Magnetobiostratigraphic dating and environmental magnetism of Late Neogene marine sediments recovered at the Huelva-1 and Montemayor-1 boreholes (lower Guadalquivir basin, Spain)

  1. Juan C. Larrasoaña 1
  2. José Ángel González Delgado 2
  3. Jorge Civis Llovera 2
  4. Francisco Javier Sierro Sánchez 2
  5. Gaspar Alonso Gavilán 2
  6. J. Pais 3
  1. 1 Instituto de Ciencias de la Tierra Jaume Almera
    info
    Instituto de Ciencias de la Tierra Jaume Almera

    Barcelona, España

    ROR https://ror.org/01nsd7y51

    Geographic location of the organization Instituto de Ciencias de la Tierra Jaume Almera
  2. 2 Universidad de Salamanca
    info
    Universidad de Salamanca

    Salamanca, España

    ROR https://ror.org/02f40zc51

    Geographic location of the organization Universidad de Salamanca
  3. 3 Universidade Nova de Lisboa
    info
    Universidade Nova de Lisboa

    Lisboa, Portugal

    ROR https://ror.org/02xankh89

    Geographic location of the organization Universidade Nova de Lisboa
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Journal:
Geotemas (Madrid)

ISSN: 1576-5172

Year of publication: 2008

Issue Title: VII Congreso Geológico de España

Issue: 10

Pages: 1175-1178

Type: Article

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Abstract

Here we present a magnetobiostratigraphic and environmental magnetic study of the marine sediments that constitute the Neogene filling of the lower Guadalquivir Basin, which were recovered in the Huelva-1 and Montemayor-1 boreholes. Our results indicate that that the Huelva-1 borehole is continuous and spans from the latest Tortonian (C3Br.2r, ca. 7.4 Ma) to the latest Messinian (uppermost C3r, ca. 5.4 Ma). The Montemayor-1 borehole spans from the latest Tortonian (C3Br.2r, ca. 7.4 Ma) to the lower Pliocene (Zanclean, C3r/C2Ar boundary, ca. 4.3-4.2 Ma), being the Miocene record continuous but having the lower Pliocene record a discontinuous nature. In both boreholes, we have observed a sharp decrease in magnetization intensity in lowermost part of chron C3r (ca. 5.9 Ma). This sharp decrease is attributed to a marked increase in accumulation rates, which might be linked to the important paleogeographic changes undergone in the Betic domain at the onset of the Messinian salinity crisis.

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