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Chronostratigraphic correlations of cryogenic and glacigenic episodes in central andes with patagonia
Author(s) -
Corte Arturo E.
Publication year - 1991
Publication title -
permafrost and periglacial processes
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.867
H-Index - 76
eISSN - 1099-1530
pISSN - 1045-6740
DOI - 10.1002/ppp.3430020111
Subject(s) - geology , magnetostratigraphy , stratigraphy , paleontology , glacial period , paleoclimatology , permafrost , glacier , physical geography , paleomagnetism , climate change , oceanography , tectonics , geography
The stratigraphy of cryogenic and glacigenic episodes recorded in Central Andes at latitude 33º south is compared with the magnetostratigraphy of five (I‐V) main Patagonian glaciations. Most of the Central Andes cold episodes are relatively dated. A much older event (≈ 2.3 × 10 6 years BP ) is needed to explain the oldest and largest Central Andes glaciation, the sediments of which are tectonically deformed. This is the beginning of climatic change in the Central Andes. Ice‐wedge casts in till formed 3.5 × 10 6 years BP in southern Patagonia are related to an even older cold episode.