Holocene sedimentation in a blue hole surrounded by carbonate tidal flats in The Bahamas: Autogenic versus allogenic processes
| Autor: | Nancy A. Albury, Dana MacDonald, Peter J. van Hengstum, T. S. Winkler, Jeffrey P. Donnelly, Shawna N. Little, Richard Sullivan, A. Tamalavage |
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| Rok vydání: | 2020 |
| Předmět: |
geography
geography.geographical_feature_category 010504 meteorology & atmospheric sciences Bedrock Geochemistry Sediment Geology Sapropel 010502 geochemistry & geophysics Oceanography 01 natural sciences Sedimentary depositional environment chemistry.chemical_compound chemistry Geochemistry and Petrology Marl Facies Carbonate Holocene 0105 earth and related environmental sciences |
| Zdroj: | Marine Geology. 419:106051 |
| ISSN: | 0025-3227 |
| DOI: | 10.1016/j.margeo.2019.106051 |
| Popis: | The sediment in North Atlantic blue holes preserves paleoclimate records. However, accurate paleoclimate reconstructions require an improved understanding of allogenic versus autogenic processes controlling blue hole sedimentation. Here we provide a detailed case study of the Holocene stratigraphy within Freshwater River Blue Hole, which is currently surrounded by carbonate tidal flats in the northern Bahamas (Abaco Island). During the Holocene, concomitant coastal aquifer elevation and relative sea-level rise controlled internal blue hole depositional environments. The general Holocene facies succession observed is: (i) basal detrital and freshwater peat, (ii) palustrine to lacustrine marl, (iii) algal sapropel, and finally (iv) bedded carbonate mud. During the middle Holocene when groundwater levels were lower, small changes in accommodation space that were inherited from the bedrock surface below ( |
| Databáze: | OpenAIRE |
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