00000nam 2200000za 4500 9.836621 CaOODSP 20230131161137 cr ||||||||||| 170512s2017 oncabd ob f000 0 eng d CaOODSP eng n-cn-yk M41-11/58-2017E-PDF Macmillan Pass, Yukon SEDEX mineralisation [electronic resource] : the geochemical characterization of a vent complex / J.M. Magnall ... [et al.]. Macmillan Pass SEDEX mineralisation : the geochemical characterization of a vent complex [Ottawa] : Natural Resources Canada, 2017. [1] p. : charts (some col.), col. ill., map Geological Survey of Canada, scientific presentation ; 58 Caption title. "Presented at Whistler 2013: Geoscience for Discovery. Date presented: September 24-27, 2013." Includes bibliographical references. “The Targeted Geoscience Initiative (TGI-4) is a collaborative federal geoscience program that provides industry with the next generation of geoscience knowledge and innovative techniques to better detect buried mineral deposits, thereby reducing some of the risks of exploration. Samples from vent complexes of the Tom and Nidd sedimentary exhalative (SEDEX) deposits (Selwyn Basin) are documented. Stable isotope analyses (C and O) of mineral separates and bulk geochemistry indicate the influence of both deep and shallow processes on the chemistry of the hydrothermal fluid. Evidence for the breakdown of organic matter is preserved in highly negative and positive d13C values. Rare earth element profiles (REE) display positive Eu anomalies and negative Ce anomalies, indicating the mixing of a deep, hot, reducing fluid with an oxidizing fluid (seawater). Discounting Pb, Zn and Ba (ore components), vent samples have enrichments above upper crustal values for Au, Ag, As, Cd, Cu, Ge, In, Mo, Sb, Sn and Ta. Notably, Au enrichments in two samples from Tom are in excess of 100ppb Au"--Summary provided by publisher. gccst Geology gccst Geochemistry gccst Petrology Magnall, Joseph M. Canada. Natural Resources Canada. Geological Survey of Canada. SEG 2013 (2013 : Whistler, B.C.) Scientific presentation (Geological Survey of Canada) 58 (CaOODSP)9.820265 PDF 7.06 MB https://publications.gc.ca/collections/collection_2017/rncan-nrcan/M41-11-58-2017-eng.pdf 300552