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Channel Geometries and Internal Deformation Patterns of the Playe Las Tablas channel-levee System, Nicaragua

By
I. Struss
I. Struss
Institute of Geology, University of Hannover
,
Hannover, Germany
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P. Blisniuk
P. Blisniuk
Institute for Geoscience, University of Potsdam
,
Potsdam, Germany
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C. Brandes
C. Brandes
Institute of Geology, University of Hannover
,
Hannover, Germany
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M. Kischkies
M. Kischkies
Institute of Geology, University of Hannover
,
Hannover, Germany
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J. Winsemann
J. Winsemann
Institute of Geology, University of Hannover
,
Hannover, Germany
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Published:
January 01, 2008

Abstract

Deep-water channel-levee complexes of the middle to upper Eocene Brito Formation are extensively exposed along the Pacific coast of southwestern Nicaragua across a distance of more than 70 km (43 mi) and a total thickness of approximately 2500 m (8200 ft). The Brito Formation forms part of an up-to-13-km (≤8-mi)-thick sedimentary infill of the Sandino forearc basin consisting of Late Cretaceous to Holocene deep- to shallow-marine and continental pyroclastic deposits. Coastal outcrops parallel and perpendicular to bed trends allow the reconstruction of laterally and vertically stacked channel-levee complexes. Each channel-levee complex consists of several (one to seven) probably shingled, channel-levee systems with a feeder or distributary channel near the center. Individual channel-levee complexes are 80–120 m (262–393 ft) thick and 5–11 km (3–7 mi) wide. Levee deposits are mainly sheetlike and have been interpreted on the basis of bed thickness, grain size, occurrence of CCC elements (climbing ripples, convolute lamination, and rip-up clasts, Walker, 1984), lateral facies changes, variations in the local paleoslope, and locally intercalated crevasse deposits. The Playa Las Tablas section documents a coarse-grained channel-levee system with synsedimentary faulting along the channel margins. The system consists of three offset-stacked channel fills with relatively low aspect ratios that are flanked by finer grained, sandy, levee deposits. The channels are mainly filled with pebble- to boulder-sized pebbly sandstones (diameter of the ten largest clasts, D10 = 32 cm [12.6 in.]) deposited from high-density turbidity flows. The levee deposits consist of sheetlike, thin- to thick-bedded sandstones with interbedded siltstones.

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Contents

AAPG Studies in Geology

Atlas of Deep-Water Outcrops

Tor H. Nilsen
Tor H. Nilsen
Desceased
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Roger D. Shew
Roger D. Shew
University of North Carolina
Wilmington, North Carolina
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Gary S. Steffens
Gary S. Steffens
Shell International E&P
Houston, Texas
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Joseph R. J. Studlick
Joseph R. J. Studlick
Maersk Oil America Inc.
Houston, Texas
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American Association of Petroleum Geologists
Volume
56
ISBN electronic:
9781629810331
Publication date:
January 01, 2008

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