| 兰坪盆地白秧坪铅锌铜银多金属矿床成矿流体及成矿物质来源 |
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| 引用本文： | 王晓虎,侯增谦,宋玉财,王光辉,张洪瑞,张翀,庄天明,王哲,张天福.兰坪盆地白秧坪铅锌铜银多金属矿床成矿流体及成矿物质来源[J].地球科学,2012,37(5):1015-1028. |
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| 作者姓名： | 王晓虎 侯增谦 宋玉财 王光辉 张洪瑞 张翀 庄天明 王哲 张天福 |
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| 作者单位： | 1.中国地质科学院地质力学研究所, 北京 100081 |
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| 基金项目： | 中国地质科学院地质力学研究所基本科研业务费项目DZLXJK201103国家自然科学基金项目U09336051国家自然科学基金项目41072071国家重点基础研究发展计划项目2009CB421001国家重点基础研究发展计划项目2009CB421008 |
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| 摘 要： | 白秧坪矿床位于滇西北兰坪盆地北部, 是一沉积岩容矿的铅锌铜银多金属矿床, 矿体赋存于中生代地层中, 受断裂构造控制明显.通过成矿期方解石、石英、闪锌矿中流体包裹体研究, 以及方解石的C、O和含硫矿物的S、Pb同位素研究, 来探讨成矿流体性质及其来源和成矿物质来源.研究表明, 白秧坪矿床包裹体一般小于10 μm, 气液两相为主, 成矿流体体系为Ca2+-Na+—K+-Mg2+-Cl--F--NO3-卤水体系, 矿床矿物中冰点温度范围为-26.4~-0.2 ℃, 平均为-14.6 ℃, 均一温度集中于120~180 ℃, 盐度为0.35%~24.73%(NaCleq), 平均值16.9%(NaCleq), 成矿流体密度在0.84~1.11 g/cm3之间, 平均值1.04 g/cm3, 成矿压力为28.0~46.9 MPa, 平均37.6 MPa, 对应的成矿深度约1 058~2 452 m, 平均1 555 m, 集中于1 200~1 800 m; 碳质的来源较为均一, 矿石中热液方解石中碳源自地层中碳酸盐岩溶解, 成矿流体属于盆地流体系统, 有大气降水的加入; 成矿物质硫来自硫酸盐的热化学还原作用, 或者含硫有机质的热分解, 金属成矿物质来自沉积地层和盆地基底.
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| 关 键 词： | 兰坪盆地 白秧坪 成矿流体 成矿物质 多金属矿床 |
| 收稿时间： | 2012-01-16 |
Baiyangping Pb-Zn-Cu-Ag Polymetallic Deposit in Lanping Basin: A Discussion on Characteristics and Source of Ore-Forming Fluids and Source of Metallogenic Materials |
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| Abstract: | Located in Mesozoic strata of northern Lanping basin, Northwest of Yunnan Province, Baiyangping deposit is a sediment-hosted Pb-Zn-Cu-Ag polymetallic deposit controlled by fracture. In this paper, a study is carried out on the fluid inclusions in ore-forming stage calcite, quartz, sphalerite and C, O isotope of calcite and S, Pb isotope of sulfur-bearing minerals, on basis of which the character and source of ore-forming fluids and the source of ore-forming materials are discussed. The fluid inclusions of Baiyangping deposit are generally less than 10 μm, main gas-liquid phase. The ore-forming fluid system was Ca2+-Na+-K+-Mg2+-Cl--F--NO3- brine system. The freezing temperature of fluid inclusions in mineral deposits ranges from -26.4 to -0.2 ℃, with an average of -14.6 ℃; the homogenization temperature is concentrated in 120-180 ℃, and the salinity varies from 0.35% to 24.73% (NaCleq), with an average of 16.9% (NaCleq). ore-forming fluid density is between 0.84 g/cm3 and 1.11 g/cm3, with an average of 1.04 g/cm3, mineralization pressure is between 28.0 MPa and 46.9 MPa, with an average of 37.6 MPa; the corresponding mineralization depths is between 1 058 m and 2 452 m, with an average of 1 555 m, concentrated in 1 200 m to 1 800 m; Carbon and oxygen isotope data indicate a homogeneous carbon source, and the carbon in hydrothermal calcite is derived from the dissolution of carbonate rock strata. The ore-forming fluid belongs to the basin brine fluid system, which is mixed with the precipitate water; S isotope data show that sulfur in sulfides and sulphosalts is derived from thermochemical sulfate reduction, or the thermal decomposition of sulfur-bearing organic matter; the metal mineralization material is from sedimentary strata and basement. |
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