Comment on ‘Going with the flow: Experimental simulation of sediment transport from a foraminifera perspective’ by Ash‐Mor <i>et al</i>. (2022), <i>Sedimentology</i>, 69, 1231–1251

Reijmer, John J.G.

doi:10.1111/sed.13006

Cited by 2 publications

(3 citation statements)

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“…Yet, also siliciclastic and mixed carbonate–siliciclastic currents may transport a wide range of densities, as a result of multi‐mineral composition or due to the presence of porous bioclastic grains such as larger benthic foraminifera (e.g. Ash‐Mor et al ., 2022a, although the mechanisms initiating gravity flows remain a point of discussion: Reijmer, 2022; Ash‐Mor et al ., 2022b).…”

Section: Discussionmentioning

confidence: 99%

Shape‐dependent settling velocity of skeletal carbonate grains: Implications for calciturbidites

Slootman

Kruijf²,

Glatz

et al. 2023

Sedimentology

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Particle transport and deposition in turbidity currents is governed by the balance between turbulent suspension and gravitational settling, with settling velocity becoming dominant during the final rain‐out phases of decelerated turbidity currents on lobes. Differential particle settling velocities play a role in the sorting of grains in turbidity currents; there is a preference of grains with higher settling velocities to be deposited first, yielding a settling‐velocity gradient in vertical and longitudinal cross‐sections through turbidite beds. If sediments contain little variation in particle shape and density (for example, siliciclastics), then settling velocity is dominantly controlled by grain size. Carbonate sediments, in contrast, are composed of non‐skeletal and skeletal grains with various growth structures, producing a wide distribution of particle shapes (from spheroidal to platy, bladed and elongated forms). The present paper aims to constrain the extent to which shape‐dependent differential settling velocities influence sorting mechanisms in carbonate turbidity currents. Experiments using natural skeletal sand were conducted to investigate the settling of carbonate grains in: (i) isolation; (ii) suspension clouds; and (iii) turbidity currents. Size, density and shape parameters, including Corey Shape Factor and Zingg diagrams, were analysed using high‐resolution micro‐computed tomography. The slower settling of non‐spheroidal shapes was quantified. In the sinking suspensions, a sorting mechanism operated through differential velocities yielding an abundance of spheroidal grains at the base and enrichment in less‐spheroidal grains towards the top of suspension deposits. This trend was also observed longitudinally in carbonate turbidity currents, for which enhanced advection lengths caused less spheroidal grains to be transported farther into the basin. The effect of particle shape becomes increasingly significant as grain size increases, in particular above medium sand. Carbonate turbidites may therefore be more poorly sorted than siliciclastic turbidites, which is expected to result in lower primary porosity in calciturbidites compared to siliciclastic turbidites.

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Section: Discussionmentioning

confidence: 99%

Shape‐dependent settling velocity of skeletal carbonate grains: Implications for calciturbidites

Slootman

Kruijf²,

Glatz

et al. 2023

Sedimentology

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“…In the papers by Ash-Mor et al (2017, 2022, the objectives were: (i) to show that LBF can serve as a useful and reliable proxy for the identification of mass transport events; and (ii) to experiment the transport of LBF shells in order to study the sediment resuspension process and how it is expected to be reflected in the sedimentary record. These objectives were accomplished, but we state that further study is needed on more sedimentary records from the gulf in order to present the full palaeoseismic record along the southern extension of the Dead Sea Transform.…”

Section: The Question On the Seismic Triggermentioning

confidence: 99%

“…The introduction of the comment by Reijmer (2022) certainly describes the major aspects that were addressed in our paper and we thank him for his critical reading of our work. In our response, we refer to both the paper published in Sedimentology (Ash-Mor et al, 2022) and to Ash-Mor et al (2017), published in Marine Geology, because Reijmer's comments also refer to it.…”

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confidence: 95%

Reply to the Comment by John J. G. Reijmer on ‘Going with the flow: Experimental simulation of sediment transport from a foraminifera perspective’ by Ash‐Moret al. (2022), Sedimentology, 69, 1231–1251

et al. 2022

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Comment on ‘Going with the flow: Experimental simulation of sediment transport from a foraminifera perspective’ by Ash‐Mor et al. (2022), Sedimentology, 69, 1231–1251

Cited by 2 publications

References 55 publications

Shape‐dependent settling velocity of skeletal carbonate grains: Implications for calciturbidites

Shape‐dependent settling velocity of skeletal carbonate grains: Implications for calciturbidites

Reply to the Comment by John J. G. Reijmer on ‘Going with the flow: Experimental simulation of sediment transport from a foraminifera perspective’ by Ash‐Moret al. (2022), Sedimentology, 69, 1231–1251

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