Hemipelagic Advection and Periplatform Sedimentation

Henrich, Rüdiger; Hüneke, Heiko

doi:10.1016/b978-0-444-53000-4.00005-6

Cited by 15 publications

(10 citation statements)

References 127 publications

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“…2 and 3), imply dominant deposition of hemipelagic settling in the absence of alongslope transport. A higher estimated rate of accumulation (5.2-17.5 cm ka −1 ) compared to the average hemipelagic sedimentation rate (2 cm ka −1 , McCave and Hall 2006) could be due to a higher influx of allochthonous terrigenous material on the continental slopes (Henrich and Hüneke 2011). Higher sedimentation rates within the intraslope basins, such as the eastern Deep Algarve (Fig.…”

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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“…Facies F2 Facies F2b resembles that of F2a, although the former takes on a greenish colour due to its illite (and quartz) content of up to 3%. Alteration and weathering of the mafic Troodos body (Eaton and Robertson, 1993) would be a potential source of very fine grain siliciclastic particles transported basinwards over long distances as sediment in suspension through nepheloid layers (Henrich and Hüneke, 2011). Bottom currents could then redistribute this material (e.g., Pudsey and Camerlenghi, 1998;Lucchi and Rebesco, 2007;Stow and Faugères, 2008;Rodrigues et al, 2022c).…”

Section: Facies F2 (Calcilutites)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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“…They form in both subaerial and subaqueous environments, and are considered to document spatial and temporal variations in palaeoclimates and tectonics in both hinterlands and sedimentary basins (Kronberg et al ., 1986; Thiry, 2000). Hemipelagic and pelagic muddy sediments cover more than 50% of Earth's surface (Garrison, 1990), and they have commonly played an important role as a proxy for spatial and temporal variations of palaeoclimates and tectonics, with the assumption that they have approximately constant sedimentation rates (Beattie & Dade, 1996; Henrich & Hüneke, 2011). The definition, discrimination and formation processes of hemipelagic and pelagic muddy sediments have been discussed elsewhere (Hsü & Jenkyns, 1974; Rupke & Stanley, 1974; Stow & Piper, 1984; Sawada et al ., 1996; Wetzel & Uchman, 2012; Ochoa et al ., 2013).…”

Section: Introductionmentioning

confidence: 99%

“…Hemipelagic muddy sediments (i.e. hemipelagites) are widely distributed on continental margins; approximately 90% of the sediments on these margins are generated by weathering and erosion of rocks on lands (Potter et al ., 2005; Henrich & Hüneke, 2011). Therefore, detailed analyses of hemipelagites are crucial to elucidate the interactions between the relative contributions of continental‐derived and marine‐derived sediments on continental margins.…”

Section: Introductionmentioning

confidence: 99%

“…Lateral advection is a complex interplay between different settling behaviours of fine‐grained particles from low‐density turbidity currents, nepheloid layers, midwater suspension, and bottom currents (Stow & Tabrez, 1998; Stow & Smillie, 2020). Hemipelagic sedimentation has been commonly considered to be continuous, and constant sedimentation rates have been assumed to calculate recurrence intervals of turbidites (Beattie & Dade, 1996; Henrich & Hüneke, 2011). In addition, one‐dimensional (i.e.…”

Section: Introductionmentioning

confidence: 99%

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Downslope variation in hemipelagic sedimentation in an active margin basin: An example from the lower Pleistocene Kiwada and Takamizo formations on the Boso Peninsula, Japan

et al. 2022

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Hemipelagites are widespread fine-grained sediments found from shelf margin to deep-water environments, and they are considered to have been formed as background sedimentation by vertical settling and slow lateral advection of clastic and biogenic fine-grained particles. Downflow variation in hemipelagic sedimentation, however, is not yet clearly understood, and was investigated in the lower Pleistocene Kiwada and Takamizo formations in the Kazusa forearc basin on the Boso Peninsula, Japan. Mapping of three tephra key beds enabled detailed correlation of two hemipelagite beds over a distance of ca 30 km from shelf-margin to basin-plain environments. The sedimentation rates decreased gradually in the downslope direction, but increased locally in response to turbidite sedimentation. This downslope variation indicates that hemipelagic sedimentation is not necessarily constant and varies in response to progradation and retrogradation of deepwater depositional systems, as well as additional input of fine-grained sediments from turbidity currents. In contrast, the grain size, magnetic susceptibility, clay-mineral composition, total organic carbon contents relative to total nitrogen contents (carbon/nitrogen), and d 13 C values of organic carbon do not exhibit distinct downslope variation. This downslope consistency indicates that hemipelagites document temporal perturbations of geological and palaeoclimatic conditions in hinterlands, regardless of spatial and temporal variations in deep-water depositional environments. The concentrations of total organic carbon, total nitrogen and five biomarkers were lower values in turbiditic mudstones and hemipelagites that formed above a turbidite bed than in those of the other hemipelagites. This variation suggests that an additional supply of fine-grained sediments from turbidity currents likely diluted the organic matter in the hemipelagites. In addition, hemipelagites for which deposition was affected by turbidity currents exhibit slightly lower d 13 C values, and may also document an additional contribution of terrestrial organic matter from turbidity currents.

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Hemipelagic Advection and Periplatform Sedimentation

Cited by 15 publications

References 127 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

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

Downslope variation in hemipelagic sedimentation in an active margin basin: An example from the lower Pleistocene Kiwada and Takamizo formations on the Boso Peninsula, Japan

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