Fluid inclusion and stable isotope study of fault-related mineralization in Tyndrum area, Scotland

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Authors:Curtis, S. F.; Pattrick, R. A. D.; Jenkin, G. R. T.; Fallick, A. E.; Boyce, A. J.; Treagus, J. E.
Author Affiliations:Primary:
Leeds University, United Kingdom
University of St. Andrews, United Kingdom
University of Nottingham, United Kingdom
University of Glasgow, United Kingdom
University of Liverpool, United Kingdom
Volume Title:Transactions - Institution of Mining and Metallurgy. Section B: Applied Earth Science
Source:Transactions - Institution of Mining and Metallurgy. Section B: Applied Earth Science, Vol.102, p.B39-B47. Publisher: Institution of Mining and Metallurgy, London, United Kingdom. ISSN: 0371-7453
Publication Date:1993
Note:In English. 45 refs.; illus. incl. 3 tables, geol. sketch maps
Summary:Gold-bearing structures in this area formed from CO2-bearing fluids containing 6 eq.wt.% NaCl at 290-350 degrees C. Loss of CO2 (phase separation) from the fluids was one cause of mineral precipitation. Oxygen and H isotopic data suggest that the fluids were magmatic in origin but included an extra component: probably Lower Devonian meteoric water. Sulphur isotope ratios indicate two sources of S, one magmatic in character and the other the country rocks. In contrast, historically exploited base-metal veins in the area formed from highly saline (approx 15 eq.wt.% NaCl), relatively low T (140-200 degrees C) fluids with a different stable isotope signature from that of the Au veins. Comparison with data from other mineralization in the region suggests that the genesis of the Tyndrum Au veins is related to Caledonian magmatism; the mineralizing fluids could have evolved from an underlying magma that was either granitic or appinitic. [R.E.S.]
Subjects:Carbon dioxide; Copper ores; D/H; Devonian; Fault zones; Faults; Fluid inclusions; Gold ores; Hydrogen; Hydrothermal alteration; Inclusions; Intrusions; Iron ores; Isotope ratios; Isotopes; Lead-zinc deposits; Lower Devonian; Metal ores; Metasomatism; Mineral deposits, genesis; Mineralization; O-18/O-16; Ore-forming fluids; Oxygen; P-T conditions; Paleozoic; S-34/S-32; Stable isotopes; Stratiform deposits; Sulfides; Sulfur; Europe; Great Britain; Scotland; United Kingdom; Western Europe; Hydrothermal processes; Tyndrum Scotland
Abstract Numbers:94M/575
Record ID:1993032053
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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