Registro de transiciones de polaridad en coladas volcánicas pliocenas de la meseta de Djavakheti (Cáucaso menor): El caso de la secuencia de Apnia

  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
  6. A. Carrancho 1
  7. J.J. Villalaín 1
  8. A. Caccavari 2
  9. M. Devidze 3
  10. C. Principe 5
  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

  5. 5 Istituto di Geoscienze e Georisorse-CNR, Archaeomagnetic laboratory Villa Borbone, Viareggio, Italy
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Journal:
Latinmag Letters

ISSN: 2007-9656

Year of publication: 2016

Volume: 6

Issue: B31

Pages: 1-6

Type: Article

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More publications in: Latinmag Letters

Abstract

Paleomagnetism and rock magnetism experiments were carried out on the Pliocene Apnia sequence. Thissequence consists of basaltic flows with K-Ar ages between 3.70 ±0.20 and 3.09 ±0.10 Ma, and is locatedin the western Djavakheti Highland, one of the most important volcanic regions of the Lesser Caucasus.Previous paleomagnetic studies on different sequences of the same region show that these materials offera reliable and continuous record of changes in the Earth’s magnetic field, both in direction and intensity.Rock magnetism suggests magnetite with different contents of titanium and a mixture of single-domainand multidomain grains as carriers of magnetization. Paleomagnetic measurements show 5 normal, 2transitional and 13 reverse polarity flows. The average pole obtained for the normal-polarity flows yieldsλ = 72°, φ = 319°, and for the reverse-polarity ones λ = 75°, φ = 126°. Mean directions of normal and reversepolarity-flows are not antipodal and do not agree with the expected directions, the normal polarity groupshows the greater disagreement. Scatter of virtual geomagnetic poles (VGPs) shows a value SB = 23.77 fornormal polarity flows, and SB = 19.52 for reverse polarity flows, well above the expected value.