Base of the Toarcian Stage of the Lower Jurassic defined by the Global Boundary Stratotype Section and Point (GSSP) at the Peniche section (Portugal)
Autor: | María José Comas-Rengifo, Kate Littler, Maria Cristina Cabral, Luís V. Duarte, Serge Elmi, Hugh C. Jenkyns, Luiz Carlos Veiga de Oliveira, Antonio Goy, René Mouterde, Samuel Mailliot, Guillaume Suan, Christiane Ruget, Stephen P. Hesselbo, Nicola Perilli, Susana Pinto, Bernard Pittet, Emanuela Mattioli, María Luisa Osete, Rogério Rocha, Juan J. Gómez |
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Přispěvatelé: | Universidade Nova de Lisboa = NOVA University Lisbon (NOVA), Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement (LGL-TPE), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS), Marine and Environmental Sciences Centre (MARE UC), Universidade de Coimbra [Coimbra], Université Catholique de Lyon (UCLy) (UCLy), Centro de Geologia [Lisboa], Universidade de Lisboa = University of Lisbon (ULISBOA), Universidad Complutense de Madrid = Complutense University of Madrid [Madrid] (UCM), Camborne School of Mines, College of Engineering, Mathematics and Physical Sciences, University of Exeter, Department of Earth Sciences [Oxford], University of Oxford, Universita di Pisa Dip. Scienze Geologiche (UNIV. PISA), University of Pisa - Università di Pisa, Departamento de Física de la Tierra, Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement [Lyon] (LGL-TPE), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-École normale supérieure - Lyon (ENS Lyon), Universidade de Lisboa (ULISBOA), University of Oxford [Oxford] |
Jazyk: | angličtina |
Rok vydání: | 2016 |
Předmět: |
010506 paleontology
biology Dactylioceras Peniche Metamorphism [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Geofísica 010502 geochemistry & geophysics biology.organism_classification 01 natural sciences Diagenesis Global Boundary Stratotype Section and Point Paleontology Tectonics 13. Climate action Stage (stratigraphy) Facies General Earth and Planetary Sciences 14. Life underwater Geology 0105 earth and related environmental sciences |
Zdroj: | Episodes Journal of International Geoscience Episodes Journal of International Geoscience, 2016, ⟨10.18814/epiiugs/2016/v39i3/99741⟩ Episodes Journal of International Geoscience, Seoul National University, 2016, ⟨10.18814/epiiugs/2016/v39i3/99741⟩ Digital.CSIC. Repositorio Institucional del CSIC instname |
ISSN: | 0705-3797 |
DOI: | 10.18814/epiiugs/2016/v39i3/99741⟩ |
Popis: | The Global Stratotype Section and Point (GSSP) for the base of Toarcian Stage, Lower Jurassic, is placed at the base of micritic limestone bed 15e at Ponta do Trovão (Peniche, Lusitanian Basin, Portugal; coordinates: 39°22'15''N, 9°23'07''W), 80km north of Lisbon, and coincides with the mass occurrence of the ammonite Dactylioceras (Eodactylites). The Pliensbachian/ Toarcian boundary (PLB/TOA) is contained in a continuous section forming over 450m of carbonate-rich sediments. Tectonics, syn-sedimentary disturbance, metamorphism or significant diagenesis do not significantly affect this area. At the PLB/TOA, no vertical facies changes, stratigraphical gaps or hiatuses have been recorded. The base of the Toarcian Stage is marked in the bed 15e by the first occurrence of D. (E.) simplex, co-occurring with D. (E.) pseudocommune and D. (E.) polymorphum. The ammonite association of D. (Eodactylites) ssp. and other species e.g. Protogrammoceras (Paltarpites) cf. paltum, Lioceratoides aff. ballinense and Tiltoniceras aff. capillatum is particularly significant for the boundary definition and correlation with sections in different basins. Ammonites of the PLB/ TOA are taxa characteristic of both the Mediterranean and Northwest European provinces that allow reliable, global correlations. The PLB/TOA is also characterized by other biostratigraphical markers (brachiopods, calcareous nannofossils, ostracods and benthic foraminifers) and by high-resolution stable carbon and oxygen isotopes, and 87Sr/86Sr ratios that show distinctive changes just above the PLB/TOA, thus providing additional, powerful tools for global correlations. The PBL-TOA lies at the end of a second (and third) order cycle of sea-level change, and the top of bed 15e is interpreted as a sequence boundary. Cyclostratigraphy analysis is available for the Lower Toarcian of Ponta do Trovão. Detailed correlations with the Almonacid de la Cuba section (Iberian Range, Spain) provide complementary data of the ammonite succession in the Northwest European Hawskerense and Paltum Subzones, and magnetostratigraphical data that allow supraregional correlations. The proposal was voted on by the Toarcian Working Group in June, 2012, and by the International Subcommission on Jurassic Stratigraphy in September, 2012, approved by the ICS in November, 2014, and ratified by the IUGS in December, 2014. With this Toarcian GSSP, all international stages of the Lower Jurassic have been officially defined. This work has been supported by the BIOSCALES Project (POCTI/ 36438/PAL/2000), coordinated by the Universidade NOVA de Lisboa; R. B. Rocha thanks the support of A. F. Soares, J. C. Kullberg, P. S. Caetano and P. H. Verdial. Financial support was provided to L. V. Duarte, S. Pinto and M. C. Cabral by Projects PDCTE/CTA/44907/ 2002 and PTDC/CTE-GIX/098968/2008. |
Databáze: | OpenAIRE |
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