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Book Chapter

Architecture of the Ainsa-1-Quarry Channel Complex, Spain

By
Pau Arbués
Pau Arbués
1
Grup de Geodinàmica í Anàlisi de Conques, Universitat de Barcelona, Barcelona, Spain
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Donatella Mellere
Donatella Mellere
2
A/S Norske Shell, 4098 Tananger, Norway
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Oriol Falivene
Oriol Falivene
1
Grup de Geodinàmica í Anàlisi de Conques, Universitat de Barcelona, Barcelona, Spain
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Oscar Fernández
Oscar Fernández
3
Midland Valley Exploration Ltd., Glasgow, United Kingdom
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Josep Anton Muñoz
Josep Anton Muñoz
1
Grup de Geodinàmica í Anàlisi de Conques, Universitat de Barcelona, Barcelona, Spain
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Mariano Marzo
Mariano Marzo
1
Grup de Geodinàmica í Anàlisi de Conques, Universitat de Barcelona, Barcelona, Spain
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Jordi M. de Gibert
Jordi M. de Gibert
4
Departament d’Estratigrafia, Paleontologia i Geociencies Marines, Universitat de Barcelona, Barcelona, Spain
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Published:
January 01, 2008

Abstract

The Ainsa turbidite system is part of the slope fill of the Ainsa basin. It was deposited in foredeep and wedge-top depozones. The base of the system is an angular unconformity; the top is a gradual facies change to a mudstone-dominated unit. Maximum thickness is 305 m (1000 ft) and preserved width and length are 8 km (4.9 mi) and 9 km (5.6 mi), respectively. Mean paleoflow is to the northwest, parallel to the main axis of the basin. The system consists of three cycles of channel complex development and abandonment. In the basal part of these cycles, there are one or two channel complexes that are nearly straight. The dimensions are greater than 1.5 km (0.9 mi wide), greater than 9 km (5.6 mi long), and up to 100 m (328 ft) thick. channel complexes are bounded laterally and above by thin beds that represent overbank and frontal-splay deposits, or by slump deposits with a dominant mudstone composition. Synchronous thrusting and folding caused the angular character of the basal unconformity, the marked thinning of the system towards the basin margins, the progressively rotated cycle boundaries, the frequent multilateral architecture of channel-complexes, and in some cases, channel-complex divergences around growing anticlines. The outcrop corresponds to a partial section of one of the two channel complexes in the lowermost cycle. Mean paleoflow is to the west-northwest (290°) and the outcrop trends 160°–340°. The base of the channel complex is not exposed. It is interpreted to be a few meters (>10 ft) below the stratigraphically lowest beds in the outcrop.

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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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