Chronological reconstruction of eolianites and transversal mobile dunes of northwest coast of Ceará State – Brazil, in the last 3000 cal yrs BP
| Autor: | João Wagner Alencar Castro, Alvaro Balmant Passemilio, Julia Varella Malta, Lucas Lavo António Jimo Miguel, Caique Lima Cabral |
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| Rok vydání: | 2017 |
| Předmět: |
010504 meteorology & atmospheric sciences
biology Lithostratigraphy Geology 010502 geochemistry & geophysics biology.organism_classification 01 natural sciences law.invention Foraminifera law Paleoclimatology Period (geology) Aeolian processes Physical geography Radiocarbon dating Geomorphology Holocene 0105 earth and related environmental sciences Earth-Surface Processes Chronology |
| Zdroj: | Aeolian Research. 28:51-57 |
| ISSN: | 1875-9637 |
| DOI: | 10.1016/j.aeolia.2017.07.006 |
| Popis: | Dunefields are very common in the northern coastal zone of northeast Brazil. They have the potential to yield important information about paleoclimate, paleo-winds and regional winds and their response to sea-level fluctuations during the Holocene. We reconstructed the coastal dunes geochronological evolution of northwest Ceara State – Brazil, in the last 3000 cal yrs BP, using detailed analyses of lithostratigraphy, microfossil (foraminifera), wind regime, dune monitoring and 8 radiocarbon dates. The chronology was based on 14 C dating in eolianites and monitoring transversal mobile dunes movement processes. Radiocarbon date results indicated that the dunes corresponding to eolianites revealed ages between 2760–2480 and 980–750 cal yrs BP, suggesting that the vast transversal mobile dunefields were formed after this period in similar condition to the current sea-level. We considered that the material transportation by the prevailing east winds towards the transversal dunes is estimated in the order of 11.0 m/year, thus the current aeolian system is less than 1000 yrs BP. |
| Databáze: | OpenAIRE |
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