Models for the generation of metalliferous hydrothermal systems within sedimentary rocks, and their applicability to the Irish Carboniferous Zn-Pb deposits

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Authors:Lydon, John W.
Author Affiliations:Primary:
Geol. Surv. Can., Ottawa, ON, Canada
Other:
Tara Mines, Ireland
U. S. Borax, United States
Geol. Surv. Irel., Ireland
Volume Title:Geology and genesis of mineral deposits in Ireland
Volume Authors:Andrew, Colin J., editor; Crowe, R. W. A.; Finlay, S.; Pennell, W. M.; Pyne, J. F.
Source:Geology and genesis of mineral deposits in Ireland, edited by Colin J. Andrew, R. W. A. Crowe, S. Finlay, W. M. Pennell and J. F. Pyne, p.555-577. Publisher: Ir. Assoc. Econ. Geol., Dublin, Ireland. ISBN: 0-9509894-1-X
Publication Date:1986
Note:In English. 83 refs.; illus. incl. 1 table, geol. sketch maps
Summary:A review of various genetic theories concludes that, on the basis of their depositional environments some of the deposits have Sedex characteristics while others have MVT characteristics. In terms of geological setting, they are more closely comparable to the Sedex class. It is proposed that the ore solutions were Old Red Sandstone formational brines containing metals leached from clay minerals and iron oxide pigments. Hydraulic sealing and thermal insulation caused geopressuring of these brines during Lower Carboniferous deposition, and they were expelled to the surface when the geopressured aquifers were ruptured by faulting. [R.E.]
Subjects:Carboniferous; Devonian; Dinantian; Economic geology; Fluid inclusions; Hydrothermal alteration; Inclusions; Interpretation; Lead-zinc deposits; Metal ores; Metasomatism; Mineral deposits, genesis; Mineralization; Mississippi valley-type deposits; Models; Old Red Sandstone; Ore-forming fluids; P-T conditions; Paleozoic; Sedimentary rocks; Stratiform deposits; Europe; Ireland; Western Europe; Hydrothermal processes; Sedex type
Abstract Numbers:87M/5715
Record ID:1989073858
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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