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通过对大厂矿田大福楼矿床的岩石学、矿物学、构造地质学以及流体包裹体等方面的系统分析,解析矿床地质以及成矿流体特征。结果表明,大福楼矿区主要发育硅化、碳酸盐化、绢云母化、黄铁矿化以及磁黄铁矿化等5种围岩蚀变类型,产出有层状、穿层状以及网脉状等矿化类型。矿石结构主要为交代结构、自形半自形粒状结构、固溶体结构等,矿石构造表现为块状、浸染状、细脉状、网脉状和角砾状等,主要发育有浸染状、致密块状、细脉状和角砾状等多种矿石类型。研究显示,大福楼矿床主要存在6种流体包裹体类型,包括单相气相包裹体、单相盐水溶液包裹体、两相富蒸汽包裹体、两相富液体包裹体、三相含CO2包裹体以及富NaCl子矿物包裹体,流体形成的主体温度范围为120~150°C、230~270°C以及350~460°C。然而,成矿流体则主要形成于高温环境下,即350~460°C。成矿过程中,构造作用至关重要,通常控制着锡矿体的规模、产状以及形态。鉴别出4种热液流体类型,包括H2O NaCl CaCl2体系、H2O CaCl2体系、H2O NaCl MgCl2体系以及H2O MgCl2体系。与大厂矿田的其他矿床具有相似之处,大福楼矿床也同样具有多种成矿流体来源的特征,总体上属于壳幔联合作用的产物。
Through the systematic analysis of petrology, mineralogy, tectonic geology and fluid inclusions of Dafulou deposit in Dachang ore field, the characteristics of deposit geology and ore-forming fluids are analyzed. The results show that there are five kinds of wall rock alteration types such as silicification, carbonatation, sericitization, pyrite mineralization and pyrrhotite in Taifulil Mine, which are stratified, stratified and reticulated Like mineralization type. Ore structure is mainly confined structure, self-shaped semi-self-granular structure, solid solution structure, the ore structure showed massive, disseminated, veins, reticulate and brecciated, etc., the main development of disseminated, dense block Like, veins and breccias and other ore types. The study shows that there are mainly six types of fluid inclusions in the Taifulou deposit, including single-phase gas inclusions, single-phase brine inclusions, two-phase rich steam inclusions, two-phase rich liquid inclusions, three-phase CO2 inclusions and Rich in NaCl-rich mineral inclusions, the temperature of the fluid formed is in the range of 120-150 ° C, 230-270 ° C, and 350-460 ° C. However, the ore-forming fluid is mainly formed at high temperature, ie 350 ~ 460 ° C. During mineralization, tectonic processes are crucial and usually control the size, shape and morphology of the tin ore body. Four hydrothermal fluid types were identified, including the H2O NaCl CaCl2 system, the H2O CaCl2 system, the H2O NaCl MgCl2 system, and the H2O MgCl2 system. Similar to other deposits in Dachang orefield, the Taifulou deposit also has a variety of sources of ore-forming fluids and is generally a product of the combined action of the crust and the mantle.