Caracterização paleoambiental da região de Guarapuava-PR, a partir de sedimento de turfa: um estudo de caso

Abstract

The present work presents the results of a survey that aimed to present an idea of how the setting was in the area of environmental Guarapuava - PR. This goal became the face of scarcity and the need to have more accurate data on the paleoenvironment of the region. To this end, we used a testimony collected from sedimentary peat Guara, located on the elevated portions of the reverse slope of Hope, Third Plateau of Paraná. Primarily through analysis of proxy data in the case phytoliths, in association with dating by 14C and isotopic data, it was possible to establish three phases paleoambietais, which range from the lower Pleistocene to the present. You could say that peat Guara initiated the formation of your deposit is 15,648 years BP. In an environment of more closed vegetation, strongly marked by individuals of type C3. Second time the reduction in water availability, possibly favored the introduction of more open vegetation (C4) and allowed the peat deposit advance by greater accumulation of material. At the end of this time has been introducing new elements C3. You could say that this phase marked the passing of the Pleistocene to the Holocene and lasted until the mid Holocene. From this point, we have the third phase. Practically stable in the environment with respect to humidity and temperature, but with the introduction of new trend element C4. However the region of Peat Guara, even showing two fronts opening of vegetation, was never formed by vegetation field itself, and as the base of the deposit is marked by closed vegetation is suggestive that the region of peat can Guara have been a safe haven during the forest Plesitoceno late.