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Cosmogenic 10Be and 26Al chronology of the last glaciation of the Palaeo-Daocheng ice cap, Southeastern Qinghai-Tibetan Plateau
|Authors:||Zhang Zhigang; Wang Jian; Xu Xiaobin; Bai Shibiao; Chang Zhiyang|
|Author Affiliations:||Primary: |
Nanjing Normal University, School of Geographical Sciences, Nanjing, China
Chinese Academy of Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, China
Jiangsu Second Normal University, China
Nanjing Institute of Tourism and Hospitality, China
|Volume Title:||Acta Geologica Sinica (English Edition)|
|Source:||Acta Geologica Sinica (English Edition), 89(2), p.575-584. Publisher: Wiley-Blackwell on behalf of the Geological Society of China, Beijing, China. ISSN: 1000-9515|
|Note:||In English. 63 refs.; illus., incl. 3 tables, geol. sketch maps|
|Summary:||The glacial landforms of the Qinghai-Tibetan Plateau(QTP) provide a unique opportunity to research hemispheric and global environmental changes. In this study, we focus on the glacial history of the palaeo-Daocheng Ice Cap(p-DIC) in the southeastern QTP during the last glacial cycle. Based on field investigations, morphostratigraphy, and surface exposure dating of roche moutonnee, polished surface and moraine debris through the terrestrial cosmogenic nuclides(TCN) 10 Be and 26 Al. We identify glacial deposits of the last deglaciation, with minimum ages of 14.9±1.3-18.7±1.7 ka, the Last Glacial Maximum(LGM) of 24.7±2.2 ka, and the early part of the last glacial period(marine oxygen isotope stage(MIS) 3) of 37.1±3.4?5.2±3.9 ka. Our results show that in this region, the extent of the glacial advance during MIS 3 was larger than that during the traditional LGM(MIS 2). These ages are consistent with prior chronologies, and the 10 Be age is consistent with the 26 Al age for the same sample. Thus, these data provide reliable constraints on climate change in the QTP, during the last glaciation.|
|Subjects:||Absolute age; Al-26; Alkaline earth metals; Aluminum; Be-10; Beryllium; Cenozoic; Cosmogenic elements; Dates; Geochronology; Glacial geology; Ice caps; Isotopes; Last glacial maximum; Late-glacial environment; Metals; Quaternary; Radioactive isotopes; Upper Quaternary; Asia; China; Far East; Sichuan China; Tibetan Plateau; Paleo-Daocheng ice cap|
|Coordinates:||N285458 N285458 E1000849 E1000849|
|Copyright Information:||GeoRef, Copyright 2021 American Geosciences Institute.|
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