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中文摘要：
北洺河铁矿是太行山南段邯邢地区主要铁矿床之一,属于二长闪长岩侵入中奥陶统石灰岩形成的典型矽卡岩型铁矿床。针对北洺河矿区矽卡岩和磁铁矿矿石进行了S、Pb同位素分析研究,并结合前人对岩体S、Pb同位素分析结果进行了成矿物质来源探讨。结果表明,北洺河铁矿成矿物质来源复杂,其中硫同位素δ34 S变化范围为12.2‰～16.5‰,明显偏离陨石硫范围,说明成矿物质来源与成矿围岩有关。特别是深部成矿流体在自下而上运移过程中,受围岩石灰岩地层中膏盐层的混染,体现出混合硫来源特点。铅同位素组成中,206Pb/204Pb=17.840～18.793,平均值为18.419;207Pb/204Pb=15.46～15.62,平均值为15.56;208Pb/204 Pb=37.927～39.301,平均值为38.730,表明铅的来源以下地壳铅源为主,兼混有少量幔源铅。
英文摘要：
The Beiming River iron deposits as one of major typical skarn-type deposits are located in Hanxing area,southern Taihang Mountains.It was formed in the boundary between diorite intrusion and mid-Ordovician limestone.This paper analyzed the isotopic data of sulfur and lead for skarn and magnet ore of the deposits and discussed in further the ore source by comparison with existed isotopes data.From all of these,it is demonstrated that the iron deposits had multi-sources and the sulfur isotopes provided an evidence of mixed origins with ratio ranging from 12.2‰ to 16.5‰.Isotopic ratios for sulfur are influenced by the ore-forming processes and environment,and the ratio range indicated that the gypsum strata in wall rock was also involved in the mineralization during the movement of the deeply derived metallogenetic fluid from the lower to the upper.In addition,the 206Pb/204Pb,207Pb/204Pb and 208Pb/204Pb ratios of pyrite are in the ranges of 17.840-18.793（mean value is 18.419）,15.46-15.62（mean value is 15.56） and 37.927-39.301（mean value is 38.730）,respectively,which show that lead mainly originated from lower crust and mixed with a few from the mantle.
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