Chronostratigraphy and lake-level changes of Laguna Cari-Laufquén, Río Negro, Argentina |
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| Authors: | Alyson Cartwright Jay Quade Scott Stine Kenneth D Adams Wallace Broecker Hai Cheng |
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| Institution: | aUniversity of Arizona, Department of Geosciences, Tucson, AZ, 85721, USA;bCalifornia State University East Bay, Department of Geography and Environmental Sciences, Hayward, CA, 94542, USA;cDesert Research Institute, Division of Earth and Ecosystem Sciences, Reno, NV, 89512, USA;dColumbia University, Lamont-Doherty Earth Observatory, New York, NY, 10027, USA;eUniversity of Minnesota, Department of Geology and Geophysics, Minneapolis, MN, 55455, USA;fInstitute of Global Environmental Change, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China |
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| Abstract: | Evidence from shoreline and deep-lake sediments show Laguna Cari-Laufquén, located at 41°S in central Argentina, rose and fell repeatedly during the late Quaternary. Our results show that a deep (> 38 m above modern lake level) lake persisted from no later than 28 ka to 19 ka, with the deepest lake phase from 27 to 22 ka. No evidence of highstands is found after 19 ka until the lake rose briefly in the last millennia to 12 m above the modern lake, before regressing to present levels. Laguna Cari-Laufquén broadly matches other regional records in showing last glacial maximum (LGM) highstands, but contrasts with sub-tropical lake records in South America where the hydrologic maximum occurred during deglaciation (17–10 ka). Our lake record from Cari-Laufquén mimics that of high-latitude records from the Northern Hemisphere. This points to a common cause for lake expansions, likely involving some combination of temperature depression and intensification of storminess in the westerlies belt of both hemispheres during the LGM. |
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| Keywords: | Argentina Paleolakes Carbon-14 Last glacial maximum Shoreline |
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