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Facies and Architecture of the Lezonabar Member, Higuer-Getaria Formation, Errentzun Zabal, Spain

By
D. M. Hodgson
D. M. Hodgson
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R. Wild
R. Wild
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Published:
January 01, 2008

Abstract

Late Cretaceous-Eocene deep-water deposits of the Guipúzcoa basin are well exposed along the Basque coastline. Early Eocene deposits provide an opportunity to analyze the facies distribution and architecture of a thick-bedded, sand-rich, turbidite system, a commonly identified seismic facies. The Guipúzcoa basin is a narrow east-southeast-to-west-northwest-trending foreland basin that formed during the Cretaceous and Eocene. Sediment was supplied to deep-water settings via the Aquitanian basin in the northeast and the South Pyrenean foreland basin in the southeast. In the late Cretaceous and Paleocene, the shelf area was largely covered with carbonate platforms, and turbidity currents transported carbonate-rich sediment into the deeper parts of the basin. The deep-water sediment supply changed through early Eocene times to a siliciclastic-rich system, and the stratigraphy comprises a series of prograding submarine-fan systems. The deposits change upward from thin beds to sheets to channels. Three sedimentary cycles have been identified that successively increase in their proportion of siliciclastic material, average grain size, and bed thickness. The uppermost cycle, the only cycle dealt with in this paper, is the Higuer-Getaria Formation, which is exposed between Hondarribia and San Sebastian (Figure 1). Seven higher order cycles have been identified and correlated more than 15 km (9 mi) downdip (Figure 5). In the Higuer-Getaria Formation, 20–80-m (66–262-ft)-thick intervals of thick-bedded, immature, coarse-grained sandstones with widespread amalgamated and dewatered contacts, are separated by 15–40-m (49–131-ft) - thick intervals of thin-bedded turbidites that preserve a wide diversity of ichnofauna. Updip, bottom currents are interpreted to have reworked the thin-bedded turbidite bed-tops

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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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