Magnetobiochronology of Lower Pliocene marine sediments from the lower Guadalquivir Basin: Insights into the tectonic evolution of the Strait of Gibraltar area

Pérez-Asensio, José N.; Larrasoaña, Juan C.; Samankassou, Elias; Sierro, Francisco J.; García‐Castellanos, Daniel; Jiménez‐Moreno, Gonzalo; Salazar, Ángel; Salvany, Josep Maria; Ledesma, Santiago; Mata, Pilar; Civis, Jorge; Ávila-Mediavilla, Carlos Marcelo

doi:10.1130/b31892.1

Cited by 7 publications

(8 citation statements)

References 65 publications

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“…The middle to late Messinian and lowermost Pliocene sediments could also be truncated by younger lower Pliocene gravity flow deposits, either channel-filled turbidites, debrites or slope fans originating from the margins (~ 5.2-3.8 Ma) (Ducassou et al 2016;Sierro et al 2008). They are caused by compressional tectonics superimposed upon glacio-eustatic variation (Pérez-Asensio et al 2018;Sierro et al 2008).…”

Section: Stratigraphic and Sedimentary Interpretationmentioning

confidence: 99%

Latest Miocene restriction of the Mediterranean Outflow Water: a perspective from the Gulf of Cádiz

Hernández-Molina

Duarte

et al. 2021

Geo-Mar Lett

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The Mediterranean-Atlantic water mass exchange provides the ideal setting for deciphering the role of gateway evolution in ocean circulation. However, the dynamics of Mediterranean Outflow Water (MOW) during the closure of the Late Miocene Mediterranean-Atlantic gateways are poorly understood. Here, we define the sedimentary evolution of Neogene basins from the Gulf of Cádiz to the West Iberian margin to investigate MOW circulation during the latest Miocene. Seismic interpretation highlights a middle to upper Messinian seismic unit of transparent facies, whose base predates the onset of the Messinian salinity crisis (MSC). Its facies and distribution imply a predominantly hemipelagic environment along the Atlantic margins, suggesting an absence or intermittence of MOW preceding evaporite precipitation in the Mediterranean, simultaneous to progressive gateway restriction. The removal of MOW from the Mediterranean-Atlantic water mass exchange reorganized the Atlantic water masses and is correlated to a severe weakening of the Atlantic Meridional Overturning Circulation (AMOC) and a period of further cooling in the North Atlantic during the latest Miocene.

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Section: Stratigraphic and Sedimentary Interpretationmentioning

confidence: 99%

Latest Miocene restriction of the Mediterranean Outflow Water: a perspective from the Gulf of Cádiz

Hernández-Molina

Duarte

et al. 2021

Geo-Mar Lett

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“…The weight of this slab can also explain the subsidence and tilting of the Guadalquivir basement during and after the upper Miocene (Garcia-Castellanos et al, 2002;Pérez-Asensio et al, 2018). In Iberia, regions of crustal thickness of~40 km correspond to areas higher than 1,000 m, as, for example, in the Pyrenees .…”

Section: 1029/2019jb018445mentioning

confidence: 96%

Deep seated density anomalies across the Iberia-Africa plate boundary and its topographic response

Jiménez‐Munt

Torné

Fernández

et al. 2020

Preprint

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<p>The modes in which the lithosphere deforms during continental collision and the mechanisms involved are not well understood. While continental subduction and mantle delamination are often invoked in tectonophysical studies, these processes are difficult to be confirmed in more complex tectonic regions such as the Gibraltar Arc. We study the present-day density and compositional structure of the lithosphere along a transect running from S Iberia to N Africa crossing the western Gibraltar Arc. This region is located in the westernmost continental segment of the African-Eurasian plates, characterized by a diffuse transpressive plate boundary. An integrated and self-consistent geophysical-petrological methodology is used to model the lithosphere structure variations and the thermophysical properties of the upper mantle. The crustal structure is mainly constrained by seismic experiments and geological data, whereas the composition of the lithospheric mantle is constrained by xenolith data. The results show large lateral variations in the topography of the lithosphere-asthenosphere boundary (LAB). We distinguish different chemical lithospheric mantle domains that reproduce the main trends of the geophysical observables and the modelled P- and S-wave seismic velocities. A sublithospheric body colder than the surrounding mantle is needed beneath the Betics-Rif to adjust the measured potential fields. We link this body to the Iberian slab localized just to the east of the profile and having some effect on the geoid and Bouguer anomalies. Local isostasy allows explaining most of the topography, but an elastic thickness higher than 10 km is needed to explain local misfits between the Atlas and the Rif Mountains. This work has been supported by Spanish Ministry by the projects MITE (CGL2014-59516) and GeoCAM (PGC2018-095154-B-100).</p>

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“…2013; Pérez‐Asensio et al . 2013, 2018). In shallow marine environments, different sedimentary shore‐line markers such as coral‐reefs, beach deposits and coastal rocks bored by organisms can be used to infer sea‐level position over geological time (Braga et al .…”

Section: Figmentioning

confidence: 99%

“…2011; Pérez‐Asensio et al . 2018). The four marine units are the Niebla (late Tortonian), Gibraleón (latest Tortonian – Messinian), Huelva (early Pliocene) and Bonares (early Pliocene) formations.…”

Section: Geological and Palaeogeographical Settingmentioning

confidence: 99%

Quantitative palaeobathymetric reconstructions based on foraminiferal proxies: a case study from the Neogene of south‐west Spain

Pérez-Asensio

2021

Palaeontology

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Quantitative palaeobathymetric reconstructions based on foraminiferal proxies have been used in a wide variety of geological studies on tectonic, climatic and environmental changes in sedimentary basins. However, palaeo‐water‐depth estimates are frequently biased due to taphonomic processes (dissolution, transport) as well as local conditions (primary productivity, oxygen content, and organic matter fluxes). This study evaluated the level of reliability of three commonly used transfer equations based on planktic and benthic foraminiferal proxies that produce different palaeobathymetric results, using Neogene sediments from the Guadalquivir Basin, south‐west Spain. The most trustworthy method involves removing abundant infaunal benthic foraminifera before applying the palaeo‐water‐depth equation based on benthic foraminiferal water‐depth ranges and presence/absence of species. This new approach provides sound palaeobathymetric results that improve estimations of long and short‐term relative sea‐level changes with negligible influence of taphonomic as well as ecological factors. When using one equation based on planktic/benthic ratios (P/B ratios), removing all infaunal benthic foraminiferal species improves the accuracy of P/B ratios, which yields more accurate palaeodepth reconstructions despite the low level of trustworthiness of this equation for both long and short‐term relative sea‐level variations.

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Magnetobiochronology of Lower Pliocene marine sediments from the lower Guadalquivir Basin: Insights into the tectonic evolution of the Strait of Gibraltar area

Cited by 7 publications

References 65 publications

Latest Miocene restriction of the Mediterranean Outflow Water: a perspective from the Gulf of Cádiz

Latest Miocene restriction of the Mediterranean Outflow Water: a perspective from the Gulf of Cádiz

Deep seated density anomalies across the Iberia-Africa plate boundary and its topographic response

Quantitative palaeobathymetric reconstructions based on foraminiferal proxies: a case study from the Neogene of south‐west Spain

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