Mineralizing fluids and metastable low-temperature inclusion brines at Llanharry iron deposit, South Wales

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Authors:Rankin, A. H.; Criddle, A. J.
Author Affiliations:Primary:
Imp. Coll., Dep. Geol., London, 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.94, p.B126-B132. Publisher: Institution of Mining and Metallurgy, London, United Kingdom. ISSN: 0371-7453
Publication Date:1985
Note:In English. 34 refs.; illus. incl. 3 tables
Summary:A case study is presented of metastable fluid inclusions in quartz and calcite from the hematite-goethite deposit in Carboniferous limestone at Llanharry, Glamorgan. Homogenization T of = or <98°C and two broad salinity groupings with 2-10 and 10-24 wt.% equiv. NaCl were found. It is suggested that descending ground-waters, which had acquired a high salinity and iron content from overlying Triassic red beds, interacted with episodic pulses of hotter, more dilute fluids that were derived from rocks of the adjacent Coal Measures basin by the mechanism of seismic pumping, which accompanied periodic fault reactivation. This model is applied also to similar deposits associated with Hercynian faults throughout the Llanharry-Taffs Well area of hematite deposits. [R.A.H.]
Subjects:Brines; Calcite; Carbonates; Economic geology; Fluid inclusions; Framework silicates; Geologic thermometry; Goethite; Hematite; Hydrothermal alteration; Inclusions; Iron ores; Metal ores; Metasomatism; Mineral deposits, genesis; Ore-forming fluids; Oxides; Paleosalinity; Quartz; Silica minerals; Silicates; Structural controls; Europe; Great Britain; United Kingdom; Wales; Western Europe; Hydrothermal processes; Llanharry; Southern Wales
Abstract Numbers:86M/1934
Record ID:1985085409
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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