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Storvola, Type I Shelf Margin, Norway

By
Ron Steel
Ron Steel
Jackson School of Geosciences, University of Texas at Austin
,
Austin, Texas, USA
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Piret Plink-Björklund
Piret Plink-Björklund
Geology, University of Gothenburg
,
Gothenburg, Sweden
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Donatella Mellere
Donatella Mellere
Norske Shell
,
Stavanger, Norway
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Published:
January 01, 2008

Abstract

Storvola is a Spitsbergen mountainside outcrop (1 km x 10 km [0.6 mi x 6 mi]) that exposes the coastal plain, shelf, slope, and basin-floor reaches of a series of lower Eocene clinoforms (Figure 2B, C). The clinoforms have decompacted amplitudes of some 300–350 m (984–1148 ft) reflecting basin water depths of this magnitude at times of relative sea level lowstand (from shelf edge to basin floor). Type 1 shelf margins typically have relatively deep incision of river distributary channels on their shelf-edge reaches, turbidite channels, and large-scale disruption (growth faults, rotated blocks, and large slump complexes) on their mud-prone slopes, and sand-rich fans on their proximal basin-floor reaches. In contrast, Type 11 shelf margins (see Plink-Bjorklund and Steel, chapter 70, this volume) have their sediment budget partitioned differently in the clinoform. They have limited incision at the shelf edge, and strike-extensive, sand-rich upper and middle slopes, but have no basin-floor fans. The contrasts between Type I and Type II margins are summarized in Figure 2A. Clinoform 14 on Storvola, illustrated here as our Type 1 shelf-margin example (Figure 2B), consists of a regressive delta phase on the shelf platform, a falling-stage and lowstand phase of sandy sediment gravity flows in deep-water channels of the shelf margin (below the shelf edge) and deep-water basin floor, and a transgressive estuarine phase back on the shelf platform. These three phases can be further subdivided into seven segments:

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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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