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Gold Mineralization at the Anomaly A Deposit, Clarence Stream Area, Southwestern New Brunswick: Distal Deposits of a Syn-Deformational Intrusion-Related Gold System?

S. Watters^1,*, S. Castonguay^2,, G.G. Lutes³ and M.J. McLeod¹

¹ New Brunswick Department of Natural Resources, Geological Surveys Branch, 207 Picadilly Road, P.O. Box 5040, Sussex, New Brunswick, E4E 5L2.
² Natural Resources Canada, Geological Survey of Canada—Québec division, rue de la Couronne, Québec, Québec, G1K 9A9.
³ Geological Consultant, 87 Venus Crescent, Hanwell, New Brunswick, E3C 1N1.

Correspondence: Corresponding Author: E-mail: scastong{at}nrcan.gc.ca

Gold-bearing mineralization at Anomaly A occurs in polydeformed Ordovician turbidites of the Kendall Mountain Formation of the St. Croix belt in southwestern New Brunswick, and is hosted by WSW-trending, shallow-dipping, brittle–ductile high-strain zones associated with the latest stage of the second of four regional deformation events. Gold-bearing syn-deformational stockwork, massive, and multiply brecciated quartz-sulfide veined zones form irregular pods and sheets up to several meters thick, which contain arsenopyrite, pyrrhotite, pyrite, stibnite, and a variety of rare minerals that are gold-bearing. Mineralized zones are enveloped by locally auriferous, weakly to intensely altered wall rock. Vein paragenesis includes: (1) early (pre- to syn-D₂) quartz-chlorite veins that are largely the product of migration of quartz by pressure solution; (2) crosscutting, multiphase, vuggy quartz-sulfide veins that contain most of the gold and are interpreted to be structurally controlled; (3) late, crosscutting, nondeformed, non-gold-bearing veins containing laumontite, chlorite, muscovite, quartz, fluorite, and base metal sulfides. Carbonate-poor alteration associated with zones of gold mineralization is lithology-specific, and appears to reflect overprinting of multiple events. Major elements removed during alteration include Si, Na, Mn, and Mg. The minor and trace elements removed include Co, Li, Sc, and possibly Sr, Ni, and Zn. Minor and trace elements added include Au, Ag, As, Sb, S, and possibly F, Cu, Pb, and Zr. On the basis of proximity, time constraints, and a similar ore mineral assemblage, gold mineralization at Anomaly A is interpreted to be a distal equivalent of the intrusion-related gold mineralization at the nearby Clarence Stream Main zone deposit.

Key Words: Clarence Stream • New Brunswick • intrusion-related gold • St. Croix belt • mineralized high-strain zone

This article has been cited by other articles:

				M.J. McLeod, D. Hoy, and K.G. Thorne History, Tectonic Setting, and Models for Instrusion-Related Gold Deposits in Southwestern New Brunswick, Canada: Examples from the Clarence Stream Area Exploration and Mining Geology, January 1, 2008; 17(1-2): 1 - 12. [Abstract] [Full Text] [PDF]

				J.-F. Ravenelle, G.G. Lutes, and A.J. Hynes Architecture of Gold Mineralization at Anomaly A of the Clarence Stream Deposits, Southern New Brunswick Exploration and Mining Geology, January 1, 2008; 17(1-2): 85 - 100. [Abstract] [Full Text] [PDF]