南秦岭晚古生代凤县—太白盆地是在扬子地台北缘早古生代被动大陆边缘发展起来的具裂陷性质的盆地,处在秦岭微板块当中,在盆地内既产有八卦庙超大型金矿也产有八方山—二里河大型铅锌矿床,是铅锌与金矿床共生/共存的一个典型地区。两种矿床在地质背景、产出层位和成矿特征等方面具有某些关联,铅锌矿层产在中泥盆统古道岭组灰岩与上泥盆统星红铺组变泥质岩过渡层位的铁白云石—钠长石—硅质热水沉积岩系中,金矿体位于上泥盆统星红铺组底部,由含石英细脉多期变形的蚀变钠长石、铁白云石粉砂岩等热水沉积岩系构成。硅同位素组成反映金矿床中存在两类不同来源的硅,一类是钠长石岩和顺层石英细脉的硅同位素组成(δ30Si=-0.40‰～-0.32‰),与铅锌含矿层中硅质岩的硅同位素组成相似,硅质与热水沉积作用相关,另一类是金矿体中的穿层石英脉,其硅同位素反映硅来自晚期岩浆流体;铅锌矿床硫化物中硫同位素(δ34S=6.03‰～16.88‰)反映硫主要来自海底热水沉积,形成于盆地早期开放体系;金矿石中硫化物硫同位素组成(δ34S=4.10‰～15.40‰)反映硫主要为地层硫,形成于盆地晚期半封闭—封闭体系;铅同位素组成反映盆地内由西坝岩体泥盆系地层铅锌矿石金矿石铅同位素演化有幔源成分减少,壳源成分增加的趋势;氢、氧同位素数据揭示出铅锌矿成矿流体中的水来自于大气降水,金矿则具多源性,包括岩浆水、大气降水和变质水。研究认为泥盆纪海底热水沉积作用形成了铅锌矿层的主体,也使金(银、铜)在热水沉积岩系中明显富集,而中生代造山过程中的构造—流体作用使金矿体定位。金与铅锌的共生/共存关系,受控于这种成矿地质过程及流体化学、物理化学演化。金与铅锌的这种时空关系可作为已知矿床深部勘查和外围找矿的依据。 The Late Paleozoic Fengxian-Taibai basin of the South Qinling is a basin of rifted nature developed on the margin of the Early Paleozoic passive continental margin in the northern margin of the Yangtze Platform. It is located in the Qinlingling Microfacies. In the basin, both the Bagua Temple super-large gold mine Produced a Bafang Mountain - Erlian large lead-zinc deposits, lead-zinc and gold deposits symbiosis / coexistence of a typical area. There are some correlations between the two types of ore deposits in terms of geological background, output stratigraphy and metallogenic characteristics. Lead-zinc deposits are produced in the transitional period between the Upper Daodeling Formation limestone in the Middle Devonian and the Xinghuopu Formation argillaceous in the Upper Devonian In the stratigraphic iron-dolomite-albite-siliceous hydrothermal sedimentary rock series, the gold ore body is located at the bottom of the Upper Devonian Xinghongpu Formation and is composed of altered albite, quartzite with multiple deformations, Rock siltstone and other hydrothermal sedimentary rock formation. The silicon isotope composition reflects that there are two types of silicon in the gold deposit, one is the silicon isotope composition (δ30Si = -0.40 ‰ -0.32 ‰) of albite and bedding quartz veins, which is similar to the silicon The silicon isotope composition of the plagioclase is similar, the siliceous is related to the deposition of hydrothermal water, and the other is the stratigraphic quartz vein in the gold orebody. The silicon isotope reflects that the silicon comes from the late magmatic fluid. The sulfur isotopes δ34S = 6.03 ‰ ~ 16.88 ‰), reflecting that the sulfur mainly came from the seafloor hydrothermal deposits and formed in the early open system in the basin. The sulfide sulfur isotopic composition (δ34S = 4.10 ‰ ~ 15.40 ‰) in gold ores reflects that sulfur is mainly formed by sulfur Pb isotope compositions reflect the decrease of mantle component and lead in the lead-zinc ore gold deposits in the Devonian strata of the Xiba block, and the increase of the crust source composition. The hydrogen and oxygen isotope data reveal The water in the lead-zinc ore-forming fluid is derived from atmospheric precipitation, while the gold deposits are multi-sourced, including magmatic water, atmospheric precipitation and metamorphic water. The study suggests that the submarine hydrothermal sedimentation of the Devonian formed the main body of lead-zinc deposits and also caused the enrichment of gold (silver, copper) in the hydrothermal sedimentary rock series. The tectono-fluid interaction during the Mesozoic orogenic processes made the gold ore body Positioning. The symbiosis / coexistence of gold with lead-zinc is governed by this metallogenic geological process and fluid chemistry and physico-chemical evolution. This space-time relationship between gold and lead-zinc can serve as a basis for deep exploration of known deposits and prospecting for the periphery.