Micropaleontological and taphonomic characteristics of mass transport deposits in the northern Gulf of Eilat/Aqaba, Red Sea

Ash-Mor, Anat; Bookman, Revital; Kanari, Mor; Ben‐Avraham, Zvi; Almogi‐Labin, Ahuva

doi:10.1016/j.margeo.2017.07.009

Cited by 18 publications

(55 citation statements)

References 46 publications

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“…Multiple taxonomic references were used (d 'Orbigny, 1826'Orbigny, , 1839Williamson, 1858;Jones and Parker, 1860;Parker and Jones, 1865;Brady, 1878Brady, , 1879Brady, , 1884Cushman, 1922Cushman, , 1923Cushman, , 1927Stewart and Stewart, 1930;Phleger and Parker, 1951;Parker et al, 1953;Parker, 1954). The number of specimens with visibly fractured tests was counted and reported as the fracture percentage versus the total number of specimens identified as a taphonomical indicator of turbulent flow redistribution (Ash-Mor et al, 2017).…”

Section: Benthic Foraminiferamentioning

confidence: 99%

Resuspension, Redistribution, and Deposition of Oil-Residues to Offshore Depocenters After the Deepwater Horizon Oil Spill

et al. 2021

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The focus of this study was to determine the long-term fate of oil-residues from the 2010 Deepwater Horizon (DwH) oil spill due to remobilization, transport, and re-distribution of oil residue contaminated sediments to down-slope depocenters following initial deposition on the seafloor. We characterized hydrocarbon residues, bulk sediment organic matter, ease of resuspension, sedimentology, and accumulation rates to define distribution patterns in a 14,300 km2 area southeast of the DwH wellhead (1,500 to 2,600 m water depth). Oil-residues from the DwH were detected at low concentrations in 62% of the studied sites at specific sediment layers, denoting episodic deposition of oil-residues during 2010–2014 and 2015–2018 periods. DwH oil residues exhibited a spatial distribution pattern that did not correspond with the distribution of the surface oil slick, subsurface plume or original seafloor spatial expression. Three different regions were apparent in the overall study area and distinguished by the episodic nature of sediment accumulation, the ease of sediment resuspension, the timing of oil-residue deposition, carbon content and isotopic composition and foram fracturing extent. These data indicate that resuspension and down-slope redistribution of oil-residues occurred in the years following the DwH event and must be considered in determining the fate of the spilled oil deposited on the seafloor.

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Section: Benthic Foraminiferamentioning

confidence: 99%

Resuspension, Redistribution, and Deposition of Oil-Residues to Offshore Depocenters After the Deepwater Horizon Oil Spill

et al. 2021

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“…These results strengthen the conclusion that a minimum current velocity of ca 80 cm s −1 was required in order to transport large quantities of specimens of this size beyond the GEA shelf edge and down the continental slope. Indeed, O. ammonoides specimens >1 mm are highly abundant in the medium‐scale and large‐scale turbidites found in the GEA slope (Ash‐Mor et al ., 2017). Although higher velocities eventually wane as well, the initial amount and grain size of the material carried by such a current is greater and has the potential to travel farther down slope.…”

Section: Discussionmentioning

confidence: 99%

“…In addition, shell erosion is time‐dependent and will further deteriorate as flow duration continues. This experiment was designed to understand sediment transport processes in the GEA where the transport distance from the source (shelf) to the deposition sites (continental slope) ranges between ca 0.75 to 3.7 km (Ash‐Mor, et al ., 2017). However, turbidity currents can occur as a single event or several subsequent events that last from an hour to several days.…”

Section: Discussionmentioning

confidence: 99%

“…According to the study of Ash-Mor et al (2017), the occurrence of A. papillosa and O. ammonoides in the GEA turbidites is related to the source area which was concluded as the deeper shelf area. In addition, the absence of shallow water LBF species in these turbidites was attributed to the presence of Halophila meadows and coral reefs serving as a physical barrier.…”

Section: Species Shell Shapementioning

confidence: 99%

“…For instance, Japan is frequently affected by earthquakes and tropical storms (Yordanova & Hohenegger, 2002;Sugawara et al, 2009), while in Italy turbidites are essentially a combination of high sedimentation rate, due to river discharge, and tectonic activity occurrence (Polonia et al, 2015). Turbidites were previously described by Ash-Mor et al (2017) in sediment cores collected from the continental slope of the tectonically active Gulf of Eilat/Aqaba (GEA). These deposits were identified as turbidites due to their graded bedding character, typical for this type of deposit.…”

Section: Introductionmentioning

confidence: 99%

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Going with the flow: Experimental simulation of sediment transport from a foraminifera perspective

et al. 2021

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Transport of continental shelf sediments to the deep ocean can be studied from displaced symbiont-bearing larger benthic foraminifera found in turbidity current deposits. The larger benthic foraminifera habitat depth, physical characteristics and preservation serve as indicators for understanding sediment transport dynamics near the seabed and in the water column. Here, an experiment was designed to explore sediment transport in a closed flume system using simulated high current velocities. Shelf sediments from the Gulf of Eilat/Aqaba, dominated by Amphistegina papillosa and Operculina ammonoides, were subjected to 60 cm s −1 and 80 cm s −1 current velocities while collected in a 10 cm vertical sediment trap. Larger benthic foraminifera abundance, shell physical properties and preservation were analyzed and compared with the original bulk sediments. The experiment results showed that at 80 cm s −1 velocity, larger benthic foraminifera shells of all sizes and preservations are efficiently resuspended and transported in large quantities throughout the water column, as opposed to their transport as bedload by the lower velocity current. Larger benthic foraminifera shape also has a role in the transport distances and accumulation depths. Operculina ammonoides shells were found to be more portable, compared to Amphistegina papillosa, due to their flatter discoid shape. The results suggest that a threshold velocity of ca 80 cm s −1 was needed to generate the thick coarse deposits found in the Gulf of Eilat/Aqaba slope sedimentary record, which were previously suggested to be triggered by large magnitude seismic events. Lower velocities probably winnowed minor amounts of larger benthic foraminifera shells (with little or no coarser sediments) that were deposited as a thin sand layer may point to lower magnitude seismic triggers. In conclusion, larger benthic foraminifera shells are transported and deposited in accordance with their hydrodynamic properties, resulting in assemblage differentiation along the transport 1231

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Early Cretaceous calciturbidites facies from Zagros Fold–Thrust belt: a key to paleogeography and environment of northeast Arabian Platform Passive Margin, examples from Kurdistan Region, Northeast Iraq

Karim

2020

Carbonates Evaporites

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Micropaleontological and taphonomic characteristics of mass transport deposits in the northern Gulf of Eilat/Aqaba, Red Sea

Cited by 18 publications

References 46 publications

Resuspension, Redistribution, and Deposition of Oil-Residues to Offshore Depocenters After the Deepwater Horizon Oil Spill

Resuspension, Redistribution, and Deposition of Oil-Residues to Offshore Depocenters After the Deepwater Horizon Oil Spill

Going with the flow: Experimental simulation of sediment transport from a foraminifera perspective

Early Cretaceous calciturbidites facies from Zagros Fold–Thrust belt: a key to paleogeography and environment of northeast Arabian Platform Passive Margin, examples from Kurdistan Region, Northeast Iraq

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