Rapid gravity flow transformation revealed in a single climbing ripple

Author:

Baas Jaco H.1,Best Jim2,Peakall Jeff3

Affiliation:

1. School of Ocean Sciences, Bangor University, Menai Bridge LL59 5AB, UK

2. Departments of Geology, Geography and Geographic Information Science, and Mechanical Science and Engineering, and Ven Te Chow Hydrosystems Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA

3. School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK

Abstract

Abstract Sediment gravity flows demonstrate a wide range of rheological behaviors, and past work has shown how transformations between flow types generate spatiotemporal changes in the resultant sedimentary successions. We used the geometrical characteristics of a single climbing ripple to demonstrate how such flows can transform from a turbulent to a quasi-laminar plug flow, with the transitional clay flow sequence being manifested by abnormally large heterolithic sand-clay current ripples with small backflow ripples, and then abundant clay deposition associated with smaller ripples. Analysis of ripple size, angle of climb, grain size, internal erosional surfaces, and soft-sediment deformation suggests that transformation in the rheological character of the sediment gravity flow was rapid, occurring over a period of tens of minutes, and thus probably over a spatial scale of hundreds of meters to several kilometers. Our study indicates how the character of flow transformation can be elucidated from the details of a small-scale sedimentary structure.

Publisher

Geological Society of America

Subject

Geology

Reference30 articles.

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3. Deposition of climbing-ripple beds: A flume simulation;Ashley;Sedimentology,1982

4. Newly recognized turbidity current structure can explain prolonged flushing of submarine canyons;Azpiroz-Zabala;Science Advances,2017

5. Dimensional analysis of current ripples in recent and ancient depositional environments [Ph.D. thesis];Baas;Geologica Ultraiectina,1993

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