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对大厂矿田进行详细地质调查并对铜坑和大幅楼矿床进行系统观察与研究,结果表明:长坡矿床主要由裂隙脉型、细脉型、似层状、细脉-网脉浸染状等矿化类型组成。裂隙脉型矿化在垂向上通常呈透镜状,细脉型矿化具有稳定的走向与倾向,似层状矿化一般沿地层中的断裂系统充填和交代变化;巴力-龙头山矿床矿物组分复杂、种类繁多。矿石结构以他形-半自形以及细粒为主,其次为填隙结构、固溶体分离结构、溶蚀结构、反应边结构以及压碎结构等;矿石构造包括块状、细脉状、浸染状、条带状、晶洞状、生物残余和角砾状等构造。同时,对金属硫化物的硫同位素进行分析,结果表明:铜坑矿床的硫同位素δ34S值较分散,介于-0.30%~1.38%之间;而大福楼矿床硫同位素δ34S值较集中,变化范围为-0.15%~0.22%,说明不同矿床的硫同位素组成存在较大的差异。大福楼矿床相对铜坑矿床而言,硫同位素组成具有更为集中的特点。同样,不同类型金属矿物的硫同位素组成也不同,磁黄铁矿的硫同位素较为分散,而黄铁矿的硫同位素组成更为均一。总体来看,硫同位素组成的差异既体现在矿床尺度上也表现于不同类型的矿物上,这可能受到矿床不同的硫来源影响。
The detailed geological survey of Dachang orefield and the systematic observation and research on the copper pit and the large-scale deposit have been carried out. The results show that the Changpo deposit is mainly composed of fissure vein pattern, fine vein pattern, laminar vein, veinlet vein network disseminated Mineralization type composition. Fissure-vein mineralization is usually lenticular in vertical direction. Vein mineralization has a stable trend and tendency, and stratiform mineralization generally fills and alternates along the fault system in the strata. The mineral assemblages of the Baal-Longtoushan ore deposit Sub-complex, a wide range. The ore structure mainly consists of heform-semicircle and fine grain, followed by interstitial structure, solid solution separation structure, dissolution structure, reaction edge structure and crushed structure. The ore structure includes block, veinlet, disseminated, Banded, cave-shaped, biological remnants and breccias and other structures. At the same time, the sulfur isotopes of metal sulphides are analyzed. The results show that the δ34S value of Tongkeng deposit is more dispersed, ranging from -0.30% to 1.38%; while the δ34S value of sulfur isotopes in Taifulou deposit is more concentrated, Is -0.15% -0.22%, indicating that there is a big difference in sulfur isotopic compositions of different ore deposits. The Taifulou deposit has a more concentrated sulfur isotopic composition than the Tongkeng deposit. Similarly, different types of metal minerals have different sulfur isotopic composition, sulfur isotopes of pyrrhotite are more dispersed, and sulfur isotopic compositions of pyrite are more uniform. Overall, the differences in sulfur isotopic composition are manifested both in the size of the deposit and in different types of minerals, which may be affected by different sulfur sources in the deposit.