Determinación de paleointensidades absolutas registradas durante etapas de inestabilidad del campo magnético terrestre en rocas volcánicas plio-pleistocenas de la meseta de Djavakheti(sur de Georgia)

  1. E.M. Sánchez-Moreno 1
  2. M. Calvo-Rathert 1
  3. A. Gogichaishvili 2
  4. G.T. Vashakidze 3
  5. V.A. Lebedev 4
  1. 1 Universidad de Burgos
    info

    Universidad de Burgos

    Burgos, España

    ROR https://ror.org/049da5t36

  2. 2 Universidad Nacional Autónoma de México
    info

    Universidad Nacional Autónoma de México

    Ciudad de México, México

    ROR https://ror.org/01tmp8f25

  3. 3 Tbilisi State University
    info

    Tbilisi State University

    Tiflis, Georgia

    ROR https://ror.org/05fd1hd85

  4. 4 Institute of Geology of Ore Deposits Petrography Mineralogy and Geochemistry
    info

    Institute of Geology of Ore Deposits Petrography Mineralogy and Geochemistry

    Moscú, Rusia

    ROR https://ror.org/054xffa50

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Revista:
Geotemas (Madrid)

ISSN: 1576-5172

Año de publicación: 2016

Título del ejemplar: IX CONGRESO GEOLÓGICO DE ESPAÑA

Número: 16

Páginas: 889-892

Tipo: Artículo

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Otras publicaciones en: Geotemas (Madrid)

Resumen

The Djavakheti Highland Plio-Pleistocene volcanism is characterized by the emission of large consecutive thin lava flow sequences. These features combined with available K-Ar dates (Lebedev et al., 2008 and 2014 pers. comm.), can provide a reliable record for the study of the Earth’s Magnetic Field (EMF). The present study was performed on two different basaltic sequences. Paleomagnetic measurements yielded a characteristic component in all flows displaying normal, reverse and intermediate polarities. Calculated mean paleomagnetic directions and virtual geomagnetic poles (VGPs) show a significant deviation from the expected poles (Besse & Courtillot, 2002).In addition, the angular scatter of virtual geomagnetic poles (VGP) study shows clearly disagreement with the Model G proposed by McFadden et al., (1988) fit to paleosecular variation on lavas for the last 5 Myr data of McElhinny and McFadden (1997) and Johnson (2008). This is an ideal context for performing paleointensity determinations recording an unstable behaviour of the EMF. Paleointensity determinationswere carried out with Thellier and Thellier (1959) method and the results obtained show lower values thanthose found by other authors in sequences of the same characteristics.

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