Metamorphosed and Hydrothermal Carbonaceous Matter at the Orogenic-Type, Sediment-Hosted Gold Deposits of West Africa

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985891%3A_____%2F15%3A00472936" target="_blank" >RIV/67985891:_____/15:00472936 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11310/15:10331671

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Metamorphosed and Hydrothermal Carbonaceous Matter at the Orogenic-Type, Sediment-Hosted Gold Deposits of West Africa

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Metamorphosed and Hydrothermal Carbonaceous Matter at the Orogenic-Type, Sediment-Hosted Gold Deposits of West Africa

Popis výsledku anglicky

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.

Druh

D - Stať ve sborníku

CEP obor

DB - Geologie a mineralogie

OECD FORD obor

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Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2015

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Mineral resources in a sustainable world. Proceedings of the 13th Biennial SGA Meeting

ISBN

978-2-85555-066-4

ISSN

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e-ISSN

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Počet stran výsledku

4

Strana od-do

1941-1944

Název nakladatele

ASGA

Místo vydání

Vandoeuvre-les-Nancy

Místo konání akce

Nancy

Datum konání akce

24. 8. 2015

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000374801300444