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Glacially striated, soft sediment surfaces on late Paleozoic tillite at São Luiz do Purunã, PR Anais da ABC (AABC)
Trosdtorf Jr.,Ivo; Assine,Mario L.; Vesely,Fernando F.; Rocha-Campos,Antonio C.; Santos,Paulo R. dos; Tomio,Alexandre.
Striae and furrows found on the upper surfaces of three stratigraphically superposed decimetric beds of late Paleozoic lodgement tillite of the Itararé Subgroup in the northern Paraná Basin were engraved by ploughing of clasts and possibly also ice protuberances at the base of the glacier, on unconsolidated to partially consolidated sediment. Associated features indicate that the rheology of the bed varied from stiff during lodgement to soft and deformable during ploughing. Poor drainage of meltwater at the glacier-bed interface may have contributed to lower the strength of sediment to deformation. The deformed interval was probably generated during a single glacial phase or advance of a glacier grounding in a marine or lacustrine water body. Changes in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Glacially striated surfaces; Soft sediments; Itararé Subgroup; Late Paleozoic.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000200013
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