Carbonate Environments and Sequences of Caicos Platform: by Harold R. Wanless, Jeffrey J. Dravis, Lenore P. Tedesco,

By Harold R. Wanless, Jeffrey J. Dravis, Lenore P. Tedesco, Victor Rossinsky(auth.)

About The Product

Published via the yankee Geophysical Union as a part of the Field journey Guidebooks Series.

The aim of this box expedition is to distinction the depositional environments and sedimentary facies of 2 carbonate platform settings: the south Florida carbonate peninsula and Caicos Platform. In doing this, we can't purely distinction how physiographic surroundings and weather strongly impression shallow-marine carbonate sedimentation yet, even as, current new substitute types of Bahamian sedimentation with direct software to the translation and prediction of similar historic carbonate facies and sequences.

In addition to containing a regular suite of Holocene sedimentary facies, Caicos Platform additionally shows fantastic outcropping Pleistocene marine and non-marine sequences, offering an extraordinary chance to determine how smooth facies are preserved in 3 dimensions.

To enable comparability of significant controls on shallow-marine carbonate sedimentation, this box expedition will start through in short analyzing Holocene sedimentary environments and facies forming in south Florida lower than the effect of a non-oceanic, low-relief, shelf environment and a wet weather.

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Extra resources for Carbonate Environments and Sequences of Caicos Platform: Caicos, British West Indies to Miami, Florida, July 20-26, 1989

Example text

The levee backslope gradually slopes into the intertidal marsh or pond over a distance of 10-1,000 m. The levees are built of alternations of em-thick fine peloidal grainstone layers and organic layers which represent decomposed S cytonema algal mats. Millimeter laminae and Schizothrix mats occur only in a narrow zone along some shores and as a broader zone on east-facing shores where occasional strong easterlies cause more frequent sedimentation events. Polycheate worms, rootlets and other bioturbating grazers and infauna are partially to completely obliterating stratification, except in areas of more rapid sedimentation where Schizothrix predominates.

35b and 61). This shoal, not visited on this trip, is an excellent example of a platform-margin oolitic shoal and an important example of the close spatial association of oolitic and reefal environments. Ambergris Shoal. The most striking oolitic sand body on Caicos platform is Ambergris Shoal. This is an elongate shoal extending westward from Ambergris Cay across the platform (Fig. 25). Irregular and micritized ooids on the more stabilized flank of the shoal (Figs. 34 g and i) grade to well-laminated ooids with little micritization near and on the active shoal crest (Fig.

This peaty character is also present in sediment from beneath the pond zone away from present mangroves, indicating that the extent of marsh and mangrove environments may fluctuate through time. A first time visitor to the flats will be struck by the abundance of scrub red mangrove in the channeled outer algal marsh environment and the scrub black mangrove on the shore and channel margin levees. Indeed, the mangroves could define both an ecological zone of the tidal flats and be more of a focus of the sediment facies characterizations.

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