Study of the distribution of Elphidium aff poeyanum (D?Orbigny) and Buccella peruviana (D?Orbigny) from the Colorado basin (South America): Holocene paleoenvironmental inferences.

BERNASCONI, E.; CUSMINSKY, G

HOLOCENE (SEVENOAKS)

SAGE PUBLICATIONS LTD

Lugar: London; Año: 2015 vol. 25 p. 810 - 819

0959-6836

AbstractBenthic foraminiferal assemblages recovered from T1 core samples of the Colorado basin, in the continental margin of southeastern Argentina, wereanalyzed to understand their distribution patterns and ecological preferences. The foraminiferal assemblages showed two well-represented species:Elphidium aff. poeyanum (d?Orbigny) and Buccella peruviana (d?Orbigny), among others of very low proportion. Statistical analyses allowed identifyingpositive correlations between the abundance of E. aff. poeyanum and silt content and between B. peruviana and the sand content, reflecting betterconditions for the development of both species. From a paleoenvironmental point of view, the assemblages recorded are characteristic of an inner shelf,showing a passage from typical shallow waters to normal marine conditions; such a passage represents a rise in the sea level during the post-last glacialmaximum transgression. The results obtained contribute to the knowledge of South American foraminifers and paleoenvironments during the Holocene.