| Texto completo | |
| Autor(es): |
Maly, Mascimiliano de los Santos
;
de Mahiques, Michel Michaelovitch
;
Nagai, Renata Hanae
Número total de Autores: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | REGIONAL STUDIES IN MARINE SCIENCE; v. 70, p. 9-pg., 2024-01-05. |
| Resumo | |
Latitudinal modulation of proxies for environmental changes over the mid to late-Holocene was analyzed in four cores retrieved along mud depocenters on the South Brazilian Shelf, between 33.8 degrees S and 25.1 degrees S. To the south, early to mid-Holocene northwards migrations of the Southern Westerly Wind Belt (SWWB) and the post-LGM sea level rise are expressed as an increase in sand content, while the low Ti/Ca and Ti/K ratios point to dry climatic conditions. During the mid-Holocene, the sea level highstand coincided with a period of stabilization in atmospheric conditions, which led to a pulse of coarser sediment deposition in the southern area. In 3000 cal yr BP, a rapid and latitudinally simultaneous increase of Ti/Ca and Ti/K mark the late-Holocene more humid and warmer onset linked to an intensification of the South American Monsoon System (SAMS). Across-shelf branches of the Brazil Current (BC) that mix with the Plata Plume Water (PPW) to flow northwards could be responsible for sediment remobilization leading to clay depletion in the south extreme of the study area. The amplitude of grain size changes gets lower as we go further north, suggesting a buffering effect exerted by the distance to the source. (AU) | |
| Processo FAPESP: | 15/17763-2 - Mudbelts do Sul e Sudeste do Brasil: implicações sobre as influências antrópicas no ambiente marinho |
| Beneficiário: | Márcia Caruso Bícego |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 19/00256-1 - Geocronologia e sedimentação terrígena nos depocentros lamosos da plataforma continental do Sul do Brasil |
| Beneficiário: | Michel Michaelovitch de Mahiques |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |