Glacial to periglacial transition at the end of the last ice age in the subtropical semiarid Andes

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dc.article.number109379
dc.catalogadorpva
dc.contributor.authorGarcía B., Juan Luis
dc.contributor.authorCarraha Molina, Javiera Paz
dc.contributor.authorFernández Navarro, Hans Andrés
dc.contributor.authorNussbaumer, Samuel U.
dc.contributor.authorPérez Mora, Francia Débora
dc.contributor.authorHidy, Alan J.
dc.contributor.authorGärtner-Roer, Isabelle
dc.contributor.authorHaeberli, Wilfried
dc.date.accessioned2025-01-06T20:44:27Z
dc.date.available2025-01-06T20:44:27Z
dc.date.issued2024
dc.description.abstractAtmospheric warming and circulation reorganization at the end of the last ice age represent the most important climate change of the last 100,000 years and provide an opportunity to uncover how the southern subtropics cryosphere responded to strong changes in the global climate system. Extensive mapping and chronologic records on cryogenic landforms to better understand the association and interactions between glaciers and viscous creep of ice-rich permafrost landforms (rock glaciers) are widely missing in the region. In this paper, we reconstruct the geomorphic imprint of the Last Glacial Maximum (LGM) and the Termination I in the high Andes of the Río Limarí Basin (30–31°S) in the subtropical semiarid Andes of Chile. 74 new 10Be surface exposure dating ages constrain the timing of glaciation, deglaciation, and glacial to periglacial transition. Glacial advances occurred first by 41.2 ± 0.6 – 35.0 ± 0.5 ka during Marine Isotope Stage 3, but probably earlier also; then, a second advance occurred during the global LGM between 24.2 ± 0.4 and 18.6 ± 0.2 ka. Deglaciation by 17.6 ± 0.2 ka left extensive hummocky moraines on the main valleys. Characteristic patterns of furrows and ridges typical of rock glaciers and solifluction superimposed on the LGM hummocky moraine indicate ice-rich permafrost in glacial deposits likely between 15.5 ± 0.3 and 13.6 ± 0.3 ka. We propose that moraines deposited by LGM debris-covered glaciers served as a niche for strong seasonal frost and permafrost creep, which substantially modified the original landforms. Our results contribute to a better understanding of major transformations in an ice-rich high mountain area of the southern hemisphere where the interplay of temperature and precipitation changes drove glacial to periglacial transitions.
dc.description.funderFONDECYT
dc.description.funderSwiss National Science Foundation
dc.format.extent24 páginas
dc.fuente.origenSCOPUS
dc.identifier.doi10.1016/j.geomorph.2024.109379
dc.identifier.issn0169-555X
dc.identifier.scopusidSCOPUS_ID:85201717089
dc.identifier.urihttps://doi.org/10.1016/j.geomorph.2024.109379
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/89534
dc.information.autorucInstituto de Geografía; García B., Juan Luis; 0000-0002-9028-7572; 9823
dc.information.autorucInstituto de Geografía; Carraha Molina, Javiera Paz; S/I; 246469
dc.information.autorucInstituto de Geografía; Fernández Navarro, Hans Andrés; S/I; 1049886
dc.information.autorucInstituto de Historia; Pérez Mora, Francia Débora; S/I; 1085970
dc.language.isoen
dc.nota.accesocontenido parcial
dc.publisherElsevier B.V.
dc.revistaGeomorphology
dc.rightsacceso restringido
dc.subject10Be surface exposure dating
dc.subjectGlaciation
dc.subjectPeriglaciation
dc.subjectSouthern Westerly Winds (SWW)
dc.subjectSubtropical Andes
dc.subject.ddc900
dc.subject.deweyHistoria y geografíaes_ES
dc.subject.ods13 Climate action
dc.subject.ods14 Life below water
dc.subject.odspa13 Acción por el clima
dc.subject.odspa14 Vida submarina
dc.titleGlacial to periglacial transition at the end of the last ice age in the subtropical semiarid Andes
dc.typeartículo
dc.volumen465
sipa.codpersvinculados9823
sipa.codpersvinculados246469
sipa.codpersvinculados1049886
sipa.codpersvinculados1085970
sipa.trazabilidadSCOPUS;2024-09-15
sipa.trazabilidadORCID;2025-01-06
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