Record details

Title
    Geochemistry and mineralogy of Platinum-group elements in the Ransko gabbro-peridotite massif, Bohemian Massif (Czech Republic)
Statement of responsibility
    Jan Pašava, Ivan Vavřín, Jiří Frýda, Vojtěch Janoušek, Emil Jelínek
Author
    Frýda, Jiří
    Janoušek, Vojtěch, 1968-
    Jelínek, Emil, 1943-
    Pašava, Jan
    Vavřín, Ivan
Language
    anglicky
Source title - serial
    Mineralium Deposita
Vol./nr.
    Vol. 38, no. 3
Pages
    p. 298-311
Year
    2003
Notes
    13 obr., 5 tab., 2 s. bibl.
    il.
    Zkr. název ser.: Mineralium Depos. (Berlin).
Subject group
    asociace minerální
    chemismus hornin
    datování S34/S32
    datování Sm/Nd
    gabro
    intruze
    kovy skupiny platiny
    peridotit
    rudy Cu
    rudy Ni
    železnohorské krystalinikum
Geographical name
    ČR-Čechy
    Staré Ransko (Havlíčkův Brod)
Keyword
    Bohemian
    Czech
    Elements
    Gabbro-peridotite
    Geochemistry
    Massif
    Mineralogy
    Platinum-group
    Ransko
    Republic
Abstract (in english)
   The Ransko gabbro-peridotite massif in Eastern Bohemia is a strongly differentiated intrusive complex of Lower Cambrian age. The complex hosts low grade Ni-Cu ores mainly developed close to the contact of olivine-rich rocks with gabbros, in troctolites and, to a much lesser extent, in both pyroxene and olivine gabbros and plagioclase-rich peridotites. The ore zone is characterized by strong serpentinization and uralitization. The total Ni + Cu locally reaches up to 4 wt per cent. Anomalous concentrations of platinum-group elements (PGE's) (maximum 532 ppb Pd, 182 ppb Pt, 53 ppb Rh, 15 ppb Ru, 41 ppb Ir) were detected in samples of Cu-Ni and Ni-Cu ores (maximum 2.63 wt per cent Ni and 2.31 wt per cent Cu) from the Jezírka orebody. The main ore paragenesis includes pyrrhotite, pentlandite, chalcopyrite, cubanite, pyrite, magnetite, mackinawite, valleriite, ilmenite and sphalerite.
   During this work, michenerite, froodite, sperrylite, gold, native bismuth, altaite, tsumoite, hessite, an unnamed Bi-Ni telluride, cobaltite-gersdorffite and galena were newly identified. The host rocks originated through partial melting of a slightly depleted mantle source with noble metals scavenged from this primitive magma prior to the development of these rocks
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    31. 8. 2007
Import date
    8. 8. 2012