Environmental influences on the formation of sedimentary fabric in a fine-grained carbonate-shelf environment: Dry Tortugas, Florida Keys |
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| Authors: | S J Bentley C A Nittrouer |
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| Institution: | (1) Marine Sciences Research Center, State University of New York, Stony Brook, New York 11794-5000, USA, US |
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| Abstract: | Sedimentological studies were undertaken in the Dry Tortugas to examine environmental influences on the formation of sedimentary
fabric. 234Th, 210Pb, grain size, porosity, and fabric analyses reveal the presence of a soft, fine-grained, well mixed surface layer underlain
by compact, shelly, intensely bioturbated carbonate muds. Vertical zonation of biogenic structures indicates that deep bioturbation
is advective and results in transport of fine material to the seabed surface. The impact of physical oceanographic processes
appears to be restricted to the surface layer; however, potential for preservation of this layer in the sediment record is
low due to intense mixing in deeper sediments. Thus, preserved sediments retain an incomplete record of the dominant benthic
processes at the study area. |
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