Multiple tropical Andean glaciations during a period of late Pliocene warmth

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dc.contributor.authorRoberts, Nicholas J.
dc.contributor.authorBarendregt, René W.
dc.contributor.authorClague, John J.
dc.date.accessioned2020-02-07T21:59:05Z
dc.date.available2020-02-07T21:59:05Z
dc.date.issued2017
dc.descriptionSherpa Romeo green journal. Open access article. Creative Commons Attribution 4.0 International License (CC by 4.0) appliesen_US
dc.description.abstractThe extent and behaviour of glaciers during the mid-Piacenzian warm period illustrate the sensitivity of the cryosphere to atmospheric CO2 concentrations above pre-industrial levels. Knowledge of glaciation during this period is restricted to globally or regionally averaged records from marine sediments and to sparse terrestrial glacial deposits in mid-to-high latitudes. Here we expand the Pliocene glacial record to the tropics by reporting recurrent large-scale glaciation in the Bolivian Andes based on stratigraphic and paleomagnetic analysis of a 95-m sequence of glacial sediments underlying the 2.74-Ma Chijini Tuff. Paleosols and polarity reversals separate eight glacial diamictons, which we link to cold periods in the benthic oxygen isotope record. The glaciations appear to coincide with the earliest glacial activity at high northern latitudes and with events in Antarctica, including the strong M2 cold peak and terminal Pliocene climate deterioration. This concordance suggests inter-hemispheric climate linkages during the late Pliocene and requires that the Central Andes were at least as high in the late Pliocene as today. Our record fills a critical gap in knowledge of Earth systems during the globally warm mid-Piacenzian and suggests a possible driver of faunal migration preceding the large-scale biotic interchange in the Americas during the earliest Pleistocene.en_US
dc.description.peer-reviewYesen_US
dc.identifier.citationRoberts, N. J., Barendregt, R. W., & Clague, J. J. (2017). Multiple tropical Andean glaciations during a period of late Pliocene warmth. Scientific Reports, 7, 41878. doi: 10.1038/srep41878en_US
dc.identifier.urihttps://hdl.handle.net/10133/5676
dc.language.isoen_USen_US
dc.publisherNature Researchen_US
dc.publisher.departmentDepartment of Geographyen_US
dc.publisher.facultyArts and Scienceen_US
dc.publisher.institutionSimon Fraser Universityen_US
dc.publisher.institutionUniversity of Lethbridgeen_US
dc.publisher.urlhttps://doi.org/10.1038/srep41878
dc.subjectGlaciationen_US
dc.subjectPliocene glaciations
dc.subjectGlobal warmth
dc.subjectTropical Andes
dc.subjectAnimal migration
dc.subjectCryospheric science
dc.subjectPaleoclimate
dc.subjectPalaeomagnetism
dc.subject.lcshGlaciers--Andes
dc.subject.lcshCryosphere
dc.subject.lcshPaleoclimatology
dc.subject.lcshSedimentology
dc.titleMultiple tropical Andean glaciations during a period of late Pliocene warmthen_US
dc.typeArticleen_US
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