祁漫塔格地区维宝层状矽卡岩铅锌矿矿床成因研究
发布时间：2018-10-31 09:21
【摘要】：近年来,东昆仑造山带祁漫塔格地区已成为国内最具勘探潜力的成矿远景区之一,已有近20几个矿床被陆续发现。该地区成矿事件多发生在三叠纪,成矿类型以岩浆热液系列为主,具有储量大、矿种多的特点。但由于整体研究程度较低,对已知矿床的矿床地质和矿床成因的认识还很薄弱。因此,本文通过典型矿床解剖工作,探讨了祁漫塔格地区维宝铅锌矿区的矿床成因,为区内其他岩浆热液型矿床的研究和勘探工作提供借鉴。新疆维宝铅锌矿区位于东昆仑祁漫塔格地区,由维东矿床和维西矿床两个矿床组成。两个矿床的矿化都受控于赋矿围岩的矽卡岩化蚀变,且具有相似的矿化过程。但在矿石结构构造方面存在很大的差异,其中维东矿床以块状矿石为主;维西矿床以条带状矿石为主。两个矿床的矿化过程可分为四个阶段:早矽卡岩阶段、晚矽卡岩阶段、硫化物阶段和碳酸盐阶段。在两个矿床不同阶段的石英、方解石和闪锌矿中,共有三种类型的包裹体出现:纯CO2型(PC型),CO2型(C型)和水溶液型(W型)。在维东矿床硫化物阶段以上三种类型的包裹体均有出现;而在维西矿床硫化物阶段只有水溶液型(W型)包裹体出现。维东矿床硫化物阶段C型和W型流体包裹体均一温度在263oC 424oC之间,集中于360oC 400oC,盐度在3.2 13.6wt.%Na Cl eqv.之间;维西矿床硫化物阶段水溶液包裹体均一温度在228 381oC之间,集中于280 340oC,盐度在1.6 9.0wt.%Na Cl eqv.之间;碳酸盐阶段水溶液包裹体的均一温度在115 336oC,集中于200 240oC,盐度在0.2 5.9wt.%Na Cl eqv.之间。维东矿床硫化物阶段成矿流体的δ18O和δD值分别在4.2 5.6‰和-88 -83‰之间;而维西矿床硫化物阶段成矿流体的δ18O和δD值分别在8.8 10.8‰和-99 -92‰之间;硫化物阶段的相应值在-1.0 -0.2‰和-50 -45‰之间。维宝铅锌矿区两矿床硫化物有相近的S、Pb同位素组成,其δ34S值在-2.2 3.6‰之间;硫化物的204Pb/206Pb,207Pb/206Pb和208Pb/206Pb比值分别在18.259 18.336,15.580 15.659和38.007 38.253之间。矿床地质、流体包裹体和同位素研究表明,维宝铅锌矿区维东矿床和维西矿床的成矿热液均为岩浆热液,但两矿床的成矿机制有所不同。在维东矿床流体,不混溶和流体混合是主要的成矿机制;而在维西矿床硫化物的沉淀主要由岩浆热液和不纯灰岩地层间的水岩反应引起的。我们认为,维宝铅锌矿区是一个统一的岩浆热液成矿系统,并与在区内广泛分布的三叠纪岩浆活动在时空上紧密相关。
[Abstract]:In recent years, the Qimantage area of the East Kunlun orogenic belt has become one of the most potential metallogenic scenic spots in China, and more than 20 ore deposits have been discovered one after another. The ore-forming events occurred in the Triassic and the ore-forming types are mainly magmatic hydrothermal series with the characteristics of large reserves and many kinds of minerals. However, due to the low degree of overall research, the understanding of deposit geology and genesis of known deposits is still very weak. Therefore, through the anatomical work of typical ore deposits, this paper probes into the genesis of the Weibao lead-zinc deposits in Qimantag area, which provides a reference for the study and exploration of other magmatic hydrothermal deposits in the area. Weibao lead-zinc deposit in Xinjiang is located in Qimantage area of East Kunlun Mountains and is composed of two deposits: Weidong deposit and Weixi deposit. The mineralization of the two deposits is controlled by the skarn alteration of the host rock and has a similar mineralization process. However, there are great differences in the structure of ore structure, in which the Weidong ore deposit is dominated by massive ore, and the Weixi deposit is dominated by banded ore. The mineralization process of the two deposits can be divided into four stages: early skarn stage, late skarn stage, sulfide stage and carbonate stage. There are three types of inclusions in quartz, calcite and sphalerite at different stages of the deposit: pure CO2 type (PC type), CO2 type (C type) and aqueous solution type (W type). The above three types of inclusions occurred in the sulfide stage of the Weidong deposit, but only in the aqueous solution type (W type) inclusions in the sulfide stage of the Weixi deposit. The homogenization temperature of C and W fluid inclusions in the sulfide stage of the Weidong deposit is between 263oC and 424oC, and is concentrated in 360oC 400oC and the salinity is 3.2 13.6wt.%Na Cl eqv.. The homogenization temperature of aqueous solution inclusions in the sulfide stage of the Weixi deposit is between 228m and 340oC, and the salinity is 1.6 9.0wt.%Na Cl eqv.. The homogenization temperature of aqueous solution inclusions in carbonate stage is 115 ~ 336oC, which is concentrated at 200 ~ 240oC, and the salinity is 0. 2 5.9wt.%Na Cl eqv.. Between The 未 18O and 未 D values of the ore-forming fluid in the sulfide stage of the Weidong deposit are between 4.2 ~ 5.6 鈥，
本文编号：2301648
[Abstract]:In recent years, the Qimantage area of the East Kunlun orogenic belt has become one of the most potential metallogenic scenic spots in China, and more than 20 ore deposits have been discovered one after another. The ore-forming events occurred in the Triassic and the ore-forming types are mainly magmatic hydrothermal series with the characteristics of large reserves and many kinds of minerals. However, due to the low degree of overall research, the understanding of deposit geology and genesis of known deposits is still very weak. Therefore, through the anatomical work of typical ore deposits, this paper probes into the genesis of the Weibao lead-zinc deposits in Qimantag area, which provides a reference for the study and exploration of other magmatic hydrothermal deposits in the area. Weibao lead-zinc deposit in Xinjiang is located in Qimantage area of East Kunlun Mountains and is composed of two deposits: Weidong deposit and Weixi deposit. The mineralization of the two deposits is controlled by the skarn alteration of the host rock and has a similar mineralization process. However, there are great differences in the structure of ore structure, in which the Weidong ore deposit is dominated by massive ore, and the Weixi deposit is dominated by banded ore. The mineralization process of the two deposits can be divided into four stages: early skarn stage, late skarn stage, sulfide stage and carbonate stage. There are three types of inclusions in quartz, calcite and sphalerite at different stages of the deposit: pure CO2 type (PC type), CO2 type (C type) and aqueous solution type (W type). The above three types of inclusions occurred in the sulfide stage of the Weidong deposit, but only in the aqueous solution type (W type) inclusions in the sulfide stage of the Weixi deposit. The homogenization temperature of C and W fluid inclusions in the sulfide stage of the Weidong deposit is between 263oC and 424oC, and is concentrated in 360oC 400oC and the salinity is 3.2 13.6wt.%Na Cl eqv.. The homogenization temperature of aqueous solution inclusions in the sulfide stage of the Weixi deposit is between 228m and 340oC, and the salinity is 1.6 9.0wt.%Na Cl eqv.. The homogenization temperature of aqueous solution inclusions in carbonate stage is 115 ~ 336oC, which is concentrated at 200 ~ 240oC, and the salinity is 0. 2 5.9wt.%Na Cl eqv.. Between The 未 18O and 未 D values of the ore-forming fluid in the sulfide stage of the Weidong deposit are between 4.2 ~ 5.6 鈥，
本文编号：2301648
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