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Metamorphosed and Hydrothermal Carbonaceous Matter at the Orogenic-Type, Sediment-Hosted Gold Deposits of West Africa
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SYSNO ASEP 0472936 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Metamorphosed and Hydrothermal Carbonaceous Matter at the Orogenic-Type, Sediment-Hosted Gold Deposits of West Africa Author(s) Kříbek, B. (CZ)
Knésl, I. (CZ)
Laufek, F. (CZ)
Sýkorová, Ivana (USMH-B) RID, ORCID
Machovič, V. (CZ)
Zachariáš, J. (CZ)Source Title Mineral resources in a sustainable world. Proceedings of the 13th Biennial SGA Meeting. - Vandoeuvre-les-Nancy : ASGA, 2015 - ISBN 978-2-85555-066-4 Pages s. 1941-1944 Number of pages 4 s. Publication form Print - P Action SGA Biennial Meeting on Mineral Resources in a Sustainable World /13./ Event date 24.08.2015 - 27.08.2015 VEvent location Nancy Country FR - France Event type WRD Language eng - English Country FR - France Keywords carbonaceous matter ; graphite ; gold Subject RIV DB - Geology ; Mineralogy Institutional support USMH-B - RVO:67985891 UT WOS 000374801300444 Annotation Chemical and physical properties of carbonaceous matter (CM) at Paleoproterozoic, shear zone-hosted gold deposits in Burkina Faso (the Inata deposit), Mali (the Syama deposit) and Ghana (the Obuashi and Bogoso deposits) were studied. Two types of CM are present at all studied deposits: metamorphosed and hydrothermal. Hydrothermal CM is commonly associated with gold mineralization. It forms veinlets in hydrothermally altered rocks and quartz veins, or irregular accumulations parallel or subparallel to C-type cleavage within shear zones. The isotopic composition of carbon in metamorphosed as well as hydrothermal CM (-26.2 to-33.1%o; PDB) indicates their biogenic origin. Optical properties, XRD and Raman spectra of metamorphosed and hydrothermal CM within a single deposit are similar. However, the degree of structural ordering and optical properties of CM vary at the individual studied deposits, depending on the metamorphic degree of ambient rocks. This suggests a close relationship between metamorphic temperatures and temperatures of hydrothermal fluids. Workplace Institute of Rock Structure and Mechanics Contact Iva Švihálková, svihalkova@irsm.cas.cz, Tel.: 266 009 216 Year of Publishing 2017
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