试论宁镇地区热液型矿床特征及形成机理

On the Characteristics and Mechanisms of Hydrothermal Metallic Deposit in Ning-Zhen Area

近年来在形容宁镇地区内生矿产成矿规律时,经对一些矿床、矿点野外地表、坑道地质、钻孔岩矿心观察,发现在部分铁、铜、钼、硫、多金属矿体及绝大多数各类矽卡岩,它们各自与围岩接触界线清楚,为穿插关系,

Abstract: It has been found that many of Fe, Cu, S, Mo and polymetalic deposits and most of skarn appear vein like with clear contact line to the host rock during the research on the mineralization law of endogenetic mineral deposit in Ning-Zhen area. Above mentioned deposits shoule be post-magmatic hydrothermat filling in the fault fissures of which the thermal the hydrothermal fluid comes from post-magmatic ore-bearing gas-water fluid and ground water, which extract the ore-forming elements beard in the rock and strata and accumulate them in the deep thermal fluid reservoir. Due to geological variation, it produces dissipation structure and upward ingressed differentiated and in pulse, and produce simple magnetic oxides, silicates, sulfides, sulphates, carbonates early or late. The results of skarn, porphyry, inner explosive breccia strata-bond type deposits are only resulted from the different position of hydrothermal precipitation. From first stage to the 5th stage, the paper says on the composition of hydrothermal fluid, the radius of mono-valention increases, bivalent Or more valention such as Fe, Mg, Ca reduces, mineral elements evoluted in the sequence of Fe-S, Cu (Au), Mo, Pb, Zn-Pb, Zn, Au, Ag, and temperature, pressure and salinity decreases. S associated with Cu, Mo, Pb, Zn mainly come from mantle. Fe, Cu, Mo, Zn, Au mainly come from magmatic rock itself. Pb is related to mantle origin but more related to the Precambrian strata.