豫西栾川鱼库锌多金属矿床地质及S、Pb同位素地球化学特征
Geological Characteristics and S,Pb Isotope Geochemistry of Yuku Zincpolymetallic Deposit in Luanchuan，Western Henan

摘要： 鱼库锌多金属矿床位于豫西栾川钼钨铅锌银矿集区内的鱼库—赤土店铅锌矿带的北西端。矿床赋存于新元古界栾川群三川组碳酸盐岩夹碎屑岩地层中，矿体呈似层状、透镜状产于透辉石-石榴石矽卡岩中，受矽卡岩带控制。硫化物的硫同位素组成比较稳定，δ34S变化范围为23‰~39‰，平均32‰。硫同位素组成与区域内斑岩-矽卡岩型矿床的硫同位素组成一致，反映硫的主要来源为深部岩浆；金属硫化物样品的206Pb/204Pb变化范围为17781~18455，平均值18043； 207Pb/204Pb变化范围为15502~15590，平均值15545； 208Pb/204Pb变化范围为38232~38624，平均值38438，矿石铅同位素组成稳定，矿石铅主要来源于地幔，成矿作用与构造岩浆作用相关的热液过程关系密切。综合分析认为矿床成因应属于岩浆热液接触交代矽卡岩型矿床。
Abstract: The Yuku zincpolymetallic deposit is located in the northwest of YukuChitudian PbZn ore belt, MoWPbZnAg polymetallic concentration area in Luanchuan, western Henan.This deposit is hosted in the carbonate rocks (that interbedded with clastic rocks) from the Sanchuan Formation of Neoproterozoic Luanchuan Group. The orebody occurred in the diopsidegarnet skarn rock with stratoid and lentoid occurrence, which is strictly controlled by the skarn zone. The sulfur isotopic compositions of sulfides from this deposit are relatively stable, and the δ34S values range from 23‰ to 39‰, with an average of 32‰. The sulfur isotopic compositions are similar to the ones of porphyry-skarn type deposits in this region, indicating that these sulfurs originated from deep magma. The 206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb ratios of sulfides samples from this orebody vary in ranges of 17781-18455, 15502-15590 and 38232-38624, with the average values of 18043, 15545 and 38438 respectively. The Pb isotopic compositions of ore sulfides are also stable, and these leads are derived from mantle. For this deposit, the mineralization is closely related to the hydrothermal process of tectonic magmatism. The comprehensive analysis mentioned above indicates that Yuku deposit belongs to the skarn deposit with post magmaticepithermal metasomatic activities