Non-lithifying microbial ecosystem dissolves peritidal lime sand
| Autor: | Michael T. Thorpe, Theodore M. Present, Nathan Stein, Andrew H. Knoll, M. Cantine, Usha F. Lingappa, Elizabeth J. Trower, Woodward W. Fischer, M. L. Gomes, John D. Naviaux, John P. Grotzinger |
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| Rok vydání: | 2021 |
| Předmět: |
Geologic Sediments
010504 meteorology & atmospheric sciences West Indies Science Carbonates Geochemistry General Physics and Astronomy engineering.material 010502 geochemistry & geophysics 01 natural sciences Article General Biochemistry Genetics and Molecular Biology Calcium Carbonate chemistry.chemical_compound Sand Seawater Microbial mat Lithification Ecosystem 0105 earth and related environmental sciences Minerals Multidisciplinary Microbiota Aragonite Oxides General Chemistry Calcium Compounds Sedimentology Cementation (geology) Calcium carbonate chemistry Ooid engineering Carbonate Sedimentary rock |
| Zdroj: | Nature Communications, Vol 12, Iss 1, Pp 1-8 (2021) Nature Communications |
| ISSN: | 2041-1723 |
| DOI: | 10.1038/s41467-021-23006-1 |
| Popis: | Microbialites accrete where environmental conditions and microbial metabolisms promote lithification, commonly through carbonate cementation. On Little Ambergris Cay, Turks and Caicos Islands, microbial mats occur widely in peritidal environments above ooid sand but do not become lithified or preserved. Sediment cores and porewater geochemistry indicated that aerobic respiration and sulfide oxidation inhibit lithification and dissolve calcium carbonate sand despite widespread aragonite precipitation from platform surface waters. Here, we report that in tidally pumped environments, microbial metabolisms can negate the effects of taphonomically-favorable seawater chemistry on carbonate mineral saturation and microbialite development. Present et al. examine the processes controlling lithification of microbial mats in a Caribbean peritidal carbonate environment. The authors present sedimentological and geochemical evidence of a surprising bias against preserving the most robust, widespread microbial ecosystems in the sedimentary record. |
| Databáze: | OpenAIRE |
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