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Controls on metal distributions at the Lisheen and Silvermines Deposits; insights into fluid flow pathways in irish-type Zn-Pb deposits

Koen Torremans, Roisin Kyne, Robert Doyle, John F. Guven and John J. Walsh
Controls on metal distributions at the Lisheen and Silvermines Deposits; insights into fluid flow pathways in irish-type Zn-Pb deposits
Economic Geology and the Bulletin of the Society of Economic Geologists (November 2018) 113 (7): 1455-1477

Abstract

The world-class Irish Zn-Pb(-Ag) deposits occur within one of the world's major metallogenic provinces. While it has been well documented that these orebodies are structurally controlled, exactly how fluids migrated from source to trap is still poorly understood. Using 3-D modeling techniques, the current study investigates metal distribution patterns at the Silvermines and Lisheen deposits to gain insights into fluid pathways and structural controls on mineralization. Distinct points along segmented normal faults are identified as the feeders to individual orebodies, allowing hot, hydrothermal, metal-bearing fluids to enter host rocks and form orebodies. These points are characterized by highly localized and elevated Ag, Cu, Co, Ni, and As concentrations as well as low Zn/Pb ratios, which increase away from the feeders. Metal distributions are initially controlled by major and minor normal faults and subsequently affected by later oblique-slip dextral and strike-slip faults. High-tonnage areas without typical feeder signals are interpreted to be structural trap sites, which are distal to fault-controlled feeder points. This study highlights both the importance of a well-connected plumbing system for metal-bearing fluids to reach their basinal traps and the control that an evolving structural framework has on spatial distribution of metals.


ISSN: 0361-0128
EISSN: 1554-0774
Coden: ECGLAL
Serial Title: Economic Geology and the Bulletin of the Society of Economic Geologists
Serial Volume: 113
Serial Issue: 7
Title: Controls on metal distributions at the Lisheen and Silvermines Deposits; insights into fluid flow pathways in irish-type Zn-Pb deposits
Affiliation: University College Dublin, School of Earth Sciences, Dublin, Ireland
Pages: 1455-1477
Published: 201811
Text Language: English
Publisher: Economic Geology Publishing Company, Lancaster, PA, United States
References: 92
Accession Number: 2019-005211
Categories: Economic geology, geology of ore deposits
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. block diags., sects., strat. cols., geol. sketch maps
N52°15'00" - N53°00'00", W08°45'00" - W07°45'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Abstract, Copyright, Society of Economic Geologists. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2019
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