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云南会泽超大型铅锌矿田由麟麒厂和矿山厂两个独立的铅锌矿床组成,方解石是两个矿床矿石中唯一的脉石矿物。本文利用方解石 Sm-Nd 等时线测定了麒麟厂6号矿体和矿山厂1号矿体的成矿时代。结果表明,会泽超大型铅锌矿田两个矿床的成矿时代一致,麒麟厂矿床为 226±15 Ma,矿山厂矿床为 225±38 Ma,如果把来自两个矿体的所有13个样品的数据作为一条等时线计算,在等时线图上仍然表现良好的线性关系,等时线年龄为222±14 Ma;结合地质、地球化学资料,认为两个矿床为同期同源成矿作用的产物。本文获得的会泽超大型铅锌矿床成矿时代与西南大面积峨眉山玄武岩成岩时代(250 Ma左右)在误差范围内接近,为“峨眉山玄武岩浆活动与铅锌成矿存在成因联系”提供了年代学证据。
Yunnan Huize ultra-large lead-zinc ore field is composed of two independent lead-zinc deposits of Linqi Factory and Mine Factory. Calcite is the only gangue mineral in the two ore deposits. In this paper, Sm-Nd isochronal calcite was used to determine the ore-forming age of No.6 orebody in Kirin Plant and No. 1 orebody of Mine Plant. The results show that the mineralization ages of the two deposits in Huize ultra-large lead-zinc orefield are the same, with 226 ± 15 Ma in the Kirin factory deposit and 225 ± 38 Ma in the mines. If all 13 samples from the two ore bodies Is calculated as an isochronal line and still shows a good linear relationship on the isochrone graph with an isochron age of 222 ± 14 Ma. Based on the geologic and geochemical data, it is considered that the two deposits are of the same-stage metallogeny Of the product. The ore-forming epoch of the Huize ultra-large lead-zinc deposit obtained in this paper is close to the Emeishan basaltic diagenesis (about 250 Ma) in the southwestern China within the error range and provides a date for "the genetic association between Emei magmatism and lead-zinc mineralization Evidence.