El registro del Evento Anóxico Oceánico del Aptiense inferior (OAE 1a) en la sección de Carbonero (Subbético, sur de España)estratigrafía de isótopos de carbono, biomarcadores y composición elemental
- J.M. Castro 1
- S. Froehner 2
- R. Aguado 1
- G.A. de Gea 1
- M.L. Quijano 1
- B.D.A. Naafs 3
- R.D. Pancost 3
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1
Universidad de Jaén
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2
Universidade Federal de Santa Catarina
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3
University of Bristol
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ISSN: 1576-5172
Year of publication: 2016
Issue Title: IX CONGRESO GEOLÓGICO DE ESPAÑA
Issue: 16
Pages: 201-204
Type: Article
More publications in: Geotemas (Madrid)
Abstract
The early Aptian Oceanic Anoxic Event (OAE 1a) represents a major perturbation in the global carbon cycle and is linked to environmental, biotic and sedimentary changes. The signature of this event is a global positive 13C excursion, associated with widespread deposition of organic-rich marine sediments. This study presents the stratigrahic and geochemical characterization of an expanded pelagic marine section from the western Tethys. A multiproxy approach, including C-isotope stratigraphy, biomarkers and elemental geochemistry has been carried out. Our results reveal that the previously defined C-isotope segments 2 to 7 are clearly recorded in the studied section. The biomarker study has revealed that organic matter is thermally mature, mainly composed of marine organic matter. The biomarker association along with redox-sensitive trace elements suggest that sedimentation took place under generally well oxygenated waters only punctuated by short episodes of anoxia/dysoxia in a general context of increased primary marine productivity. Our results suggest that a high primary productivity was the main control on the deposition of organic-rich sediments during OEA 1a in the studied section.