COMPOSITIONAL VARIATIONS IN OULANKAITE AND A NEW SERIES OF ARGENTOAN OULANKAITE FROM THE LUKKULAISVAARA LAYERED INTRUSION, NORTHERN RUSSIAN KARELIA
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dc.contributor.author | Barkov A.Y. | |
dc.contributor.author | Fleet M.E. | |
dc.contributor.author | Martin R.F. | |
dc.contributor.author | Tarkian M. | |
dc.date.accessioned | 2022-11-11T08:24:04Z | |
dc.date.available | 2022-11-11T08:24:04Z | |
dc.date.issued | 2004 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=14607780 | |
dc.identifier.citation | The Canadian Mineralogist, 2004, 42, 2, 439-453 | |
dc.identifier.issn | 0008-4476 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/39627 | |
dc.description.abstract | Oulankaite. a complex base- and precious-metal stannosulfotelluride from the Nadezhda deposit in the Lukkulaisvaara layered intrusion. northern Karelia, northwestern Russia, exhibits a considerable variation in composition. At the type locality, this unique species of platinum-group mineral (PGM) is associated with various base-metal sulfides and PGM in hydrothermally altered pods and stringers of coarse-grained to pegmatitic gabbronorite, located within a sill-like body of microgabbronorite. Covariations in contents 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 atoms per formula unit, apfu: Sigmaatoms = 14). On the basis of the new data. we suggest a revised generalized formula for oulankaite: (Pd,Pt)(5+x)(Cu,Fe,Ag)(4-x)SnTe2S2, with 0 less than or equal to x < 1. The formula of the Ag-dominant analogue of oulankaite is similar: (Pd,Pt)(5+x)(Ag,Cu,Fe)(4-x)SnTe2S2, with 0 less than or equal to x < 1. Two different mechanisms of substitution exist in argentoan oulankaite, Ag-for-Cu and Pd-for-(Cu+Ag), whereas the composition of Ag-poor oulankaite is dominated by Pd-for-Cu substitution. Argentoan oulankaite ranges up to (Pd5.31Pt0.17)(Sigma5.48)(Ag1.52Cu1.27Fe0.63)Sigma(3.42)Sn(1.03)Te(2.09)S(1.98), which is likely an unnamed species of PGM. Micro-inclusions of Cl-rich ferropargasite (up to 3.25 wt.% Cl) occur in argentoan oulankaite and Ag-poor oulankaite. 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, which is consistent with the Pd-(Pt)-Ag mineralization in the Nadezhda deposit. | |
dc.subject | oulankaite | |
dc.subject | solid solution | |
dc.subject | sulfotelluride | |
dc.subject | platinum-group elements | |
dc.subject | platinum-group minerals | |
dc.subject | layered intrusion | |
dc.subject | Lukkulaisvaara | |
dc.subject | Russian Karelia | |
dc.subject | Baltic Shield | |
dc.title | COMPOSITIONAL VARIATIONS IN OULANKAITE AND A NEW SERIES OF ARGENTOAN OULANKAITE FROM THE LUKKULAISVAARA LAYERED INTRUSION, NORTHERN RUSSIAN KARELIA | |
dc.type | Статья |
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