Effect of Biogeochemical Diagenesis on Sediment Fabric in Shallow Marine Carbonate Sediments Near the Dry Tortugas, Florida

Document Type

Article

Publication Date

12-1-1997

Department

Marine Science

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.

Publication Title

Geo-Marine Letters

Volume

17

Issue

4

First Page

283

Last Page

290

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