Record details

Title
    Magnetic characterization of Fe-Oxides concretions from Utah, USA and Czech Republic as terrestrial analogues of Mars
Author
    Adachi, T.
    Adamovič, Jiří
    Kletetschka, Günther
Conference
    Japan Geoscience Union Meeting 2008 (25.05.2008-30.05.2008 : Chiba, Japonsko)
Language
    anglicky
Publication type
    abstrakt
Source title - monograph
    Japan Geoscience Union Meeting 2008
Pages
    E111-006-E111-006
Notes
    Překlad názvu: Magnetická charakteristika železitých oxidů z Utahu, USA a České republiky jako zemské analogie Marsu
    Rozsah: 1 s. : CD-ROM
    Výzkumný záměr: CEZ:AV0Z30130516
Subject category
    concretions
    goethite
    hematite
    Mars
    rock magnetism
Keyword
    Analogues
    Characterization
    Concretions
    Czech
    Fe-Oxides
    Magnetic
    Mars
    Republic
    Terrestrial
    USA
    Utah
Abstract (in english)
   Terrestrial Fe-oxides (e.g., hematite, goethite, and magnetite) concretions were formed in aqueous diagenetic conditions in sandstones. Magnetism of these concretions from the Jurassic Navajo sandstone, Utah, and from Cretaceous sandstones in Czech Republic were partly characterized, and interpreted for the compositions of hematite, goethite and magnetite with respect to their grain sizes.At ambient temperature they are the mixtures of superparamagnetic (SP), single domain (SD), and multidomain (MD) magnetic states. For the magnetic signature interpretation, we also collected Navajo sandstone samples that contain primarily goethite or hematite cement and used them as a standard. Concretions from Utah are not capable of reaching saturation magnetization (SIRM), even when using pulse magnetic fields exceeding 10 Tesla. We observed a linear trend during the room-temperature, high-field magnetic acquisition that we interpret as goethite signature.
Contributor
    AV ČR Brno, Geologický ústav
Contributor code
    AV ČR, GLÚ
Source format
    U
Import date
    8. 8. 2012