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Book Chapter

Accretion in Deep Shelf-Edge Reefs, St. Croix, U.S.V.I.

By
Dennis K. Hubbard
Dennis K. Hubbard
West Indies Laboratory, St. Croix, USVI 00820
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Randolph P. Burke
Randolph P. Burke
North Dakota Geological Survey, University Station, Grand Forks, ND 58202
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Ivan P. Gill
Ivan P. Gill
Applied Carbonate Research Program, Dept. of Geology, Louisiana State University, Baton Rouge, LA 70803
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Published:
January 01, 1985

Abstract

Fourteen cores from deeper, shelf-edge reefs on St. Croix, USVI, record an impressive ability to build substantial thicknesses of carbonate material, both horizontally and laterally. At Salt River submarine canyon, over 24 m of Holocene reef material has been added laterally to a reef now in 30 m of water. Most of that thickness is caused by the accumulation of displaced rubble and larger talus blocks from shallower reefs above.

At Cane Bay, the amount of in-place framework decreases with depth, while the actual rate of reef accretion increases. Like at Salt River, much of this accretion was caused by the incorporation of debris derived from shallower water.

Both of these modern reefs are substantially or wholly collections of displaced reefal material derived from somewhere upslope. With the percentage of framework down near 30%, and much of that being out of place, it would clearly be difficult to distinguish these as true reefs in the ancient based on core data alone.

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Contents

SEPM Core Workshop Notes

Deep-Water Carbonates: Buildups, Turbidites, Debris Flows and Chalks—A Core Workshop

Paul D. Crevello
Paul D. Crevello
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Paul M. Harris
Paul M. Harris
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SEPM Society for Sedimentary Geology
Volume
6
ISBN electronic:
9781565762619
Publication date:
January 01, 1985

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