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| Format: | Artículo científico |
| Language: | en |
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Academia Brasileira de Ciências
2005
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| Online Access: | https://www.redalyc.org/articulo.oa?id=32777213 |
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Table of 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