How Could a Freshwater Swamp Produce a Chemical Signature Characteristic of a Saltmarsh?
| Autor: | Kam-biu Liu, Marci E. Marot, Christopher G. Smith, Christian Haller, Terrence A. McCloskey |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Atmospheric Science
geography geography.geographical_feature_category Marsh 010504 meteorology & atmospheric sciences Bedrock Geochemistry 010502 geochemistry & geophysics 01 natural sciences Swamp Diagenesis chemistry.chemical_compound chemistry Space and Planetary Science Geochemistry and Petrology Salt marsh Carbonate Sedimentary rock Transect Geomorphology Geology 0105 earth and related environmental sciences |
| Zdroj: | ACS Earth and Space Chemistry. 2:9-20 |
| ISSN: | 2472-3452 |
| DOI: | 10.1021/acsearthspacechem.7b00098 |
| Popis: | Reduction–oxidation (redox) reaction conditions, which are of great importance for the soil chemistry of coastal marshes, can be temporally dynamic. We present a transect of cores from northwest Florida wherein radical postdepositional changes in the redox regime has created atypical geochemical profiles at the bottom of the sedimentary column. The stratigraphy is consistent along the transect, consisting of, from the bottom upward, carbonate bedrock, a gray clay, an organic mud section, a dense clay layer, and an upper organic mud unit representing the current saltwater marsh. However, the geochemical signature of the lower organic mud unit suggests pervasive redox reactions, although the interval has been identified as representing a freshwater marsh, an unlikely environment for such conditions. Analyses indicate that this discrepancy results from postdepositional diagenesis driven by millennial-scale environmental parameters. Rising sea level that led to the deposition of the capping clay layer, create... |
| Databáze: | OpenAIRE |
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