Multi-millennial scale climate variability during MIS 3 and MIS 2 inferred from luminescence dating of coastal sand dunes and buried paleosol sequences in central Chile, 32 degrees S

García, Juan?Luis; Andrade, Belisario; Calderón, Mauricio; Lüthgens, Christopher

Keywords: coastal sand dunes, paleosols, central Chile paleoclimate, pIRIR225, southern westerlies.

Abstract

The eolian morphostratigraphic archive along the coast of central Chile (similar to 37-30 degrees S) includes sand dune and buried paleosol sequences that despite their potential as a proxy for past environmental change, remain mostly unstudied north of Patagonia and south of the Atacama Desert core. Here, we present results of a stratigraphic and geochronologic study using the post-infrared infrared stimulated luminescence signal stimulated at 225 degrees C (pIRIR225) of potassium-rich feldspar that show the timing of past climate variability as evidenced from sand dune/buried paleosol couplets at 32 degrees S. Our record shows that periods of sand dune accumulation during Marine Isotope Stages MIS 6, 4, 3 and 2 occurred within ice ages and associated low sea-level stands, probably affected by similar to, or drier than, present conditions. Intercalated wetter periods inferred from pedogenesis occurred between 53 +/- 4 and 52 +/- 3 ka, at some time between 52 +/- 3 and 36 +/- 2 ka, and at some time between 31 +/- 2 and 22 +/- 2 ka, and reflect times when the southern westerlies rain belt shifted north. Our data reveal that central Chile experienced multi-millennial periodicity of westerly precipitation throughout the last glacial period. We provide evidence for a humid local Last Glacial Maximum.

Más información

Título según WOS: Multi-millennial scale climate variability during MIS 3 and MIS 2 inferred from luminescence dating of coastal sand dunes and buried paleosol sequences in central Chile, 32 degrees S
Título según SCOPUS: Multi-millennial scale climate variability during MIS 3 and MIS 2 inferred from luminescence dating of coastal sand dunes and buried paleosol sequences in central Chile, 32°S
Título de la Revista: JOURNAL OF QUATERNARY SCIENCE
Volumen: 34
Número: 3
Editorial: Wiley
Fecha de publicación: 2019
Página de inicio: 203
Página final: 214
Idioma: English
DOI:

10.1002/jqs.3092

Notas: ISI, SCOPUS - WOS ISI