Build-up and chronology of blue ice moraines in Queen Maud Land, Antarctica

Naki Akçar*, Serdar Yeşilyurt, Kristina Hippe, Marcus Christl, Christof Vockenhuber, Vural Yavuz, Burcu Özsoy

*Bu çalışma için yazışmadan sorumlu yazar

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

8 Atıf (Scopus)

Özet

Blue ice moraines are common supraglacial landforms in Antarctica and they are considered to record the ice volume fluctuations. In this study, we use photogrammetry and the analysis of multiple cosmogenic nuclides (10Be, 26Al, and in-situ 14C) in boulders on three blue ice moraines to explore the timing of ice volume fluctuations in the Sør Rondane Mountains, Queen Maud Land, and provide insights into the role of sediment sources in the reconstruction of their chronology. In the field, we observe that the blue ice moraines are composed of subglacially and supraglacially transported sediments. Cosmogenic 10Be and 26Al exposure ages of 14 surface samples, collected from boulders on three blue ice moraines, range from 15.4 ± 1.1 to 659.5 ± 33.9 ka. 26Al/10Be ratios vary between 3.53 ± 0.20 and 7.01 ± 0.32, and many of these ratios indicate complex exposure histories. In contrast, among nine in-situ 14C exposure ages, five vary between 4.2 ± 0.1 and 22.0 ± 1.3 ka, and four are saturated. We conclude that the accumulation of these blue ice moraines commenced before or during the global Last Glacial Maximum. Our results indicate that surficial sediment sources can yield exposure ages that are older than real exposure age, and exhibit a wider scatter. This can alter the reconstructed chronology of these landforms. The analysis of in-situ 14C has a high potential in tracking the pace of their evolution, especially since the Last Glacial Maximum.

Orijinal dilİngilizce
Makale numarası100012
DergiQuaternary Science Advances
Hacim2
DOI'lar
Yayın durumuYayınlandı - Eki 2020

Bibliyografik not

Publisher Copyright:
© 2020 The Authors

Finansman

We would like to thank Polar Research Center team at the Istanbul Technical University for organizing our participation in the BELARE 2017–2018 Expedition within the bilateral scientific collaboration program of the second Turkish Antarctic Expedition, TAE-II 2017–2018. We are grateful to thank Alain Hubert, Nighat Amin, and Michel de Wouters at the International Polar Foundation for their support both in the logistics and field. We would also like to thank the Princess Elisabeth Antarctica Research Station Team for their support during our field campaign. We are also grateful to the Laboratory of Ion Beam Physics accelerator mass spectrometry facility operated by the Swiss Federal Institute of Technology, Zurich, Switzerland. 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 Istanbul Technical University Polar Research Center (ITU PolRec) . It was financed by the ITU PolRec , Swiss National Science Foundation [grant number 200021–172475 ], Swiss Polar Institute , and University of Bern . We would like to thank Polar Research Center team at the Istanbul Technical University for organizing our participation in the BELARE 2017?2018 Expedition within the bilateral scientific collaboration program of the second Turkish Antarctic Expedition, TAE-II 2017?2018. We are grateful to thank Alain Hubert, Nighat Amin, and Michel de Wouters at the International Polar Foundation for their support both in the logistics and field. We would also like to thank the Princess Elisabeth Antarctica Research Station Team for their support during our field campaign. We are also grateful to the Laboratory of Ion Beam Physics accelerator mass spectrometry facility operated by the Swiss Federal Institute of Technology, Zurich, Switzerland. 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 Istanbul Technical University Polar Research Center (ITU PolRec). It was financed by the ITU PolRec, Swiss National Science Foundation [grant number 200021?172475], Swiss Polar Institute, and University of Bern.

FinansörlerFinansör numarası
Istanbul Technical University Polar Research Center
Michel de Wouters at the International Polar Foundation
Polar Research Center
Swiss Federal Institute of Technology, Zurich
University of Bern
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung200021–172475
Istanbul Teknik Üniversitesi
Bilim, Sanayi ve Teknoloji Bakanliği
Swiss Polar Institute

    Parmak izi

    Build-up and chronology of blue ice moraines in Queen Maud Land, Antarctica' araştırma başlıklarına git. Birlikte benzersiz bir parmak izi oluştururlar.

    Alıntı Yap