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GEOREF RECORD

Euhedral crystals of ferroan platinum, cooperite and mertieite-II from alluvial sediments of the Darya river, Aldan Shield, Russia

G. G. Shcheka, A. N. Solianik, B. Lehmann, A. Bieniok, G. Amthauer, D. Topa and J. H. G. LaFlamme
Euhedral crystals of ferroan platinum, cooperite and mertieite-II from alluvial sediments of the Darya river, Aldan Shield, Russia
Mineralogical Magazine (December 2004) 68 (6): 871-885

Abstract

Idiomorphic crystals (up to 3.5 mm) of ferroan platinum, cooperite and mertieite-II were found in a heavy-mineral concentrate from stream sediments of the Darya river in the Aldan Shield, Russia. Pt-Fe crystals display cubic and thin platy habits; occasionally they are twinned. The chemical composition ranges from Pt (sub 2.64) Fe (sub 1.00) to Pt (sub 2.88) Fe (sub 1.00) with Os, Ru, Ir, Rh and Pd below the analytical detection limit of the electron microprobe. X-ray diffractometry of Pt-Fe crystals suggests a F-centred cubic lattice, characteristic of ferroan platinum. Some of the ferroan platinum crystals have large (about 100 mu m wide) cooperite overgrowth rims or are covered by a Au-Ag alloy. Cooperite also occurs as large euhedral crystals (up to 3 mm across, partly twinned). Crystals of mertieite-II are speckled with mu m-sized (2-5 mu m) inclusions of sperrylite and intergrown with minerals of cooperite-braggite solid solution, Pt-Pd-Hg alloy, keithconnite and Au-Ag alloy. Fractures along crystallographic planes of the mertieite-II crystals are filled with Pd-Pt-Fe-Sb-As-Hg-Te-Bi-bearing oxides. The coarse-grained PGM from the Darya have a geological setting similar to the Kondyor PGE placer 75 km to the northeast and are probably related to clinopyroxenite-hornblende-magnetite units of Alaskan-/Uralian-type intrusions.


ISSN: 0026-461X
EISSN: 1471-8022
Coden: MNLMBB
Serial Title: Mineralogical Magazine
Serial Volume: 68
Serial Issue: 6
Title: Euhedral crystals of ferroan platinum, cooperite and mertieite-II from alluvial sediments of the Darya river, Aldan Shield, Russia
Affiliation: Russian Academy of Sciences, Far East Geological Institute, Vladivostok, Russian Federation
Pages: 871-885
Published: 200412
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 20
Accession Number: 2005-023612
Categories: Economic geology, geology of ore deposits
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 6 tables
N55°30'00" - N61°30'00", E116°30'00" - E137°00'00"
Secondary Affiliation: Technical University of Clausthal, DEU, Federal Republic of GermanyUniversity of Salzburg, AUT, AustriaCanada Centre for Mineral and Energy Technology, CAN, Canada
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200512
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