Late Quaternary glaciation and equilibrium line altitude variations of the McKinley River region, central Alaska Range
Glacial deposits and landforms produced by the Muldrow and Peters glaciers in the McKinley River region of Alaska were examined using geomorphic and 10Be terrestrial cosmogenic nuclide (TCN) surface exposure dating (SED) methods to assess the timing and nature of late Quaternary glaciation and morai...
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ftpurdueuniv:oai:docs.lib.purdue.edu:physics_articles-3016 2023-07-02T03:29:29+02:00 Late Quaternary glaciation and equilibrium line altitude variations of the McKinley River region, central Alaska Range Dortch, J. M. Owen, L. A. Caffee, M. W. Brease, P. 2010-01-01T08:00:00Z https://docs.lib.purdue.edu/physics_articles/1229 http://onlinelibrary.wiley.com/doi/10.1111/j.1502-3885.2009.00121.x/full unknown Purdue University https://docs.lib.purdue.edu/physics_articles/1229 http://onlinelibrary.wiley.com/doi/10.1111/j.1502-3885.2009.00121.x/full Department of Physics and Astronomy Faculty Publications text 2010 ftpurdueuniv 2023-06-12T20:33:18Z Glacial deposits and landforms produced by the Muldrow and Peters glaciers in the McKinley River region of Alaska were examined using geomorphic and 10Be terrestrial cosmogenic nuclide (TCN) surface exposure dating (SED) methods to assess the timing and nature of late Quaternary glaciation and moraine stabilization. In addition to the oldest glacial deposits (McLeod Creek Drift), a group of four late Pleistocene moraines (MP-I, II, III and IV) and three late Holocene till deposits ('X', 'Y' and 'Z' drifts) are present in the region, representing at least eight glacial advances. The 10Be TCN ages for the MP-I moraine ranged from 2.5 kyr to 146 kyr, which highlights the problems of defining the ages of late Quaternary moraines using SED methods in central Alaska. The Muldrow 'X' drift has a 10Be TCN age of similar to 0.54 kyr, which is similar to 1.3 kyr younger than the independent minimum lichen age of similar to 1.8 kyr. This age difference probably represents the minimum time between formation and early stabilization of the moraine. Contemporary and former equilibrium line altitudes (ELAs) were determined. The ELA depressions for the Muldrow glacial system were 560, 400, 350 and 190 m and for the Peters glacial system 560, 360, 150 and 10 m, based on MP-I through MP-IV moraines, respectively. The difference between ELA depressions for the Muldrow and Peters glaciers likely reflects differences in supraglacial debris-cover, glacier hypsometry and topographic controls on glacier mass balance. Text alaska range glacier glaciers Alaska Purdue University: e-Pubs Ela ENVELOPE(9.642,9.642,63.170,63.170) McLeod ENVELOPE(-127.689,-127.689,55.254,55.254) McKinley River ENVELOPE(-102.385,-102.385,65.601,65.601) |
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Open Polar |
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Purdue University: e-Pubs |
op_collection_id |
ftpurdueuniv |
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description |
Glacial deposits and landforms produced by the Muldrow and Peters glaciers in the McKinley River region of Alaska were examined using geomorphic and 10Be terrestrial cosmogenic nuclide (TCN) surface exposure dating (SED) methods to assess the timing and nature of late Quaternary glaciation and moraine stabilization. In addition to the oldest glacial deposits (McLeod Creek Drift), a group of four late Pleistocene moraines (MP-I, II, III and IV) and three late Holocene till deposits ('X', 'Y' and 'Z' drifts) are present in the region, representing at least eight glacial advances. The 10Be TCN ages for the MP-I moraine ranged from 2.5 kyr to 146 kyr, which highlights the problems of defining the ages of late Quaternary moraines using SED methods in central Alaska. The Muldrow 'X' drift has a 10Be TCN age of similar to 0.54 kyr, which is similar to 1.3 kyr younger than the independent minimum lichen age of similar to 1.8 kyr. This age difference probably represents the minimum time between formation and early stabilization of the moraine. Contemporary and former equilibrium line altitudes (ELAs) were determined. The ELA depressions for the Muldrow glacial system were 560, 400, 350 and 190 m and for the Peters glacial system 560, 360, 150 and 10 m, based on MP-I through MP-IV moraines, respectively. The difference between ELA depressions for the Muldrow and Peters glaciers likely reflects differences in supraglacial debris-cover, glacier hypsometry and topographic controls on glacier mass balance. |
format |
Text |
author |
Dortch, J. M. Owen, L. A. Caffee, M. W. Brease, P. |
spellingShingle |
Dortch, J. M. Owen, L. A. Caffee, M. W. Brease, P. Late Quaternary glaciation and equilibrium line altitude variations of the McKinley River region, central Alaska Range |
author_facet |
Dortch, J. M. Owen, L. A. Caffee, M. W. Brease, P. |
author_sort |
Dortch, J. M. |
title |
Late Quaternary glaciation and equilibrium line altitude variations of the McKinley River region, central Alaska Range |
title_short |
Late Quaternary glaciation and equilibrium line altitude variations of the McKinley River region, central Alaska Range |
title_full |
Late Quaternary glaciation and equilibrium line altitude variations of the McKinley River region, central Alaska Range |
title_fullStr |
Late Quaternary glaciation and equilibrium line altitude variations of the McKinley River region, central Alaska Range |
title_full_unstemmed |
Late Quaternary glaciation and equilibrium line altitude variations of the McKinley River region, central Alaska Range |
title_sort |
late quaternary glaciation and equilibrium line altitude variations of the mckinley river region, central alaska range |
publisher |
Purdue University |
publishDate |
2010 |
url |
https://docs.lib.purdue.edu/physics_articles/1229 http://onlinelibrary.wiley.com/doi/10.1111/j.1502-3885.2009.00121.x/full |
long_lat |
ENVELOPE(9.642,9.642,63.170,63.170) ENVELOPE(-127.689,-127.689,55.254,55.254) ENVELOPE(-102.385,-102.385,65.601,65.601) |
geographic |
Ela McLeod McKinley River |
geographic_facet |
Ela McLeod McKinley River |
genre |
alaska range glacier glaciers Alaska |
genre_facet |
alaska range glacier glaciers Alaska |
op_source |
Department of Physics and Astronomy Faculty Publications |
op_relation |
https://docs.lib.purdue.edu/physics_articles/1229 http://onlinelibrary.wiley.com/doi/10.1111/j.1502-3885.2009.00121.x/full |
_version_ |
1770274643407536128 |