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Lithofacies and Depositional Architecture of an Upper Fan Channel Complex, Punta Naranjo, Nicaragua

By
I. Struss
I. Struss
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C. Brandes
C. Brandes
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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

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 have 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 to 120 m (262 to 393 ft) thick and 5 to 11 km (3 to 7 mi) wide. Levee deposits are mainly tabular and have been interpreted on the basis of bed thickness, grain size, occurrence of climbing ripples, convolute lamination, and rip up clasts (CCC elements; Walker, 1984), lateral facies changes, variations in the local paleoslope, and locally intercalated crevasse deposits. A channel complex and its associated levees at Punta Naranjo are described and analyzed in detail. This complex consists of two offset-stacked channel fills with low aspect ratios. The u-shaped channels are filled with high net-to-gross, matrix-supported conglomerates and pebbly sandstones. The most complete channel fill of this section is characterized by a coarse-grained axial fill above a lower erosive surface and finer grained, thinner bedded, channel-margin deposits within its lower part.

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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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