Characteristics of Mineralization at the Main Zone of the Clarence Stream Gold Deposit, Southwestern New Brunswick, Canada: Evidence for an Intrusion-Related Gold System in the Northern Appalachian Orogen

Research Article| January 01, 2008 Characteristics of Mineralization at the Main Zone of the Clarence Stream Gold Deposit, Southwestern New Brunswick, Canada: Evidence for an Intrusion-Related Gold System in the Northern Appalachian Orogen K.G. Thorne; K.G. Thorne † 1New Brunswick Department of Natural Resources, PO Box 6000, Fredericton, New Brunswick, E3B 5H1. †Corresponding Author: E-mail: kay.thorne@gnb.ca Search for other works by this author on: GSW Google Scholar D.R. Lentz; D.R. Lentz 2Department of Geology, University of New Brunswick, PO Box 4400, Fredericton, New Brunswick, E3B 5A3. Search for other works by this author on: GSW Google Scholar D. Hoy; D. Hoy 3Freewest Resources Canada Inc., 855 Field Street, Thunder Bay, Ontario, P7B 6B6. Search for other works by this author on: GSW Google Scholar L.R. Fyffe; L.R. Fyffe 1New Brunswick Department of Natural Resources, PO Box 6000, Fredericton, New Brunswick, E3B 5H1. Search for other works by this author on: GSW Google Scholar L.J. Cabri L.J. Cabri 4Cabri Consulting Inc., 99 Fifth Avenue, Suite 122, Ottawa, Ontario, K1S 5P5. Search for other works by this author on: GSW Google Scholar Exploration and Mining Geology (2008) 17 (1-2): 13–49. https://doi.org/10.2113/gsemg.17.1-2.13 Article history received: 19 Dec 2005 accepted: 08 Mar 2008 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation K.G. Thorne, D.R. Lentz, D. Hoy, L.R. Fyffe, L.J. Cabri; Characteristics of Mineralization at the Main Zone of the Clarence Stream Gold Deposit, Southwestern New Brunswick, Canada: Evidence for an Intrusion-Related Gold System in the Northern Appalachian Orogen. Exploration and Mining Geology 2008;; 17 (1-2): 13–49. doi: https://doi.org/10.2113/gsemg.17.1-2.13 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentBy SocietyExploration and Mining Geology Search Advanced Search Abstract Mineralization at the Main zone of the Clarence Stream gold deposit in southwestern New Brunswick occurs within a parallel series of quartz veins that occupy a NE-trending, steeply north-dipping, brittle–ductile shear zone related to the nearby terrane-bounding Sawyer Brook fault. This deformation zone cuts volcaniclastic sedimentary and volcanic rocks of the Silurian Waweig Formation, and is intruded by mantle-derived East Branch Brook gabbroic dikes and a number of felsic dikes. Intermittent shear-zone reactivation during local magmatic activity induced heterogeneous deformation and alteration of the country rocks and dikes. The terminal phase of shearing is associated with narrow pegmatite-aplite dikes that grade laterally into granophyric granite, and into an auriferous quartz vein. Gold, aurostibite, and gold-antimony intergrowths, predominantly with vein quartz, are associated with a low ƒO2 sulfide mineral assemblage (pyrrhotite, arsenopyrite, and berthierite) that has a sulfur isotopic signature consistent with a magmatic source. Gold saturation and deposition occurred episodically between 300° and 360°C at low activity of sulfur, predominantly in response to pressure reduction during brittle failure combined with the effects of decreasing temperature and sulfidation reactions during fluid–wall-rock interaction. Geochronological studies demonstrate that the timing of the emplacement of the pegmatite-aplite dikes and associated auriferous veins overlap with that of the Early Devonian Magaguadavic granite. Moreover, the composition of the dikes is consistent with their derivation from this granite as late fractionates. The Main zone of the Clarence Stream deposit is therefore interpreted to be intrusion-related, with the Magaguadavic granite being the ultimate source of the gold-bearing fluids. You do not currently have access to this article.