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Title: Palaoenvironmental conditions during Pliocene and Pleistocene in the Southwest Iberian Margin: Ichnological analysis of sedimentary record from IODP Expedition 339
Authors: Dorador Rodríguez, Javier
Direction: Rodríguez-Tovar, Francisco J.
Collaborator: Universidad de Granada. Departamento de Estratigrafía y Paleontología
Issue Date: 2017
Submitted Date: 21-Mar-2017
Abstract: International Ocean Discovery Program Expedition 339 took place in the Gulf of Cadiz and the Western Iberian Margin during the end of 2011 and the beginning of 2012, aimed to arrive at a better understanding of Mediterranean Outflow Water evolution, to study the contourite deposits generated by this water mass, and to derive a marine reference climate section from the Pleistocene. Several disciplines are involved in the study of the drilled cores, ichnology being one of them due to its usefulness in palaeoenvironmental studies, providing information about parameters such as oxygen level, food supply or substrate consistency, and hence about the environmental changes involved (i.e., palaeoclimate, atmosphere/ocean dynamics, etc.). This PhD Thesis, based on ichnological analysis of the retrieved marine cores from the expedition, focuses on its use for palaeoenvironmental interpretations during the Pliocene and Pleistocene. Results regarding the ichnological content throughout the studied cores reveal that, in general, sediments were deposited under good oxygen levels and nutrient availability, although some intervals related with dysaerobic conditions can be also identified. More detailed and integrative studies allow for characterization of the palaeoenvironmental evolution during particular intervals, as those corresponding to Marine Isotope Stages 12 and 11, showing that changes in trace fossil features can be linked to surface productivity and food supply variations, and correlated to foraminifera information. This relation between ichnological attributes and productivity is also demonstrated by Zoophycos distribution during glacial-interglacial variations, which may even be used as a proxy, its presence associated with intermediate sedimentation rate and seasonal high productivity in Neogene hemipelagic deposits. All these advances prove the usefulness of ichnology in the study of modern marine cores, supporting the ichnological approach as a tool in drilling expeditions.
Sponsorship: Tesis Univ. Granada. Programa Oficial de Doctorado en: Ciencias de la Tierra
Universidad de Granada, Contrato Predoctoral FPU del Plan Propio de Investigación
Secretaría de Estado en I+D+I del Ministerio de Economía y Competitividad del Gobierno de España, en el marco de los Proyectos CGL2012-33281 y CGL2015-66835-P
Consejería de Economía, Innovación, Ciencia y Empleo de la Junta de Andalucía mediante el Proyecto RNM-3715 y el Grupo de Investigación RNM-178
Sociedad Española de Paleontología, por la Ayuda a la Investigación (ref. 007) concedida en el marco de las Ayudas de Investigación de la SEP
Publisher: Universidad de Granada
Keywords: International Ocean Discovery Program (IODP)
Mediterráneo
Evolución
Geología estructural
Paleontología
Icnología
Sedimentos marinos
Pleistoceno
Plioceno
Paleobiología
UDC: 55
551.5
(043.2)
2506
URI: http://hdl.handle.net/10481/46536
ISBN: 9788491632108
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Dorador Rodríguez, J. Palaoenvironmental conditions during pliocene and pleistocene in the southwest iberian margin: Ichnological analysis of sedimentary record from iodp expedition 339. Granada: Universidad de Granada, 2017. [http://hdl.handle.net/10481/46536]
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