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Baceta, J. I.
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Baceta, J. I.
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- PublicationRestrictedThe Global Stratotype Sections and Points for the bases of the Selandian (Middle Paleocene) and Thanetian (Upper Paleocene) stages at Zumaia, Spain(2011-12)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;Schmitz, B.; Department of Geology, Lund University, SE-22362 Lund, Sweden ;Pujalte, V.; Department of Stratigraphy and Paleontology, University of the Basque Country, E-48080 Bilbao, Spain ;Molina, E.; Department of Earth Sciences, Zaragoza University, E-50009 Zaragoza, Spain ;Monechi, S.; Department of Earth Sciences, Florence University, 50121 Florence, Italy ;Orue-Etxebarria, X.; Department of Stratigraphy and Paleontology, University of the Basque Country, E-48080 Bilbao, Spain ;Speijer, R. P.; Department of Earth and Environmental Sciences, K.U. Leuven, B-3001 Leuven, Belgium ;Alegret, L.; Department of Earth Sciences, Zaragoza University, E-50009 Zaragoza, Spain ;Apellaniz, E.; Department of Stratigraphy and Paleontology, University of the Basque Country, E-48080 Bilbao, Spain ;Arenillas, I.; Department of Earth Sciences, Zaragoza University, E-50009 Zaragoza, Spain ;Aubry, M. P.; Department of Geology, Rutgers University, Piscatatway, NJ 08854 USA. ;Baceta, J. I.; Department of Stratigraphy and Paleontology, University of the Basque Country, E-48080 Bilbao, Spain ;Berggren, W. A.; Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA ;Bernaola, G.; Department of Mining and Metallurgic Engineering and Material Sciences, University of the Basque Country, E-48901 Barakaldo, Spain ;Caballero, F.; Department of Stratigraphy and Paleontology, University of the Basque Country, E-48080 Bilbao, Spain ;Clemmensen, A.; Department of Earth Sciences, Århus University, DK-8000 Århus C, Denmark ;Dinarès-Turell, J.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Dupuis, C.; Laboratoire de Géologie Fondamentale et Appliquée, Faculté Polytechnique de Mons, B-7000 Mons, Belgium ;Heilmann-Clausen, C.; Department of Earth Sciences, Århus University, DK-8000 Århus C, Denmark ;Orús, A. H.; Eguzkialde 13, E-20271 Irura, Gipuzkoa, Spain ;Knox, R.; British Geological Survey, Kingsley Durham Centre, Keyworth, Nottingham NG12 5GG, United Kingdom ;Martín-Rubio, M.; Department of Mining and Metallurgic Engineering and Material Sciences, University of the Basque Country, E-48901 Barakaldo, Spain ;Ortiz, S.; Department of Earth Sciences, Zaragoza University, E-50009 Zaragoza, Spain ;Payros, A.; Department of Stratigraphy and Paleontology, University of the Basque Country, E-48080 Bilbao, Spain ;Petrizzo, M. R.; Department of Earth Sciences, Milano University, 20133 Milano, Italy ;von Salis, K.; Via Maistra 9, CH-7513 Silvaplana, Switzerland ;Sprong, J.; Department of Earth and Environmental Sciences, K.U. Leuven, B-3001 Leuven, Belgium ;Steurbaut, E.; Department of Paleontology, Royal Belgian Institute of Natural Sciences, B-1000 Brussels, Belgium ;Thomsen, E.; Department of Earth Sciences, Århus University, DK-8000 Århus C, Denmark; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; The global stratotype sections and points for the bases of the Selandian (Middle Paleocene) and Thanetian (Upper Paleocene) stages have been defined in the coastal cliff along the Itzurun Beach at the town of Zumaia in the Basque Country, northern Spain. In the hemipelagic section exposed at Zumaia the base of the Selandian Stage has been placed at the base of the Itzurun Formation, ca. 49 m above the Cretaceous/ Paleogene boundary. At the base of the Selandian, marls replace the succession of Danian red limestone and limestone-marl couplets. The best marine, global correlation criterion for the basal Selandian is the second radiation of the important calcareous nannofossil group, the fasciculiths. Species such as Fasciculithus ulii, F. billii, F. janii, F. involutus, F.pileatus and F. tympaniformis have their first appearance in the interval from a few decimetres below up to 1.1 m above the base of the Selandian. The marker species for nannofossil Zone NP5, F. tympaniformis, first occurs 1.1 m above the base. Excellent cyclostratigraphy and magnetostratigraphy in the section creates further correlation potential, with the base of the Selandian occuring 30 precession cycles (630 kyr) above the top of magnetochron C27n. Profound changes in sedimentology related to a major sea-level fall characterize the Danian-Selandian transition in sections along the margins of the North Atlantic. The base of the Thanetian Stage is placed in the same section ca. 78 m above the Cretaceous/Paleogene boundary. It is defined at a level 2.8 m or eight precession cycles above the base of the core of the distinct clay-rich interval associated with the Mid-Paleocene Biotic Event, and it corresponds to the base of magnetochron C26n in the section. The base of the Thanetian is not associated with any significant change in marine micro-fauna or flora. The calcareous nannofossil Zone NP6, marked by the first occurrence of Heliolithus kleinpelli starts ca. 6.5 m below the base of the Thanetian. The definitions of the global stratotype points for the bases of the Selandian and Thanetian stages are in good agreements with the definitions in the historical stratotype sections in Denmark and England, respectively.293 30 - PublicationRestrictedEvidences of an abrupt environmental disruption during the Mid Paleocene Biotic Event (Zumaia section, W Pyrenees)(2007)
; ; ; ; ; ; ; ;Bernaola, G.; Departamento de Estratigrafía y Paleontología, Facultad de Ciencia y Tecnología, Universidad del País Vasco, Apartado de correos 644, 48080 Bilbao, Spain ;Baceta, J. I.; Departamento de Estratigrafía y Paleontología, Facultad de Ciencia y Tecnología, Universidad del País Vasco, Apartado de correos 644, 48080 Bilbao, Spain ;Orue-Etxebarria, X.; Departamento de Estratigrafía y Paleontología, Facultad de Ciencia y Tecnología, Universidad del País Vasco, Apartado de correos 644, 48080 Bilbao, Spain ;Alegret, L.; Área de Estratigrafía, Departamento de Ciencias de la Tierra, Universidad de Zaragoza, E-50009 Zaragoza, Spain ;Martín-Rubio, M.; Departamento de Estratigrafía y Paleontología, Facultad de Ciencia y Tecnología, Universidad del País Vasco, Apartado de correos 644, 48080 Bilbao, Spain ;Arostegui, J.; Departamento de Mineralogía y Petrología, Facultad de Ciencia y Tecnología, Universidad del País Vasco, Apartado de correos 644, 48080 Bilbao, Spain ;Dinarès-Turell, J.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia; ; ; ; ; ; An abrupt environmental disruption occurred in the photic zone and at the seafl oor 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 signifi cantly 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 fl ux (type and quantity) to the seafl oor, 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 limestone-marl 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 fi rst 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 shortlived event.179 21 - PublicationRestrictedThe Palaeocene ‘‘top chron C27n’’ transient greenhouse episode: evidence from marine pelagic Atlantic and peri-Tethyan sections(2012)
; ; ; ; ; ;Dinarès-Turell, J.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Pujalte, V.; Department of Stratigraphy and Paleontology, Fac. Science and Technology, University of the Basque Country UPV⁄EHU, PO Box 644, Bilbao E-48080, Spain ;Stoykova, K.; Department of Paleontology and Stratigraphy, Geological Institute, Bulgarian Academy of Science, Sofia BG-1113, Bulgaria ;Baceta, J. I.; Department of Stratigraphy and Paleontology, Fac. Science and Technology, University of the Basque Country UPV⁄EHU, PO Box 644, Bilbao E-48080, Spain ;Ivanov, M.; Department of Geology and Paleontology, University of Sofia, Sofia BG-1000, Bulgaria; ; ; ; The early Cenozoic, which is punctuated by several negative carbon isotope excursions (CIEs), was a time of climatic and oceanographic transition from ’Greenhouse’ to ’Icehouse’ conditions. The occurrence of a 0.5& CIE starting at the top of Chron C27n (TC27N) is reconfirmed with stable isotope data from Zumaia (Spain) and Bjala (Bulgaria) localities. Spectral analysis on respective carbonate ⁄magnetic susceptibility proxy records substantiates the orbital cyclostratigraphy allowing correlation to a high-resolution benthic foraminifera isotope record from ODP Pacific Site 1209, that indicates a coeval 2 C transient warming. The hyperthermal event lasts 200 ka, contrasting with other short-lived events from the Eocene, and displays a relatively rapid onset and a longer tailing back to pre-event values similar to the Palaeocene–Eocene Thermal Maximum (PETM), though lower in amplitude. That a causal trigger for the TC27N event may be the onset of volcanism in the North Atlantic Igneous Province (NAIP) can be inferred from a 200-m-thick lava pile erupted during C27n ⁄ C26r polarity transition in the E Greenland margin.265 35 - PublicationRestrictedHigh-resolution intra- and interbasinal correlation of the Danian–Selandian transition (Early Paleocene): The Bjala section (Bulgaria) and the Selandian GSSP at Zumaia (Spain)(2010-09-16)
; ; ; ; ; ;Dinarès-Turell, J.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Stoykova, K.; Department of Paleontology and Stratigraphy, Geological Institute, Bulgarian Academy of Science, BG-1113 Sofia, Bulgaria ;Baceta, J. I.; Department of Stratigraphy, Univ. Basque Country, PO Box 644, E-48080 Bilbao, Spain ;Ivanov, M.; Department of Geology and Paleontology, University of Sofia, BG-1000 Sofia, Bulgaria ;Pujalte, V.; Department of Stratigraphy, Univ. Basque Country, PO Box 644, E-48080 Bilbao, Spain; ; ; ; The Danian–Selandian (D–S) boundary has been identified for the first time in the Black Sea coast at Bjala (Bulgaria) based on a new integrated bio-, magneto- and cyclostratigraphic study. Several correlation criteria as established for the basal Selandian GSSP from Zumaia (Basque Basin) are evaluated. Noteworthy, is the almost complete lack of calcareous nannoplankton species Braarudosphaera bigelowi in the Bulgarian sections, a sharp decrease of which was indicated as suitable criteria for defining the D–S boundary as it occurred both at Zumaia and in the classical locations of the North Sea basin. Conversely, the second evolutionary radiation of the calcareous nannofossil genus Fasciculithus together with the occurrence of Fasciculithus tympaniformis that define the NP4/NP5 zonal boundary seem to be reliable criteria to approximate the D–S boundary. In detail, however, the best approach is to integrate biostratigraphic data within a magnetostratigraphic and/or cyclostratigraphic framework. Refinements on the placement of chron C27n at Zumaia and robust bed-by-bed correlation between several Basque sections and Bjala indicates that the D–S boundary is located 30 precession cycles (~630 ky) above C27n. In addition to the precession-related marl–limestone couplets and 100-ky eccentricity bundles recognized in the studied sections, expression of the stable 405-ky long eccentricity allows direct tuning to the astronomical solutions. A correlation of the land-based sections with previously tuned data from ODP Site1262 from the Southern Atlantic is challenged. Our choice is consistent with original tuning at Zumaia but shifts one 100-ky cycle older previous tuning from Site 1262 along the interval above C27n. Under the preferred tuning scheme the D–S boundary can be given an age of 61.641± 0.040 Ma on the La04 orbital solution.178 28 - PublicationRestrictedCorrelation of the Thanetian-Ilerdian turnover of larger foraminifera and the Paleocene-Eocene thermal maximum: confirming evidence from the Campo area (Pyrenees, Spain)(2009-03)
; ; ; ; ; ; ; ; ; ;Pujalte, V.; Department of Stratigraphy and Paleontology, Faculty of Science and Technology, University of the Basque Country, Bilbao, Spain ;Schmitz, B.; Department of Geology, University of Lund, Lund, Sweden ;Baceta, J. I.; Department of Stratigraphy and Paleontology, Faculty of Science and Technology, University of the Basque Country, Bilbao, Spain ;Orue-Etxebarria, X.; Department of Stratigraphy and Paleontology, Faculty of Science and Technology, University of the Basque Country, Bilbao, Spain ;Bernaola, G.; Department of Stratigraphy and Paleontology, Faculty of Science and Technology, University of the Basque Country, Bilbao, Spain ;Dinarès-Turell, J.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Payros, A.; Department of Stratigraphy and Paleontology, Faculty of Science and Technology, University of the Basque Country, Bilbao, Spain ;Apellaniz, E.; Department of Stratigraphy and Paleontology, Faculty of Science and Technology, University of the Basque Country, Bilbao, Spain ;Caballero, F.; Department of Stratigraphy and Paleontology, Faculty of Science and Technology, University of the Basque Country, Bilbao, Spain; ; ; ; ; ; ; ; It has long been known that a major larger foraminifera turnover (LFT) occurred at the boundary between the Thanetian and Ilerdian stages, but its possible correlation with the Paleocene-Eocene thermal maximum (PETM) was unsuspected until the work of Baceta (1996), and has been controversial ever since. After summarizing the history of this controversy, we present information from three new sections that conclusively resolve the issue, all of them placed less than 2 km to the east of the classical Campo section in the southern Pyrenees. In these three sections, an up to 7 meter-thick intercalation of continental deposits rich in pedogenic carbonate nodules is sandwiched between uppermost Thanetian and lowermost Ilerdian shallow marine carbonates. The δ13C composition of 42 pedogenic nodules collected from two of these sections (San Martín and La Cinglera) ranges between –11.4 and -14.3‰ and averages –12.9‰, values that conclusively represent the PETM and for the first time are recorded in sections where the LFT is clearly represented. Further, a high-resolution lithological correlation between Campo and the three new sections across the P-E interval unquestionably demonstrates that the lowermost marine beds with autochthonous specimens of Alveolina vredenburgi (a tell-tale of the LFT) are laterally interfingered –and are therefore coeval- with the nodule-bearing PETM continental deposits. On the basis of the new evidence, the temporal coincidence of the PETM and the LFT can no longer be doubted.185 32 - PublicationOpen AccessMagneto- and cyclostratigraphy of the Mid-Paleocene interval, in Climate & Biota of the Early Paleogene(2006)
; ; ; ;Dinarès-Turell, J.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Baceta, J.; University of the Basque Country, Bilbao ;Pujalte, V.; University of the Basque Country, Bilbao; ; NONE477 2609