Updating the marine biostratigraphy of the Granada Basin (central Betic Cordillera). Insight for the Late Miocene palaeogeographic evolution of the Atlantic – Mediterranean seaway

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Title: Updating the marine biostratigraphy of the Granada Basin (central Betic Cordillera). Insight for the Late Miocene palaeogeographic evolution of the Atlantic – Mediterranean seaway
Authors: Corbí, Hugo | Lancis Sáez, Carlos | García García, Fernando | Pina Gosálbez, José Antonio | Soria Mingorance, Jesús Miguel | Tent-Manclus, Jose Enrique | Viseras Alarcón, César
Research Group/s: Cambios Paleoambientales | Evolución Geodinámica de la Cordillera Bética Oriental y de la Plataforma Marina de Alicante
Center, Department or Service: Universidad de Alicante. Departamento de Ciencias de la Tierra y del Medio Ambiente
Keywords: Biostratigraphy | Planktonic foraminifera | Calcareous nannoplankton | Evaporites | Granada Basin | Late Miocene
Knowledge Area: Estratigrafía | Paleontología | Geodinámica Interna
Date Created: 2012
Issue Date: 19-May-2012
Publisher: Elsevier
Citation: Geobios. 2012, 45: 249–263. doi:10.1016/j.geobios.2011.10.006
Abstract: The marine stratigraphic record of the Granada Basin (central Betic Cordillera, Spain) is composed of three Late Miocene genetic units deposited in different sea-level contexts (from base to top): Unit I (sea-level rise), Unit II (high sea-level), and Unit III (low sea-level). The latter mainly consists of evaporites precipitated in a shallow-basin setting. Biostratigraphic analyses based on planktonic foraminifera and calcareous nannoplankton indicate four late Tortonian bioevents (PF1-CN1, PF2, PF3, and PF4), which can be correlated with astronomically-dated events in other sections of the Mediterranean. PF1-CN1 (7.89 Ma) is characterized by the influx of the Globorotalia conomiozea group (including typical forms of Globorotalia mediterranea) and by the first common occurrence of Discoaster surculus; PF2 (7.84 Ma) is marked by the first common occurrence of Globorotalia suterae; PF3 (7.69 Ma) is typified by the influx of dextral Neogloboquadrina acostaensis; and PF4 (7.37 Ma) is defined by the influx of the Globorotalia menardii group II (dextral forms). The PF1 event occurred in the upper part of Unit I, whereas PF2 to PF4 events occurred successively within Unit II. The age of Unit III (evaporites) can only be estimated in its lower part based on the presence of dextral Globorotalia scitula, which, together with the absence of the first common occurrence of the G. conomiozea group (7.24 Ma), points to the latest Tortonian. Comparisons with data from the other Betic basins indicate that the evaporitic phase of the Granada Basin (7.37–7.24 Ma) is not synchronous with those from the Lorca Basin (7.80 Ma) and the Fortuna Basin (7.6 Ma). In the Bajo Segura Basin (easternmost Betic Cordillera), no evaporite deposition occurred during the late Tortonian. The evaporitic unit of the Granada Basin (central Betics) records the late Tortonian restriction of the Betic seaway (the marine connection between the Atlantic and Mediterranean). The diachrony in the restriction of the Betic seaway is related to differing tectonic movements in the central and eastern sectors of the Betic Cordillera.
Sponsor: Financial aid was provided by Research Projects CGL2007-65832 MEC, CGL2009-07830 MCI, GV04B-629 (Generalitat Valenciana) and the “Paleoenvironmental Changes” Group (UA).
URI: http://hdl.handle.net/10045/33591
ISSN: 0016-6995 (Print) | 1777-5728 (Online)
DOI: 10.1016/j.geobios.2011.10.006
Language: eng
Type: info:eu-repo/semantics/article
Peer Review: si
Publisher version: http://dx.doi.org/10.1016/j.geobios.2011.10.006
Appears in Collections:INV - CP - Artículos de Revistas
INV - GEODIN - Artículos de Revistas

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