Macrotextures, microtextures, and carbonate-sulfide relationships in stratiform, carbonate-hosted Zn-Pb orebodies of Silvermines, Ireland

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Authors:Kucha, H.
Author Affiliations:Primary:
Afedlin Fys.-Chem. Geol., B-3030 Heverlee, Belgium
Volume Title:Mineralium Deposita
Source:Mineralium Deposita, 24(1), p.48-55. Publisher: Springer-Verlag, Berlin, Federal Republic of Germany. ISSN: 0026-4598
Publication Date:1989
Note:In English. 14 refs.; illus. incl. 3 tables, geol. sketch map
Summary:Ore-stage carbonates of the Silvermines stratiform orebodies have increased Zn and Pb and high Fe and Mn content. A major microtexture observed is produced by the replacement of carbonate allochems by dolomite, Fe-dolomite, and siderite followed by the replacement of carbonates by sulphides. Generally, the process of replacement took place while the former fabric of the host carbonates was preserved. The reactivity of metal carbonates with S favoured the concentration of Pb and Zn in the sulphide and of Fe and Mn in the carbonate form. Sulphide-carbonate reactions probably maintained a high permeability in the ore zone over an extended period of time eventually producing a high-grade ore from solutions rich in Fe and Mn but poor in Zn and Pb. Initial porosity and permeability created by gravity flows controlled the mineralizing process at the beginning, but later stages were probably controlled by replacements i.e. sulphide-carbonate reactions. [L.G.L.]
Subjects:Carbonates; Economic geology; Fabric; Host rocks; Lead-zinc deposits; Metal ores; Metasomatism; Stratiform deposits; Sulfides; Textures; Europe; Ireland; Western Europe; Silvermines
Abstract Numbers:90M/0388
Record ID:1990008011
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom, Reference includes data from Geoline, Bundesanstalt fur Geowissenschaften und Rohstoffe
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