Geology and sediment accumulation rates at Carrie Bow Cay, Belize

Smithsonian Contributions to the Marine Sciences 12
By: , and 
Edited by: Klaus Ruetzler and Ian G. Macintyre

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Abstract

A 24 km long transect of cores consisting of four rotary drill cores and seven vibrocores was drilled in a line extending from the seaward side of the reef crest at Carrie Bow Cay to the mainland at a point between Sittee Point and the town of Stann Creek. Two of the four rotary cores were drilled seaward of the reef crest, one through a spur to a depth of 7.6 m and the other into the adjacent groove to a depth of 18.3 m. The two cores show no evidence that the spur and groove system was erosional in origin; rather they demonstrate that it was constructional. Submarine cementation, chiefly in the form of fine-grained high-magnesium calcite, was found mainly in cemented internal sediment in both cores drilled seaward of the reef crest.

Two other rotary cores were drilled landward of the reef crest. One was drilled on the reef flat to a depth of 8.8 m, and the other was drilled on the southwest tip of Carrie Bow Cay to a depth of 17.7 m. Both cores encountered essentially uncemented carbonate reef sands with some coral rubble. Of the four rotary cores, only the Carrie Bow Cay core encountered Pleistocene bedrock. Radiocarbon dating of a large head of Siderastrea siderea, growing on bedrock from the Carrie Bow Cay core at a depth of 15.04 m below sea level, gave an age of 6960±110 years. The leached calcitic coralline bedrock, at a depth of 15.7 m below sea level in the Carrie Bow Cay core, contained root marks, and iron staining indicative of subaerial exposure.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Geology and sediment accumulation rates at Carrie Bow Cay, Belize
Series title Smithsonian Contributions to the Marine Sciences
Series number 12
Year Published 1982
Language English
Publisher Smithsonian Institution Press
Publisher location Washington, D.C.
Description 13 p.
Larger Work Type Book
Larger Work Title The Atlantic Barrier Reef ecosystem at Carrie Bow Cay, Belize, I: structure and communities
First page 63
Last page 75
Country Belize
Other Geospatial Carrie Bow Cay
Online Only (Y/N) N
Additional Online Files (Y/N) N