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EnglishA long-lasting Cenozoic record (similar to 50 m.y.) of alkaline igneous rocks characterizes northern Victoria Land, Antarctica, Landscape analysis allows distinction between older volcanic and intrusive rocks with well-developed alpine topography sculptured by wet-based glaciers, and younger volcanic cones lacking these features. Many K-Ar and Rb-Sr dates testify that the erosion that formed the alpine landscape ceased between ca, 8.2 and 7.5 Ma, Since ca, 8 Ma, morphological evolution has been driven by cold-based glaciers; warm-based glaciers were no longer active. That this change affected a 300-km-long coastal area suggests a persistent cause of global significance. Glacier dynamics control landscape shaping as a function of ice thickness and temperature, which are driven by climatic conditions. In this view, a significant climatic change occurred in northern Victoria Land between 8.2 and 7.5 Ma. The perfectly preserved serrated alpine ridges, with their delicate spires, testify that no warm-based ice sheets overrode the region after 7.5 Ma and that polar conditions held sway in the Pliocene and Pleistocene Epochs.
| Autori interni: | ||
| Autori: | ARMIENTI P; BARONI C | |
| Titolo: | Cenozoic climatic change in Antarctica recorded by volcanic activity and landscape evolution | |
| Anno del prodotto: | 1999 | |
| Digital Object Identifier (DOI): | 10.1130/0091-7613(1999)027<0617:CCCIAR>2.3.CO;2 | |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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http://hdl.handle.net/11568/189463
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