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Origin and implications of orbital-induced sedimentary cyclicity in Pliocene well-logs of the Western Mediterranean

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dc.contributor.author Ochoa, D.
dc.contributor.author Sierro, F. J.
dc.contributor.author Hilgen, F. J.
dc.contributor.author Cortina, A.
dc.contributor.author Lofi, J.
dc.contributor.author Kouwenhoven, T.
dc.contributor.author Flores, J. A.
dc.date.accessioned 2018-12-01T00:04:15Z
dc.date.available 2018-12-01T00:04:15Z
dc.date.issued 2018
dc.identifier.uri https://hdl.handle.net/20.500.12866/4250
dc.description.abstract The climatic origin of astronomically induced sedimentary cycles in the Mediterranean and adjacent areas during the late Neogene and Quaternary remains puzzling; as cycles have been linked to concomitant but seasonally opposite changes in African summer monsoon precipitation (Eastern Mediterranean sapropels) and Atlantic regulated winter-precipitation (carbonate cycles on the Atlantic side of the Mediterranean). Particularly, little is known about the cyclic sedimentation on orbital time scales in the Western Mediterranean, with the prime exception of the Messinian sapropels from the Sorbas basin (southern Spain). Here we show that regular alternations in Pliocene downhole logs from the industrial drill-site Muchamiel-1, located along the Balearic Promontory in the Western Mediterranean, are related to eccentricity (bundles) and to obliquity and precession cycles (basic meter-scale alternations). We establish an astronomically based age model for the interval between 5.33 and 2.8 Ma, by first correlating cycle bundles to eccentricity and then the basic dominantly precession-related cycles to the 65°N summer insolation of La2004. The striking bed-to-bed similarities between the Muchamiel-1 well-logs and other records from both the Atlantic margin and the Central Mediterranean suggest that the same climatic forcing was responsible for the formation of carbonate cycles across the Western Mediterranean and adjacent Atlantic. We conclude that formation of alternating carbonate-rich/carbonate-poor beds was controlled by Western Mediterranean cyclogenetic mechanisms as well as by peri-Mediterranean precipitation associated with changes in the North Atlantic System (NAS). These findings highlight the importance of peri-Mediterranean precipitation on the sedimentary cyclicity by dictating terrigenous (clay) supply and potentially on the hydrology of the basin by providing additional freshwater required for sapropel formation. Consequently, cyclic sedimentation in the Mediterranean results from the combined effect of precipitation changes driven by (i) the North African monsoon, (ii) the Atlantic system, and (iii) intrabasinal Mediterranean atmospheric dynamics. en_US
dc.language.iso eng
dc.publisher Elsevier
dc.relation.ispartof urn:issn:1872-6151
dc.rights info:eu-repo/semantics/restrictedAccess
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/4.0/deed.es
dc.subject sedimentation en_US
dc.subject Spain en_US
dc.subject Mediterranean Sea en_US
dc.subject Almeria [Andalucia] en_US
dc.subject Andalucia en_US
dc.subject Atlantic Ocean en_US
dc.subject Atlantic Ocean (North) en_US
dc.subject Atmospheric thermodynamics en_US
dc.subject carbonate en_US
dc.subject Carbonate cycle en_US
dc.subject Carbonate cycles en_US
dc.subject Carbonation en_US
dc.subject climate forcing en_US
dc.subject Cyclicity en_US
dc.subject cyclostratigraphy en_US
dc.subject Cyclostratigraphy en_US
dc.subject Mediterranean climate en_US
dc.subject Mediterranean climates en_US
dc.subject Mediterranean Sea (West) en_US
dc.subject monsoon en_US
dc.subject Neogene en_US
dc.subject Pliocene en_US
dc.subject Pliocene cyclostratigraphy en_US
dc.subject precession en_US
dc.subject precipitation (climatology) en_US
dc.subject Quaternary en_US
dc.subject sapropel en_US
dc.subject Sapropel formation en_US
dc.subject seasonal variation en_US
dc.subject Sedimentology en_US
dc.subject Sorbas Basin en_US
dc.subject Well log data en_US
dc.subject well logging en_US
dc.subject Well logging en_US
dc.subject Well-log data en_US
dc.subject Western Mediterranean sedimentary cyclicity en_US
dc.title Origin and implications of orbital-induced sedimentary cyclicity in Pliocene well-logs of the Western Mediterranean en_US
dc.type info:eu-repo/semantics/article
dc.identifier.doi https://doi.org/10.1016/j.margeo.2018.05.009
dc.subject.ocde https://purl.org/pe-repo/ocde/ford#3.02.00 es_PE


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