摘要
长阳复背斜位于湘西—鄂西成矿带中北部,铅锌矿主要赋存层位为震旦系灯影组白马沱段中上部。研究该区内铅锌矿流体包裹体特征,此包裹体由单相盐水溶液包裹体(LH_2O)和两相盐水溶液包裹体(LH_2O+VH_2O)组成,属于NaCl-H_2O体系,其均一温度有三个区间,即110~150℃,160~185℃,230~285℃,冰点温度为-2.8^-8.2℃,盐度为4.5~12.0 wt%NaCl,所代表成矿流体密度为1.015~0.794g/cm^3。通过铅锌矿石C、O同位素测定,区内铅锌矿石中C、O同位素组成较为稳定,C、O同位素变化范围较窄,投影点主要分布在沉积碳酸盐的范围内,反映了成矿流体与围岩的密切联系。
Changyang anticlinorium is located in the north and middle region of western Hunan-western Hubei metallogenic belt,the main occurrence horizon of lead-zinc mine is in the mid-upper Baimatuo Section of Dengying Formation of Sinian.The authors studied the characteristics of fluid inclusions in lead-zinc deposit,which composed by single-phase saline solution（LH_2O） and two-phase inclusions（LH_2O＋VH_2O） saline solution,belonging to Na Cl-H_2O system.There are three intervals of the homogenization temperature,namely 110 ~ 150 ℃,160 ~ 185 ℃ and 230 ~ 285 ℃;the ice point temperature is -2.8 ^-8.2 ℃,salinity is 4.5 ~ 12.0 wt% Na Cl,representing the ore-forming fluid density is 1.015~0.794 g/cm^3.By the C and O isotope determination in the lead-zine ore,their compositions are relatively stable,and the variation range of C and O isotope is relatively narrow.subpoints are mainly distributed in the area of carbonate sedimentary,reflecting the ore-forming fluid is closely related to the surrounding rock.
出处
《资源环境与工程》
2017年第3期266-271,共6页
Resources Environment & Engineering
基金
中国地质调查局工作项目
湖北长阳曾家墩地区铅锌矿远景调查(1212011085347)
