Registro de una transición de polaridad en una secuencia de lavas Neógena en la isla de la Gomera, Islas Canarias

  1. Ana Caccavari 1
  2. Manuel Calvo Rathert 2
  3. Avto Gogichaishvili 12
  4. Vicente Soler 3
  5. He Huaiyu 4
  6. Néstor Vegas 5
  7. Bertha Aguilar 1
  1. 1 Universidad Nacional Autónoma de México
    info

    Universidad Nacional Autónoma de México

    Ciudad de México, México

    ROR https://ror.org/01tmp8f25

  2. 2 Universidad de Burgos
    info

    Universidad de Burgos

    Burgos, España

    ROR https://ror.org/049da5t36

  3. 3 Estación Volcanológica de Canarias
  4. 4 Chinese Academy of Sciences
    info

    Chinese Academy of Sciences

    Pekín, China

    ROR https://ror.org/034t30j35

  5. 5 Universidad del País Vasco/Euskal Herriko Unibertsitatea
    info

    Universidad del País Vasco/Euskal Herriko Unibertsitatea

    Lejona, España

    ROR https://ror.org/000xsnr85

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Journal:
Latinmag Letters

ISSN: 2007-9656

Year of publication: 2013

Volume: 3

Issue: PB13

Pages: 1-7

Type: Article

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More publications in: Latinmag Letters

Abstract

We present paleomagnetic and rock-magnetic results obtained on four Neogene lava flow sequencesfrom the island of la Gomera (Canary Islands, Spain). One of these flow sequences (Túnel de Hermigua)records a polarity transition already partially studied and dated (40 successive lava flows in the Túnel deHermigua sequence. Paleomagnetic yielded normal polarity directions in the 31.7 Ma) by Glen et al. (2003)As the transition was incompletely sampled and only reverse polarity directions recorded in flows overlyingtransitionally magnetized lavas were detected in that study, doubts arise whether a full polarity transition oran excursion.We sampled lower-lying flows of the sequence. These results prove that this sequence records a full N-Rpolarity transition. Overlying the 31 normal-polarity flows two transitional flows were found. At present,the 7 uppermost flows of the section are under analysis. In addition, new Ar-Ar datings are being performed.Rock-magnetic studies were carried out to find out the carriers of remanence and their stability. Analysisof thermomagnetic curves allows distinguishing titanomagnetite with varying content of titanium as themain carrier of remanence. Analysis of hysteresis parameters suggests that the grain size of most studiedsamples corresponds to a mixture of single-domain and multi-domain particles.