Zooming into the Mediterranean outflow fossil moat during the 1.2–1.8 million years period (Early-Pleistocene): an approach by radiogenic and stable isotopes

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dc.contributor.author Martín Lebreiro, Susana
dc.contributor.author Antón López, Laura Ángela
dc.contributor.author Reguera García, M. Isabel
dc.contributor.author Fernández Díaz, Marta
dc.contributor.author Conde Vilda, Estefanía
dc.contributor.author Barrado Olmedo, Ana I.
dc.contributor.author Yllera de Llano, Abel
dc.date.accessioned 2020-12-15T05:16:44Z
dc.date.available 2020-12-15T05:16:44Z
dc.date.issued 2015-12
dc.identifier.citation Global and Planetary change (2015), v.135, p.104-118 es_ES
dc.identifier.issn 1872-6364
dc.identifier.uri http://hdl.handle.net/20.500.12468/710
dc.description.abstract The fossil Alvarez Cabral erosive Moat contains hemipelagite, contourite and turbidite facies where oceanography changes in the Mediterranean outflow are archived over the 1.2-1.8 Myr time period. Here we used Pb and Sr radiogenic isotopes to trace water masses and sediment source changes, for the first time in twenty glacial-interglacial (G-I) cycles of the Early-Pleistocene interval, and the last Glacial Maximum through Holocene cycle (including the Younger Dryas and Heinrich Stadial-1). A mixing line of Pb isotopes gives reliable low radiogenic 208Pb/204Pb, 206Pb/204Pb, and 206Pb/207Pb typical of Mediterranean Outflow Water (MOW) in one end-member and the signature of high radiogenic isotopes of Atlantic Waters (AW) towards the second endmember. The 87Sr/86Sr isotopes also display two end-members of the mixing line between eolian transport/dust source (0.71) and fluvial transport/weathering source (0.73) previously proposed in the Gulf of Cadiz. Combination of Pb and Sr radiogenic isotopes with O and C stable isotopes of planktonic and benthic foraminifera, and the response of foraminifera benthos over the Early-Pleistocene interval, reveals a direct link between water masses circulation and shifts in G-I. We found a persistent cyclic pattern of MOW circulation and fluvial deposition during glaciations and AW and aeolian influence during interglaciations. On site U1386B/C, the upper-MOW was less ventilated but productive and with high flux of organic flux matter during glacials, while Atlantic Waters were better ventilated, enriched in O, but less productive during interglacials. We infer that shifts in ocean and atmospheric processes in the Gulf of Cadiz were strongly controlled by Earth´s obliquity (41kyrcycle) and 35ºNH insolation during the Early-Pleistocene. We propose a correlation in changes in phase-relationship between precession and obliquity. es_ES
dc.description.sponsorship Instituto Geológico y Minero de España, España es_ES
dc.description.sponsorship Sede de Tres Cantos, Instituto Geológico y Minero de España, España es_ES
dc.description.sponsorship Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, España es_ES
dc.language.iso en es_ES
dc.publisher Elsevier es_ES
dc.relation CONTOURIBER (CTM2008-06399-CO4-02/MAR) es_ES
dc.relation MOWER (CTM2012-39599-C03-03). es_ES
dc.relation Euromargins MVSEIS project (01-LEC-EMA24F, REN2002-11669-E-MAR) es_ES
dc.rights Acceso abierto es_ES
dc.subject Pb-Sr isotopes es_ES
dc.subject O-C isotopes es_ES
dc.subject Early-Pleistocene es_ES
dc.subject LGM-Holocene es_ES
dc.subject Gulf Cadiz es_ES
dc.subject obliquity es_ES
dc.title Zooming into the Mediterranean outflow fossil moat during the 1.2–1.8 million years period (Early-Pleistocene): an approach by radiogenic and stable isotopes es_ES
dc.type Preprint es_ES
dc.relation.publisherversion https://www.sciencedirect.com/science/article/abs/pii/S0921818115300898#! es_ES
dc.description.funder Secretaría de Estado de Investigación, Desarrollo e Innovación, España es_ES
dc.description.funder European Science Foundation es_ES
dc.identifier.doi https://doi.org/10.1016/j.gloplacha.2015.10.010 es_ES
dc.coverage.spatialStudy Golfo de Cádiz, Mar Mediterráneo es_ES

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