Millennial/submillennial-scale sea-level fluctuations in western Mediterranean during the second highstand of MIS 5e |
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| Authors: | CJ Dabrio C Zazo A Cabero JL Goy T Bardají C Hillaire-Marcel JA González-Delgado J Lario PG Silva F Borja AM García-Blázquez |
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| Institution: | 1. Departamento de Estratigrafía and Instituto de Geología Económica, (UCM-CSIC) Facultad de Ciencias Geológicas, Universidad Complutense de Madrid, Calle José Antonio Nováis 2, 28040 Madrid, Spain;2. Departamento de Geología, Museo Nacional de Ciencias Naturales, CSIC, Madrid, Spain;3. Facultad de Ciencias, UNED Madrid, Spain;4. Departamento de Geología, Universidad de Salamanca, Spain;5. Departamento de Geología, Universidad de Alcalá Madrid, Spain;6. GEOTOP-UQAM, Canada;7. Área de Geografía Física, Facultad de Humanidades, Universidad de Huelva, Spain;1. Institute of Nuclear Sciences, Ankara University, 06100 Be?evler, Ankara, Turkey;2. Physics Department, McDaniel College, Westminster, MD 21157, USA;3. Nuclear Physics Laboratory, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece;1. Departamento de Biología, Área de Ecología, Facultad de Ciencias del Mar y Ambientales, Universidad de Cádiz, Campus Universitario 11510 Puerto Real, Cádiz, Spain;2. European Commission, Joint Research Center, Institute for Environment and Sustainability, Via E. Fermi 2749, 21027 Ispra, Italy;3. Departamento de Física Aplicada, Facultad de Ciencias del Mar y Ambientales, Universidad de Cádiz, 11510 Puerto Real, Cádiz, Spain;1. College of Energy Engineering, Huanghuai University, Zhumadian, 463000, Henan, China;2. Henan Provincial Key Laboratory of Smart Lighting, Huanghuai University, Zhumadian, 463000, China;3. State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials, South China University of Technology, Guangzhou, 510640, China;4. College of Material Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China;5. College of Rare Earths, Jiangxi University of Science and Technology, Ganzhou, 341000, China;1. Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Ciencias Geológicas, Ciudad Universitaria, Pabellón II, Intendente Güiraldes 2160, C1428EHA, Ciudad Autónoma de Buenos Aires, Argentina;2. CONICET-Universidad de Buenos Aires, Instituto de Geociencias Básicas, Ambientales y Aplicadas de Buenos Aires (IGeBA), Argentina;3. Shell Exploration and Production Incorporated, Shell Houston Technology Center, 3333 Highway 6 South, Houston, TX 77082, USA;1. School of Geography and Tourism, Jiaying University, Meizhou, Guangdong, 514015, China;2. State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, 730000, China;3. School of Earth Sciences, China University of Geosciences, Wuhan, 430074, China;4. School of Geographical Science, South China Normal University, Guangzhou, 510631, China;5. Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China |
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| Abstract: | This paper investigates a series of small-scale, short-lived fluctuations of sea level registered in a prograding barrier spit that grew during the MIS 5e. This interglacial includes three highstands (Zazo et al., 2003) and we focus on the second highstand, of assumed duration ～10 ± 2 ka, given that U–Th ages do not provide more accurate data. Geometry and 3D architecture of beach facies, and thin-section petrography were used to investigate eight exposed offlapping subunits separated by seven conspicuous erosion surfaces, all interpreted as the result of repeated small-scale fluctuations of sea level.Each subunit records a relatively rapid rise of sea level that generated a gravelly shoreface with algal bioherms and a sandy uppermost shoreface and foreshore where most sand accumulated. A second range of still smaller-scaled oscillations of sea level has been deduced in this phase of sea-level fluctuation from lateral and vertical shifts of the foreshore-plunge-step-uppermost shoreface facies.Eventually, progradation with gently falling sea level took place and foreshore deposits underwent successive vadose cementation and subaerial dissolution, owing to relatively prolonged exposure. Later recovery of sea level re-established the highstand with sea level at approximately the same elevation, and there began deposition of a new subunit. The minimum sea-level variation (fall and subsequent rise) required to generate the observed features is 4 m. The time span available for the whole succession of events, and comparison with the Holocene prograding beach ridge complex in the nearby Roquetas (Almería) were used to calculate the periodicity of events. A millennial-suborbital time scale is suggested for fluctuations separating subunits and a decadal scale for the minor oscillations inside each subunit. |
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