摘要
洞中拉铅锌矿床是念青唐古拉山地区扎雪-亚贵拉多金属成矿带内新发现的矿床。通过对洞中拉矿床各矿化阶段石英和方解石中的流体包裹体均一温度、压力、深度、盐度、密度和流体包裹体成分等诸多方面的初步研究表明,洞中拉铅锌矿床成矿流体属中低温(106.80℃～296.70℃)、低等盐度(0.88～5.86wt%NaCleq)、中低等密度流体(0.83～0.95g/cm3)、属Cl-SO42-K+-Na+型水化学类型,成矿环境为低压(26.47～67.03MPa)浅成环境(0.96～2.44km)。流体包裹体气相成分以H2O为主,次为CO2;液相组分中,阳离子以Na+和K+为主,阴离子以SO24-和Cl-为主。流体包裹体H和O同位素,流体包裹体成分N2-Ar-He图解和离子比值研究表明,成矿流体可能主要来源于大气降水。
The Dongzhongla lead-zinc deposit is one of the newly founded deposits,which lies in the Zhaxue-Yaguila mining area, Nyainqentanglha Range, Tibet. This work has studied the homogeneous temperature, pressure, depth, salinities and compositions in quartz and calcspar in various mineraliza- tion stages of the hydrothermal ore-forming process of this deposit. The result indicates that the ore fluids belong to low and medium temperature（ 106.80- 296.70℃ ）, low sality （0.88 - 5.86wt% NaCleq）, low and medium density （ 0.83 - 0.95 g/cm^3 ） and the Cl^- -SO4^2- - K ^＋ - Na^＋ hydrochemical type. They formed at a low pressure（ 26.47 -67.03MPa） and in a shallow （0.96 - 2.44km depth ） environment. The gaseous content of the fluid inclusion is dominant by H2 O, and secondly by CO2. In the liquid phase components, Na^＋ and SO4^2- are dominant with small amount of K^＋ and Cl^-. Oxygen and hydrogen isotopes compositions, N2 -Ar-He diagram and ratio of the ion indicate that the mineralization fluids may originate primarily from atmospheric precipitation.
出处
《地质与勘探》
CAS
CSCD
北大核心
2010年第4期576-582,共7页
Geology and Exploration
基金
"十一五"国家科技支撑计划项目(2006BAB01A04)
矿物学
岩石学
矿床学国家重点(培育)学科SZD(0407)资助
关键词
流体包裹体
成矿流体
铅锌矿床
洞中拉
fluid inclusion, mineralization fluid, lead-zinc deposit, Dongzhongla
