Silt-sized sediments and gypsum on surface formations in the Ebro Basin

The term "gypsiferous silts" has been used since the 1960s by many authors, but it has relied on unclear, am-biguous criteria that attributed aeolian, colluvial or alluvial origins to these materials. The aim of this paper is to clarify the use of the term "gypsiferous silts" app...

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Autores: Poch, Rosa M.|||0000-0001-8639-4204, Rodríguez-Ochoa, Rafael|||0000-0002-5929-4221, Artieda, Octavio|||0000-0001-6004-8215, Balasch, Josep Carles|||0000-0001-5970-1918, Boixadera, Jaume|||0000-0002-0258-0761
Tipo de recurso: artículo
Fecha de publicación:2021
País:España
Institución:Universitat Autònoma de Barcelona
Repositorio:Dipòsit Digital de Documents de la UAB
Idioma:inglés
OAI Identifier:oai:ddd.uab.cat:250168
Acceso en línea:https://ddd.uab.cat/record/250168
https://dx.doi.org/urn:doi:10.1344/GeologicaActa2021.19.8
Access Level:acceso abierto
Palabra clave:Weathering
Micromorphology
Pedogenesis
Gypsiferous soils
Loess
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spelling Silt-sized sediments and gypsum on surface formations in the Ebro Basina disambiguation of the term "gypsiferous silts"Poch, Rosa M.|||0000-0001-8639-4204Rodríguez-Ochoa, Rafael|||0000-0002-5929-4221Artieda, Octavio|||0000-0001-6004-8215Balasch, Josep Carles|||0000-0001-5970-1918Boixadera, Jaume|||0000-0002-0258-0761WeatheringMicromorphologyPedogenesisGypsiferous soilsLoessThe term "gypsiferous silts" has been used since the 1960s by many authors, but it has relied on unclear, am-biguous criteria that attributed aeolian, colluvial or alluvial origins to these materials. The aim of this paper is to clarify the use of the term "gypsiferous silts" applied to silt-sized, gypsum-bearing sediments on surface forma-tions in the Ebro Basin, using published and unpublished information. We distinguished three types of materials with very different characteristics that had all been attributed to the general term "gypsiferous silts" in previously published work: i) gypsiferous silts sensu stricto, ii) loess and iii) flour-like gypsum. The recommendations of our study are that the first two terms should be applied to gypsum-containing sediments located in varied topographic positions with calcium carbonate contents up to 40-50% and coarse silty to fine sandy textures. Loess normally appears as thick outcrops (up to 12m) on slopes leeward from the main wind direction, with a limited pedogenesis consisting of a partial carbonate mobilisation and gypsum contents between 0 and 30%. Loess is the only category with an aeolian origin. The materials in the category "gypsiferous silts" sensu stricto are mainly colluvial-alluvial. The third term (flour-like gypsum) should be used to refer to materials on surface formations consisting of almost 100% silt- to fine sand size lenticular gypsum. These materials derive from on-site weathering of gyprock or by precipitation from calcium- and sulphate-saturated groundwater and surficial waters and show a variable spatial distribution: along footslopes, outcropping as metric surface formations, interstratified between limestone layers or as generalized karstified subsurface accumulations.The proposed classification, based on morphological and physico-chemical characteristics, establishes a neces-sary distinction among the three types of materials, since they differ in their properties and geotechnical behaviour relevant for soil management and land use. Using the proposed classification will allow their distinct characteristics can be taken into account when performing geological or soil surveys in this and similar arid regions. 22021-01-0120212021-01-01Articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://ddd.uab.cat/record/250168https://dx.doi.org/urn:doi:10.1344/GeologicaActa2021.19.8reponame:Dipòsit Digital de Documents de la UABinstname:Universitat Autònoma de BarcelonaInglésengopen accesshttp://purl.org/coar/access_right/c_abf2Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l'obra original i es reconegui l'autoria.https://creativecommons.org/licenses/by-sa/4.0/info:eu-repo/semantics/openAccessoai:ddd.uab.cat:2501682026-06-06T12:50:31Z
dc.title.none.fl_str_mv Silt-sized sediments and gypsum on surface formations in the Ebro Basin
a disambiguation of the term "gypsiferous silts"
title Silt-sized sediments and gypsum on surface formations in the Ebro Basin
spellingShingle Silt-sized sediments and gypsum on surface formations in the Ebro Basin
Poch, Rosa M.|||0000-0001-8639-4204
Weathering
Micromorphology
Pedogenesis
Gypsiferous soils
Loess
title_short Silt-sized sediments and gypsum on surface formations in the Ebro Basin
title_full Silt-sized sediments and gypsum on surface formations in the Ebro Basin
title_fullStr Silt-sized sediments and gypsum on surface formations in the Ebro Basin
title_full_unstemmed Silt-sized sediments and gypsum on surface formations in the Ebro Basin
title_sort Silt-sized sediments and gypsum on surface formations in the Ebro Basin
dc.creator.none.fl_str_mv Poch, Rosa M.|||0000-0001-8639-4204
Rodríguez-Ochoa, Rafael|||0000-0002-5929-4221
Artieda, Octavio|||0000-0001-6004-8215
Balasch, Josep Carles|||0000-0001-5970-1918
Boixadera, Jaume|||0000-0002-0258-0761
author Poch, Rosa M.|||0000-0001-8639-4204
author_facet Poch, Rosa M.|||0000-0001-8639-4204
Rodríguez-Ochoa, Rafael|||0000-0002-5929-4221
Artieda, Octavio|||0000-0001-6004-8215
Balasch, Josep Carles|||0000-0001-5970-1918
Boixadera, Jaume|||0000-0002-0258-0761
author_role author
author2 Rodríguez-Ochoa, Rafael|||0000-0002-5929-4221
Artieda, Octavio|||0000-0001-6004-8215
Balasch, Josep Carles|||0000-0001-5970-1918
Boixadera, Jaume|||0000-0002-0258-0761
author2_role author
author
author
author
dc.subject.none.fl_str_mv Weathering
Micromorphology
Pedogenesis
Gypsiferous soils
Loess
topic Weathering
Micromorphology
Pedogenesis
Gypsiferous soils
Loess
description The term "gypsiferous silts" has been used since the 1960s by many authors, but it has relied on unclear, am-biguous criteria that attributed aeolian, colluvial or alluvial origins to these materials. The aim of this paper is to clarify the use of the term "gypsiferous silts" applied to silt-sized, gypsum-bearing sediments on surface forma-tions in the Ebro Basin, using published and unpublished information. We distinguished three types of materials with very different characteristics that had all been attributed to the general term "gypsiferous silts" in previously published work: i) gypsiferous silts sensu stricto, ii) loess and iii) flour-like gypsum. The recommendations of our study are that the first two terms should be applied to gypsum-containing sediments located in varied topographic positions with calcium carbonate contents up to 40-50% and coarse silty to fine sandy textures. Loess normally appears as thick outcrops (up to 12m) on slopes leeward from the main wind direction, with a limited pedogenesis consisting of a partial carbonate mobilisation and gypsum contents between 0 and 30%. Loess is the only category with an aeolian origin. The materials in the category "gypsiferous silts" sensu stricto are mainly colluvial-alluvial. The third term (flour-like gypsum) should be used to refer to materials on surface formations consisting of almost 100% silt- to fine sand size lenticular gypsum. These materials derive from on-site weathering of gyprock or by precipitation from calcium- and sulphate-saturated groundwater and surficial waters and show a variable spatial distribution: along footslopes, outcropping as metric surface formations, interstratified between limestone layers or as generalized karstified subsurface accumulations.The proposed classification, based on morphological and physico-chemical characteristics, establishes a neces-sary distinction among the three types of materials, since they differ in their properties and geotechnical behaviour relevant for soil management and land use. Using the proposed classification will allow their distinct characteristics can be taken into account when performing geological or soil surveys in this and similar arid regions.
publishDate 2021
dc.date.none.fl_str_mv 2
2021-01-01
2021
2021-01-01
dc.type.none.fl_str_mv Article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://ddd.uab.cat/record/250168
https://dx.doi.org/urn:doi:10.1344/GeologicaActa2021.19.8
url https://ddd.uab.cat/record/250168
https://dx.doi.org/urn:doi:10.1344/GeologicaActa2021.19.8
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
https://creativecommons.org/licenses/by-sa/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
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eu_rights_str_mv openAccess
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dc.source.none.fl_str_mv reponame:Dipòsit Digital de Documents de la UAB
instname:Universitat Autònoma de Barcelona
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