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    Por favor, use este identificador para citar o enlazar este ítem: http://hdl.handle.net/10259/6108

    Título
    Weak palaeointensity results over a Pliocene volcanic sequence from Lesser Caucasus (Georgia): transitional record or time averaged field?
    Autor
    Sánchez Moreno, Elisa MaríaAutoridad UBU Orcid
    Calvo Rathert, ManuelAutoridad UBU Orcid
    Goguitchaichvili, Avto
    Tauxe, Lisa .
    Vashakidze, George T.
    Lebedev, Vladimir A.
    Publicado en
    Geophysical Journal International. V. 220, n. 3, p. 1604–1618
    Editorial
    Oxford University Press
    Fecha de publicación
    2020-03
    ISSN
    1365-246X
    DOI
    10.1093/gji/ggz533
    Resumen
    A palaeointensity study has been carried out on a Pliocene sequence of 20 consecutive lava flows where previous directional results seem to reflect anomalous behaviour of the Earth’s magnetic field (EMF), which can be explained by a polarity transition record or non-averaged palaeosecular variation or both. Here, we perform a total of 55 palaeointensity determinations using the original Thellier–Thellier (TT) method and 100 with the IZZI method.We assess the performance of our selection criteria using a set of strict threshold values applied to a set of test data whose TRMs were acquired in known fields. Absolute palaeointensity determinations that passed our selection criteria were obtained on four specimens with the TT method and on 41 specimens with the IZZI method. Application of reliability criteria at a site level yielded palaeointensity results in 8 of 20 studied lava flows. We obtained median values of VADM between 28.9 and 45.6 ZAm2 for the reverse polarity lower Apnia section, while the normal polarity upper section displayed a single value of 54.6 ZAm2. The low palaeointensity values before a transitional direction lava flow and the higher value after it, suggest the common behaviour at the start of a polarity reversal and the recovery after it. However, an isolated record of a stable EMF, where the intensity is lower than the current for the same location (83.7 ZAm2), cannot be discarded. Consequently, this interpretation would support a weak time-averaged field.
    Palabras clave
    Palaeointensity
    Magnetic field variations through time
    Palaeomagnetism
    Materia
    Magnetismo
    Magnetism
    Geología
    Geology
    URI
    http://hdl.handle.net/10259/6108
    Versión del editor
    https://doi.org/10.1093/gji/ggz533
    Aparece en las colecciones
    • Artículos PALEOMAG-UBU
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    Nombre:
    Sanchez-gji_2020.pdf
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    4.395Mb
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