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GEOREF RECORD

Platinum precipitation in the Waterberg Deposit, Naboomspruit, South Africa

I. McDonald, D. Ohnenstetter, J. P. Rowe, M. Tredoux, R. A. D. Pattrick and D. J. Vaughan
Platinum precipitation in the Waterberg Deposit, Naboomspruit, South Africa (in Special issue commemorating the 75th anniversary of the discovery of the Merensky Reef, R. G. Cawthorn (editor))
South African Journal of Geology (September 1999) 102 (3): 184-191

Abstract

Quartz veins located northwest of Naboomspruit in the Northern Province of South Africa contain native platinum, Pt-Pd alloys, and at least two Pt-O species. Platinum shows a series of close textural associations with monazite [Ce(La,Y,Th)PO (sub 4) ]. The field relations, gangue mineralogy, and fluid inclusions trapped inside quartz in contact with platinum indicate probable fluid temperatures of 200-300 degrees C and a low-pressure environment. This suggests that the Naboomspruit veins represent a new class of platinum deposit which is broadly comparable with some epithermal gold deposits. The ore fluid was highly oxidized with a low salinity and generated extensive replacement of feldspar in the wall rocks. Increase in pH generated by wall-rock reactions is seen as an important mechanism in Pt precipitation, and the presence of reniform mixtures of platinum, Pt-Pd alloy, and Pt-O species are believed to reflect annealing of metal and alloy from an originally amorphous, hydrated Pt-O precursor (possibly resembling PtO.nH (sub 2) O). The close association between monazite and platinum is obvious but enigmatic. An electronic interaction between Ce and Pt producing a lowering of surface energy on Pt during the early stages of nucleation is suggested as having a role in this association.


ISSN: 1012-0750
EISSN: 1996-8590
Coden: TGSAA3
Serial Title: South African Journal of Geology
Serial Volume: 102
Serial Issue: 3
Title: Platinum precipitation in the Waterberg Deposit, Naboomspruit, South Africa
Title: Special issue commemorating the 75th anniversary of the discovery of the Merensky Reef
Affiliation: University of Greenwich, School of Earth and Environmental Sciences, Kent, United Kingdom
Affiliation: University of the Witwatersrand, Geology Department, Wits, South Africa
Pages: 184-191
Published: 199909
Text Language: English
Publisher: Bureau for Scientific Publications, Pretoria, South Africa
References: 26
Accession Number: 2000-011851
Categories: Economic geology, geology of ore deposits
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, geol. sketch map
S24°45'00" - S24°15'00", E28°25'00" - E28°45'00"
Secondary Affiliation: CNRS-CRPG, FRA, FranceUniversity of Leeds, GBR, United KingdomUniversity of Cape Town, ZAF, South AfricaUniversity of Manchester, GBR, United Kingdom
Country of Publication: South Africa
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200004
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