Cosmogenic 10Be exposure dating of glacial erratics on Horseshoe Island in western Antarctic Peninsula confirms rapid deglaciation in the Early Holocene

Attila Çiner, Cengiz Yildirim, M. Akif Sarikaya, Yeong Bae Seong, Byung Yong Yu

Araştırma sonucu: ???type-name???Makalebilirkişi

6 Atıf (Scopus)

Özet

The rapid warming observed in the western Antarctic Peninsula gives rise to a fast disintegration of ice shelves and thinning and retreat of marine-terminating continental glaciers, which is likely to raise global sea levels in the near future. In order to understand the contemporary changes in context and to provide constraints for hindcasting models, it is important to understand the Late Quaternary history of the region. Here, we build on previous work on the deglacial history of the western Antarctic Peninsula and we present four new cosmogenic 10Be exposure ages from Horseshoe Island in Marguerite Bay, which has been suggested as a former location of very fast ice stream retreat. Four samples collected from erratic pink granite boulders at an altitude of ~80 m above sea level yielded ages that range between 12.9 ± 1.1 ka and 9.4 ± 0.8 ka. As in other studies on Antarctic erratics, we have chosen to report the youngest erratic age (9.4 ± 0.8 ka) as the true age of deglaciation, which confirms a rapid thinning of the Marguerite Trough Ice Stream at the onset of Holocene. This result is consistent with other cosmogenic age data and other proxies (marine and lacustrine 14C and optically stimulated luminescence) reported from nearby areas.

Orijinal dilİngilizce
Sayfa (başlangıç-bitiş)319-331
Sayfa sayısı13
DergiAntarctic Science
Hacim31
Basın numarası6
DOI'lar
Yayın durumuYayınlandı - 1 Ara 2019

Bibliyografik not

Publisher Copyright:
Copyright © Antarctic Science Ltd 2019.

Finansman

This study was carried out under the auspices of the Turkish Republic Presidency, supported by the Ministry of Science, Industry and Technology and coordinated by the Istanbul Technical University (ITU) Polar Research Center (PolReC) and the ITU Research Fund (BAP) Project No. 9. We thank the Chilean captains and crew of the Antarctic Warrior vessel and our colleagues who helped us during the fieldwork. We also thank Greg Balco who created the ICE-D Antarctica database, which allows the comparison of data across the continent. We are grateful to Mike Bentley and an anonymous reviewer for their constructive suggestions, which greatly improved the quality of the paper.

FinansörlerFinansör numarası
ITU Research Fund
International Technological University
British Association for Psychopharmacology9
Istanbul Teknik Üniversitesi
Bilim, Sanayi ve Teknoloji Bakanliği

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