赣西卡林型金矿床流体包裹体地球化学

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赣西卡林型金矿床的包裹体地球化学研究表明,金矿主成矿温度为100~200℃,平均150℃左右,成矿流体盐度为1.9wt%NaCl~8.6wt%NaCl,成矿压力为247×105Pa~608×105Pa,成矿流体属K+-Ca2+-SO2-4-(F-)-CO2型,pH为3.6~4.1,是以大气降水为主,混有建造水及少量岩浆水的混合流体。研究认为,区内金矿主要是以金硫络合物形式,在较高温度(220~300℃)体系为还原态的条件下进行迁移,温度降低为150℃左右,fs2较低,有黄铁矿及富砷黄铁矿存在时,在低压较氧化的有利构造处沉淀富集成矿。 The inclusion geochemistry of Carlin-type gold deposits in western Jiangxi shows that the main metallogenic temperature of gold mine is about 100 ~ 200 ℃ with an average of about 150 ℃. The salinity of ore-forming fluid is 1.9wt% NaCl ~ 8.6wt% NaCl, The metallogenetic pressure is 247 × 105Pa ~ 608 × 105Pa, and the ore-forming fluid is K + -Ca2 + -SO2-4- (F -) - CO2, with a pH of 3.6 ~ 4.1. There is a mixture of water and a small amount of magma water. The study suggests that the gold deposits in the area mainly migrate in the form of gold-sulfur complexes under the condition of the higher temperature (220-300 ℃) system being in the reduced state, the temperature is reduced to about 150 ℃, the fs2 is lower, and the yellow In the presence of iron ore and arsenic-rich pyrite, mineralization is precipitated at the favorable structure of low-pressure oxidation.
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