Blard, P.-H. and Sylvestre, F. and Tripati, A. K. and Claude, C. and Causse, C. and Coudrain, A. and Condom, T. and Seidel, J. -L. and Vimeux, F. and Moreau, C. and Dumoulin, J. -P. and Lavé, J. (2011) Lake highstands on the Altiplano (Tropical Andes) contemporaneous with Heinrich 1 and the Younger Dryas: new insights from ^(14)C, U-Th dating and δ^(18)O of carbonates. Quaternary Science Reviews, 30 (27-28). pp. 3973-3989. ISSN 0277-3791 http://resolver.caltech.edu/CaltechAUTHORS:20120213-121729361
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This study provides new geochronological and stable isotope constraints on Late Pleistocene fluctuations in lake level that occurred in the closed-watershed of the Central Altiplano between ~25 and ~12 ka. U-series isochrons and ^(14)C ages from carbonates are used to confirm and refine the previous chronology published (Placzek et al., 2006b). Our new data support three successive lake highstands during the Late Pleistocene: (i) the Lake Sajsi cycle, from ~25 to 19 ka, that culminated at 3670 m at about 22 ka, almost synchronously with the global last glacial maximum, (ii) the Lake Tauca cycle, that lasted from 18 to 14.5 ka and was characterized by the highest water level, reached at least 3770 m from 16.5 to 15 ka, (iii) the Lake Coipasa cycle, from 12.5 to 11.9 ka, that reached an elevation of ~3700 m, 42 m above the elevation of the Salar de Uyuni (3658 m). These high amplitude lake level fluctuations are in phase with the cold-warm oscillations that occurred in the North Atlantic and Greenland during the Late Pleistocene (Heinrich 1, Bølling-Allerød, Younger Dryas). Such temporal coincidence supports the hypothesis that wet events recorded in the Central Altiplano are controlled by the northesouth displacement of the Inter Tropical Convergence Zone resulting from changes in the meridional temperature gradient. Finally, the oxygen isotope ratios measured in these lacustrine carbonates allows for calculation of the δ^(18)O value of paleolake waters. Estimates of water δ^(18)O (V-SMOW) are -2.8 ± 0.7‰ for Lake Tauca and -1.6 ± 0.9‰ for Lake Coipasa. These data are used to constrain changes in lake hydrology and can be interpreted to indicate that the proportion of precipitation arising from local water recycling was less than 50%.
|Additional Information:||© 2011 Elsevier Ltd. Received 22 July 2011; Received in revised form: 29 October 2011; Accepted 2 November 2011. Jean-Marie Rouchy (Museum National d’Histoire Naturelle) is kindly thanked for providing us very well characterized samples. This work was funded by the French Programs INSU “Relief de la Terre” and “EVE-LEFE” and by NSF. Radiocarbon dating was performed at the Laboratoire de Mesure du Carbone 14 (LMC14) e UMS 2572 (CEA/DSM e CNRS e IRD e IRSN e Ministère de la Culture et de la Communication) at Gif sur Yvette, France, on the 14C AMS facility ARTEMIS. John Eiler is thanked for providing us access to his stable isotope lab at Caltech. Christa Placzek, Jay Quade and Jon Patchett are thanked for their constructive reviews that helped us improving the submitted version of the manuscript. This contribution greatly benefited from the long term scientific collaborative framework existing between l’Institut de Recherche pour le Développement (IRD) and la Universidad Mayor de San Andrés, La Paz. This is CRPG contribution no. 2139.|
|Subject Keywords:||Tropics; Altiplano; Lake; Tauca; Coipasa; Heinrich 1; Younger Dryas; UeTh; U-series dating; 14C; δ13C; δ18O|
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|Official Citation:||P.-H. Blard, F. Sylvestre, A.K. Tripati, C. Claude, C. Causse, A. Coudrain, T. Condom, J.-L. Seidel, F. Vimeux, C. Moreau, J.-P. Dumoulin, J. Lavé, Lake highstands on the Altiplano (Tropical Andes) contemporaneous with Heinrich 1 and the Younger Dryas: new insights from 14C, U–Th dating and δ18O of carbonates, Quaternary Science Reviews, Volume 30, Issues 27–28, December 2011, Pages 3973-3989, ISSN 0277-3791, 10.1016/j.quascirev.2011.11.001.|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||14 Feb 2012 21:01|
|Last Modified:||14 Feb 2012 21:01|
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