Sticky stuff: Redefining bedform prediction in modern and ancient environments

Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

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Sticky stuff: Redefining bedform prediction in modern and ancient environments. / Schindler, R.J.; Parsons, D.R.; Ye, L. et al.
Yn: Geology, 27.03.2015.

Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

HarvardHarvard

Schindler, RJ, Parsons, DR, Ye, L, Hope, JA, Baas, JH, Peakall, J, Manning, AJ, Aspden, RJ, Malarkey, J, Simmons, S, Paterson, DM, Lichtman, ID, Davies, AG, Thorne, PD & Bass, SJ 2015, 'Sticky stuff: Redefining bedform prediction in modern and ancient environments', Geology. https://doi.org/10.1130/G36262.1

APA

Schindler, R. J., Parsons, D. R., Ye, L., Hope, J. A., Baas, J. H., Peakall, J., Manning, A. J., Aspden, R. J., Malarkey, J., Simmons, S., Paterson, D. M., Lichtman, I. D., Davies, A. G., Thorne, P. D., & Bass, S. J. (2015). Sticky stuff: Redefining bedform prediction in modern and ancient environments. Geology. https://doi.org/10.1130/G36262.1

CBE

Schindler RJ, Parsons DR, Ye L, Hope JA, Baas JH, Peakall J, Manning AJ, Aspden RJ, Malarkey J, Simmons S, et al. 2015. Sticky stuff: Redefining bedform prediction in modern and ancient environments. Geology. https://doi.org/10.1130/G36262.1

MLA

VancouverVancouver

Schindler RJ, Parsons DR, Ye L, Hope JA, Baas JH, Peakall J et al. Sticky stuff: Redefining bedform prediction in modern and ancient environments. Geology. 2015 Maw 27. doi: 10.1130/G36262.1

Author

Schindler, R.J. ; Parsons, D.R. ; Ye, L. et al. / Sticky stuff: Redefining bedform prediction in modern and ancient environments. Yn: Geology. 2015.

RIS

TY - JOUR

T1 - Sticky stuff: Redefining bedform prediction in modern and ancient environments

AU - Schindler, R.J.

AU - Parsons, D.R.

AU - Ye, L.

AU - Hope, J.A.

AU - Baas, J.H.

AU - Peakall, J.

AU - Manning, A.J.

AU - Aspden, R.J.

AU - Malarkey, J.

AU - Simmons, S.

AU - Paterson, D.M.

AU - Lichtman, I.D.

AU - Davies, A.G.

AU - Thorne, P.D.

AU - Bass, S.J.

N1 - still no statement

PY - 2015/3/27

Y1 - 2015/3/27

N2 - The dimensions and dynamics of subaqueous bedforms are well known for cohesionless sediments. However, the effect of physical cohesion imparted by cohesive clay within mixed sand-mud substrates has not been examined, despite its recognized influence on sediment stability. Here we present a series of controlled laboratory experiments to establish the influence of substrate clay content on subaqueous bedform dynamics within mixtures of sand and clay exposed to unidirectional flow. The results show that bedform dimensions and steepness decrease linearly with clay content, and comparison with existing predictors of bedform dimensions, established within cohesionless sediments, reveals significant over-prediction of bedform size for all but the lowermost clay contents examined. The profound effect substrate clay content has on bedform dimensions has a number of important implications for interpretation in a range of modern and ancient environments, including reduced roughness and bedform heights in estuarine systems and the often cited lack of large dune cross-sets in turbidites. The results therefore offer a step change in our understanding of bedform formation and dynamics in these, and many other, sedimentary environments.

AB - The dimensions and dynamics of subaqueous bedforms are well known for cohesionless sediments. However, the effect of physical cohesion imparted by cohesive clay within mixed sand-mud substrates has not been examined, despite its recognized influence on sediment stability. Here we present a series of controlled laboratory experiments to establish the influence of substrate clay content on subaqueous bedform dynamics within mixtures of sand and clay exposed to unidirectional flow. The results show that bedform dimensions and steepness decrease linearly with clay content, and comparison with existing predictors of bedform dimensions, established within cohesionless sediments, reveals significant over-prediction of bedform size for all but the lowermost clay contents examined. The profound effect substrate clay content has on bedform dimensions has a number of important implications for interpretation in a range of modern and ancient environments, including reduced roughness and bedform heights in estuarine systems and the often cited lack of large dune cross-sets in turbidites. The results therefore offer a step change in our understanding of bedform formation and dynamics in these, and many other, sedimentary environments.

U2 - 10.1130/G36262.1

DO - 10.1130/G36262.1

M3 - Article

JO - Geology

JF - Geology

SN - 0091-7613

ER -