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Synthesis of platinum-group minerals under hydrothermal conditions

Tatiana Evstigneeva and Mahmud Tarkian
Synthesis of platinum-group minerals under hydrothermal conditions
European Journal of Mineralogy (June 1996) 8 (3): 549-564


Experiments are reported using Cl-, Na-, K-, As-, Sn-, Bi-, Pb-, Te-bearing solutions at 240-500 degrees C in the synthesis of PGM to study their behaviour under hydrothermal conditions. Metallic Pt, Pd, PtAs (sub 2) , Pt(As,Sn) (sub 2) and PdPb ('Pb-polarite') were synthesized directly from hydrothermal solutions in the presence of graphite as reducing component. Phase transformations were noted for some pre-synthesized Pd compounds: Pd bismuthides replace PdS in Cl-Sb-Bi-bearing solutions, but no Pt-Sb or Pt-Bi phases crystallized under these conditions. Recrystallization of Pt- and Pd-sulphides in slightly acidic solutions with Sb- or Bi-chlorides at 240 degrees C yielded complex multiphase associations including Sb (sub 2) S (sub 3) , BiSb (sub 3) and Bi (sub 2) S (sub 3) without involving Pt in the reactions; however, froodite (PdBi (sub 2) ) was obtained by recrystallization of PdS + Fe (sub 0.88) S + FeS (sub 2) assemblages in BiCl (sub 3) solution at 240 degrees C. The distribution of the PGE under hydrothermal conditions at controlled fS (sub 2) shows that PtS is stable at logfS (sub 2) >><$I> -3.4 and (Pt,Fe) is very poor in Fe at logfS (sub 2) <<<$I> -6.5 (at 562 degrees C). Experimental results for Pt/Pd and Ir-bearing sulphides are in good agreement with observations on natural deposits.

ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 8
Serial Issue: 3
Title: Synthesis of platinum-group minerals under hydrothermal conditions
Affiliation: Russian Academy of Sciences, Institute of Geology of Ore Deposits, Mineralogy, Petrology and Geochemistry, Moscow, Russian Federation
Pages: 549-564
Published: 199606
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 24
Accession Number: 1996-047203
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: 13 tables
Secondary Affiliation: University of Hamburg, DEU, Federal Republic of Germany
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199616
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