INVESTIGADORES
ZARATE Marcelo Aristides
artículos
Título:
Late Glacial?Holocene climatic transition record at the Argentinian Andean piedmont between 33 and 34◦ S
Autor/es:
ADRIANA MEHL; MARCELO ZÁRATE
Revista:
CLIMATE OF THE PAST
Editorial:
COPERNICUS PUBLICATIONS
Referencias:
Lugar: Gottingen; Año: 2014 vol. 10 p. 863 - 876
ISSN:
1814-9324
Resumen:
The Arroyo La Estacada (∼ 33◦280 S, 69◦020 W),
eastern Andean piedmont of Argentina, cuts through an extensive
piedmont aggradational unit composed of a dominant
Late Pleistocene?early Holocene (LP?EH) alluvial sequence
that includes several paleosols.
One of these paleosols developed affecting the topmost
part of likely Late Glacial aeolian deposits aggraded into a
floodplain environment by the end of the Late Pleistocene.
The paleosol shows variable grade of development along the
arroyo outcrops. Organic matter humification, carbonate accumulation
and redox processes were the dominant processes
associated with paleosol formation. By the early Holocene,
when the formation of the paleosol ended, renewed alluvial
aggradation and high magnitude flooding events affected the
arroyo?s floodplain environment. Accordignly, a period of
relative landscape stability in the Arroyo La Estacada basin
is inferred from the paleosol developed by the LP?EH transition
in response to the climatic conditions in the Andes
cordillera piedmont after the Late Glacial arid conditions.
The analyzed Late Glacial?Holocene alluvial record of the
Andean piedmont constitutes a suitable record of the LP?EH
climatic transition in the extra-Andean region of Argentina.
It is in agreement with regional paleoclimatic evidence along
the southern tip of the South American continent, where
other pedosedimentary sequences record similar late Quaternary
paleoenvironmental changes over both fluvial and
interfluvial area