Onset of the Middle Eocene global cooling and expansion of open-vegetation habitats in central Patagonia

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...

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Autores principales:	Bellosi,Eduardo S, Krause,J. Marcelo
Lenguaje:	English
Publicado:	Servicio Nacional de Geología y Minería (SERNAGEOMIN) 2014
Materias:	Paleosol Paleoclimate Greenhouse-icehouse transition Open-herbaceous communities
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062014000100002
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spelling	oai:scielo:S0718-710620140001000022014-03-24Onset of the Middle Eocene global cooling and expansion of open-vegetation habitats in central PatagoniaBellosi,Eduardo SKrause,J. Marcelo Paleosol Paleoclimate Greenhouse-icehouse transition Open-herbaceous communities 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.info:eu-repo/semantics/openAccessServicio Nacional de Geología y Minería (SERNAGEOMIN)Andean geology v.41 n.1 20142014-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062014000100002en10.5027/andgeoV41n1-a02
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Paleosol Paleoclimate Greenhouse-icehouse transition Open-herbaceous communities
spellingShingle	Paleosol Paleoclimate Greenhouse-icehouse transition Open-herbaceous communities Bellosi,Eduardo S Krause,J. Marcelo Onset of the Middle Eocene global cooling and expansion of open-vegetation habitats in central Patagonia
description	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.
author	Bellosi,Eduardo S Krause,J. Marcelo
author_facet	Bellosi,Eduardo S Krause,J. Marcelo
author_sort	Bellosi,Eduardo S
title	Onset of the Middle Eocene global cooling and expansion of open-vegetation habitats in central Patagonia
title_short	Onset of the Middle Eocene global cooling and expansion of open-vegetation habitats in central Patagonia
title_full	Onset of the Middle Eocene global cooling and expansion of open-vegetation habitats in central Patagonia
title_fullStr	Onset of the Middle Eocene global cooling and expansion of open-vegetation habitats in central Patagonia
title_full_unstemmed	Onset of the Middle Eocene global cooling and expansion of open-vegetation habitats in central Patagonia
title_sort	onset of the middle eocene global cooling and expansion of open-vegetation habitats in central patagonia
publisher	Servicio Nacional de Geología y Minería (SERNAGEOMIN)
publishDate	2014
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-71062014000100002
work_keys_str_mv	AT bellosieduardos onsetofthemiddleeoceneglobalcoolingandexpansionofopenvegetationhabitatsincentralpatagonia AT krausejmarcelo onsetofthemiddleeoceneglobalcoolingandexpansionofopenvegetationhabitatsincentralpatagonia
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Onset of the Middle Eocene global cooling and expansion of open-vegetation habitats in central Patagonia

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