Late Miocene evolution of the eastern Deep Algarve basin: Interaction of bottom currents and gravitational processes in a foredeep setting

Ng, Zhi Lin; Hernández-Molina, F. Javier; Ledesma, Santiago; Sierro, Francisco Javier; Duarte, Débora; Llave, Estefanía; Roque, Cristina; Arnaiz, Á.

doi:10.1016/j.marpetgeo.2022.105695

Cited by 4 publications

(5 citation statements)

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“…During deposition of Units III and II in the latest Messinian-Early Pliocene (5.78 to >4.52 Ma), an important change in the depositional style with respect to Unit IV took place, with the development of hemipelagic deposits, and with very occasional, very fine grained turbidites not affected by bottom currents. This result agrees with the previous interpretation for the upper part of the Messinian in the Gulf of Cádiz that proposed hemipelagic sedimentation during the late Messinian and no significant MOW influx during the earliest Pliocene (e.g., Llave et al, 2011;Expedition 339 Scientists, 2013;Hernández-Molina et al, 2016), but at Site U1610 it appears that this change happened earlier than previously documented based on seismic data from the same area (Ng et al, 2022). However, this hypothesis for the lack of bottom water current reworking and contourite deposition is contrary to other authors who consider a MOW influence since the Miocene/Pliocene boundary (e.g., Nelson et al, 1999).…”

Section: Lithostratigraphysupporting

confidence: 92%

“…Expedition 339 drilled the top of the MTU at Site U1387 and recovered hemipelagic sediments (Expedition 339 Scientists, 2013). Beneath this we anticipated a migrating channel fill succession, below which is an unconformity and a succession of dipping bright reflectors (Ng et al, 2022). Beneath this is a package of parallel-bedded, lower amplitude reflectors that is thought to be of Tortonian age.…”

Section: Site U1610mentioning

confidence: 98%

“…Site U1610 is located in the Deep Algarve Basin of the Gulf of Cádiz (Ng et al, 2022). Based on regional correlations to Expedition 339 sites and industry wells, the Late Miocene seismic stratigraphic sequence at the site location was divided into four distinct stages, charting the progradation of a submarine fan (channel/levee/lobes system) influenced by bottom currents.…”

Section: Site U1610mentioning

confidence: 99%

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Expedition 401 Preliminary Report: Mediterranean–Atlantic Gateway Exchange

Flecker,

Ducassou,

Williams

2024

International Ocean Discovery Program Preliminary Report

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Marine gateways play a critical role in the exchange of water, heat, salt, and nutrients between oceans and seas. Changes in gateway geometry can significantly alter both the pattern of global ocean circulation and climate. Today, the volume of dense water supplied by Atlantic-Mediterranean exchange through the Gibraltar Strait is among the largest in the global ocean. For the past 5 My, this overflow has generated a saline plume at intermediate depths in the Atlantic that deposits distinctive contouritic sediments and contributes to the formation of North Atlantic Deep Water. This single gateway configuration only developed in the Early Pliocene. During the Miocene, two narrow corridors linked the Mediterranean and Atlantic: one in northern Morocco and the other in southern Spain. Formation of these corridors followed by progressive restriction and closure resulted in extreme salinity fluctuations in the Mediterranean, leading to the precipitation of the Messinian Salinity Crisis salt giant. International Ocean Discovery Program (IODP) Expedition 401 is the offshore drilling component of a Land-2-Sea drilling proposal, Investigating Miocene Mediterranean-Atlantic Gateway Exchange (IMMAGE). Its aim is to recover a complete record of Atlantic-Mediterranean exchange from its Late Miocene inception to its current configuration by targeting Miocene offshore sediments on either side of the Gibraltar Strait. Miocene cores from the two precursor connections now exposed on land will be obtained by future International Continental Scientific Drilling Program (ICDP) campaigns.

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Section: Lithostratigraphysupporting

confidence: 92%

Section: Site U1610mentioning

confidence: 98%

Section: Site U1610mentioning

confidence: 99%

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Expedition 401 Preliminary Report: Mediterranean–Atlantic Gateway Exchange

Flecker,

Ducassou,

Williams

2024

International Ocean Discovery Program Preliminary Report

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“…Disruption of the connection between the Mediterranean Sea and the Atlantic led the Mediterranean to become a marginal sea (Flecker et al, 2015). Between ~ 11.6 and 7.2 Ma, following the convergent phase, two main corridors formed south of Spain (Betic) and north of Morocco (Rifean) to allow MOW overflow into the Atlantic (Capella et al, 2017(Capella et al, , 2019Krijgsman et al, 1999;de Weger et al, 2020Ng et al, 2021Ng et al, , 2022. During the late Messinian, shallowing/closure of these corridors produced the Messinian Salinity Crisis (MSC) between 5.97 and 5.33 Ma, and associated late Miocene cooling (Hsü et al, 1973;CIESM, 2008;Roveri et al, 2014;Flecker et al, 2015;Herbert et al, 2016;Krijgsman et al, 1999).…”

Section: Middle To Late Miocene: Indian Gateway Closure and The Incep...mentioning

confidence: 99%

Eocene to middle Miocene contourite deposits in Cyprus: A record of Indian Gateway evolution

Hernández-Molina

Hüneke

Rodrı́guez-Tovar

et al. 2022

Global and Planetary Change

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“…During the MSC, a complex combination of tectonic activity and/or changes in the glacio‐eustatic sea level led to the progressive isolation of the Mediterranean Sea and, once isolated, was very sensitive on the rainfall input. As a result of the MSC, the Mediterranean Outflow Water (MOW) influx into the Atlantic Ocean was severely reduced or ceased (Ng et al., 2022) allowing the formation of a hypersaline deposits (gypsum and halite, salinity >360 g/kg) from ∼5.9 to ∼5.6 Ma (Roveri et al., 2014). This restriction is suggested to have slowed down the Atlantic Meridional Overturning Circulation (AMOC) by ∼15% (Rogerson et al., 2012) as MOW provides considerable amounts of the salinity needed for the formation of North Atlantic Deep Water.…”

Section: Introductionmentioning

confidence: 99%

Orbital Forcing and Evolution of the Southern African Monsoon From Late Miocene to Early Pliocene

de Azevedo,

Jiménez‐Espejo,

Bulian

et al. 2023

Paleoceanog and Paleoclimatol

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The late Miocene ‐ early Pliocene (7.4 ‐ 4.5 Ma) is a key interval in Earth’s history where intense reorganization of atmospheric and ocean circulation occurred within a global cooling scenario. The southern African monsoon (SAFM) potentially played an important role in climate systems variability during this interval. However, the dynamics of this important atmospheric system is poorly understood due to the scarcity of continuous records. Here, we present an exceptional continuous late Miocene to early Pliocene reconstruction of SAFM based on elemental geochemistry (Ca/Ti and Si/K ratios), stable isotope geochemistry (δ18O and δ13C recorded in the planktonic foraminifera Orbulina universa), and marine sediment grain size data from the International Ocean Discovery Program (IODP) Site U1476 located at the entrance of the Mozambique Channel. Spectral characteristics of the Si/K ratio (fluvial input) was used to identify the main orbital forcing controlling SAFM. Precession cycles governed precipitation from 7.4 to ∼6.9 Ma and during the early Pliocene. From ∼6.9 to ∼5.9 Ma, the precession and long eccentricity cycles drove the SAFM. The major Antarctic ice sheet expansion across this interval appear to influence the isotopic records of Orbulina universa imprinting its long‐term variability signal as a response to the ocean and atmospheric reorganization. Precession cycles markedly weakened from 5.9 to 5.3 Ma, almost the same period when the Mediterranean Outflow Water ceased. These findings highlight important teleconnections among the SAFM, Mediterranean Sea, and other tropical regions.This article is protected by copyright. All rights reserved.

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Late Miocene evolution of the eastern Deep Algarve basin: Interaction of bottom currents and gravitational processes in a foredeep setting

Cited by 4 publications

References 85 publications

Expedition 401 Preliminary Report: Mediterranean–Atlantic Gateway Exchange

Expedition 401 Preliminary Report: Mediterranean–Atlantic Gateway Exchange

Eocene to middle Miocene contourite deposits in Cyprus: A record of Indian Gateway evolution

Orbital Forcing and Evolution of the Southern African Monsoon From Late Miocene to Early Pliocene

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