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Abstract
Journal of Sedimentary Research, Section
A: Sedimentary Petrology and Processes
Vol. 66 (1996)No.
3. (May), Pages 625-631
Silt Aggregates in Laminated Marine Sediment Produced by Agglutinated Foraminifera
Jennifer Pike, Alan E.S. Kemp
ABSTRACT
Fabric studies of Miocene to Holocene hemipelagic and pelagic marine sediments
by means of backscattered electron imagery reveal the common presence of
exotic aggregates of well to poorly sorted silt-size particles. New observations
of silt aggregates associated with readily identifiable multi-chambered
agglutinated foraminifera, when combined with recent experimental insights
into the chamber-building activities of these organisms, provide a new
model for the formation of these aggregates. Some silt aggregates of well-sorted
grains appear to represent the collapsed or compacted tests of agglutinated
foraminifera. Aggregates of poorly sorted, silt-size material probably
represent the discarded "detritic covers" that agglutinated foraminifera
erect around themselves while constructing new chamber. These remnant tests
and detritic covers are likely to be preserved in settings of low bottom-water
oxygenation where bioturbation is limited or absent. The long stratigraphic
range (Cambrian to Recent) and diverse habitats (hyposaline lagoons to
abyssal environments) occupied by agglutinated foraminifera suggest that
they may be an important, but hitherto unrecognized, contributor to the
production of early fabrics in fine-grained marine sediments. Their presence
may provide unique evidence on the concentration of dissolved oxygen in
the bottom waters.
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