Role of karst denudation on the accurate assessment of glacio-eustasy and tectonic uplift on carbonate coasts
- Permanent Link:
- Role of karst denudation on the accurate assessment of glacio-eustasy and tectonic uplift on carbonate coasts
- Series Title:
- Geological Society, London, Special Publications
- Mylroie, John E.
Mylroie, Joan R.
- Publication Date:
- Subjects / Keywords:
- Karst Denudation ( local )
Glacio-Eustasy ( local )
Tectonic Uplift ( local )
Carbonate Coasts ( local )
Flank Margin Cave ( local )
- serial ( sobekcm )
- Quaternary glacio-eustasy has traditionally been determined in part by the examination of fossil coral reefs on carbonate islands and coasts uplifted by tectonics. These studies do not properly account for dissolutional denudation, which is cumulative, making higher and therefore older terraces exist at elevations far below their assumed depositional elevation. Karst pedestals (karrentische) on Guam reveal the extent of the denudation (c. 50 mm kaâˆ’1) and demonstrate that theoretical denudation models can be accurately applied to eogenetic carbonates in tropical settings. Aeolian calcarenite islands such as the Bahamas have been used as tectonically stable sea-level calibrations for other islands, which may not be correct. Flank margin caves, forming in the distal margin of the freshwater lens within a carbonate island, are excellent sea-level indicators. Analysis of flank margin cave elevations indicates that the Bahamas have had past sea-level highstands >6 m, perhaps up to 15 m or more, for which no fossil coral data exist. Denudational removal of these older corals has biased the record to younger events and only flank margin caves remain as viable terrestrial signatures of these older sea-level highstands.
- Original Version:
- Geological Society, London, Special Publications, Vol. 466 (2017-11-06).
- Source Institution:
- University of South Florida Library
- Holding Location:
- University of South Florida
- Rights Management:
- This object is protected by copyright, and is made available here for research and educational purposes. Permission to reuse, publish, or reproduce the object beyond the bounds of Fair Use or other exemptions to copyright law must be obtained from the copyright holder.
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