Paleoclimatic inferences for the Holocene of southern Brazil in environments influenced by different hydrological systems


Organic matter preserved in continental deposits is an excellent archive of environmental and climate change, and various research tools are commonly used to access this information. The present study is the result of a study conducted in continental environments influenced by different hydrological systems and demonstrates the usefulness of these analyses in obtaining rainfall-related paleoclimatic data. The study area is located in the basalts of the Alto Uruguai region (Rio Grande do Sul, Brazil), known for its mineral riches such as amethyst geodes and hot springs. The methodology used integrates palynofacies and organic geochemistry techniques, complemented by radiocarbon dating. The results were obtained from three sedimentary profiles and showed a trend of relative decrease in rainfall levels in the region. However, the scale of these changes is also highly influenced by the hydrological system of the depositional environment that originated the sedimentary record at each site. Based on the data obtained, we advise the establishment of medium- and long-term policies involving better management of local natural resources in the investigated region.



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Author Biographies

Margot Guerra Sommer, Programa de Pós-Graduação em Geociências, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brasil

Departamento de Paleontologia e Estratigrafia

João Graciano Mendonça-Filho, Programa de Pós-Graduação em Geologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, Brasil

Departamento de Geologia


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How to Cite
GADENS MARCON, Gabrielli Teresa; SOMMER, Margot Guerra; MENDONÇA-FILHO, João Graciano. Paleoclimatic inferences for the Holocene of southern Brazil in environments influenced by different hydrological systems. Acta Brasiliensis, [S.l.], v. 4, n. 2, p. 99-105, may 2020. ISSN 2526-4338. Available at: <>. Date accessed: 04 aug. 2020. doi: