INVESTIGADORES
ZUCOL Alejandro Fabian
congresos y reuniones científicas
Título:
Análisis fitolítico de depósitos eólicos parcialmente edafizados (Pleistoceno Tardío-Holoceno) en la región de Tandilia (Provincia de Buenos Aires, Argentina).
Autor/es:
1. COLOBIG, M.M., PATTERER, N.I., ZUCOL, A.F., MARTÍNEZ, G. Y E. PASSEGGI.
Lugar:
La Plata
Reunión:
Congreso; IV Congreso Argentino de Cuaternario y Geomorfología,; 2009
Institución organizadora:
A. Cuat.
Resumen:
The phytolith
assemblages of aeolian depositional sequences with partially edaphic conditions (Late
Pleistocene- Holocene) from Tandilia region (Buenos Aires Province, Argentina) were
analyzed. Siliceous remains were obtained by densimetric separation (with sodium
polytungstate as heavy liquid) of the cleaned samples (with elimination of carbonates, organic
matter and dispersion of clastic elements). The multivariate analysis of phytolith assemblages
composition allows to differ two different groups across the studied profile. The lower
component was dominated by morphotypes with danthoniod affinity, the presence of arecoid
morphotypes, and a scarce presence of chloridoid, stipoid and panicoid elements. The upper
component of the sequence is characterized by a smaller abundance of danthoniod elements and
an important increase of phytoliths with stipoid and chloridoid affinity in the mean levels that
decreases towards the top of the profile where the relative frequency of panicoid phytoliths
increases. In this unit different ciperoid morphotypes were also observed. This analysis allows
to interpret that from the parental deposits, the development of this sequence was accompanied
in its initiated stages by a vegetation conformed by stipoid and chloridoid elements mainly, with
a scarce water availability. Later would have been replaced by a panicoid dominated
community, which added to the evidence of presence of sedges allows to suppose a superior
hydric availability.