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

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 aim of this box day trip 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 simply distinction how physiographic environment and weather strongly impact shallow-marine carbonate sedimentation yet, while, current new substitute versions 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 wonderful outcropping Pleistocene marine and non-marine sequences, supplying an extraordinary chance to work out how glossy facies are preserved in 3 dimensions.

To let comparability of significant controls on shallow-marine carbonate sedimentation, this box day trip will start by means of in brief interpreting 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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Additional info for Carbonate Environments and Sequences of Caicos Platform: Caicos, British West Indies to Miami, Florida, July 20-26, 1989

Example text

3) At 22 degrees north, Caicos is tropical. 4) Although 20-30 cold fronts do intrude this area, northerly winds are not cold enough to limit tropical organisms, and winds are less intense than farther north. 5) The climate is subarid with all but the larger islands receiving less than 70 cm of rainfall per year (Milliman, 1966). Most rainfall is associated with convection processes over the larger islands. Smaller islands, such as West Caicos, receive much less rainfall. 6) Evaporation far exceeds rainfall, and brines and evaporites form in coastal salinas and tidal flats.

25). These islands form a nearly continuous barrier to tidal flow, wave energy and circulation along the northern margin and effectively isolate the northern skeletal sand rim from the non-skeletal sands of the platform interior. On the northeastern and northwestern margins, emergent islands form a discontinuous barrier and focus sites of onbank and offbank circulation and sediment transport through breaks in the island chain. An emergent Pleistocene reefal rim occurs along portions of the western margins of Providenciales and West Caicos (Figs.

Schizothrix appears to be effective in trapping sediment to about 1 mm in thickness (Wanless, 1969; Hardie, 1977). When covered by a new millimeter-thick layer of sediment, the filaments move up to the new surface and stabilize it. Stabilization commonly occurs within a week, before the new sediment laminae have dried out. This rapid restabilization is important in inhibiting desiccation cracks. The Schizothrix mat is generally associated with a flat, featureless surface and is producing planar algal stromatolites (Wanless, 1969).

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