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GEOREF RECORD

Compositional variations in oulankaite and a new series of argentoan oulankaite from the Lukkulaisvaara layered intrusion, northern Russian Karelia

Andrei Y. Barkov, Michael E. Fleet, Robert F. Martin and Mahmud Tarkian
Compositional variations in oulankaite and a new series of argentoan oulankaite from the Lukkulaisvaara layered intrusion, northern Russian Karelia (in Platinum-group elements; petrology, geochemistry, mineralogy, James E. Mungall (editor), William E. Meurer (editor) and Robert F. Martin (editor))
The Canadian Mineralogist (April 2004) 42, Part 2: 439-453

Abstract

Oulankaite, a complex base- and precious-metal stannosulphotelluride from the Nadezhda deposit in the Lukkulaisvaara layered intrusion, exhibits a considerable variation in composition. At the type locality, this unique species of PGM is associated with base-metal sulphides and PGM in hydrothermally altered pods and stringers of coarse-grained to pegmatitic gabbronorite within a sill-like body of microgabbronorite. Covariations of (Pd + Pt) and (Cu + Fe + Ag) are observed in Ag-poor oulankaite (< 0.1 wt % Ag) and in a new compositional series of argentoan oulankaite (up to 1.52 Ag pfu; Sigma atoms = 14). A revised generalized formula for oulankaite is suggested: (Pd,Pt) (sub 5+x) (Cu,Fe,Ag) (sub 4-x) SnTe (sub 2) S (sub 2) , with 0 < or = x < 1; the formula for the Ag-dominant analogue of oulankaite is (Pd,Pt) (sub 5+x) (Ag,Cu,Fe) (sub 4-x) SnTe (sub 2) S (sub 2 ) with 0 < or = x < 1. Two different substitution mechanisms exist in argentoan oulankaite, Ag-for-Cu and Pd-for-(Cu+Ag), whereas the composition of Ag-poor oulankaite is dominated by the Pd-for-Cu substitution. Micro-inclusions of Cl-rich ferropargasite (up to 3.25 wt % Cl) occur in both species. The argentoan oulankaite solid solution probably formed from microvolumes of a late-stage liquid or fluid rich in Pd, Ag, Cu, Sn, Te and S, consistent with the Pd-(Pt)-Ag mineralization in the Nadezha deposit.


ISSN: 0008-4476
EISSN: 1499-1276
Coden: CAMIA6
Serial Title: The Canadian Mineralogist
Serial Volume: 42, Part 2
Title: Compositional variations in oulankaite and a new series of argentoan oulankaite from the Lukkulaisvaara layered intrusion, northern Russian Karelia
Title: Platinum-group elements; petrology, geochemistry, mineralogy
Author(s): Barkov, Andrei Y.Fleet, Michael E.Martin, Robert F.Tarkian, Mahmud
Author(s): Mungall, James E.editor
Author(s): Meurer, William E.editor
Author(s): Martin, Robert F.editor
Affiliation: University of Western Ontario, Department of Earth Sciences, London, ON, Canada
Affiliation: University of Toronto, Department of Geology, Toronto, ON, Canada
Pages: 439-453
Published: 200404
Text Language: English
Publisher: Mineralogical Association of Canada, Ottawa, ON, Canada
Meeting name: 9th international platinum symposium
Meeting location: Billings, MT, USA, United States
Meeting date: 20020725July 25-29, 2002
References: 17
Accession Number: 2007-049928
Categories: Mineralogy of non-silicates
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. 12 tables
N60°40'00" - N66°40'00", E29°19'60" - E37°55'00"
N60°00'00" - N70°00'00", E28°00'00" - E42°00'00"
Secondary Affiliation: University of Houston, USA, United StatesMcGill University, CAN, CanadaMcGill University, CAN, CanadaUniversity of Hamburg, DEU, Federal Republic of Germany
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
Update Code: 200713
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