Fahlores from Porphyry Cu–(Mo) Deposits of the Urals

IF 0.8 4区 地球科学 Q3 GEOLOGY
O. Yu. Plotinskaya, E. V. Kovalchuk
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Abstract

The typomorpic features of the minerals of the fahlore group from three porphyry deposits of the Urals: the Mikheevskoe and Tomino porphyry copper deposits (the Southern Urals) and Talitsa porphyry Mo deposit (the Middle Urals) are studied. In the deposits studied, the fahlore- group minerals belong either to late mineral assemblages of the porphyry stage or to subepithermal veins. They vary in composition from tennantite to tetrahedrite with variable Fe and Zn contents. Contents of Cd, Co, Te, Bi, Ag, and Se are usually insignificant. However, an exception is fahlore of late generation from the Mikheevskoe deposit, which is represented by argentotetrahedrite–(Fe) and fahlore associated with bornite from the Tomino deposit, which corresponds to tennantite–tetrahedrite–(Cd) in composition. Most of the studied fahlore-group minerals are not characterized by complicated chemical zoning: they are either homogeneous or comprise a homogeneous core of intermediate tennantite–tetrahedrite composition and a rim with a dominating tetrahedrite end member. This evidences a relatively quiet deposition environment with no sharp variations of physicochemical parameters of ore-forming fluid, which in general is typical of porphyry deposits. Comparison with published data shows that the studied fahlores are similar in composition to those from “transitional” subepithermal mineralization.

Abstract Image

乌拉尔地区斑岩型铜(钼)矿床的法洛石
摘要 研究了乌拉尔地区三个斑岩矿床(Mikheevskoe 和 Tomino 斑岩铜矿床(乌拉尔南部)和 Talitsa 斑岩钼矿床(乌拉尔中部))中的花岗岩类矿物的类型特征。在所研究的矿床中,法洛尔族矿物属于斑岩阶段的晚期矿物集合体或次热液矿脉。它们的成分各不相同,从天锰矿到四面体矿,铁和锌的含量也不尽相同。镉、钴、碲、铋、银和硒的含量通常微乎其微。不过,Mikheevskoe 矿床晚期的长叶石是个例外,其代表成分是精四斜铁矿(Fe),而 Tomino 矿床与辉长岩伴生的长叶石在成分上与榍石-四斜铁矿(Cd)相对应。所研究的大多数长方体群矿物都没有复杂的化学分带:它们要么是均质的,要么是由中间成分为天锰矿-四面体矿的均质核心和端部成分为四面体矿的边缘组成。这证明沉积环境相对安静,成矿流体的物理化学参数没有剧烈变化,而这一般是斑岩矿床的典型特征。与已公布数据的比较表明,所研究的法洛石在成分上与 "过渡 "次热液成矿作用的法洛石相似。
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来源期刊
Geology of Ore Deposits
Geology of Ore Deposits 地学-地质学
CiteScore
1.10
自引率
14.30%
发文量
24
审稿时长
6-12 weeks
期刊介绍: Geology of Ore Deposits is a periodical covering the topic of metallic and nonmetallic mineral deposits, their formation conditions, and spatial and temporal distribution. The journal publishes original scientific articles and reviews on a wide range of problems in theoretical and applied geology. The journal focuses on the following problems: deep geological structure and geodynamic environment of ore formation; distribution pattern of metallogenic zones and mineral deposits; geology and formation environment of large and unique metallic and nonmetallic deposits; mineralogy of metallic and nonmetallic deposits; physicochemical and isotopic characteristics and geochemical environment of ore deposition; evolution of ore-forming systems; radiogeology and radioecology, economic problems in exploring, developing, and mining of ore commodities.
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