Record details

Title
    Arborescent palladiferous gold and empirical Au2Pd and Au3Pd in alluvium from southern Serra do Espinhaço, Brazil
Other titles
    Stromovité palladiové zlato a fáze Au2Pd a Au3Pd v aluviích z jižní Serra do Espinhaço, Brazílie
Author
    Cabral, Alexandre
    Kwitko-Ribeiro, R.
    Lehmann, B.
    Tupinambá, M.
    Vymazalová, Anna
Language
    anglicky
Publication type
    článek v periodiku
Source title - serial
    Neues Jahrbuch für Mineralogie. Abhandlungen
Vol./nr.
    Roč. 184, č. 3
Pages
    8
Year
    2008
Thesaurus term
    palladiferous gold, Au-Pd-Pt mineralisation, southern Serra do Espinhaço, Córrego Bom Sucesso, Minas Gerais, Brazil
Keyword
    Alluvium
    Arborescent
    Au2Pd
    Au3Pd
    Brazil
    Do
    Empirical
    Espinhaço
    Gold
    Palladiferous
    Serra
    Southern
Abstract (in czech)
   Stromovité palladiové zlato a fáze Au2Pd a Au3Pd v aluviích z jižní Serra do Espinhaço, Brazílie
Abstract (in english)
   Arborescent crystals of palladiferous gold are identifi ed for the fi rst time in platiniferous alluvium from Córrego Bom Sucesso, Serro region, in southern Serra do Espinhaço, Minas Gerais, Brazil. The Córrego Bom Sucesso alluvium is regarded as the type locality of Pd, being also famous for dendritic Pt-Pd-Hg nuggets. Gold composition ranges from 66.5 to 95.4 at % Au (77.6-97.9 wt % Au) and from 4.4 to 29.8 at % Pd (2.4-18.8 wt % Pd), with trace amounts of Ag. Two near-stoichiometric alloys, Au2Pd and Au3Pd, determined by electron-microprobe analysis, may correspond to unnamed mineral phases. The arborescent crystals of palladiferous gold are well preserved and as delicate as the arborescent Pt-Pd-Hg alloys in the alluvium, thereby suggesting that they all formed under the same oxidising low-temperature conditions.
Contributor
    Česká geologická služba
Contributor code
    ČGS (RIV)
Source format
    R
Import date
    15. 10. 2014