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

We present a 7-ka environmental reconstruction based on sedimentological and geochemical data from Lago Vichuquen, a coastal eutrophic lake in central Chile (34 degrees 48'S, 72 degrees 03' W, 4 m a. s. l.). A relatively shallow and restricted marine environment with low productivity, high detrital input and dominant anoxic conditions in the Vichuquen Basin occurred from 7.0 to 6.5 cal ka BP. Rapid onset of a Holocene marine transgression at 6.5 cal ka BP favoured deeper and more biologically productive environments that existed until 2.8 cal ka BP. Bioproductivity changes during the mid-Holocene (6.5-4.2 cal 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 similar to 4.0 cal ka BP reflects the onset of modern Southern Westerly Winds and El Nino-Southern Oscillation patterns. Tectonic uplifting and geormorphological activity (dune advancement) are possible reasons behind the Vichuquen Basin closure at similar to 1.2 cal ka BP, leading to a low bioproductivity lacustrine environment which has developed until the present. Copyright (C) 2017 John Wiley & Sons, Ltd.