Sea-level dynamics and palaeoecological factors affecting trace fossil distribution in Eocene turbiditic deposits (Gorrondatxe section,N Spain) |
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| Authors: | Francisco J. Rodríguez-Tovar Alfred Uchman Aitor Payros Xabier Orue-Etxebarria Estibaliz Apellaniz Eustoquio Molina |
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| Affiliation: | 1. Instituto de Estudios Andinos Don Pablo Groeber (IDEAN), UBA-CONICET. Dpto. de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón II. Av. Intendente Güiraldes 2160, C1428EGA Buenos Aires, Argentina;2. Dpto. de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón II. Av. Intendente Güiraldes 2160, C1428EGA Buenos Aires, Argentina;1. Università di Milano, Dipartimento di Scienze della Terra, 20133-Milano, Italy;2. UNESCO Geopark Meseta Meridional, Geology and Paleontology Office, 6060-101-Idanha-a-Nova, Portugal;1. Université de Tunis El Manar, Faculté des Sciences de Tunis, 11 ES 15, Département de Géologie, 2092, Tunis, Tunisia;2. Institute of Petroleum Engineering, Heriot-Watt University, Edinburgh EH14 4 AS, Scotland, UK;3. Institute of Geological Sciences, Jagiellonian University, Oleandry 2a, 30-063 Kraków, Poland;1. Institute of Geological Sciences, Jagiellonian University, Oleandry 2a, 30-063 Kraków, Poland;2. Departamento de Estratigrafía y Paleontología, Universidad de Granada, 18002 Granada, Spain;1. Departamento de Estratigrafía y Paleontología, Universidad de Granada, 18002 Granada, Spain;2. Dept. Earth Sciences, Royal Holloway Univ. London, Egham, Surrey TW20 0EX, UK;3. Institut für Geographie und Geologie, Universität Greifswald, D-17487 Greifswald, Germany;4. Instituto Geológico y Minero de España, 28003 Madrid, Spain;5. Heriot-Watt University, Edinburg, Edinburgh EH14 4AS, Scotland, UK |
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| Abstract: | ![]()
Ichnological analysis of the upper Ypresian–lower Lutetian interval at the Gorrondatxe section (W Pyrenees, N Spain), reveals a relationship between sea-level dynamics and the eco-sedimentary factors influencing trace fossil assemblages. The 600 m thick section of deep-sea turbiditic deposits contains 41 ichnospecies belonging to 28 ichnogenera, which are typical of the Nereites ichnofacies, and mostly of the Paleodictyon ichnosubfacies, suggesting deposition in a basin plain to fan-fringe setting. The trace fossil diversity and abundance fluctuate, irrespective of turbidite frequency. These ichnological features are strongly affected by trophic level changes related partly to sea-level dynamics according to the sequence stratigraphic interpretations for the studied section. Temperature, oxygenation and substrate changes are also considered as relevant factors. Increased ichnodiversity, particularly among graphoglyptids, coincides with moderate oligotrophy and stable ecological conditions. Eutrophisation, lowered oxygenation and drop of temperature, typical of low sea level, can reduce ichnodiversity. |
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