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dc.contributor.author
Bellosi, Eduardo Sergio
dc.contributor.author
Krause, Javier Marcelo
dc.date.available
2015-07-23T20:04:09Z
dc.date.issued
2013-07
dc.identifier.citation
Bellosi, 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.identifier.issn
0718-7092
dc.identifier.uri
http://hdl.handle.net/11336/1478
dc.description.abstract
Climate-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.format
application/pdf
dc.language.iso
eng
dc.publisher
Servicio Nacional Geologia Minerva
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Paleosol
dc.subject
Paleoclimate
dc.subject
Greenhouse-Icehouse Transition
dc.subject
Open-Herbaceous Communities
dc.subject.classification
Geociencias multidisciplinaria
dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Onset of the Middle Eocene global cooling and expansion of open-vegetation habitats in central Patagonia
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2016-03-30 10:35:44.97925-03
dc.identifier.eissn
0718-7106
dc.journal.volume
41
dc.journal.pagination
29-48
dc.journal.pais
Chile
dc.journal.ciudad
Santiago de Chile
dc.description.fil
Fil: Bellosi, Eduardo Sergio. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales; Argentina;
dc.description.fil
Fil: Krause, Javier Marcelo. Museo Paleontologico Egidio Feruglio; Argentina;
dc.journal.title
Andean Geology
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.scielo.cl/pdf/andgeol/v41n1/art02.pdf
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.5027/andgeoV41n1-a02


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