Fluid evolution and ore deposition in the Harz Mountains (Germany)
Fluid evolution and ore deposition in the Harz Mountains (Germany)
复制标题
哈尔茨山脉的流体演化和矿石沉积（德国）
DOI：
10.1127/ejm/4/5/1053
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发表时间：
1992
影响因子：
2.1
通讯作者：
P. Moeller
中科院分区：
文献类型：
--
作者：
V. Lueders;P. Moeller
哈尔茨山脉的石英辉锑矿、铅锌矿、钡矿和氟矿脉矿化。从晚石炭纪到晚白垩纪的漫长时间里。经济上最重要的石英硫化物矿床和随后的碳酸盐硫化物矿床是在侏罗纪沉积的。脉石英中原生两相流体包裹体的均一温度平均为120 ~ 180 ℃。方解石和萤石中的次生两相包裹体显示出大致相同的温度范围，而只有少数原生流体包裹体的均一温度在210 ~ 300 ℃之间。由于可以排除沸腾和沸腾，方解石沉淀可能是在300-200 ° C冷却时从流体中实现的，如方解石中δ 13 C与δ 18 O的正关系所示。流体包裹体中氯度的演化表明，不同来源的流体在不同的时间被排出和混合。石英硫化物矿化和碳酸盐硫化物矿化中的硫化物是由上升的含金属和碳酸盐的不含H2S的变质流体与含H2S的地层水混合而沉积的。相比之下，脉石矿物沉淀通过简单的冷却的上升流体。随后，重晶石通过一种可能类似的变质流体与来自中生代盖层残余碳酸盐岩的含SO 4 2−的下降流体的混合而沉积。最后，萤石局部沉淀从上升盐水起源于更深的来源比富碳酸盐变质流体
Quartz-stibnite, Pb-Zn, Ba-, and F-vein mineralization in the Harz Mts. over a long span of time from the Late Carboniferous to the Late Cretaceous. The economically most important quartz-sulphide and subsequent carbonate-sulphide ore deposits were deposited during the Jurassic. The homogenization temperatures of primary two-phase fluid inclusions in vein quartz lie between 120 and 180 o C on average. Secondary two-phase inclusions in calcite and fluorite show approximately the same range, whereas only few primary fluid inclusions have homogenization temperatures between 210 and 300 o C. Since boiling and effervescence can be excluded, precipitation of calcite may have been achieved from fluids when cooling from 300-200 o C as indicated by the positive δ 13 C vs. δ 18 O relationships in calcite. The evolution of chlorinity in the fluid inclusions reveals that, at different times, fluids from different sources were drained and mixed. Sulphides in the quartz-sulphide and carbonate-sulphide mineralizations were deposited by mixing of an ascending metal- and carbonate-bearing H 2 S-free metamorphic fluid with a H 2 S-bearing formation water. By contrast, the gangue minerals precipitated by simple cooling of the ascending fluid. Subsequently, barite was deposited by the mixing of a probably similar metamorphic fluid with descending SO 4 2− -bearing fluids from residual evaporites of the Mesozoic cover. Finally, fluorite locally precipitated from ascending brines originating from deeper sources than the carbonate-rich metamorphic fluid