CGRG Bibliography of Canadian Geomorphology
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Author : Campbell, H.E.; Broster, B.E.; and Parkhill, M.A.
Date : 2011.
Title : Glacial dispersal patterns from the Mount Fronsac North Zn-Pb-Cu-Ag massive sulfide deposit, New Brunswick, Canada.
Publication : Joint Annual Meeting of Geological Association of Canada, the Mineralogical Association of Canada, the Society of Economic Geologists and the Society for Geology Applied to Mineral Deposits. May 25-27, 2011. University of Ottawa, Ottawa, Ontario.
Issue :
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Abstract
Assessment of local scale geochemical patterns in glacial till over mineralized bedrock is difficult as the concentration of elements is dependent on several factors including; bedrock genesis, subsequent alteration, remobilization or tectonic deformation, topographic relief and attitude of mineralized zones, glacier flow direction and dynamics, thickness and type of till, and pre- and post-glacial weathering. Varied dispersal patterns arising from these factors are examined in order to understand mineralized concentrations in till from Mount Fronsac North. Two hundred thirty six samples were collected and analyzed from thin (<2m) deformation and lodgement till overlying the Mount Fronsac North volcanogenic sediment hosted massive sulfide deposit in northern New Brunswick. Till samples were subjected to aqua regia digestion/ICP-MS/ES and CVAFS analysis. Mount Fronsac drill core and gossan samples from Mount Fronsac were examined. Element concentrations in Mount Fronsac till show three distinct geochemical dispersal patterns: 1) a well defined fan shaped pattern (Pb, Ag, Cu), 2) a distinct ribbon pattern trending west to east (Ni, Co, Cr) and 3) an arcuate pattern (Hg, Cd). Comparisons between geochemical distribution and concentrations in Mount Fronsac till, bedrock and weathered sulfides (gossan) indicate that surface till geochemical patterns are the result of bedrock mineralization and hydrothermal alteration, pre-glacial weathering, glaciation (erosion, entrainment, comminution and deposition down-ice) and post-glacial weathering. Amalgamation of bedrock, gossan and till data from Mount Fronsac North yields a model relating till geochemical signatures to bedrock geochemical sources.
Bibliography of Canadian Geomorphology