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Abstract
Journal of Sedimentary Research, Section
A: Sedimentary Petrology and Processes
Vol. 67 (1997)No.
1. (January), Pages 17-25
Lagoon-Shelf Sediment Exchange by Storms--Evidence from Foraminiferal Assemblages,
East Coast of Grand Cayman, British West Indies
Chun Li, Brian Jones, Paul Blanchon (*)
ABSTRACT
The abundance and size distribution of ecologically diagnostic foraminiferal
species are ideal tracers of sediment transportation and storm processes
on the windward shelf of Grand Cayman. During storm peak, sediment in the
lagoon and fore-reef is suspended by large storm waves. Sediments of sand
size and finer, including forereef foraminifera species, are moved shoreward
by wind-driven currents and deposited in a blanket behind the reef. The
fore-reef foraminiferal assemblage is winnowed and the mean and median
sizes of Amphistegina gibbosa progressively decrease from the shelf
edge into the inner lagoon. As the storm wanes, water piled in the lagoon
drains via channels and sediment is transported offshore. Consequently,
lagoonal sediment that includes lagoonal foraminiferal t sts is carried
out of the lagoon and deposited on the fore-reef terrace and down the shelf
escarpment. This process produces winnowed lagoonal sediments because suspended
fine sediments are preferentially transported. During the long inter-storm
periods, tranquil conditions are once again established and sediment exchange
between the lagoon and on the fore-reef terrace ceases. During this time,
lagoonal organisms once again colonize the lagoon and bioturbation causes
mixing of surface and subsurface sediments.
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