The genesis of Cu-bearing quartz veins by metamorphic remobilization from stratiform red bed deposits, SW County Cork, Ireland

Autor: Ni Wen, Anthony E. Fallick, J. R. Ashworth, R. A. Ixer, Adrian J. Boyce
Rok vydání: 1996
Předmět:
Zdroj: Mineralogy and Petrology. 57:73-89
ISSN: 1438-1168
0930-0708
DOI: 10.1007/bf01161622
Popis: Polymetallicmajor veins of the West Carbery district (County Cork) are compared with the nearby stratiform-disseminated copper mineralization in metasedimentary rocks, containingminor veins (metamorphic quartz veins and veinlets). These stratiform deposits are hosted by non-marine Devonian sediments (Old Red Sandstone), metamorphosed in the Hercynian orogeny. In sulphides from the stratiform deposits and minor veins, isotopic compositions of sulphur (δ34S) range from − 21.00 to + 5.14%0, consistent with the vein sulphide being remobilized stratiform-disseminated sulphide, and the latter being of diagenetic bacteriogenic origin. Sulphate (barite), found in veins separate from the sulphides, has δ34S + 12.3 to + 15.7%0. consistent with groundwater origin. In minor-vein quartz, fluid inclusions have homogenization temperatures consistent with trapping under the estimated peak-metamorphic conditions (300–400°C, 1–3 kbar).
Databáze: OpenAIRE
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