Platinum-group elements and gold in base metal sulfides, platinum-group minerals, and Re-Os isotope compositions of the Uitkomst complex, South Africa

Trubač, Jakub; Ackerman, Lukáš; Gauert, Ch.; Ďurišová, Jana; Hrstka, Tomáš

doi:https://dx.doi.org/10.5382/econgeo.2018.4557

Number of the records: 1

Platinum-group elements and gold in base metal sulfides, platinum-group minerals, and Re-Os isotope compositions of the Uitkomst complex, South Africa

1.

SYSNO ASEP	0488682
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Platinum-group elements and gold in base metal sulfides, platinum-group minerals, and Re-Os isotope compositions of the Uitkomst complex, South Africa
Author(s)	Trubač, Jakub (GLU-S)_{ORCID, RID, SAI} Ackerman, Lukáš (GLU-S)_{RID, SAI, ORCID} Gauert, Ch. (ZA) Ďurišová, Jana (GLU-S)_{RID, SAI} Hrstka, Tomáš (GLU-S)_{RID, SAI}
Source Title	Economic Geology. - : Society of Economic Geologists - ISSN 0361-0128 Roč. 113, č. 2 (2018), s. 439-461
Number of pages	23 s.
Publication form	Print - P
Language	eng - English
Country	US - United States
Keywords	binary alloys ; copper compounds ; economic geology ; gold ; iridium ; isotopes ; ore deposits ; osmium ; palladium ; platinum ; platinum metals ; pyrites ; Rhenium ; rhenium alloys ; ruthenium ; solid solutions ; sulfur compounds ; crustal materials ; mass-balance calculations ; massive sulfides ; mineralized zone ; monosulfide solid solutions ; platinum group elements ; platinum group elements (PGEs) ; platinum group minerals
Subject RIV	DB - Geology ; Mineralogy
OECD category	Geology
R&D Projects	GA13-15390S GA ČR - Czech Science Foundation (CSF)
Institutional support	GLU-S - RVO:67985831
UT WOS	000429317200006
EID SCOPUS	85043366492
DOI	10.5382/econgeo.2018.4557
Annotation	The Uitkomst Complex is a Ni-Cu-PGE-Cr-Co mineralized composite mafic-ultramafic intrusion situated in South Africa. The platinum-group elements (PGEs), Re and Au contents in base metal sulfides (BMS), and Re-Os isotope compositions were determined, as well as the occurrence of associated platinum-group minerals (PGMs) in the various mineralized zones of the complex. BMS within the complex have elevated PGE and Au contents, with the highest values (average of ~10 ppm total PGE) for the massive sulfide body, much lower than the values for BMS from the nearby Bushveld Complex. Pentlandite, as major PGE carrier, hosts most of the Pd, whereas pyrrhotite is characterized by elevated iridium subgroup platinum-group element (IPGE - Os, Ir, Ru) content lacking Pd. Chalcopyrite occasionally serves as a carrier of Au. Minor pyrite concentrates Rh and Re. Mass balance calculations show that BMS play a crucial role in IPGE deportment, whereas they accommodate only up to ~60% of the total Pd. The initial :¹⁸⁷Os/¹⁸⁸Os values for the whole Uitkomst suite indicate a significant but variable contribution of crustal material to mantle-derived parental melts. Platinum-group elements forming inclusions or presented in solid solution within BMS appear to contribute less to the overall PGE grade than the associated PGMs. The data support the model of a sulfide-oversaturated Uitkomst magma forming a monosulfide solid solution (mss) cumulate as massive sulfide orebody under low-R factor conditions in a shallow conduit after escape of an evolved PGE-rich sulfide liquid from the chamber, leaving the mss relatively poor in PGEs.
Workplace	Institute of Geology
Contact	Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272
Year of Publishing	2019

Number of the records: 1