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Holocene depositional evolution of Laguna del Maule (central Andes, Chile, 36° S): volcanic and paleoclimate implications

AuthorsFrugone-Álvarez, Matías; Latorre, Claudio; Giralt, Santiago ; Barreiro-Lostres, Fernando ; Polanco-Martínez, J.; Moreno, Ana; Bernárdez, Patricia ; Maldonado, Antonio; Carrevedo, María L.; Delgado Huertas, Antonio ; Prego, R. ; Valero Garcés, Blas
Issue Date18-Jun-2018
AbstractThe Laguna del Maule (LdM) volcanic field is one of the most seismically and volcanically active areas in the central-southern Andes, with intense postglacial and Holocene activity. We performed a seismic survey and collected a transect of sediment cores to study the depositional evolution of the lake located in the LdM caldera. This new high-resolution centennial-scale multi-proxy record provides insight into environmental and eruptive dynamics over the last 13.0 ka BP. Up to 18 ash and 5 lapilli layers mark volcanic events, which mostly cluster in the early and late Holocene with an extensive volcanic event at ~ 4.0 ka. Sedimentary facies and geochemical indicators (TOC, C/N, Br/Ti and Fe/Mn) are used to infer higher (lower) organic productivity during early and mid-Holocene (late Holocene) associated to lower (higher) water levels and dominant anoxic (oxic) conditions at the bottom of the lake. We attribute decreased lake levels between ~ 8.0 and 5.0 ka in part to lowered winter precipitation, which is coeval with a southward shift in the Southern Westerly Winds documented in other records, and a strengthening of the Pacific Subtropical High. Higher fluctuations in lake levels after 4.0¿3.0 ka BP are indicative of increased ENSO variability. Several important global climate transitions (LIA, 4.0, 8.0 and 11 ka) are well represented in the LdM sequence showing the importance of this record for reconstructing regional paleohydrology. Finally, periods of higher lake productivity during early and mid-Holocene were synchronous with elevated frequencies of volcanic events suggesting a climatic-volcanic synergy in limnological processes.
Appears in Collections:(ICTJA) Comunicaciones congresos
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