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Evidence of an abrupt environmental disruption during the mid-Paleocene biotic event (Zumaia section, western Pyrenees)

2007; Geological Society of America; Volume: 119; Issue: 7-8 Linguagem: Inglês

10.1130/b26132.1

1943-2674

Gilen Bernaola, Juan Ignacio Baceta, Xabier Orue‐Etxebarria, Laia Alegret, M. Martín-Rubio, J. Aróstegui, Jaume Dinarès‐Turell,

Geological formations and processes

Research Article| July 01, 2007 Evidence of an abrupt environmental disruption during the mid-Paleocene biotic event (Zumaia section, western Pyrenees) Gilen Bernaola; Gilen Bernaola 1Departamento de Estratigrafía y Paleontología, Facultad de Ciencia y Tecnología, Universidad del País Vasco, Apartado de correos 644, 48080 Bilbao, Spain Search for other works by this author on: GSW Google Scholar Juan Ignacio Baceta; Juan Ignacio Baceta 1Departamento de Estratigrafía y Paleontología, Facultad de Ciencia y Tecnología, Universidad del País Vasco, Apartado de correos 644, 48080 Bilbao, Spain Search for other works by this author on: GSW Google Scholar Xabier Orue-Etxebarria; Xabier Orue-Etxebarria 1Departamento de Estratigrafía y Paleontología, Facultad de Ciencia y Tecnología, Universidad del País Vasco, Apartado de correos 644, 48080 Bilbao, Spain Search for other works by this author on: GSW Google Scholar Laia Alegret; Laia Alegret 2Área de Estratigrafía, Departamento de Ciencias de la Tierra, Universidad de Zaragoza, E-50009 Zaragoza, Spain Search for other works by this author on: GSW Google Scholar Maite Martín-Rubio; Maite Martín-Rubio 3Departamento de Estratigrafía y Paleontología, Facultad de Ciencia y Tecnología, Universidad del País Vasco, Apartado de correos 644, 48080 Bilbao, Spain Search for other works by this author on: GSW Google Scholar Javier Arostegui; Javier Arostegui 4Departamento de Mineralogía y Petrología, Facultad de Ciencia y Tecnología, Universidad del País Vasco, Apartado de correos 644, 48080 Bilbao, Spain Search for other works by this author on: GSW Google Scholar Jaume Dinarès-Turell Jaume Dinarès-Turell 5Istituto Nazionale di Geofisica e Vulcanologia, Via de Vigna Murata 605, 00143 Rome, Italy Search for other works by this author on: GSW Google Scholar Author and Article Information Gilen Bernaola 1Departamento de Estratigrafía y Paleontología, Facultad de Ciencia y Tecnología, Universidad del País Vasco, Apartado de correos 644, 48080 Bilbao, Spain Juan Ignacio Baceta 1Departamento de Estratigrafía y Paleontología, Facultad de Ciencia y Tecnología, Universidad del País Vasco, Apartado de correos 644, 48080 Bilbao, Spain Xabier Orue-Etxebarria 1Departamento de Estratigrafía y Paleontología, Facultad de Ciencia y Tecnología, Universidad del País Vasco, Apartado de correos 644, 48080 Bilbao, Spain Laia Alegret 2Área de Estratigrafía, Departamento de Ciencias de la Tierra, Universidad de Zaragoza, E-50009 Zaragoza, Spain Maite Martín-Rubio 3Departamento de Estratigrafía y Paleontología, Facultad de Ciencia y Tecnología, Universidad del País Vasco, Apartado de correos 644, 48080 Bilbao, Spain Javier Arostegui 4Departamento de Mineralogía y Petrología, Facultad de Ciencia y Tecnología, Universidad del País Vasco, Apartado de correos 644, 48080 Bilbao, Spain Jaume Dinarès-Turell 5Istituto Nazionale di Geofisica e Vulcanologia, Via de Vigna Murata 605, 00143 Rome, Italy Publisher: Geological Society of America Received: 23 Oct 2006 Revision Received: 05 Mar 2007 Accepted: 23 Mar 2007 First Online: 08 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (2007) 119 (7-8): 785–795. https://doi.org/10.1130/B26132.1 Article history Received: 23 Oct 2006 Revision Received: 05 Mar 2007 Accepted: 23 Mar 2007 First Online: 08 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Gilen Bernaola, Juan Ignacio Baceta, Xabier Orue-Etxebarria, Laia Alegret, Maite Martín-Rubio, Javier Arostegui, Jaume Dinarès-Turell; Evidence of an abrupt environmental disruption during the mid-Paleocene biotic event (Zumaia section, western Pyrenees). GSA Bulletin 2007;; 119 (7-8): 785–795. doi: https://doi.org/10.1130/B26132.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract An abrupt environmental disruption occurred in the photic zone and at the seafloor during the mid-Paleocene biotic event (MPBE). Calcareous nannoplankton, planktic foraminifer, and benthic foraminifer assemblages at Zumaia section (western Pyrenees) underwent a rapid and remarkable transformation. The major calcareous plankton assemblage changes suggest a shift from relatively cooler mesotrophic to warmer, more oligotrophic conditions, indicating a disturbed environment due to the warming of the ocean. Benthic foraminifer assemblages were also significantly affected by the MPBE; diversity of the assemblages and buliminids show net decline and the low food and opportunistic taxa increase in abundance. The reorganization of the planktic ecosystem possibly involved changes in the food flux (type and quantity) to the seafloor, thus triggering changes in the benthic communities.A 1‰ negative δ13C shift and a 30% carbonate content decrease are recorded in connection with the biotic event. This suggests that during the MPBE, as in the Paleocene-Eocene Thermal Maximum (PETM), an input of a large mass of isotopically depleted carbon into the ocean and atmosphere could have lowered the deep-sea pH, triggering a rapid shoaling of the lysocline and contributing to greenhouse warming.The MPBE was short lived: according to the counting of limestonemarl couplets, the stratigraphic expression of precession cycles throughout the Zumaia section, the MPBE lasted for ∼52–53 k.y., with the core of the event representing ∼10–11 k.y.The Zumaia section is the first land-based locality in which the MPBE is recognized and described in detail. Due to its expanded character and excellent paleontological record, this section may prove to be a global reference section for the study of this short-lived event. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.