Portal de Periódicos da CAPES

Artigo Acesso aberto Produção Nacional

BIBTEX RIS

Palaeoenvironmental significance of allochthonous vs. autochthonous late Quaternary ostracodes from Imaruí Lagoon and d’Una River, southern Brazil

2006; Volume: 9; Issue: 3 Linguagem: Inglês

10.4072/rbp.2006.3.04

2236-1715

João Carlos Coimbra,

Isotope Analysis in Ecology

Late Quaternary ostracodes collected from 15 cores in two adjacent localities, Imaruí and D'Una River, both in Santa Catarina State, southern Brazil, were analyzed.Among the 12 identified species, only three are left in open nomenclature.The population age-structure was studied in order to distinguish between allochthonous vs. autochthonous ostracodes in each sample.Two typically mixohaline species, Cyprideis multidentata Hartmann and C. salebrosa Bold, are the most abundant autochthonous fossils in the cores.The taphonomic analysis and the sedimentological evidences allow the inference of a permanent lagoonal palaeoenvironment in the 15 cores.Micropalaeontological and geological data suggest that the marine species were transported into the lagoonal palaeoenvironment, reworked with the autochthonous mixohaline fauna and deposited along the lagoonal border.