Micromorphological aspects of glaciolacustrine sediments in Northern Patagonia,Argentina |
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| Authors: | Aap J M Der Van Meer Orge O Rabassa Dward B Evenson |
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| 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. |
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| Keywords: | Patagonia micromorphology glaciolacustrine glaciotectonics |
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