期刊
ANAIS DA ACADEMIA BRASILEIRA DE CIENCIAS
卷 79, 期 1, 页码 171-181出版社
ACAD BRASILEIRA DE CIENCIAS
DOI: 10.1590/S0001-37652007000100018
关键词
sedimentation; accumulation rate; upper slope; Southeastern Brazil
资金
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [03/10740-0] Funding Source: FAPESP
A first evaluation of the sedimentary changes, including accumulation of inorganic and organic carbon on the upper slope off Southeastern Brazil under different climatic conditions, based on the analysis of a sedimentary core, is here presented. Results indicate that sedimentation rate as well sedimentary characteristics, including the nature of the organic carbon deposited during the LGM ( Last Glacial Maximum), were different from the present deposition, indicating higher primary productivity during the LGM, to be accounted for by the higher values of marine organic carbon. Nevertheless, the higher values of Accumulation Rate of calcium carbonate and organic carbon can be credited to the higher values of the sedimentation rates. Conditions prevailing during Isotope Stage 3 may be considered intermediate as between the LGM and the present day. The conditions for a higher primary productivity associated with the deposition of finer terrigenous sediments may be explained as a response to the offshoreward displacement of the main flow of the Brazil Current.
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