Trace Element Characteristics of Pyrite and Arsenopyrite from the Golden Ridge Gold Deposit, New Brunswick, Canada: Implications for Ore Genesis

The Golden Ridge gold deposit is located in southwestern New Brunswick, in the Canadian Appalachians. Gold mineralization is consistently associated with acicular arsenopyrite, and to a lesser degree with pyrite, disseminated in host rocks, sulphide veinlets, quartz-carbonate veins, and the breccia...

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Published in:Minerals (Basel) 2023-07, Vol.13 (7), p.954
Main Authors: Cardenas-Vera, Alan, MacDonald, Moya, Lentz, David R., Thorne, Kathleen G.
Format: Article
Language:English
Subjects:
Antimony
Arsenic
Arsenopyrite
Bismuth
Breccia
Carbonates
Copper
Crystal lattices
Crystallization
Enrichment
epithermal deposit
Fault lines
Geology
Gold
Gold industry
Golden Ridge gold deposit
Heavy metals
Inclusions
invisible gold
Mineralization
Nanoparticles
Pollutant deposition
Pyrite
Quartz
Solid solutions
Sulfides
Sulfur compounds
Sulphides
Trace elements
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Lentz, David R.
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description The Golden Ridge gold deposit is located in southwestern New Brunswick, in the Canadian Appalachians. Gold mineralization is consistently associated with acicular arsenopyrite, and to a lesser degree with pyrite, disseminated in host rocks, sulphide veinlets, quartz-carbonate veins, and the breccia matrix. According to petrographic-based textural differences, four types of pyrite and two types of arsenopyrite are recognized with associated assemblages. Based on SEM-BSE imaging and LA-ICP-MS spot analyses of the different types of pyrites and arsenopyrites, “invisible gold” (solid solution in the crystal lattice of pyrite and arsenopyrite or
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The third and fourth pulses were enriched in both arsenic and gold and precipitated Py-III, then coprecipitated Py-IV and Asp-II, which constitute the most important Au depositional episodes. The repeated occurrence of growth zones with Au enrichment in the arsenian pyrites (Py-II, Py-III, and Py-IV) indicate surface growth during metal deposition and disequilibrium crystallization processes.</description><identifier>ISSN: 2075-163X</identifier><identifier>EISSN: 2075-163X</identifier><identifier>DOI: 10.3390/min13070954</identifier><language>eng</language><publisher>Basel: MDPI AG</publisher><subject>Antimony ; Arsenic ; Arsenopyrite ; Bismuth ; Breccia ; Carbonates ; Copper ; Crystal lattices ; Crystallization ; Enrichment ; epithermal deposit ; Fault lines ; Geology ; Gold ; Gold industry ; Golden Ridge gold deposit ; Heavy metals ; Inclusions ; invisible gold ; Mineralization ; Nanoparticles ; Pollutant deposition ; Pyrite ; Quartz ; Solid solutions ; Sulfides ; Sulfur compounds ; Sulphides ; Trace elements</subject><ispartof>Minerals (Basel), 2023-07, Vol.13 (7), p.954</ispartof><rights>COPYRIGHT 2023 MDPI AG</rights><rights>2023 by the authors. 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Gold mineralization is consistently associated with acicular arsenopyrite, and to a lesser degree with pyrite, disseminated in host rocks, sulphide veinlets, quartz-carbonate veins, and the breccia matrix. According to petrographic-based textural differences, four types of pyrite and two types of arsenopyrite are recognized with associated assemblages. Based on SEM-BSE imaging and LA-ICP-MS spot analyses of the different types of pyrites and arsenopyrites, “invisible gold” (solid solution in the crystal lattice of pyrite and arsenopyrite or &lt;100 nm nanoparticles) and micrometer-size inclusions were identified as the main forms of Au. Four syn-gold mineralization pulses of fluid are suggested. The initial hydrothermal fluid, which generated low-grade pyrite (Py-I) enriched in Sb, Pb, Cu, Co, Ni, and Bi, was followed by a second pulse of fluid enriched in arsenic and gold, generating coprecipitated Py-II and Asp-I. 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The third and fourth pulses were enriched in both arsenic and gold and precipitated Py-III, then coprecipitated Py-IV and Asp-II, which constitute the most important Au depositional episodes. The repeated occurrence of growth zones with Au enrichment in the arsenian pyrites (Py-II, Py-III, and Py-IV) indicate surface growth during metal deposition and disequilibrium crystallization processes.</abstract><cop>Basel</cop><pub>MDPI AG</pub><doi>10.3390/min13070954</doi><orcidid>https://orcid.org/0009-0003-2175-8363</orcidid><orcidid>https://orcid.org/0000-0002-9562-6211</orcidid><oa>free_for_read</oa></addata></record>
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ispartof Minerals (Basel), 2023-07, Vol.13 (7), p.954
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source ABI/INFORM Global (ProQuest); Publicly Available Content Database
subjects Antimony
Arsenic
Arsenopyrite
Bismuth
Breccia
Carbonates
Copper
Crystal lattices
Crystallization
Enrichment
epithermal deposit
Fault lines
Geology
Gold
Gold industry
Golden Ridge gold deposit
Heavy metals
Inclusions
invisible gold
Mineralization
Nanoparticles
Pollutant deposition
Pyrite
Quartz
Solid solutions
Sulfides
Sulfur compounds
Sulphides
Trace elements
title Trace Element Characteristics of Pyrite and Arsenopyrite from the Golden Ridge Gold Deposit, New Brunswick, Canada: Implications for Ore Genesis
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