A QUANTITATIVE MODEL OF CLIMBING RIPPLES AND THEIR CROSS‐LAMINATED DEPOSITS
作者:
J. R. L. ALLEN,
期刊:
Sedimentology
(WILEY Available online 1970)
卷期:
Volume 14,
issue 1‐2
页码: 5-26
ISSN:0037-0746
年代: 1970
DOI:10.1111/j.1365-3091.1970.tb00179.x
出版商: Blackwell Publishing Ltd
数据来源: WILEY
摘要:
SUMMARYThe angle of climb of ripples in cross‐laminated deposits is governed by the simple relation:in which ζ is the angle of climb,Mis the rate of sediment deposition normal to the rippled bed,His the ripple height, andjbis the bedload sediment transport rate. After introducing sediment transport functions, this relation is developed using the assumptions of gradually varied flow to predict the spatial patterns of cross‐lamination types in deposits due to pure non‐uniform flow, pure unsteady flow, and simultaneous non‐uniform and unsteady flow. Most of the predicted patterns can be matched from the geological record, and the analysis affords a hitherto missing insight into the environmental significance of climbing‐ripple cross‐lamination. The analysis also results in a rigorous definition of the kinds of environmental interpretation that may legitimately be made from examples of th
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