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Outcrop Examples of Amalgamated Channel Complexes, Tabernas Basin, Spain

By
Stephen P. J. Cossey
Stephen P. J. Cossey
Cossey and Associates Inc., Durango, Colorado, USA
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Kick Kleverlaan
Kick Kleverlaan
Consultant, Amsterdam, The Netherlands
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Published:
January 01, 2008

Abstract

The informally named Cigar and Dog outcrops are amalgamated channels and minor mass-transport complexes within a Tortonian-age submarine-fan complex in the Tabernas basin of southeast Spain. The submarine-fan complex within the chozas Formation has been mapped in detail by Kleverlaan (1989). Fie named the lowermost, sand-rich fan complex “System 1” in a time-slice reconstruction of the basin. The entire System 1 fan complex measures about 6 km (3.7 mi) in an east-west direction and 3 km (1.9 mi) in a north—south direction. The fan consists of a series of linear, coalesced, gravel-filled channels that feed into a sandy lobe consisting of stacked, gravel- to sand-filled scours. The Dog and Cigar outcrops are located within this sandy lobe (Figures 1,2). This sand-rich lobe is encased in mudstones and has a maximum thickness of 180 m (591 ft). The sediments are composed of lithic fragments of schists, gneisses, and a minor amount of marble, indicating provenance from the north from a paleovalley incised into the metamorphic rocks of the northern basin margin (Figure 2). The typical internal architecture of System 1 is that of a stack of deep, relatively narrow scours filled with sandstone and pebbly sandstone with some laterally extensive, well-stratified beds. Mud drapes and heterolithics occur with a wide range of lateral extents, but there are no basinwide mud blankets. There is no apparent vertical trend within the overall system, such as thinning- and fining- or thickening- and coarsening-upward, and only a slight average decrease in grain size and increase in mud toward the distal margins of the system.

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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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