Diatom record of the last 1400 years in Laguna Pululos Jujuy, Argentina
DOI:
https://doi.org/10.25260/EA.16.25.3.0.173Abstract
This paper presents high-resolution (multi-decadal) paleoenvironmental data of the last 1400 years in the northwestern sector of the dry Puna, Jujuy Province (Argentina). This information results from the analysis of the diatom assemblies recovered from sediment core samples collected at Laguna Pululos (22º32'43'' S; 66º48'25'' W), a shallow lake located at 4557 m.a.s.l. In this work we present and discuss the main results regarding the species composition of the diatom assemblages, and the observed paleoenvironmental trends related to the main characteristics and chronology of the medieval climatic anomaly (MCA) and little ice age (LIA). The results of the study indicate the onset of very arid conditions between ~800 and 1500 AD, and a sharp change to moister conditions from the latter period until the end of the XIX century. Noteworthy, two periods could be recognized, one between 600 and 800 AD (the moistest phase of the last 1400 years), and between 1366 and 1463 AD (a particularly arid phase). These periods recorded in Laguna Pululos apparently shared characteristics with the MCA and LIA, although, showing differences with chronologies found in the North Hemisphere, with an extended span of the arid conditions during the MCA in comparison with other paleoenvironmental records of the Andes.References
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Copyright (c) 2016 Marcelo R. Morales, Sabrina Bustos, Nora I. Maidana
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