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Palacios D., Ruiz-Fernandez J., Oliva M., Andres N., Fernandez-Fernandez J. M., Schimmelpfennig I., Leanni Laetitia, Gonzalez-Diaz B., Aster Team. (2020). Timing of formation of neoglacial landforms in the South Shetland Islands (Antarctic Peninsula) : regional and global implications. Quaternary Science Reviews, 234, art. 106248 [24p.] ISSN 0277-3791

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Lien direct chez l'éditeur doi:10.1016/j.quascirev.2020.106248

Titre
Timing of formation of neoglacial landforms in the South Shetland Islands (Antarctic Peninsula) : regional and global implications
Année de publication2020
Type de documentArticle référencé dans le Web of Science WOS:000525791800008
AuteursPalacios D., Ruiz-Fernandez J., Oliva M., Andres N., Fernandez-Fernandez J. M., Schimmelpfennig I., Leanni Laetitia, Gonzalez-Diaz B., Aster Team.
SourceQuaternary Science Reviews, 2020, 234, art. 106248 [24p.] ISSN 0277-3791
RésuméThe timing of neoglacial advances in the Antarctic Peninsula (AP) is not yet well constrained. Accurate temporal reconstruction of Neoglaciation in the AP is needed to better understand past glacial responses and regional and global teleconnections during the Holocene. Here, we examine all available information about neoglacial advances in the South Shetland Islands (SSI) as well as in the broader geographical context of the AP region and Antarctic continent. In order to shed light on the contrasting chronologies existing for neoglacial advances in these regions, we focused on a case study where a detailed picture of the Holocene deglaciation was already available. Lake sediments revealed that Byers Peninsula, west of Livingston Island (SSI), was fully deglaciated during the Holocene Thermal Maximum. To complement this approach, we identified glacially polished bedrock surfaces, erratic boulders and a moraine ridge near the present front of the glacier in the SE corner. We applied cosmogenic ray exposure (CRE) dating using in situ Cl-36 for basalt rocks and Be-10 for granitic rocks in: (i) 8 samples from glacial erratic and ice-rafted boulders, (ii) 2 samples from moraine boulders, (iii) 2 samples from polished bedrock surfaces, and (iv) 1 sample from an erratic boulder deposited on one of these surfaces. The CRE dates indicate that the onset of deglaciation started around 9.9 +/- 1.2 ka, with two phases of glacier expansion during the Mid-Late Holocene forming moraines at similar to 4.1 +/- 0.5 and similar to 1.0 +/- 0.2 ka, respectively. The main neoglacial advances in the AP and the SSI were mostly synchronous and coincided with cold periods, as shown by other records (e.g. glacio-isostatic marine terraces, marine and lake sediments). In addition, these periods of glacial expansion show a similar timing to those recorded in the Arctic. These results suggest that Neoglaciation was driven by global climate forcing in both polar areas despite temporal variations at regional and local scale.
Plan de classementSciences du milieu [021] ; Géologie et formations superficielles [064]
Descr. géo.ANTARCTIQUE ; ; ANTARCTIQUE PENINSULE ; BYERS PENINSULE ; SHETLAND ILES ; LIVINGSTON ILE
LocalisationFonds IRD [F B010078983]
Identifiant IRDfdi:010078983
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010078983

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