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- W2350952110 abstract "The Heigou River originates on the southern slope of the Mount Bogda,the largest glaciated center in the eastern Tianshan Range. Ancient glaciers advanced and retreated dramatically during the glacial-interglacial cycles in Quaternary,the spectacular glacial depositional landforms were produced and well-preserved in the Heigou River valley,recording a complex history of Quaternary glacial cycles and landform evolution. These glacial landforms are a direct imprint of fluctuation of the ancient glaciers. Dating the glacial landform could determine the temporal and spatial variations of the ancient glaciers in this valley and also provide essential information for reconstructing the paleoenvironment in this region. Optically stimulated luminescence( OSL) dating technique was used to determine the ages of the fluvioglacial deposits( the sand lenses that sandwiched between tills in moraines) and glacial tills in this valley with single aliquot regenerative-dose( SAR) protocol. Based on the dating results,and considered the principle of geomorphology and stratigraphy,the data of palaeoclimate as well as the glacial histories in the other valleys of the Tianshan Range,the following conclusion could be drawn: five glacial advances occurred in the Heigou River valley,they are glacial advances of Little Ice Age( glacial advances in the cold periods since the 16thcentury) and Neoglaciation( glacial advances during the last 3- 4 ka) in Holocene,and other three glacial advances in the late and early period of last glaciation and penultimate glaciation,are equivalent in age to MIS 2,MIS 4 and MIS 6. In addition,the dating results of glacial tills and fluvioglacial deposits showthat the SAR protocol was appropriate for equivalent dose( De) determination of fluvioglacial deposits and that OSL did not work to date glacial tills in this study,because the signals in quartz grains in glacial tills was not completely bleached. The glacial landforms indicate that the ancient glaciers at their maximum extensions during the LIA,Neoglaciation and the last glaciation were 7. 6 km,11 km and 14 km long,respectively." @default.
- W2350952110 created "2016-06-24" @default.
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- W2350952110 date "2014-01-01" @default.
- W2350952110 modified "2023-09-24" @default.
- W2350952110 title "OSL dating of glacial deposits and glaciations in the Heigou River valley,eastern Tianshan Range,China" @default.
- W2350952110 hasPublicationYear "2014" @default.
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