Estudio paleomagnético y de paleointensidad en coladas pliocenas del Cáucaso Menor(Georgia)

  1. M. Calvo Rathert 1
  2. M.F. Bógalo Román 1
  3. A. Gogichaishvili 2
  4. J. Sologashvili 3
  5. G. Vashakidze 4
  1. 1 Universidad de Burgos
    info

    Universidad de Burgos

    Burgos, España

    ROR https://ror.org/049da5t36

  2. 2 Laboratorio Interinstitucional de Magnetismo Natural, UNAM
  3. 3 Caucasus International University
    info

    Caucasus International University

    Tiflis, Georgia

    ROR https://ror.org/00atp1s12

  4. 4 Alexandre Janelidze Institute of Geology
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Revue:
Geotemas (Madrid)

ISSN: 1576-5172

Année de publication: 2012

Titre de la publication: VIII Congreso Geológico de España, Oviedo, 17-19 de julio, 2012.

Número: 13

Pages: 1132-1135

Type: Article

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D'autres publications dans: Geotemas (Madrid)

Résumé

A paleomagnetic, rock-magnetic and paleointensity study has been carried out on 16 flows from the Djavakheti Highland (Lesser Caucasus, Georgia). Measurement of magnetization versus temperature curves allowed distinguishing three types of thermomagnetic curves: (i) Reversible curves with magnetite as only carrier of remanence (type H); (ii) curves similar to the former, but irreversible (type H− ) and (iii) irreversible curves containing a low Curie-temperature phase and magnetite. Analysis of hysteresis curve parameters showed the presence of magnetic grains characterised by pseudo-single-domain structure, which might be interpreted in terms of a mixture of single-domain and multi-domain grains. Paleomagnetic experiments allowed determining characteristic components for all flows. A normal polarity was observed in 7 cases, a reversed polarity in 8 cases and an intermediate polarity in flow AP2. Paleointensity experiments with the Coe method were performed on 31 specimens from 12 flows. After application of selection criteria, only 16 samples from 5 flows were observed to provide reliable results, with mean values varying between 24.1 and 54.3 µT.

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