Podrobnosti záznamu

Název
    Precise electron microprobe age determination in altered uraninite: consequences on the intrusion age and the metallogenic significance of the Kirchberg granite (Erzgebirge, Germany)
Údaj o odpovědnosti
    Ulf Kempe
Autor
    Kempe, Ulf
Jazyk
    anglicky
Zdrojový dokument - seriál
    Contributions to mineralogy and petrology
Svazek/č.
    Vol. 145, no. 1
Strany
    p. 107-118
Rok
    2003
Poznámky
    4 obr., 4 fot., 1 tab., 3 s. bibl.
    il.
    Zkr. název ser.: Contr. Mineral. Petrology
Předmětová skupina
    datování U/Th/Pb
    granitoidy
    hydrotermální alterace
    krušnohorský pluton
    metalogeneze
    olovo
    rudy U
    rudy W
    uran
    uraninit
    vrásnění variské
Geografické jméno
    ČR-Čechy
    Jáchymov (Karlovy Vary)
    SRN-Sachsen
Klíčové slovo
    Age
    Altered
    Consequences
    Determination
    Electron
    Erzgebirge
    Germany
    Granite
    Intrusion
    Kirchberg
    Metallogenic
    Microprobe
    Precise
    Significance
    Uraninite
Abstrakt (anglicky)
   An integral method of data evaluation for chemical dating of accessory uraninite by electron microprobe analysis and electron microscopy is proposed. The internal structure of uraninite grains, the contents of Si, Ca, and Fe, and tests for loss or gain of Pb and U are suitable criteria to decide whether or not a given crystal area was affected by secondary alteration. The method was applied to uraninite from the Kirchberg granite, Erzgebirge, Germany, and an age of 330?5 Ma (?2delta) was constrained. This result supports earlier assumptions that there were at least two events of Hercynian granite magmatism separated by a time gap of about 40 Ma, and that the magmatic evolution of the Kirchberg granite is not related to the formation of the W mineralisation developed in the endocontact of this granite. Secondary alteration of uraninite is probably closely related to the formation of U deposits in the vicinity of the Kirchberg massif which was extensively mined in the past
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
    U
Datum vložení
    24. 10. 2007
Datum importu
    8. 8. 2012