Počet záznamů: 1
Metamorphosed and Hydrothermal Carbonaceous Matter at the Orogenic-Type, Sediment-Hosted Gold Deposits of West Africa
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SYSNO ASEP 0472936 Druh ASEP C - Konferenční příspěvek (mezinárodní konf.) Zařazení RIV D - Článek ve sborníku Název Metamorphosed and Hydrothermal Carbonaceous Matter at the Orogenic-Type, Sediment-Hosted Gold Deposits of West Africa Tvůrce(i) Kříbek, B. (CZ)
Knésl, I. (CZ)
Laufek, F. (CZ)
Sýkorová, Ivana (USMH-B) RID, ORCID
Machovič, V. (CZ)
Zachariáš, J. (CZ)Zdroj.dok. Mineral resources in a sustainable world. Proceedings of the 13th Biennial SGA Meeting. - Vandoeuvre-les-Nancy : ASGA, 2015 - ISBN 978-2-85555-066-4 Rozsah stran s. 1941-1944 Poč.str. 4 s. Forma vydání Tištěná - P Akce SGA Biennial Meeting on Mineral Resources in a Sustainable World /13./ Datum konání 24.08.2015 - 27.08.2015 Místo konání Nancy Země FR - Francie Typ akce WRD Jazyk dok. eng - angličtina Země vyd. FR - Francie Klíč. slova carbonaceous matter ; graphite ; gold Vědní obor RIV DB - Geologie a mineralogie Institucionální podpora USMH-B - RVO:67985891 UT WOS 000374801300444 Anotace 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. Pracoviště Ústav struktury a mechaniky hornin Kontakt Iva Švihálková, svihalkova@irsm.cas.cz, Tel.: 266 009 216 Rok sběru 2017
Počet záznamů: 1