The Stampede tephra: a middle Pleistocene marker bed in glacial and eolian deposits of central Alaska
A deformed block of silt incorporated in a push moraine of the Lignite Creek drift of the Nenana River valley in central Alaska contains the 10 cm thick Stampede tephra. The silt block and tephra are folded, sheared, and cut by multiple fault planes and appear to have been entrained by a glacier and...
Published in: | Canadian Journal of Earth Sciences |
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Language: | English |
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Canadian Science Publishing
1991
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Online Access: | http://dx.doi.org/10.1139/e91-090 http://www.nrcresearchpress.com/doi/pdf/10.1139/e91-090 |
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crcansciencepubl:10.1139/e91-090 2023-12-17T10:17:50+01:00 The Stampede tephra: a middle Pleistocene marker bed in glacial and eolian deposits of central Alaska Begét, James E. Keskinen, Mary 1991 http://dx.doi.org/10.1139/e91-090 http://www.nrcresearchpress.com/doi/pdf/10.1139/e91-090 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 28, issue 7, page 991-1002 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1991 crcansciencepubl https://doi.org/10.1139/e91-090 2023-11-19T13:38:49Z A deformed block of silt incorporated in a push moraine of the Lignite Creek drift of the Nenana River valley in central Alaska contains the 10 cm thick Stampede tephra. The silt block and tephra are folded, sheared, and cut by multiple fault planes and appear to have been entrained by a glacier and deformed by glaciotectonic processes while frozen. The Stampede tephra is also found in a paleosol preserved within a sequence of eolian sediments near the Tanana River some 175 km to the northeast, allowing direct tephrochronologic correlations between the depositional record of Quaternary glaciations in the Alaska Range and eolian sediments in unglaciated central Alaska. The Lignite Creek drift predates deposits of the late Wisconsin Riley Creek and penultimate Healy glaciations but postdates the Stampede tephra, indicating that it dates to the middle Quaternary, and is not part of the Tertiary Nenana Gravel Formation. Article in Journal/Newspaper alaska range glacier Alaska Canadian Science Publishing (via Crossref) Riley ENVELOPE(-147.617,-147.617,-86.183,-86.183) Canadian Journal of Earth Sciences 28 7 991 1002 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
General Earth and Planetary Sciences |
spellingShingle |
General Earth and Planetary Sciences Begét, James E. Keskinen, Mary The Stampede tephra: a middle Pleistocene marker bed in glacial and eolian deposits of central Alaska |
topic_facet |
General Earth and Planetary Sciences |
description |
A deformed block of silt incorporated in a push moraine of the Lignite Creek drift of the Nenana River valley in central Alaska contains the 10 cm thick Stampede tephra. The silt block and tephra are folded, sheared, and cut by multiple fault planes and appear to have been entrained by a glacier and deformed by glaciotectonic processes while frozen. The Stampede tephra is also found in a paleosol preserved within a sequence of eolian sediments near the Tanana River some 175 km to the northeast, allowing direct tephrochronologic correlations between the depositional record of Quaternary glaciations in the Alaska Range and eolian sediments in unglaciated central Alaska. The Lignite Creek drift predates deposits of the late Wisconsin Riley Creek and penultimate Healy glaciations but postdates the Stampede tephra, indicating that it dates to the middle Quaternary, and is not part of the Tertiary Nenana Gravel Formation. |
format |
Article in Journal/Newspaper |
author |
Begét, James E. Keskinen, Mary |
author_facet |
Begét, James E. Keskinen, Mary |
author_sort |
Begét, James E. |
title |
The Stampede tephra: a middle Pleistocene marker bed in glacial and eolian deposits of central Alaska |
title_short |
The Stampede tephra: a middle Pleistocene marker bed in glacial and eolian deposits of central Alaska |
title_full |
The Stampede tephra: a middle Pleistocene marker bed in glacial and eolian deposits of central Alaska |
title_fullStr |
The Stampede tephra: a middle Pleistocene marker bed in glacial and eolian deposits of central Alaska |
title_full_unstemmed |
The Stampede tephra: a middle Pleistocene marker bed in glacial and eolian deposits of central Alaska |
title_sort |
stampede tephra: a middle pleistocene marker bed in glacial and eolian deposits of central alaska |
publisher |
Canadian Science Publishing |
publishDate |
1991 |
url |
http://dx.doi.org/10.1139/e91-090 http://www.nrcresearchpress.com/doi/pdf/10.1139/e91-090 |
long_lat |
ENVELOPE(-147.617,-147.617,-86.183,-86.183) |
geographic |
Riley |
geographic_facet |
Riley |
genre |
alaska range glacier Alaska |
genre_facet |
alaska range glacier Alaska |
op_source |
Canadian Journal of Earth Sciences volume 28, issue 7, page 991-1002 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e91-090 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
28 |
container_issue |
7 |
container_start_page |
991 |
op_container_end_page |
1002 |
_version_ |
1785523214804320256 |