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Anatomy of a mixed-influence shelf edge delta, Karoo Basin, South Africa

By
Luz E. Gomis-Cartesio
Luz E. Gomis-Cartesio
Stratigraphy Group, School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Manchester M13 9PL, UK
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Miquel Poyatos-Moré
Miquel Poyatos-Moré
Stratigraphy Group, School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Manchester M13 9PL, UK
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Stephen S. Flint
Stephen S. Flint
Stratigraphy Group, School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Manchester M13 9PL, UK
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David M. Hodgson
David M. Hodgson
Stratigraphy Group, School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK
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Rufus L. Brunt
Rufus L. Brunt
Stratigraphy Group, School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Manchester M13 9PL, UK
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Henry Dev. Wickens
Henry Dev. Wickens
Geo-Routes Petroleum, 37 Zevendal Road, Kuils River 7580, South Africa
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Published:
January 01, 2017

Abstract:

The position and process regime of paralic systems relative to the shelf edge rollover is a major control on sediment transfer into deep water. The depositional strike and dip variability of an exhumed Permian shelf edge succession has been studied in the Paardeberg Ridge, Karoo Basin. Siltstone-rich slope turbidites are overlain by 25–75 m-thick prodelta parasequences. These are truncated by a 30 m-thick sandstone-prone unit of tabular or convex-topped sandstones, interpreted as wave-modified mouth bars, cut by multiple irregular concave-upwards erosive surfaces overlain by sandstones, interpreted as distributary channels. The stratigraphic context, lithofacies and architecture are consistent with a mixed-influence shelf edge delta; the erosional base to the unit marks a basinwards shift in facies, consistent with a sequence boundary. Channels become thicker, wider, more erosive and incise into deeper-water facies downdip and correlate with sandstone-rich upper slope turbidites, all of which support the bypass of sand across the rollover. The overall progradational stacking pattern results in a stratigraphic decrease in channel dimensions. The results of this study suggest a predictable relationship between channel geometry, facies and position on the shelf-to-slope profile under a mixed wave and fluvial process regime.

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Contents

Geological Society, London, Special Publications

Sedimentology of Paralic Reservoirs: Recent Advances

G. J. Hampson
G. J. Hampson
Imperial College London, UK
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A. D. Reynolds
A. D. Reynolds
BP Exploration Operating Co. Ltd, UK
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B. Kostic
B. Kostic
Badley Ashton & Associates, UK
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M. R. Wells
M. R. Wells
BP Exploration Operating Co. Ltd, UK
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Geological Society of London
Volume
444
ISBN electronic:
9781786203748
Publication date:
January 01, 2017

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