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Palaeoglaciology of...
Palaeoglaciology of Bayan Har Shan, NE Tibetan Plateau: the case of a missing LGM expansion
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- Heyman, Jakob, 1979- (författare)
- Stockholms universitet,Institutionen för naturgeografi och kvartärgeologi (INK)
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- Stroeven, Arjen P (författare)
- Stockholms universitet,Institutionen för naturgeografi och kvartärgeologi (INK)
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- Caffee, Marc W (författare)
- Department of Physics, Purdue Rare Isotope Measurement Laboratory, Purdue University
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- Hättestrand, Clas (författare)
- Stockholms universitet,Institutionen för naturgeografi och kvartärgeologi (INK)
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- Harbor, Jon (författare)
- Department of Earth and Atmospheric Sciences, Purdue University
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- Li, Yingkui (författare)
- Department of Geography, University of Tennessee, Knoxville
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- Alexanderson, Helena (författare)
- Stockholms universitet,Institutionen för naturgeografi och kvartärgeologi (INK)
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- Zhou, Liping (författare)
- Department of Geography, Peking University
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- Hubbard, Alun (författare)
- Institute of Geography and Earth Sciences, Aberystwyth University
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(creator_code:org_t)
- Engelska.
- Relaterad länk:
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https://urn.kb.se/re...
Abstract
Ämnesord
Stäng
- 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 10Be apparent 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. Apparent exposure ages from moraines and glacial sediments in Bayan Har Shan range from 3 ka to 129 ka, with a large disparity in ages for individual sites and within the recognised four morphostratigraphical groups. The age disparity is inexplicable as arising from differences in inheritance without the application of unrealistic assumptions but it can be explained as arising from differences in post-glacial shielding, yielding 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 Har 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 supported by high-resolution glacier modelling experiments.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Naturgeografi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Physical Geography (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)
Nyckelord
- Physical geography
- Naturgeografi
- Quaternary geology
- Kvartärgeologi
- Physical Geography
- naturgeografi
- kvartärgeologi
- Quarternary Geology
Publikations- och innehållstyp
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- Av författaren/redakt...
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Heyman, Jakob, 1 ...
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Stroeven, Arjen ...
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Caffee, Marc W
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Hättestrand, Cla ...
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Harbor, Jon
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Li, Yingkui
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visa fler...
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Alexanderson, He ...
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Zhou, Liping
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Hubbard, Alun
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visa färre...
- Om ämnet
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- NATURVETENSKAP
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NATURVETENSKAP
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och Geovetenskap och ...
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och Naturgeografi
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- NATURVETENSKAP
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NATURVETENSKAP
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och Geovetenskap och ...
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och Geologi
- Av lärosätet
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Stockholms universitet