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Palaeoglaciology of Bayan Har Shan, NE Tibetan Plateau: exposure ages reveal a missing LGM expansion

Heyman, Jakob; Stroeven, Arjen P.; Caffee, Marc W.; Hattestrand, Clas; Harbor, Jonathan M.; Li, Yingkui; Alexanderson, Helena LU ; Zhou, Liping and Hubbard, Alun (2011) In Quaternary Science Reviews 30(15-16). p.1988-2001
Abstract
The Bayan Har Shan, a prominent upland area in the northeastern sector of the Tibetan Plateau, hosts an extensive glacial geological record. To reconstruct its palaeoglaciology we have determined Be-10 exposure ages based on 67 samples from boulders, surface pebbles, and sediment sections in conjunction with studies of the glacial geology (remote sensing and field studies) and numerical glacier modelling. Exposure ages from moraines and glacial sediments in Bayan Har Shan range from 3 ka to 129 ka, with a large disparity in exposure ages for individual sites and within the recognised four morphostratigraphical groups. The exposure age disparity cannot be explained by differences in inheritance without using unrealistic assumptions but it... (More)
The Bayan Har Shan, a prominent upland area in the northeastern sector of the Tibetan Plateau, hosts an extensive glacial geological record. To reconstruct its palaeoglaciology we have determined Be-10 exposure ages based on 67 samples from boulders, surface pebbles, and sediment sections in conjunction with studies of the glacial geology (remote sensing and field studies) and numerical glacier modelling. Exposure ages from moraines and glacial sediments in Bayan Har Shan range from 3 ka to 129 ka, with a large disparity in exposure ages for individual sites and within the recognised four morphostratigraphical groups. The exposure age disparity cannot be explained by differences in inheritance without using unrealistic assumptions but it can be explained by differences in post-depositional shielding which produces exposure ages younger than the deglaciation age. We present a palaeoglaciological time-slice reconstruction in which the most restricted glaciation, with glaciers less than 10 km long, occurred before 40-65 ka. More extensive glaciations occurred before 60-100 ka and 95-165 ka. Maximum glaciation is poorly constrained but probably even older. The Bayan Hat Shan exposure age dataset indicates that glaciers on the northeastern Tibetan Plateau have remained surprisingly restricted for at least 40 ka, including the global last glacial maximum (LGM). This case of a missing LGM is further supported by high-resolution glacier modelling experiments. (C) 2011 Elsevier Ltd. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Tibetan plateau, Palaeoglaciology, Bayan Har, Exposure dating
in
Quaternary Science Reviews
volume
30
issue
15-16
pages
1988 - 2001
publisher
Elsevier
external identifiers
  • wos:000293436700016
  • scopus:79960078607
ISSN
0277-3791
DOI
10.1016/j.quascirev.2011.05.002
language
English
LU publication?
yes
id
6d4a9199-c9b3-4cf9-9804-3b3a66dfb305 (old id 2159090)
date added to LUP
2011-09-26 08:07:47
date last changed
2017-07-30 03:19:52
@article{6d4a9199-c9b3-4cf9-9804-3b3a66dfb305,
  abstract     = {The Bayan Har Shan, a prominent upland area in the northeastern sector of the Tibetan Plateau, hosts an extensive glacial geological record. To reconstruct its palaeoglaciology we have determined Be-10 exposure ages based on 67 samples from boulders, surface pebbles, and sediment sections in conjunction with studies of the glacial geology (remote sensing and field studies) and numerical glacier modelling. Exposure ages from moraines and glacial sediments in Bayan Har Shan range from 3 ka to 129 ka, with a large disparity in exposure ages for individual sites and within the recognised four morphostratigraphical groups. The exposure age disparity cannot be explained by differences in inheritance without using unrealistic assumptions but it can be explained by differences in post-depositional shielding which produces exposure ages younger than the deglaciation age. We present a palaeoglaciological time-slice reconstruction in which the most restricted glaciation, with glaciers less than 10 km long, occurred before 40-65 ka. More extensive glaciations occurred before 60-100 ka and 95-165 ka. Maximum glaciation is poorly constrained but probably even older. The Bayan Hat Shan exposure age dataset indicates that glaciers on the northeastern Tibetan Plateau have remained surprisingly restricted for at least 40 ka, including the global last glacial maximum (LGM). This case of a missing LGM is further supported by high-resolution glacier modelling experiments. (C) 2011 Elsevier Ltd. All rights reserved.},
  author       = {Heyman, Jakob and Stroeven, Arjen P. and Caffee, Marc W. and Hattestrand, Clas and Harbor, Jonathan M. and Li, Yingkui and Alexanderson, Helena and Zhou, Liping and Hubbard, Alun},
  issn         = {0277-3791},
  keyword      = {Tibetan plateau,Palaeoglaciology,Bayan Har,Exposure dating},
  language     = {eng},
  number       = {15-16},
  pages        = {1988--2001},
  publisher    = {Elsevier},
  series       = {Quaternary Science Reviews},
  title        = {Palaeoglaciology of Bayan Har Shan, NE Tibetan Plateau: exposure ages reveal a missing LGM expansion},
  url          = {http://dx.doi.org/10.1016/j.quascirev.2011.05.002},
  volume       = {30},
  year         = {2011},
}