This paper investigates several wedge structures formed in continental deposits covering marine sediments deposited during MIS 5 along the central Patagonian coast of Argentina. The size and surface microtexture characteristics of the infilling sediments are consistent with a depositional environment dominated by aeolian transport. Fragments of Andean volcanic rocks (glass shards) in the wedge-fill suggest long-distance transport via a westerly component of wind direction. The wedges are interpreted as products of deep seasonal frost action in frozen ground, which produced open cracks that filled rapidly with partially non-local aeolian sediments. Many wedges cross cut carbonate crusts that formed under permafrost conditions in coastal Patagonia. The radiocarbon dating of carbonate crusts yielded an age of 25-27 kyr bp, while wedge-fill sediments are OSL dated to 14670±750yr bp. This indicates that ground wedge formation occurred during a cold event (the Antarctic Cold Reversal period) that interrupted the permafrost degradation following the Last Glacial Maximum. © 2014 Swedish Society for Anthropology and Geography.

Ribolini, A., Bini, M., Consoloni, I., Isola, I., Pappalardo, M., Zanchetta, G., et al. (2014). Late-pleistocene wedge structures along the patagonian coast (argentina): Chronological constraints and palaeo-environmental implications. GEOGRAFISKA ANNALER. SERIES A, PHYSICAL GEOGRAPHY, 96(2), 161-176 [10.1111/geoa.12038].

Late-pleistocene wedge structures along the patagonian coast (argentina): Chronological constraints and palaeo-environmental implications

PANZERI, LAURA;MARTINI, MARCO
Penultimo
;
2014

Abstract

This paper investigates several wedge structures formed in continental deposits covering marine sediments deposited during MIS 5 along the central Patagonian coast of Argentina. The size and surface microtexture characteristics of the infilling sediments are consistent with a depositional environment dominated by aeolian transport. Fragments of Andean volcanic rocks (glass shards) in the wedge-fill suggest long-distance transport via a westerly component of wind direction. The wedges are interpreted as products of deep seasonal frost action in frozen ground, which produced open cracks that filled rapidly with partially non-local aeolian sediments. Many wedges cross cut carbonate crusts that formed under permafrost conditions in coastal Patagonia. The radiocarbon dating of carbonate crusts yielded an age of 25-27 kyr bp, while wedge-fill sediments are OSL dated to 14670±750yr bp. This indicates that ground wedge formation occurred during a cold event (the Antarctic Cold Reversal period) that interrupted the permafrost degradation following the Last Glacial Maximum. © 2014 Swedish Society for Anthropology and Geography.
Articolo in rivista - Articolo scientifico
Geology; Geography, Planning and Development
English
2014
96
2
161
176
none
Ribolini, A., Bini, M., Consoloni, I., Isola, I., Pappalardo, M., Zanchetta, G., et al. (2014). Late-pleistocene wedge structures along the patagonian coast (argentina): Chronological constraints and palaeo-environmental implications. GEOGRAFISKA ANNALER. SERIES A, PHYSICAL GEOGRAPHY, 96(2), 161-176 [10.1111/geoa.12038].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/84101
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