Record details

    Detection of Chemical Change in Lacustrine Sediments by Non Invasive Magnetic Method
    Adachi, T.
    Kletetschka, Günther
    Mikula, V.
    Pruner, Petr
    Wasilewski, P.
    2006 Philadelphia Annual Meeting (22.10.2006-25.10.2006 : Philadelphia, Spojené státy americké)
Publication type
Source title - monograph
    2006 Philadelphia Annual Meeting. Abstracts with Programs
    s. 200-200
    Překlad názvu: Detekce chemické změny v jezerních sedimentech pomocí neinvazivní magnetické metody
    Rozsah: 1 s.
    Výzkumný záměr: CEZ:AV0Z30130516
Subject category
    chemical remanence
    lake sediment
    natural remanence
Abstract (in english)
   Lake sediments contain a magnetic record that is composed of induced and remanent magnetic carriers. Most of the recent environmental research uses induced magnetic properties (e.g. susceptibility) to indicate the paleo-environmental record of the sediment. Climatic changes can induce chemical precipitation of the existing sediment that involves re-crystallization of iron oxides. We suggest that this chemical change can be detected by analysis of the efficiency of magnetic remanence - REM (Remanent Efficiency of Magnetization = Natural Remanent Magnetization normalized by Saturation Remanent Magnetization). This ratio is very specific to the mode of formation of new magnetic phase within the sediment. When the sedimentary magnetic grains acquire chemical remanent magnetization (CRM) by increasing its volume (it passes through the "blocking volume" for which magnetic minerals block magnetic remanence induced by geomagnetic field) the efficiency of this process is 1-2%.
    AV ČR Brno, Geologický ústav
Contributor code
    AV ČR, GLÚ
Source format
Import date
    8. 8. 2012