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平顺地区矽卡岩型铁矿位于太行山南段山西省境内,主要产于燕山期中性侵入岩与中奥陶统碳酸盐岩地层接触带及其附近。不同类型铁矿石与平顺岩体的微量元素、稀土元素组成特征表明,矿体与岩体具有一定的继承性,说明二者成因关系密切。矿石S同位素(δ34S=12.5‰~17.4‰,平均值为15.0‰)显示具有地壳硫的特征;Pb同位素(206Pb/204Pb=17.365~19.032,平均值为18.121;207Pb/204Pb=15.417~15.689,平均值为15.543;208Pb/204Pb=37.433~39.762,平均值为38.379;μ=9.21~9.28,ω=34.6~39.33,)显示铀铅富集,钍铅亏损的特征。平顺铁矿石微量元素、稀土元素、S、Pb同位素组成特征表明,较早期闪长岩是主要的成矿母岩,但晚期辉长岩可能通过交代作用,间接提供了物质来源和热源。在成矿过程分析的基础上,建立了本区矽卡岩型铁矿床的成矿模式。
The skarn-type iron ore in the Pingshun area is located in the Shanxi section of the southern section of the Taihang Mountains and occurs mainly in and near the contact zone between the Neo-Middle Ordovician carbonate rocks and the Yanshanian neutral intrusive rocks. The characteristics of trace elements and rare earth elements in different types of iron ore and smooth rock indicate that the ore body and rock mass have a certain succession, indicating that the two are closely related to each other. The S isotopes of ore (δ34S = 12.5 ‰ ~ 17.4 ‰, with an average value of 15.0 ‰) show crustal sulfur. Pb isotopes (206Pb / 204Pb = 17.365 ~ 19.032, mean = 18.121; 207Pb / 204Pb = 15.417 ~ 15.689, 208Pb / 204Pb = 37.433-39.762, with an average of 38.379; μ = 9.21-9.28 and ω = 34.6-39.33), indicating the enrichment of uranium and lead and the loss of thorium and lead. The trace element, rare earth element, S, Pb isotopic compositions of Pingshun iron ore indicate that the earlier diorite is the main metallogenic rock, but the late gabbro may indirectly provide the material source and heat source through metasomatism. Based on the analysis of metallogenic process, the metallogenic model of skarn type iron deposit in this area was established.