00000nam 2200000zi 4500 9.913633 CaOODSP 20251031142448 m o d f cr mn||||||||| 220721t20222022onca ob f000 0 eng d CaOODSP eng rda CaOODSP n-cn-yk M183-2/8895E-PDF Pinet, N., author. Exploring the link between organic matter and Carlin-type gold mineralization : new insights from Yukon deposits / N. Pinet, O.H. Ardakani, J. Cesar, D.C. Petts, C. Debuhr, and P.J. Sack. [Ottawa] : Geological Survey of Canada, 2022. ©2022 1 online resource (22 pages) : illustrations (chiefly colour). text txt rdacontent computer c rdamedia online resource cr rdacarrier Open file ; 8895 Includes bibliographical references (pages 20-22). "The link between organic matter and gold in sediment-hosted Carlin-type deposits is controversial. This study aims to tackle this potential link by documenting the occurrence of organic matter in a single borehole from a Carlin-type gold deposit in Yukon and by considering, in a preliminary way, the spatial and/or temporal relationship between organic matter and gold mineralization. The sedimentary succession hosting the Conrad deposit was relatively rich in organic matter, possibly related to Archea. Despite the high maturation of samples, the total organic carbon (TOC) content of the limestone unit averages 1.31 wt. % (maximum = 3.18 wt. %). Petrographic observations indicate that pore and fracture filling pyrobitumen is the dominant organic matter maceral in the studied samples. This type of pyrobitumen was matured after its emplacement, indicating that hydrocarbon fluids cannot have served as an agent for gold transport. Pyrobitumen disseminated in the rock or associated with stylolites are also documented. The correlation between TOC and Tl (the best proxy for Au) for selected samples and the high As content of pyrobitumen filling pores may suggest a link between organic matter content and gold deposition, but this was not demonstrated by LA-ICP-MS micro-scale mapping. This study also highlights the challenges of establishing a direct spatial relationship between 'invisible' gold and very small (< 10 μm) pyrobitumen particles"--Abstract, page 1. Gold ores Geology Yukon. Gold ores Yukon Analysis. Or Gisements Géologie Yukon. Or Gisements Yukon Analyse. Geological Survey of Canada, issuing body. Open file (Geological Survey of Canada) 8895. (CaOODSP)9.506878 PDF 19.61 MB https://publications.gc.ca/collections/collection_2022/rncan-nrcan/m183-2/M183-2-8895-eng.pdf HTML N/A https://doi.org/10.4095/330086