Show simple item record Roberts, Nicholas J. Barendregt, René W. Clague, John J. 2020-02-07T21:59:05Z 2020-02-07T21:59:05Z 2017
dc.identifier.citation Roberts, 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/srep41878 en_US
dc.description Sherpa Romeo green journal. Open access article. Creative Commons Attribution 4.0 International License (CC by 4.0) applies en_US
dc.description.abstract The 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.language.iso en_US en_US
dc.publisher Nature Research en_US
dc.subject Glaciation en_US
dc.subject Pliocene glaciations
dc.subject Global warmth
dc.subject Tropical Andes
dc.subject Animal migration
dc.subject Cryospheric science
dc.subject Paleoclimate
dc.subject Palaeomagnetism
dc.subject.lcsh Glaciers--Andes
dc.subject.lcsh Cryosphere
dc.subject.lcsh Paleoclimatology
dc.subject.lcsh Sedimentology
dc.title Multiple tropical Andean glaciations during a period of late Pliocene warmth en_US
dc.type Article en_US
dc.publisher.faculty Arts and Science en_US
dc.publisher.department Department of Geography en_US
dc.description.peer-review Yes en_US
dc.publisher.institution Simon Fraser University en_US
dc.publisher.institution University of Lethbridge en_US

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