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Book Chapter

Submarine Fans and Associated Sediments of the Tertiary Coastal Range of Guipúzcoa, Spain

By
Arthur van Vliet
Arthur van Vliet
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Published:
January 01, 2008

Abstract

The lower Tertiary outcrops along the coast of Guipúzcoa, northern Spain, consist exclusively of deep-marine sediments, deposited in a narrow, elongated (east-southeast to west-northwest) basin. The early Tertiary sedimentary history of this basin can be described in terms of three phases: 1) predominantly (hemi)pelagic deposition (almost the entire Paleocene), 2) deposition from axially flowing, carbonate-rich turbidity currents (latest Paleocene to earliest Eocene), and 3) lateral input of predominantly terrigenous clastics via submarine fans (most of the early Eocene). During the latter two phases, the contribution of (hemi)pelagic sedimentation became progressively less important due to increasing rates of turbidite sedimentation. Various facies associations can be distinguished in the lower Eocene turbidite successions. In the middle-fan association, thick-bedded, proximal turbidites are concentrated in overall nonchannelized packages, tens of meters (>50 ft) thick, which internally show channeling. In the outer-fan association, thick-bedded, proximal turbidites have planar-bedding geometries but are still concentrated in packages. A vertical section through these packages commonly displays a crude coarsening- and thickening-upward trend of beds. In the fan-fringe association, thick-bedded, proximal turbidites no longer occur concentrated in packages but are dispersed in a matrix of thin-bedded, distal turbidites. The basin-plain association, is characterized by monotonous successions of thin-bedded turbidites. (Hemi) Pelagic interbeds may be present in all of these facies associations and reflect primarily temporal spacing of depositional events from episodic sediment-gravity flows. Vertical and lateral arrangements of different facies associations can be interpreted in terms of episodes of progradation and abandonment of submarine-fan systems. In additon, late Maastrichtian to early Paleocene diapirism of Upper Triassic evaporites created swells and depressions on the basin floor and controlled the deposition

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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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