Composition and Flux of Holocene Sediments on the Eastern Laptev Sea Shelf, Arctic Siberia
| Autor: | Olga D. Naidina, Martina Kunz-Pirrung, Heidemarie Kassens, Jörn Thiede, Henning A. Bauch |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
010506 paleontology
geography geography.geographical_feature_category 010504 meteorology & atmospheric sciences Continental shelf Fluvial Sediment 01 natural sciences Sedimentary depositional environment Oceanography Arts and Humanities (miscellaneous) 13. Climate action River mouth General Earth and Planetary Sciences Sedimentary rock 14. Life underwater Holocene Sea level Geology 0105 earth and related environmental sciences Earth-Surface Processes |
| Zdroj: | Quaternary Research, 55 (3). pp. 344-351. |
| ISSN: | 1096-0287 0033-5894 |
| Popis: | A 467-cm-long core from the inner shelf of the eastern Laptev Sea provides a depositional history since 9400 cal yr. B.P. The history involves temporal changes in the fluvial runoff as well as postglacial sea-level rise and southward retreat of the coastline. Although the core contains marine fossils back to 8900 cal yr B.P., abundant plant debris in a sandy facies low in the core shows that a river influenced the study site until ∼8100 cal yr B.P. As sea level rose and the distance to the coast increased, this riverine influence diminished gradually and the sediment type changed, by 7400 cal yr B.P., from sandy silt to clayey silt. Although total sediment input decreased in a step-like fashion from 7600 to 4000 cal yr B.P., this interval had the highest average sedimentation rates and the greatest fluxes in most sedimentary components. While this maximum probably resulted from middle Holocene climate warming, the low input of sand to the site after 7400 cal yr B.P. probably resulted from further southward retreat of the coastline and river mouth. Since about 4000 cal yr B.P., total sediment flux has remained rather constant in this part of the Laptev Sea shelf due to a gradual stabilization of the depositional regime after completion of the Holocene sea-level rise. |
| Databáze: | OpenAIRE |
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