Estudio paleomagnético preliminar de diques mesozoicos del Alto Atlascontrol térmico en la generación de pirrotina en calizas remagnetizadas con magnetita

  1. J.J. Villalaín 1
  2. V.C. Ruiz 2
  3. S. Torres-López 1
  4. A. Casas-Sainz 3
  5. B. Moussaid 4
  6. P. Calvín 1
  1. 1 Universidad de Burgos
    info

    Universidad de Burgos

    Burgos, España

    ROR https://ror.org/049da5t36

  2. 2 Universidad Complutense de Madrid
    info

    Universidad Complutense de Madrid

    Madrid, España

    ROR 02p0gd045

  3. 3 Universidad de Zaragoza
    info

    Universidad de Zaragoza

    Zaragoza, España

    ROR https://ror.org/012a91z28

  4. 4 Université Hassan II
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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: 901-904

Tipo: Artículo

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Otras publicaciones en: Geotemas (Madrid)

Resumen

The Jurassic limestones of the Central High Atlas are intruded by Upper Jurassic dykes and plutonic bodies. The limestone host rocks have undergone a widespread and pervasive normal polarity remagnetization carried by magnetite which has been dated as 100 Ma. In order to study the magnetic mineralogical changes due to the thermal impact of a dike in the remagnetized limestones, a detailed rock magnetic and paleomagnetic study has been performed in these dikes. A clear signal of pyrrhotite has been observed by different rock-magnetic analysis in the 1-2 meters of host-rocks closest to the dike. The NRM also shows a pyrrhotite paleomagnetic component with reversed polarity coexisting with the remagnetization carried by magnetite. A gradient of pyrrhotite content has been observed in the host-rock indicating a thermal control on pyrrhotite development. A discussion about the thermal effect on the chemical transformation involving magnetite and pyrrhotite in sedimentary rocks is presented.

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