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Micromorphological aspects of glaciolacustrine sediments in Northern Patagonia, Argentina

1992; Wiley; Volume: 7; Issue: 1 Linguagem: Inglês

10.1002/jqs.3390070104

1099-1417

Aap J. M. Der Van Meer, Orge O. Rabassa, Dward B. Evenson,

Pleistocene-Era Hominins and Archaeology

Abstract In this study the sedimentology, micromorphology and structure of four deformation es in end moraines or near‐end moraine settings are presented. Micromorphology has proven be a powerful tool in the interpretation of the sediments. The four sites are related to three of the four major glaciations known from this part of Patagonia: Nahuel Huapi, Anfiteatro and Pichileufú. All four sites are characterised by glaciolacustrine vironments in which sedimentation occurred at least partly on and/or against dead ice. With the exception of one section in the San Martin de los Andes area, where deformation occurred active ice‐push, all major disturbances (faults and folds) are the result of dead ice collapse. Comparison with micromorphological observations on basal tills shows that the sediments all lack clear subglacial imprint.