eCite Digital Repository

Defining trace-element alteration halos to skarn deposits hosted in heterogeneous carbonate rocks: Case study from the Cu-Zn Antamina skarn deposit, Peru

Citation

Escalante, A and Dipple, GM and Barker, SLL and Tosdal, R, Defining trace-element alteration halos to skarn deposits hosted in heterogeneous carbonate rocks: Case study from the Cu-Zn Antamina skarn deposit, Peru, Journal of Geochemical Exploration, 105 pp. 117-136. ISSN 0375-6742 (2010) [Refereed Article]

Copyright Statement

Copyright 2010 Elsevier B.V.

DOI: doi:10.1016/j.gexplo.2010.04.011

Abstract

The presence of geochemical anomalies, defining haloes around hydrothermal ore deposits, can be used to vector towards mineralization, or identify ore bodies buried at depth. Several important types of ore deposits, including skarn deposits, are often hosted within carbonate-rich sedimentary rocks. Identifying anomalous trace-element concentrations in carbonate rocks is complicated by variable lithology (i.e. siliciclastic component) and volume loss during hydrothermal alteration. In this study of the world-class Antamina skarn deposit in Peru, we use the ratio of metals:immobile elements (e.g. La, Al2O3) to differentiate genuine and false geochemical anomalies in limestones and marbles surrounding the skarn deposit. Unaltered limestones are used to define threshold values for metal:immobile element ratios (through use of the median value 2 median absolute deviations). Genuine anomalies are identified when metal concentrations exceed those predicted using median + 2 median absolute deviations. In addition, comparison of "four acid" and lithium-borate fusion analytical techniques reveals that the lower cost four-acid techniques give reliable results. Our approach can be used to identify geochemical anomalies and halos related to hydrothermal alteration of carbonate-rich rocks, which have direct application to skarn deposits.

Item Details

Item Type:Refereed Article
Keywords:skarn, geochemical halo, carbonate, copper
Research Division:Earth Sciences
Research Group:Geochemistry
Research Field:Exploration Geochemistry
Objective Division:Mineral Resources (excl. Energy Resources)
Objective Group:Mineral Exploration
Objective Field:Copper Ore Exploration
UTAS Author:Barker, SLL (Dr Shaun Barker)
ID Code:129547
Year Published:2010
Web of Science® Times Cited:8
Deposited By:CODES ARC
Deposited On:2018-12-05
Last Modified:2019-05-02
Downloads:0

Repository Staff Only: item control page