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马庄山大型金矿位于阿齐克库都克东部 ,分布有中晚石炭世的中酸性火山岩及相应的次火山岩。近 2 0条矿体产于其中。矿石平均品位为 6.4× 1 0 -6。成矿流体均一温度的峰值在 2 4 0～ 2 60℃ ,成矿深度为 1 .6～ 2 .3km,具有浅成成矿的特点。成矿流体成分摩尔浓度比值 m K+m N a+ (0 .1 0～ 0 .81 )、m2N a+ m Ca2 + (0 .0 0 1～ 0 .338)、 mΣCl mΣS和 mΣC mΣS等比值 ,成矿条件参数p H值为 5.8～ 7.4,氧逸度 (f O2 ) 1 .9× 1 0 -5 5～ 2 .9× 1 0 -47Pa,硫逸度 (f S2 )约为 1 0 -1 3 Pa;Eh值为 - 0 .6e V流体 δ3 4 S值为 +3.94‰～ +4.98‰ ,均随还原参数 Hy[Hy=(CO+CH4) / CO2 ]和温度有规律变化。且矿石和脉石中的金含量也与 Hy成正比。矿石和脉石 REE配分图和微量元素特征与岩浆岩相似 ,代表着成矿物质来源与围岩岩浆岩关系密切。推断岩浆来源的成矿流体经地下水的混合作用是金沉淀的重要机制。
Mazhuangshan large gold deposit is located in eastern Aztukuduke, distribution of the Middle-Late Carboniferous acidic volcanic rocks and the corresponding sub-volcanic rocks. Nearly 20 ore bodies are produced in it. The average ore grade is 6.4 × 10 -6. The homogenization temperature of ore-forming fluid has a peak at 240 ~ 260 ℃ with a mineralization depth of 1.6 ~ 2.3km, which is characterized by shallow mineralization. The ratios of molar concentrations of ore-forming fluids m K + m N a + (0 .1 0 ~ 0 .81), m2N a + m Ca2 + (0 0 1 ~ 0 .338), mΣCl mΣS and mΣC mΣS The p H value of the ore condition parameter is 5.8 to 7.4, the oxygen fugacity (f O2) is 1.9 × 10 -5 -5 ~ 2.9 × 10 -47 Pa, and the sulfur fugacity (f S2) is about 1 0 -1 3 Pa, and the δ3 4 S value of Eh value -0.6eV was + 3.94 ‰ ~ + 4.98 ‰, both with the change of Hy [Hy = (CO + CH4) / CO2] and temperature. And the ore and gangue gold content is also proportional to Hy. Ore and gangue REE distribution maps and trace element characteristics similar to the magmatic rocks, representing the source of ore-forming materials and rock magmatic rocks are closely related. It is concluded that the mixing of magma-derived ore-forming fluids with groundwater is an important mechanism of gold precipitation.