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该实验研究了富家坞斑岩铜矿床主要金属硫化物组合黄铁矿——黄铜矿在 H_2O,KCl—H_2O 和 NaCl—KCI 体系中的溶解度以及不同的硷度,不同浓度的 NaCl 溶液对矿物溶解度的影响。实验结果得出以下主要几点认识1、影响铁、铜元素溶解,运转和沉淀富集的主要因素是、温度,介质溶液浓度及其酸硷度铁、铜元素在热液条件下的溶解和运移的有利条件是温度〉350℃,高盐度和低PH 值,压力无明显关系。2、黄铁矿、黄铜矿在水中的溶解度很低,但在硷金属氯化物热液中的溶解度大大增加,说明溶解度的增大与 Cl~-密切相关,为此认为富家坞一类斑岩铜矿床中成矿金属(Fe、Cu)在热液条件下主要成氯络合物形式进行搬运。3、在热液条件下,NaCl-H_2O 溶液对Fe、Cu元素的溶解,运移以及沉淀成矿都比 KCl-H_2O 溶液有利。4、温度的降低,PH 值的升高,是促使 Fe、Cu 的氯络合物和 H_2S 在热液中离解的主要因素,从而使成矿溶解中的Cu~(2+)、Fe~(3+).s~(2-)等离子浓度远远超过饱和浓度,因而发生铁,铜硫化物的大量沉淀富集。
The experiment studied the solubility and the different alkalinity of the main metal sulfide pyrite-chalcopyrite in H_2O, KCl-H_2O and NaCl-KCI systems in the Fujiatang porphyry copper deposit. The different concentrations of NaCl solution Effect of mineral solubility. The main results obtained in the experiment are as follows: 1. The main factors that affect the dissolution and operation of iron and copper and the enrichment of precipitation are that the temperature, the concentration of the medium solution and the acidity of iron and copper in the hydrothermal solution and The favorable conditions for migration are temperature> 350 ℃, high salinity and low PH value, no significant relationship between pressure. 2, pyrite, chalcopyrite solubility in water is very low, but the solubility in alkali metal chloride hydrothermal greatly increased, indicating that the increase in solubility and Cl ~ - is closely related to this view that a class of Fu Jia dock The metallogenic metals (Fe, Cu) in the rock-copper deposit are mainly transported in the form of chloro-complexes under hydrothermal conditions. Under the conditions of hydrothermal solution, the dissolution and migration of Fe and Cu elements in NaCl-H 2 O solution are more favorable than the KCl-H 2 O solution. (4) The decrease of temperature and the increase of pH value are the main factors that lead to the dissociation of chlorine complexes of Fe and Cu and H_2S in hydrothermal solution, which leads to the formation of Cu 2 +, Fe ~ 3 +) .S ~ (2-) plasma concentration far exceeds the saturation concentration, resulting in a large number of iron and copper sulfide precipitation enrichment.