dc.creatorBellosi, Eduardo Sergio
dc.creatorKrause, Javier Marcelo
dc.date.accessioned2015-07-23T20:04:09Z
dc.date.accessioned2018-11-06T15:06:16Z
dc.date.available2015-07-23T20:04:09Z
dc.date.available2018-11-06T15:06:16Z
dc.date.created2015-07-23T20:04:09Z
dc.date.issued2013-07
dc.identifierBellosi, Eduardo Sergio; Krause, Javier Marcelo; Onset of the Middle Eocene global cooling and expansion of open-vegetation habitats in central Patagonia; Servicio Nacional Geologia Minerva; Andean Geology; 41; 7-2013; 29-48
dc.identifier0718-7092
dc.identifierhttp://hdl.handle.net/11336/1478
dc.identifier0718-7106
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1893828
dc.description.abstractClimate-driven changes in terrestrial environments and biomes after the Early Eocene Climatic Optimum are poorly documented from southern continents. Particularly, Middle Eocene-Early Oligocene leaf and pollen data from Central Patagonia (46oS, Argentina) are not sufficient to characterize floristic paleocommunities. Paleosols of the Cañadón Vaca (~45-42 Ma) and Gran Barranca (42-38.5 Ma) members (Sarmiento Formation), studied at Cañadón Vaca, solve such deficiency and help to reconstruct Middle Eocene landscapes in the beginning of the Cenozoic cooling-drying trend. Vitric Entisols, mollic Andisols and andic Alfisols, showing granular structure and diverse micropeds, are cyclically arranged mainly in response to variation in fine volcaniclastic eolian supply, which in turn governed ecosystem stability and maturity. Soils formed in loessic plains crossed by minor ephemeral rivers, supported open herbaceous-arboreal communities which grew in seasonal, subhumid and warm-temperate conditions. Phytoliths produced by Arecaceae, megathermic graminoids, sedges and dicots, from the upper part of the studied unit, represent subtropical savannas with grasses and variable number of palms and other trees. Considering the abundant paleobotanical and paleopedological antecedents of Late Paleocene-Early Eocene warm and humid forested environments in the same region, the lower Sarmiento Formation records the initial expansion of open herbaceous communities and the appearance of grassy habitats during the greenhouse to icehouse transition in the Middle Eocene.
dc.languageeng
dc.publisherServicio Nacional Geologia Minerva
dc.relationinfo:eu-repo/semantics/altIdentifier/url/http://www.scielo.cl/pdf/andgeol/v41n1/art02.pdf
dc.relationinfo:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.5027/andgeoV41n1-a02
dc.rightshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectPaleosol
dc.subjectPaleoclimate
dc.subjectGreenhouse-icehouse transition
dc.subjectOpen-herbaceous communities
dc.titleOnset of the Middle Eocene global cooling and expansion of open-vegetation habitats in central Patagonia
dc.typeArtículos de revistas
dc.typeArtículos de revistas
dc.typeArtículos de revistas


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