Effect of biogeochemical diagenesis on sediment fabric in shallow marine carbonate sediments near the Dry Tortugas, Florida |
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Authors: | Yoko Furukawa Dawn Lavoie Kevin Stephens |
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Institution: | (1) Institute of Marine Sciences, University of Southern Mississippi, Stennis Space Center, MS 39529, USA, US;(2) Seafloor Sciences Branch, Naval Research Laboratory, Stennis Space Center, MS 39529, USA, US |
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Abstract: | Shallow marine carbonate sediments near the Dry Tortugas undergo extensive biogeochemical diagenesis upon deposition, resulting
in postdepositional fabric comprised of micritic aggregates of clay-sized particles, a matrix of peloidal mud, and intraparticular
cementation. Freshly deposited primary skeletons, mostly Halimeda fragments, yield micritic aggregates of clay-sized particles, which then form peloidal mud fabric upon compaction. The cryptocrystalline
particles produced by micritization are later replaced by high magnesian calcite. Cementation is observed in the intra-particular
microenvironment. However, no inter-particular, grain-binding cement was detected throughout the gravity core samples investigated. |
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