Počet záznamů: 1  

Contrasting Nature of Magnetic Anomalies over Thin Sections Made out of Barrandien’s Basaltic Rocks Points to their Origin

  1. 1.
    0379702 - GLU-S 2013 SK eng A - Abstrakt
    Kletetschka, Günther - Pruner, Petr - Schnabl, Petr - Šifnerová, Kristýna
    Contrasting Nature of Magnetic Anomalies over Thin Sections Made out of Barrandien’s Basaltic Rocks Points to their Origin.
    Contributions to Geophysics & Geodesy. -, special issue (2012), s. 69-70. ISSN 1335-2806.
    [Castle meeting New Trends in Geomagnetism : Paleo, rock and environmental magnetism/13./. 17.06.2012-23.06.2012, Zvolen]
    Grant CEP: GA ČR GAP210/10/2351
    Institucionální podpora: RVO:67985831
    Klíčová slova: magnetic anomalies * thin sections * volcanic rocks
    Kód oboru RIV: DE - Zemský magnetismus, geodézie, geografie
    http://gauss.savba.sk/GPIweb/conferences/Castle2012/abstrCastle.pdf

    Magnetic anomalies were obtained over the thin sections of basaltic rocks of Silurian age sampled at various locations of the Prague Basin. Magnetic scans were acquired from volcano-sedimentary sequence (Telychian–Gorstian), namely at three localities; Cernidla (Wenlock), Listice roadcut (early Ludlow), and Listice quarry (latest Llandovery). The paleomagnetism of these rocks revealed two contrasting components of remanent magnetization in the same temperature or AF demagnetization ranges with different directions and paleolatitudes. Two preliminary results can be drawn: 1) Fitting the Silurian directions (D=178°, I=-37°) resulted of paleorotation of 160-175º and paleolatitudes 20–24° S; 2) The magnetization of Silurian volcanic rocks of the Prague Basin may represent Permian to Triassic overprint. The micro-magnetic anomaly distribution over the sampled surfaces revealed relationship with the origin of magnetic phases. Namely, magnetic scans suggested three magnetic characters: (1) Localized magnetic anomalies (2) Magnetic texture related to the formation of vesicles (3) Magnetic texture that relates to the massive basaltic matrix. Analysis of the constructed magnetic maps along with their paleomagnetic character, optical-reflected and transmitted microscopy revealed the primary sources of the paleomagnetic signal.
    Trvalý link: http://hdl.handle.net/11104/0210594