The Vein Hosted Copper Deposits of the Allihies Mining Area, Southwest Ireland — A New Structural and Chronological Evaluation
Posted on 2020-02-28 - 10:46
This paper presents new data for historic vein-hosted copper sulphide deposits in the Upper Palaeozoic Munster and South Munster Basins of southwest Ireland. Detailed mapping, 3D modelling, fluid inclusion microthermometry and geochronology from the Allihies area of the Beara Peninsula, have led to a new interpretation of the timing and development of ore mineralisation. Macro- and microstructural studies reveal that the ore-bearing, mainly E–W striking quartz veins are directly related to early extensional, basinal normal faults. Molybdenite Re–Os dating of the main-stage Cu lode yield ages from 367.3 ± 5.5 to 366.4 ± 1.9 Ma. This early vein system experienced subsequent late Carboniferous Variscan deformation, including cleavage development, sinistral SW–NE strike slip faulting, cataclastic deformation and recrystallization. The new timing of Cu mineralisation in SW Ireland has major implications for its relationship to the base metal deposits of the Irish Midlands.
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Lang, Jürgen; Meere, Patrick A.; Unitt, Richard P.; Johnson, Sean C.; Solferino, Giulio; Torremans, Koen; et al. (2020). The Vein Hosted Copper Deposits of the Allihies Mining Area, Southwest Ireland — A New Structural and Chronological Evaluation. Geological Society of London. Collection. https://doi.org/10.6084/m9.figshare.c.4875015.v1
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AUTHORS (8)
JL
Jürgen Lang
PM
Patrick A. Meere
RU
Richard P. Unitt
SJ
Sean C. Johnson
GS
Giulio Solferino
KT
Koen Torremans
DS
David Selby
RK
Roisin Kyne
CATEGORIES
KEYWORDS
Allihies Mining AreaCu mineralisationBeara Peninsulabase metal depositsmicrostructural studiesAllihies areatimingmain-stage Cu lodecataclastic deformationVein Hosted Copper DepositsChronological EvaluationCarboniferous Variscan deformationquartz veinscleavage developmentUpper Palaeozoic MunsterNew StructuralSW IrelandSouth Munster Basinsfluid inclusion microthermometryIrish Midlandsvein system3 D modellingore mineralisationvein-hosted copper sulphide depositsGeology