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Contrasting Styles of Slope Deposition in the Gull Island Formation, Ireland

By
Ole J. Martinsen
Ole J. Martinsen
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Trond Lien
Trond Lien
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Published:
January 01, 2008

Abstract

The lower part of the Carboniferous Shannon Basin of western Ireland contains a deep-water succession (>1200 m [>3937 ft]) that was deposited in a confined basin. Five lithologically distinct units, from base to top, are recognized: (i) a calciclastic debris- flow and turbidite unit formed by resedimentation from nearby carbonate platforms, (ii) a siliciclastic, black shale succession, which would have source potential at depth, that onlaps basin margins (Clare Shales), (iii) a sandstone-dominated turbidite formation, controlled by ponded accommodation and deposited axially in the basin (Ross Formation), (iv) a mudstone-rich turbidite-bearing succession, which onlaps basin margins (lower Gull Island Formation), and (v) a mudstone-dominated, prograding slope succession (upper Gull Island Formation and lower Tullig Cyclothem), which grades transitionally upwards into deltaic deposits. The two parts of the Gull Island Formation, the subject of this paper, are different in terms of sandstone content, architectural elements, and genetic significance.

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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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