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Análisis sedimentológico y caracterización paleoclimática de la sucesión cíclica de Orerà, Mioceno continental de la Cuenca de Calatayud

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Sanz Rubio, Enrique and Abdul-Aziz, H. and Calvo Sorando, José Pedro and Hilgen, Frederik J. and Krijgsman, Wout (2001) Análisis sedimentológico y caracterización paleoclimática de la sucesión cíclica de Orerà, Mioceno continental de la Cuenca de Calatayud. Geotemas, 3 (2). pp. 85-90. ISSN 1576-5172

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Abstract

The representation of continental and continuous cyclically bedded sequences for long time intervals in the sedimentary record of the Iberian Peninsula is very scarce. The middle Miocene sedimentary fill o f the Calatayud Basin (NE Spain) consists of proximal to distal alluvial fanfloodplain and shallow lacustrine deposits. A 160 m-thick lacustrine succession showing an exceptional cyclical bedding (Orera Composite Section, OCS) is exposed close to the Orera Village, in the northern margin of the basin. The correlation of the magnetostratigraphy of the OCS with the Geomagnetic Polarity Time Scale (GPTS), resulted in an age o f 10.7-12.8 Ma for the entire section, which is supported by biostratigraphical data. The cyclic shallow lacustrine succession comprises 91 superposed small-scale cycles, each consisting mainly of an alternation of greygreenish mudstone and white dolomite beds. Based on the number of cycles, the average periodicity of the basic small-scale cycles is approximately 23,000 yr. This periodicity suggests that deposition of the sedimentary cycles was controlled by astronomically induced climate changes causing lake-level fluctuations. The deposition of these cycles took place in a low gradient, shallow lake basin developed in an "inter-fan" zone (Miedes and Orera alluvial fans). The small-scale cycles are interpreted as a result of the evolution from mudflat deposits (red and green-grey clays), accumulated in lowstand periods o f the lake, to shallow lake deposits (dolomites) during relatively high lake level stages.


Item Type:Article
Uncontrolled Keywords:Lacustrine sediments, Cyclostratigraphy, Paleoclimate, Miocene, Calatayud Basin
Subjects:Sciences > Geology > Stratigraphic geology
ID Code:61410
Deposited On:08 Jul 2020 11:34
Last Modified:08 Jul 2020 11:34

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