Lower Aptian ammonite and carbon isotope stratigraphy in the eastern Prebetic Domain (Betic Cordillera, southeastern Spain)
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AuthorMoreno-Bedmar, Josep Anton; Company Sempere, Miguel; Sandoval, J.; Tavera, J. M.; Bover-Arnal, T.; Salas, Ramón; Delanoy, Gerard; Maurrasse, Florentin; Martínez, Ricard
Universidad de Barcelona; Instituto de Ciencias de la Tierra Jaume Almera
AmmonitesLower AptianOAE 1aBiostratigraphyPrebetic DomainSoutheastern Spain
Moreno-Bedmar, J.A.; et al. Lower Aptian ammonite and carbon isotope stratigraphy in the eastern Prebetic Domain (Betic Cordillera, southeastern Spain). Geologica Acta, 10(4): 333-350 (2012). [http://hdl.handle.net/10481/32087]
SponsorshipThis study was funded by Projects CGL2005-07445-CO3-01/BTE Bi, CGL2008-04916, CGL2005-02500 and CGL2008-00533 (Spanish Ministry of Education and Science), the Consolider-Ingenio 2010 programme, under CSD2006-0004 “Topo-Iberia”, the Grup Consolidat de Recerca “Geologia Sedimentària” (2005SGR-00890), the Research Group RNM-178 (Junta de Andalucía), and 1074/1-2 of the Deutsche Forschungsgemeinschaft.
Major global palaeobiologic and palaeoenvironmental changes occurred during the Early Aptian. Precise dating and timing of the different events is crucial to determine possible cause-effect relationships between them. In this regard, the combination of biostratigraphic and chemostratigraphic data can provide a very useful tool for time control. So far attempts to correlate the Lower Aptian carbon isotope record and the ammonite zonation yielded contradictory conclusions. In this paper, we present the results of an integrated analysis of the ammonite stratigraphic distribution and highresolution carbon isotope profiles from Lower Aptian sections of the eastern Prebetic Domain (Betic Cordillera, southeastern Spain). We recognized, in ascending order, the Deshayesites oglanlensis, Deshayesites forbesi, Deshayesites deshayesi, and Dufrenoyia furcata Zones. This succession is the same as that recently identified in the eastern Iberian Chain, and it closely correlates with both standard Mediterranean and Boreal zonations. The carbon isotope record displays the trends globally recognized for the Early Aptian, with two long positive shifts separated by a pronounced negative excursion. Calibration of this isotopic record with the ammonite zonation shows that the age of OAE 1a, which corresponds to the negative excursion and subsequent positive shift, is constrained to the middle/upper part of the Deshayesites forbesi Zone.