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Kinematic controls on the geometry of the preserved cross sets

Ganti, Vamsi and Paola, Chris and Foufoula-Georgiou, Efi (2013) Kinematic controls on the geometry of the preserved cross sets. Journal of Geophysical Research. Earth Surface, 118 (3). pp. 1296-1307. ISSN 2169-9003.

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The geometry of sedimentary strata records the dynamics of the surfaces that produced them. Cross strata are one of the most common features preserved in the stratigraphic record and are typically formed by migrating ripples, dunes, and bars. Cross-stratal geometry depends on the movement and shape of the bed forms. In this study, we provide theoretical relationships that map the statistics of surface kinematics and geometry of migrating bed forms into the 2-D geometrical structure of the preserved stratigraphy. The surface kinematics is characterized by the migration (translation of the waveforms) and deformation (change in shape of the waveforms) of the bed forms. We show that, for transverse, unidirectional bed forms, the local slope and curvature of the preserved stratigraphic boundaries depend on the competition between migration and deformation of the bed forms. Further, we show that deformation is the sole cause of curved cross-set boundaries and define a quantitative relationship between the curvature of the bounding surfaces of the preserved cross sets and the deformation rate of the bed forms. The theoretical results compare well with experimental data of subaqueous, transverse bed form evolution under equilibrium, steady state conditions with no net deposition.

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Additional Information:© 2013 American Geophysical Union. Received 7 January 2013; revised 13 June 2013; accepted 19 June 2013; published 24 July 2013. This article was published online on 24 July 2013. Some text has been changed to reflect the wording in Martin and Jerolmack [2013]. This notice is included in the online and print versions to indicate that both have been corrected on 6 September 2013. This research was supported by the National Center for Earth-surface Dynamics (NCED), a Science and Technology Center funded by NSF under agreement EAR-0120914, and also by NSF grants EAR-0824084 and EAR-0835789. E.F.G. would like to acknowledge funds from the Joseph T. and Rose S. Ling Professorship. V.G. acknowledges the support from the Hydrology Section of AGU via the Horton Research Grant. We would like to thank Andy Petter for stimulating discussions that improved the ideas presented in this manuscript and Raleigh Martin for the help in conducting the experiment. We also thank Alex Densmore, Dave Rubin, and an anonymous reviewer for constructive reviews on an earlier version of this manuscript.
Funding AgencyGrant Number
NSF National Center for Earth-surface Dynamics (NCED)EAR-0120914
Joseph T. and Rose S. Ling ProfessorshipUNSPECIFIED
AGU Hydrology Section Horton Research GrantUNSPECIFIED
Subject Keywords:bed forms; cross-stratification; bounding surfaces; set thickness
Issue or Number:3
Record Number:CaltechAUTHORS:20131203-103750902
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Official Citation:Ganti, V., C. Paola, and E. Foufoula-Georgiou (2013), Kinematic controls on the geometry of the preserved cross sets, J. Geophys. Res. Earth Surf., 118, 1296–1307, doi:10.1002/jgrf.20094
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42796
Deposited By: Tony Diaz
Deposited On:03 Dec 2013 23:53
Last Modified:03 Oct 2019 06:01

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