eCite Digital Repository

Gold and trace element zonation in pyrite using a laser imaging technique: Implications for the timing of gold in orogenic and Carlin-style sediment-hosted deposits

Citation

Large, RR and Danyushevsky, LV and Hollitt, CP and Maslennikov, V and Meffre, SJM and Gilbert, SE and Bull, SW and Scott, RJ and Emsbo, P and Thomas, HV and Singh, B and Foster, JG, Gold and trace element zonation in pyrite using a laser imaging technique: Implications for the timing of gold in orogenic and Carlin-style sediment-hosted deposits, Economic Geology and The Bulletin of The Society of Economic Geologists, 104, (5) pp. 635-668. ISSN 0361-0128 (2009) [Refereed Article]

DOI: doi:10.2113/gsecongeo.104.5.635

Abstract

Laser ablation ICP-MS imaging of gold and other trace elements in pyrite from four different sediment hosted gold-arsenic deposits has revealed two distinct episodes of gold enrichment in each deposit: an early synsedimentary stage where invisible gold is concentrated in arsenian diagenetic pyrite along with other trace elements, in particular, As, Ni, Pb, Zn, Ag, Mo, Te, V, and Se; and a later hydrothermal stage where gold forms as either free gold grains in cracks in overgrowth metamorphic and/or hydrothermal pyrite or as narrow, gold-arsenic rims on the outermost parts of the overgrowth hydrothermal pyrite. Compared to the diagenetic pyrites, the hydrothermal pyrites are commonly depleted in Ni, V, Zn, Pb, and Ag with cyclic zones of Co, Ni, and As concentration. The outermost hydrothermal pyrite rims are either As-Au rich, as in moderate- to high-grade deposits such as Carlin and Bendigo, or Co-Ni rich and As-Au poor as in moderate- to low-grade deposits such as Sukhoi Log and Spanish Mountain. The early enrichment of gold in arsenic-bearing syngenetic to diagenetic pyrite, within black shale facies of sedimentary basins, is proposed as a critical requirement for the later development of Carlin-style and orogenic gold deposits in sedimentary environments. The best grade sediment-hosted deposits appear to have the gold climax event, toward the final stages of deformation-related hydrothermal pyrite growth and fluid flow.

Item Details

Item Type:Refereed Article
Keywords:pyrite, trace elements, orogenic gold, Carlin deposits
Research Division:Earth Sciences
Research Group:Geology
Research Field:Ore Deposit Petrology
Objective Division:Mineral Resources (excl. Energy Resources)
Objective Group:Mineral Exploration
Objective Field:Precious (Noble) Metal Ore Exploration
Author:Large, RR (Professor Ross Large)
Author:Danyushevsky, LV (Professor Leonid Danyushevsky)
Author:Hollitt, CP (Mr Christopher Hollitt)
Author:Meffre, SJM (Dr Sebastien Meffre)
Author:Gilbert, SE (Ms Sarah Gilbert)
Author:Bull, SW (Dr Stuart Bull)
Author:Scott, RJ (Dr Robert Scott)
Author:Thomas, HV (Dr Helen Thomas)
Author:Foster, JG (Associate Professor Jeffrey Foster)
ID Code:61968
Year Published:2009
Web of Science® Times Cited:206
Deposited By:Centre for Ore Deposit Research - CODES CoE
Deposited On:2010-03-09
Last Modified:2011-10-03
Downloads:0

Repository Staff Only: item control page