RT Journal Article
T1 Foraminíferos del tránsito Cenomaniense-Turoniense en la sección de El Chorro, Cordillera Bética, sur de España
T1 Foraminifera across the Cenomanian-Turonian transition at the «El Chorro» section, Betic Cordillera,southern Spain
A1 Sánchez Quiñónez, Carlos Alberto
A1 Alegret, Laia
A1 Aguado, Roque
A1 Delgado Huertas, Antonio
A1 Cruz Larrasoaña, Juan
A1 Martín Algarra, Agustín
A1 O´Dogherty, Luis
A1 Molina, Eustoquio
AB A climatic, geological and biological global event resulted in sedimentation of black shales at theCenomanian/Turonian (C/T) boundary, coinciding with the Oceanic Anoxic Event 2 (OAE2) or Bonarelli Event.We present an interdisciplinary analysis of the C/T transition at the Spanish El Chorro section (Betic Cordillera),and show the results of studies on planktic and benthic foraminifera, calcareous nannoplankton, radiolariaand environmental magnetic properties. The planktic foraminiferal biozones Rotalipora cushmani, Whiteinellaarchaeocretacea and Helvetoglobotruncana helvetica and the calcareous nannoplankton biozones NC11,NC12 and NC13 have been recognized. Diversity of the radiolarian assemblages gradually decreases fromthe upper Cenomanian towards the middle part of the OAE2 interval, where it reaches the lowest values,recovering above the OAE2. Oxygenation of the sea-bottom waters decreased towards the late Cenomanian,as inferred from a decrease in species size of benthic foraminifera 40 cm below the OAE2. Assemblages fromthe upper part of the section contain abundant and tiny epifaunal, trochospiral species and representativesof Tappanina, Pleurostomella and small buliminids. These data indicate that low oxygen conditions persistedtowards the top of the section, 370 cm above the top of the OAE2 black shales
PB Universidad de Huelva
YR 2010
FD 2010
LK http://hdl.handle.net/10272/7472
UL http://hdl.handle.net/10272/7472
LA spa
DS Repositorio Institucional de la Universidad de Huelva
RD 29 may 2026