A 14 kyr record of the tropical Andes: The Lago Chungará sequence (18°S, northern Chilean Altiplano)

A. Moreno, S. Giralt, B. Valero-Garcés, A. Sáez, R. Bao, R. Prego, J. J. Pueyo, P. González-Sampériz, C. Taberner

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Abstract

High-resolution geochemical analyses obtained using an X-ray fluorescence (XRF) Core Scanner, as well as mineralogical data from the Lago Chungará sedimentary sequence in the northern Andean Chilean Altiplano (18°S), provided a detailed reconstruction of the lacustrine sedimentary evolution during the last 14,000 cal. yr BP. The high-resolution analyses attained in this study allowed to distinguish abrupt periods, identify the complex structures of the early and mid-Holocene arid intervals and to compare their timing with Titicaca lake and Sajama ice records. Three main components in the lake sediments have been identified: (a) biogenic component, mainly from diatoms (b) volcanics (ash layers) from the nearby Parinacota Volcano and (c) endogenic carbonates. The correlation between volcanic input in Lago Chungará and the total particles deposited in the Nevado Sajama ice core suggests the Parinacota Volcano as the common source. The geochemical record of Lago Chungará indicates an increase in siliceous productivity during the early Holocene, lagging behind the rise in temperatures inferred from the Nevado Sajama ice core. The regional mid-Holocene aridity crisis can be characterized as a number of short events with calcite and aragonite precipitation in the offshore lake zones.

Original languageEnglish (US)
Pages (from-to)4-21
Number of pages18
JournalQuaternary International
Volume161
Issue number1
DOIs
StatePublished - Feb 2007

Bibliographical note

Funding Information:
We are indebted to the Limnological Research Center staff who participated in the field expedition (D. Schnurremberger, M. Shapley and A. Myrbo) and collaborated during the initial core descriptions, as well as the CONAF (Corporación Nacional Forestal, Chile) for the facilities provided in Chungará. We acknowledge C. Herrera (Universidad Católica del Norte, Chile) for his help during the field expedition. We are very grateful to L. Edwards (University of Minnesota) and R.O. Gibert (University of Barcelona) for the ICP-IRMS U/Th dating and to S. Fritz for providing the Titicaca diatom data. The University of Bremen, particularly U. Röhl, F. Lamy, M. Kölling, H. Pfletschinger and H. Kuhlmann are acknowledged for technical assistance with the XRF-Core Scanner, powder XRF and ICP-OES analyses. We also acknowledge M. Grosjean and N. Piotrowska for their advice in age model construction and R. Rycroft for the English correction. The Paleostudies programme (European Science Foundation) provided the necessary funding to carry out the analyses at the University of Bremen. This study is supported by the projects BTE2001-3225 and BTE2001-5257-E and CGL2004-00683/BTE funded by the CICYT, the Spanish Ministry of Science and Technology. A. Moreno and P. González-Sampériz are the recipients of a CSIC research contract (I3P postdoctoral programme). S. Giralt acknowledges the Spanish Ministry of Science and Technology for his postdoctoral contract in the Ramón y Cajal programme.

Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.

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