Record details

Title
    Rapid exhumation of medium to high-pressure metamorphic rocks at the saxothuringian-Moldanubian boundary : Evidence from detrial white micas in Saxothuringian synorogenic sediments (E-Variscides, Germany)
Statement of responsibility
    Jürgen Schäfer
Author
    Schäfer, Jürgen
Language
    anglicky
Source title - serial
    Neues Jahrbuch für Geologie und Paläontologie. Abhandlungen
Vol./nr.
    Vol. 206, no. 3
Pages
    p. 343-364
Year
    1997
Notes
    5 obr., 4 tab., 4 s.bibl.
    Zkr. název ser.: Neu. Jb. Geol. Paläont., Abh.
Subject group
    devon-svrchní
    horniny klastické
    karbon-spodní
    krystalochemie
    křemík
    metamorfóza vysokotlaká
    oblast snosová
    rychlost eroze
    slídy
    vrásnění variské
Subject category
    bohemikum
    exhumace
    moldanubikum
    saxothuringikum
Geographical name
    ČR-Čechy
    SRN
Keyword
    Boundary
    Detrial
    E-Variscides
    Evidence
    Exhumation
    Germany
    High-pressure
    Medium
    Metamorphic
    Micas
    Rapid
    Rocks
    Saxothuringian
    Saxothuringian-Moldanubian
    Sediments
    Synorogenic
    White
Abstract (in english)
   The oldest Saxothuringian synorogenic greywackes preserved (Famennian) contain detrial white micas with a strongly varying spectrum of Si-contents (3..06-3.45 Si/f.u.). This is explained by erosion of units of different metamorphic grade, including high-pressure metamorphic rocks, which are indicated by the partly very high Si-contents (up to 3.45 Si/f.u.). The range of Si-contents remains unchanged throughout the complete synorogenic sedimentary sequence (Famennian to Visean). Including results of previous work upon the composition of the synorogenic sediments, as well as K-Ar data of the detrial white micas, the variscan front of the Tepla-Barrandian terrane, together with its crystalline hinterland, can be regarded as the provenance area of the synorogenic sediments. A very narrow time span between HP-metamorphism (ca.
   390 Ma) and sedimentation of the HP-detrius at 370 Ma indicates rapid exhumation of high-pressure metamorphic rocks at the Saxothuringian-Moldanubian boundary, for which a minimum exhumation rate of 3 mm/ can be estimated
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    21. 2. 2008
Import date
    8. 8. 2012