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Glacial retreat history of Nanhuta Shan (north-east Taiwan) from preserved glacial features: the cosmic ray exposure perspective.

Lionel Siame 1 H.-T. Chu 2 J. Carcaillet 1 D. Bourles 1 Regis Braucher 1 W.-C. Lu 2 J. Angelier 3 Philippe Dussouillez 1
1 CEREGE - Centre européen de recherche et d'enseignement des géosciences de l'environnement
2 Central Geological Survey
3 GEOAZUR 6526 - Géoazur
Abstract : Taiwan, located at the junction of the Pacific Ocean, the Eurasian continent, and the South China marginal Sea, is of particular interest for reconstructing paleoclimate periods in Eastern Asia. This study reports the first cosmic ray exposure dating (CRE) of glacial features in Taiwan. Among the areas where glacial relicts have been described in Taiwan, the Nanhuta Shan range is probably the place where glacial landforms are best preserved. We consequently focused on this area combining glacial geomorphology observations together with CRE dating using in situ produced 10Be of erratic boulders and ice-sculpted surfaces. When combined with the geomorphic characteristics of the sampled areas, the obtained minimum CRE ages suggest that the glacial retreat in the Nanhuta Shan commenced about 10±3 ka ago and retreat was complete by 7±1 ka ago. This is consistent with the Holocene warming trend deduced from other biological and physico-chemical paleoclimatic records for the region. Estimates of local bedrock surface denudation rates either directly from in situ produced 10Be measurements or from geomorphic considerations are employed to determine the preservation of such glacial features within the highly dynamic setting of Taiwan.
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https://hal-insu.archives-ouvertes.fr/insu-00351030
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Submitted on : Thursday, January 8, 2009 - 11:33:24 AM
Last modification on : Wednesday, October 14, 2020 - 4:07:14 AM

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Lionel Siame, H.-T. Chu, J. Carcaillet, D. Bourles, Regis Braucher, et al.. Glacial retreat history of Nanhuta Shan (north-east Taiwan) from preserved glacial features: the cosmic ray exposure perspective.. Quaternary Science Reviews, Elsevier, 2007, 26 (17-18), pp.2185 à 2200. ⟨10.1016/j.quascirev.2007.04.016⟩. ⟨insu-00351030⟩

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