Controls on Metal Distributions at the Lisheen and Silvermines Deposits: Insights into Fluid Flow Pathways in Irish-Type Zn-Pb Deposits

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Title: Controls on Metal Distributions at the Lisheen and Silvermines Deposits: Insights into Fluid Flow Pathways in Irish-Type Zn-Pb Deposits
Authors: Torremans, Koen
Kyne, Roisin
Doyle, Robert
Güven, John F.
Walsh, John J.
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Date: 1-Nov-2018
Online since: 2019-05-22T13:27:47Z
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.
Funding Details: European Commission Horizon 2020
European Commission - European Regional Development Fund
Science Foundation Ireland
Type of material: Journal Article
Publisher: GeoScienceWorld
Journal: Economic Geology
Volume: 113
Issue: 7
Start page: 1455
End page: 1477
Copyright (published version): 2018 Society of Economic Geologists
Keywords: MineralizationIrelandBasinal trapsLead-zinc depositsOrebodiesFault zones
DOI: 10.5382/econgeo.2018.4598
Language: en
Status of Item: Peer reviewed
Appears in Collections:Earth Sciences Research Collection

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