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TitleGold mineralization at the Anomaly A Deposit, Clarence Stream area, southwestern New Brunswick: distal deposits of a syn-deformational intrusion-related gold system?
AuthorWatters, S; Castonguay, S; Lutes, G G; McLeod, M J
SourceMetallogeny and setting of gold systems in southern New Brunswick: implications for exploration in the northern Appalachians; by Thorne, K G (ed.); Castonguay, S (ed.); Exploration and Mining Geology vol. 17, no. 1-2, 2008 p. 67-84,
Alt SeriesEarth Sciences Sector, Contribution Series 2004258
Mediapaper; on-line; digital
RelatedThis publication is contained in Thorne, K G; Castonguay, S; (2008). Metallogeny and setting of gold systems in southern New Brunswick: implications for exploration in the northern Appalachians, Exploration and Mining Geology vol. 17 no. 1-2
File formathtml; pdf (Adobe® Reader®)
ProvinceNew Brunswick
AreaClarence Stream
Lat/Long WENS-67.1667 -67.0000 45.3833 45.3333
Subjectseconomic geology; structural geology; geochemistry; mineral occurrences; mineral potential; gold; mineralization; structural features; strain analysis; strain; deformation; turbidites; alteration; vein deposits; veins; paragenesis; faults; faults, thrust; St. Croix Belt; Kendall Mountain Formation; Paleozoic; Ordovician
Illustrationslocation maps; graphs; diagrams; cross-sections; photographs; photomicrographs; tables
ProgramTargeted Geoscience Initiative (TGI-1), 2000-2003
AbstractGold-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.