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Climate of the Past An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/cp-2019-147
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-2019-147
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 22 Jan 2020

Submitted as: research article | 22 Jan 2020

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This preprint is currently under review for the journal CP.

Volcanism and climate change as drivers in Holocene depositional dynamic of Laguna del Maule (Andes of central Chile – 36° S)

Matías Frugone-Álvarez1,2,3, Claudio Latorre1,2,3, Fernando Barreiro-Lostres2,4, Santiago Giralt5, Ana Moreno2,4, Josué Polanco-Martínez6,7, Antonio Maldonado8,9, María Laura Carrevedo2, Patricia Bernárdez10, Ricardo Prego11, Antonio Delgado Huertas12, Magdalena Fuentealba1,3, and Blas Valero-Garcés2,4 Matías Frugone-Álvarez et al.
  • 1Departamento de Ecología & Centro UC Desierto de Atacama, Pontificia Universidad Católica de Chile, Santiago, Chile
  • 2Laboratorio Internacional de Cambio Global, LINCGlobal PUC-CSIC-UFRJ
  • 3Instituto de Ecología y Biodiversidady (IEB), Santiago, Chile
  • 4Instituto Pirenaico de Ecología (IPE-CSIC), Zaragoza, Spain
  • 5Institute of Earth Sciences Jaume Almera (ICTJA-CSIC), Barcelona, Spain
  • 6Econometrics Research Group, Institute of Public Economics, University of the Basque Country, Bilbao, Spain
  • 7Basque Centre for Climate Change (BC3), Leioa, Spain
  • 8Universidad Católica del Norte, Coquimbo, Región de Coquimbo, Chile
  • 9Centro de Estudios Avanzados en Zonas Áridas. Universidad de La Serena, La Serena, Chile
  • 10Instituto de Investigaciones Marinas (IIM-CSIC), Vigo, Spain
  • 11Marine Geosciences and Territorial Planning, Edificio de Ciencias Experimentales, University of Vigo, Vigo, Spain
  • 12Instituto Andaluz de Ciencias de la Tierra (IACT-CSIC), Granada, Spain

Abstract. Late Quaternary volcanic basins are active landscapes from which detailed archives of past climate, seismic and volcanic activity can be obtained. A multidisciplinary study performed on a transect of sediment cores was used to reconstruct the depositional evolution of the high-elevation Laguna del Maule (LdM) (36° S, 2180 m asl, Chilean Andes). The recovered 5 m composite sediment sequence includes two thick turbidite units (LT1 and LT2) and numerous tephra layers (23 ash and 6 lapilli). We produced an age model is based on nine new 14C AMS date, existing 210Pb and 137Cs data and the Quizapú ash horizon (CE 1932). According to this age model, early Holocene were followed by a phase of increased productivity during the mid Holocene and higher lake levels after 4.0 ka BP. Major hydroclimate transitions occurred at ca. 0.5, 4.0, 8.0 and 11 ka BP. Decreased summer insolation and winter precipitation due to a southward shift in the Southern Westerly Winds and a strengthened Pacific Subtropical High could explain early Holocene lower lake levels. Increased biological productivity during the mid-Holocene (~ 8.0 to 6.0 ka) is coeval with a warm-dry phase described for much of southern South America. Periods of higher lake productivity are synchronous to higher frequency of volcanic events. During the late Holocene, the tephra layers shows compositional changes suggesting a transition from silica-rich to silica-poor magmas at around 4.0 cal ka BP. This transition was synchronous with increased variability of sedimentary facies and geochemical proxies, indicating higher lake levels and increased moisture at LdM after 4.0 cal ka BP, most likely caused by the inception of current ENSO/PDO-like dynamics in central Chile.

Matías Frugone-Álvarez et al.

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Matías Frugone-Álvarez et al.

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Short summary
The manuscript identifies the main volcanic phases in the Laguna del Maule volcanic field and their impact in the lake basin through the late glacial and Holocene. We show that the bio-productivity and geochemical variabilities in the lake are related with climatic dynamics type ENSO, SPA and SWW and that the main phases are synchronous with the major regional climate changes on millennial timescales.
The manuscript identifies the main volcanic phases in the Laguna del Maule volcanic field and...
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