【摘要】 徐家山沉积-改造型层控锑矿床产于较老海相碳酸盐岩地层中。矿石中含有硒,它以类质同象形式替代辉锑矿晶格中硫的位置。 根据矿物包裹体特征和硫、氧、碳氢稳定同位素组成探讨本矿床的矿质来源与矿液性质问题。更多还原

【Abstract】 The Xujiashan sedimentary-reworked strata-bound Sb deposit occurs in marine carbonate rocks of the Upper Sinian. The mineralization is controlled by the strata and structures. Stratoid, lenticular, and vein ore bodies are commonly observed.δ34S values for sulfide and sulfate minerals from this deposit are within the range of + 12.1 to + 23.3‰. All stibnites have positive δ34S values. Similarly, barites also have relatively large positive δ34S values and they are like the stibnites, both being enriched in heavy sulfur isotopes. δ34S∑S = +13.6‰ for ore fluids. The G and O isotopic compositions of calcite in the ores are uniform and stable, with δ18O values ranging from +9.1 to 11.6 and δ13C values from -2.6 to - 0.3‰. δ13C∑c=0‰ for ore fluids.On the basis of the above data, the author has come to the conclusion that S and C in this deposit were derived from the marine facies source. The calculated δ18OH2o values for ore-forming solutions indicate an equilibrium at 200± 15‰. δ18On2o values range from - 1.6 to +1.1‰ for calcite and - 0.1 to +1.7‰ for quartz, both being much lower than δ18O values for juvenile and regionally metamorphic waters. Thus, it may be concluded that the ore-forming solutions came from underground waters.On the basis of the data from the composition of the fluid inclusions, the ore-forming solution may be a subacidic to subalkalic solution of salt water with lower temperature and higher salinity.更多还原