Geological, pedological and paleomagnetic study of the late Cenozoic sedimentary sequence in southwestern Uruguay, South America

The results of interdisciplinary studies carried out on the coastal cliffs of southern Uruguay are presented here. The Raigón Formation (late Pliocene-middle Pleistocene) has a cratonic provenance and comprises two sections limited by a regional discontinuity. Each section is composed of an associat...

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Autores principales: Tofalo, O.R., Orgeira, M.J., Morrás, H., Vásquez, C., Sánchez, L., Pecoits, E., Aubet, N., Sánchez, G., Zech, W., Moretti, L.
Formato: JOUR
Materias:
Cenozoic
cliff
climate variation
craton
discontinuity
floodplain
geochronology
interdisciplinary approach
lithofacies
magnetostratigraphy
paleoclimate
paleogeography
paleomagnetism
paleosol
pedogenesis
pedology
Pliocene-Pleistocene boundary
provenance
rhizolith
sedimentary sequence
sedimentation
stratification
South America
Uruguay
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_10406182_v210_n1-2_p6_Tofalo
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_10406182_v210_n1-2_p6_Tofalo
record_format dspace
spelling todo:paper_10406182_v210_n1-2_p6_Tofalo2023-10-03T15:57:56Z Geological, pedological and paleomagnetic study of the late Cenozoic sedimentary sequence in southwestern Uruguay, South America Tofalo, O.R. Orgeira, M.J. Morrás, H. Vásquez, C. Sánchez, L. Pecoits, E. Aubet, N. Sánchez, G. Zech, W. Moretti, L. Cenozoic cliff climate variation craton discontinuity floodplain geochronology interdisciplinary approach lithofacies magnetostratigraphy paleoclimate paleogeography paleomagnetism paleosol pedogenesis pedology Pliocene-Pleistocene boundary provenance rhizolith sedimentary sequence sedimentation stratification South America Uruguay The results of interdisciplinary studies carried out on the coastal cliffs of southern Uruguay are presented here. The Raigón Formation (late Pliocene-middle Pleistocene) has a cratonic provenance and comprises two sections limited by a regional discontinuity. Each section is composed of an association of lithofacies Ss, Sp, Sr, rare St, and Fm. The last one represents floodplain deposits and the others are interpreted as channel-filled deposits. In the upper part, a well-structured paleosol with clay coatings and abundant rhizoliths is observed in a sharp contact with silty deposits of the Libertad Fm. (early-middle Pleistocene); these sediments have a mixed provenance (magmatic arc and cratonic), sheet-like geometry, thick stratification and vertical walls, and are composed of lithofacies Fr. These characteristics suggest a loessic origin. A paleosol with illuvial B horizons and silty loam texture is recognized at the bottom of this unit. The recent soil (Argiudoll) is developed at the top of the Libertad Fm. The characteristics of the sequence indicate climatic fluctuations and several cycles of erosion, sedimentation and pedogenesis. According to magnetostratigraphy, the chronology is roughly compatible with that one based on the fossil contents and is in agreement with magnetic ages determined in Argentine fossiliferous sequences. © 2009 Elsevier Ltd and INQUA. Fil:Tofalo, O.R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Orgeira, M.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Vásquez, C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Sánchez, L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_10406182_v210_n1-2_p6_Tofalo
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Cenozoic
cliff
climate variation
craton
discontinuity
floodplain
geochronology
interdisciplinary approach
lithofacies
magnetostratigraphy
paleoclimate
paleogeography
paleomagnetism
paleosol
pedogenesis
pedology
Pliocene-Pleistocene boundary
provenance
rhizolith
sedimentary sequence
sedimentation
stratification
South America
Uruguay
spellingShingle Cenozoic
cliff
climate variation
craton
discontinuity
floodplain
geochronology
interdisciplinary approach
lithofacies
magnetostratigraphy
paleoclimate
paleogeography
paleomagnetism
paleosol
pedogenesis
pedology
Pliocene-Pleistocene boundary
provenance
rhizolith
sedimentary sequence
sedimentation
stratification
South America
Uruguay
Tofalo, O.R.
Orgeira, M.J.
Morrás, H.
Vásquez, C.
Sánchez, L.
Pecoits, E.
Aubet, N.
Sánchez, G.
Zech, W.
Moretti, L.
Geological, pedological and paleomagnetic study of the late Cenozoic sedimentary sequence in southwestern Uruguay, South America
topic_facet Cenozoic
cliff
climate variation
craton
discontinuity
floodplain
geochronology
interdisciplinary approach
lithofacies
magnetostratigraphy
paleoclimate
paleogeography
paleomagnetism
paleosol
pedogenesis
pedology
Pliocene-Pleistocene boundary
provenance
rhizolith
sedimentary sequence
sedimentation
stratification
South America
Uruguay
description The results of interdisciplinary studies carried out on the coastal cliffs of southern Uruguay are presented here. The Raigón Formation (late Pliocene-middle Pleistocene) has a cratonic provenance and comprises two sections limited by a regional discontinuity. Each section is composed of an association of lithofacies Ss, Sp, Sr, rare St, and Fm. The last one represents floodplain deposits and the others are interpreted as channel-filled deposits. In the upper part, a well-structured paleosol with clay coatings and abundant rhizoliths is observed in a sharp contact with silty deposits of the Libertad Fm. (early-middle Pleistocene); these sediments have a mixed provenance (magmatic arc and cratonic), sheet-like geometry, thick stratification and vertical walls, and are composed of lithofacies Fr. These characteristics suggest a loessic origin. A paleosol with illuvial B horizons and silty loam texture is recognized at the bottom of this unit. The recent soil (Argiudoll) is developed at the top of the Libertad Fm. The characteristics of the sequence indicate climatic fluctuations and several cycles of erosion, sedimentation and pedogenesis. According to magnetostratigraphy, the chronology is roughly compatible with that one based on the fossil contents and is in agreement with magnetic ages determined in Argentine fossiliferous sequences. © 2009 Elsevier Ltd and INQUA.
format JOUR
author Tofalo, O.R.
Orgeira, M.J.
Morrás, H.
Vásquez, C.
Sánchez, L.
Pecoits, E.
Aubet, N.
Sánchez, G.
Zech, W.
Moretti, L.
author_facet Tofalo, O.R.
Orgeira, M.J.
Morrás, H.
Vásquez, C.
Sánchez, L.
Pecoits, E.
Aubet, N.
Sánchez, G.
Zech, W.
Moretti, L.
author_sort Tofalo, O.R.
title Geological, pedological and paleomagnetic study of the late Cenozoic sedimentary sequence in southwestern Uruguay, South America
title_short Geological, pedological and paleomagnetic study of the late Cenozoic sedimentary sequence in southwestern Uruguay, South America
title_full Geological, pedological and paleomagnetic study of the late Cenozoic sedimentary sequence in southwestern Uruguay, South America
title_fullStr Geological, pedological and paleomagnetic study of the late Cenozoic sedimentary sequence in southwestern Uruguay, South America
title_full_unstemmed Geological, pedological and paleomagnetic study of the late Cenozoic sedimentary sequence in southwestern Uruguay, South America
title_sort geological, pedological and paleomagnetic study of the late cenozoic sedimentary sequence in southwestern uruguay, south america
url http://hdl.handle.net/20.500.12110/paper_10406182_v210_n1-2_p6_Tofalo
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