| Autor: |
Marcelo Zárate, Nat Rutter, Andrea Coronato, Jorge Rabassa, Karin F. Helmens |
| Rok vydání: |
2012 |
| Předmět: |
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| Zdroj: |
SpringerBriefs in Earth System Sciences ISBN: 9789400743984 |
| DOI: |
10.1007/978-94-007-4399-1_2 |
| Popis: |
The Bogota basin and direct surroundings (eastern Andes in Colombia) holds a long sedimentary sequence that reaches from the present into the Miocene. Palaeo-botanical data indicates tectonic uplift by some 2,000 m during the Late Miocene–Pliocene that probably precluded sufficiently high enough terrain to support glaciers during the time period preceding the Quaternary. The first mountain glaciation as recorded by glaciofluvial sedimentation in the Bogota basin is dated by fission-track and magnetic polarity dating at ca. 2.6 Ma, whereas a shift towards more extensive glaciations occurred after ca. 0.8 Ma. Moraines preserved in the Bogota mountains record a series of glacial events for the time interval ca. 43 to 12.5 ka BP. Equilibrium Line Altitude (ELA) depression by ca. 1,300 m is reconstructed for the early Last Glacial Maximum (LGM; ca. 20 ka BP). |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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