By Harold R. Wanless, Jeffrey J. Dravis, Lenore P. Tedesco, Victor Rossinsky(auth.)
About The Product
Published by way of the yank Geophysical Union as a part of the Field journey Guidebooks Series.
The objective 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 in basic terms distinction how physiographic atmosphere and weather strongly impression shallow-marine carbonate sedimentation yet, whilst, current new substitute types of Bahamian sedimentation with direct program to the translation and prediction of similar historical carbonate facies and sequences.
In addition to containing a customary suite of Holocene sedimentary facies, Caicos Platform additionally indicates marvelous outcropping Pleistocene marine and non-marine sequences, offering an extraordinary chance to work out how smooth facies are preserved in 3 dimensions.
To permit comparability of significant controls on shallow-marine carbonate sedimentation, this box day trip will commence by way of in short studying Holocene sedimentary environments and facies forming in south Florida less than the impression of a non-oceanic, low-relief, shelf environment and a wet weather.
Read or Download Carbonate Environments and Sequences of Caicos Platform: Caicos, British West Indies to Miami, Florida, July 20-26, 1989 PDF
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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
Lloyd et ale (1987) radiocarbon dated the beach ooids and found them to date 620 YBP, younger than those in the adjacent offshore. They concluded these ooids formed in the wave swash zone. Indeed, the beach zone is well agitated during much of the year. Lloyd et ale (1987) argue that the sands could not have come from further out on the platform because the adjacent The extensive offshore is stabilized by seagrass beds. Holocene beach ridge complex on eastern West Caicos attests to the large volume of Holocene oolitic sand that has been provided to and presumably also formed along the beach.
Repetitive deep burrow excavations by the burrowing mud shrimp, Callianassa, and subsequent storm infilling of burrow networks is (a) obliterating the transgressed tidal flat sequence and (b) re-defining the preserved texture, composition and faunal assemblage of the accumulating marine sedimentary sequence (Fig. 31). Callianassa is excavating open networks of thumbsized burrow chambers to a sediment depth of 1-2 m, resulting in (a) excavation and expulsion of muds and medium- to fine-grained particles to the surface and (b) concentration of grains too coarse ( > 1-2 mm) to be excavated in deeper subsurface side chambers.
Porites porites is the dominant coral. Sediment is a mixture of peloids, superficial ooids, irregular ooids, grapestone and minor skeletal grains. Coated grains are as common in the deeper zones as they are in the shallower areas. Some of the grapestones are clearly formed by agglutinating benthic foraminifera, but many are aggregated by cementation. Coated aggregate grains (botryoidal lumps) are present in a few of the areas with larger bedforms (especially just west of the Mid-Platform Shoal), indicating better agitation.