinity is 30.1％-49.7％,with an average of 36.6％;The density ranges is 0.89-1.16 g/cm3,with an average of 1.02 g/cm3;The uni-form temperature range of medium low salinity is 317-438 ℃,with an average of 392 ℃;The uniform pres-sure range is 370-559 MPa,with an average of 464 MPa.The salinity is 5.7％-13.0％,with an average of 9.3％;The density ranges is 0.55-0.77 g/cm3,with an average of 0.66 g/cm3.Based on analysis,it is be-lieved that the ore-forming fluid in the northern part of the first mining area of the Pulang Copper Mine did not experience significant boiling,indicating that the area is not the ore-forming center.The laser Raman spectros-copy show that the gas phase composition of the inclusion contains CH4,H2O,and SO2,indicating that the early ore-forming fluids may have been in a reducing environment.The decrease in temperature and pressure of high salinity medium density fluids,as well as the mixing effect of magmatic fluids,jointly led to the formation of vein like and disseminated mineralization in the northern area of the first mining area of the Pulang copper mine.关键词
斑岩型铜矿/石英/流体包裹体/成矿流体/普朗/滇西北Key words
porphyry copper deposit/quartz/fluid inclusion/ore-forming fluid/Pulang/nothwestern Yunnan分类
天文与地球科学引用本文复制引用
沙有财,舒华伟,董桥峰,唐思宇,胡明川,尹俊,蹇龙,李莹,李静婷..云南普朗铜矿含矿石英流体包裹体特征及对成矿作用的指示[J].现代地质,2025,39(3):681-695,15.基金项目
云南迪庆有色金属有限责任公司重点科技创新项目(DQYS202206). （DQYS202206）
