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A 7000-year high-resolution lake sediment record from coastal central Chile (Lago Vichuquén, 34°S): Implications for past sea level and environmental variability

AuthorsFrugone, M. ; Giralt, Santiago ; Valero-Garcés, Blas L.
KeywordsCentral Chile
Climate change
Coastal upwelling
Sea-level change
Issue Date2017
PublisherJohn Wiley & Sons
CitationJournal of Quaternary Science, 32(6): 830–844 (2017)
AbstractWe present a 7-ka environmental reconstruction based on sedimentological and geochemical data from Lago Vichuquén, a coastal eutrophic lake in central Chile (34°48'S, 72°03' W, 4m a.s.l.). A relatively shallow and restricted marine environment with low productivity, high detrital input and dominant anoxic conditions in the Vichuquén Basin occurred from 7.0 to 6.5cal ka BP. Rapid onset of a Holocene marine transgression at 6.5cal ka BP favoured deeper and more biologically productive environments that existed until 2.8 cal ka BP. Bioproductivity changes during the mid-Holocene (6.5-4.2cal ka BP) were related to upwelling dynamics controlled by the intensity of the South-east Pacific Anticyclone (SPA). Periods with lower organic productivity and dominant anoxic conditions reflect an increased intensity of SPA (increased upwelling) and decreased precipitation. A shift at ∼4.0cal ka BP reflects the onset of modern Southern Westerly Winds and El Niño-Southern Oscillation patterns. Tectonic uplifting and geormorphological activity (dune advancement) are possible reasons behind the Vichuquén Basin closure at ∼1.2cal ka BP, leading to a low bioproductivity lacustrine environment which has developed until the present. © 2017 John Wiley & Sons, Ltd.
DescriptionFrugone-Alvarez, M. et. al.
Publisher version (URL)http://dx.doi.org/10.1002/jqs.2936
Appears in Collections:(Geo3Bcn) Artículos
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