Glacially striated, soft sediment surfaces on late Paleozoic tillite at São Luiz do Purunã, PR
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| Format: | Artículo científico |
| Langue: | en |
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Academia Brasileira de Ciências
2005
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| _version_ | 1876440286865915904 |
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| author | Ivo Trosdtorf |
| author_facet | Ivo Trosdtorf |
| contents | Glacially striated, soft sediment surfaces on late Paleozoic tillite at São Luiz do Purunã, PR Ivo Trosdtorf Mario L. Assine Fernando F. Vesely Antonio C. Rocha-Campos Paulo R. Dos Santos Alexandre Tomio Multidisciplinaria (Ciencias Naturales y Exactas) softsediments latePaleozoic ItararéSubgroup glaciallystriatedsurfaces StriaeandfurrowsfoundontheuppersurfacesofthreestratigraphicallysuperposeddecimetricbedsoflatePaleozoiclodgementtilliteoftheItararéSubgroupinthenorthernParanáBasinwereengravedbyploughingofclastsandpossiblyalsoiceprotuberancesatthebaseoftheglacier,onunconsolidatedtopartiallyconsolidatedsediment.Associatedfeaturesindicatethattherheologyofthebedvariedfromstiffduringlodgementtosoftanddeformableduringploughing.Poordrainageofmeltwaterattheglacier-bedinterfacemayhavecontributedtolowerthestrengthofsedimenttodeformation.Thedeformedintervalwasprobablygeneratedduringasingleglacialphaseoradvanceofaglaciergroundinginamarineorlacustrinewaterbody.Changesinthedynamicsoftheglacierinvolvingslowandfastflowwerecorrelatedrespectivelywithalternationofdepositionanderosion.TheproposedmodelisanalogoustothatoflodgementtillcomplexesfromthePleistoceneofthenorthernhemisphere.Retreatoftheglacierwasprobablyfast,followedbysettlingofmudsontopoftheupperstriatedandfurrowedsurface,andprogradationofdeltaicsandsduringpost-glacialtime. 2005 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32777213 en http://www.redalyc.org/revista.oa?id=327 Anais da Academia Brasileira de Ciências application/pdf Academia Brasileira de Ciências Anais da Academia Brasileira de Ciências (Brasil) Num.2 Vol.77 |
| format | Artículo científico |
| id | redalyc_32777213 |
| institution | Redalyc |
| language | en |
| publishDate | 2005 |
| publisher | Academia Brasileira de Ciências |
| spellingShingle | Glacially striated, soft sediment surfaces on late Paleozoic tillite at São Luiz do Purunã, PR Ivo Trosdtorf Multidisciplinaria (Ciencias Naturales y Exactas) softsediments latePaleozoic ItararéSubgroup glaciallystriatedsurfaces Glacially striated, soft sediment surfaces on late Paleozoic tillite at São Luiz do Purunã, PR Ivo Trosdtorf Mario L. Assine Fernando F. Vesely Antonio C. Rocha-Campos Paulo R. Dos Santos Alexandre Tomio Multidisciplinaria (Ciencias Naturales y Exactas) softsediments latePaleozoic ItararéSubgroup glaciallystriatedsurfaces StriaeandfurrowsfoundontheuppersurfacesofthreestratigraphicallysuperposeddecimetricbedsoflatePaleozoiclodgementtilliteoftheItararéSubgroupinthenorthernParanáBasinwereengravedbyploughingofclastsandpossiblyalsoiceprotuberancesatthebaseoftheglacier,onunconsolidatedtopartiallyconsolidatedsediment.Associatedfeaturesindicatethattherheologyofthebedvariedfromstiffduringlodgementtosoftanddeformableduringploughing.Poordrainageofmeltwaterattheglacier-bedinterfacemayhavecontributedtolowerthestrengthofsedimenttodeformation.Thedeformedintervalwasprobablygeneratedduringasingleglacialphaseoradvanceofaglaciergroundinginamarineorlacustrinewaterbody.Changesinthedynamicsoftheglacierinvolvingslowandfastflowwerecorrelatedrespectivelywithalternationofdepositionanderosion.TheproposedmodelisanalogoustothatoflodgementtillcomplexesfromthePleistoceneofthenorthernhemisphere.Retreatoftheglacierwasprobablyfast,followedbysettlingofmudsontopoftheupperstriatedandfurrowedsurface,andprogradationofdeltaicsandsduringpost-glacialtime. 2005 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32777213 en http://www.redalyc.org/revista.oa?id=327 Anais da Academia Brasileira de Ciências application/pdf Academia Brasileira de Ciências Anais da Academia Brasileira de Ciências (Brasil) Num.2 Vol.77 |
| title | Glacially striated, soft sediment surfaces on late Paleozoic tillite at São Luiz do Purunã, PR |
| topic | Multidisciplinaria (Ciencias Naturales y Exactas) softsediments latePaleozoic ItararéSubgroup glaciallystriatedsurfaces |
| url | https://www.redalyc.org/articulo.oa?id=32777213 |