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Architecture of Proximal Midfan Levee Deposits, Punta Farallónes La Flor, Nicaragua

By
C. Brandes
C. Brandes
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I. Struss
I. Struss
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C. Vandré
C. Vandré
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J. Winsemann
J. Winsemann
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Published:
January 01, 2008

Abstract

Excellent exposures along the coast of southwestern Nicaragua allow description and interpretation of middle to upper Eocene, coarse-grained channel-levee complexes of the Brito Formation, which form part of a 10–13-km (6.2–8-mi)-thick fill of the Sandino forearc basin. The up to 2500-m (8200-ft)-thick deep-water rocks consist of seven, vertically stacked, channel-levee complexes. Coastal exposures perpendicular and parallel to the depositional trend allow an analysis of variations in architecture and lithofacies of the channel-levee complexes. Each complex consists of several (one to seven) laterally stacked, probably shingled, channel-levee systems with a feeder or distributary channel near the center. Associated sheetlike deposits are interpreted as levees, based on bed thickness, grain size, occurrence of climbing ripples, convolute laminations, and rip-up clasts (CCC elements; Walker, 1984), lateral facies evolutions, variations in the local paleoslope, and intercalated crevasse deposits. The channel-levee complexes are 80–120 m (262–393 ft) thick and can be laterally traced for about 5–11 km (3–7 mi). The following pages show a longitudinal section through a channel-levee system, which outcrops in the area of Punta Farallónes La Flor. The channel fill has a lens-shaped geometry in cross section and is filled with thick- to very thick-bedded, amalgamated sandstones and thick- to very thick-bedded pebbly sandstones. Deposits formed from cohesive debris flows, sandy debris flows, and high-density turbidity currents (HDTs). The beds are massive or planar-parallel stratified. The channel axis trends north-northwest to south-southeast. Paleoflow direction was towards the north-northwest. A few beds of the channel fill are rich in large (up to 32 cm [12.6 in.]) siltstone rip-up clasts.

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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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