Little Ice Age Glacial Geomorphology and Sedimentology of Portage Glacier, South-Central Alaska.
The study of glacial landforms and deposits is important, as it is difficult to observe processes under modern glaciers and ice-sheets. Thus landscapes and sediments that are the product of present glaciation can give insight into processes that occurred during Pleistocene times. This study investig...
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ftsanjosestate:oai:scholarworks.sjsu.edu:geol_pub-1010 2023-07-30T04:03:35+02:00 Little Ice Age Glacial Geomorphology and Sedimentology of Portage Glacier, South-Central Alaska. Santos, João Cordova, Carlos 2009-01-01T08:00:00Z https://scholarworks.sjsu.edu/geol_pub/11 https://doi.org/10.18055/Finis1380 http://works.bepress.com/joao-santos/6/download/ unknown SJSU ScholarWorks https://scholarworks.sjsu.edu/geol_pub/11 doi:10.18055/Finis1380 http://works.bepress.com/joao-santos/6/download/ http://creativecommons.org/licenses/by-nc-nd/4.0/ Faculty Publications Glacial geomorphology Portage Glacier South-Central Alaska Geography text 2009 ftsanjosestate https://doi.org/10.18055/Finis1380 2023-07-17T19:02:03Z The study of glacial landforms and deposits is important, as it is difficult to observe processes under modern glaciers and ice-sheets. Thus landscapes and sediments that are the product of present glaciation can give insight into processes that occurred during Pleistocene times. This study investigates the genesis of little ice age glacial landforms present in Portage Glacier, South-Central Alaska. The present day moraine morphology and sedimentology in Portage Glacier valley reveals the presence of two types of till and moraines. The clast-rich sandy diamicton present on the 1852 moraine is interpreted to be a basal till indicating this feature is a push moraine representing an advance or a standstill position of Portage Glacier in 1852. The moderately sorted gray sandy boulder gravel present on the 1900 and 1922 moraines is interpreted to be an ice-marginal deposit (ablation till) with a mixture of supraglacial and glaciofluvial sediments deposited by slumping and stream sorting processes. All of these features are interpreted to be ablation moraines representing glacier retreat and moraine building in 1900 and1922 Text glacier glaciers Alaska San José State University: SJSU ScholarWorks Finisterra 44 87 |
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Open Polar |
collection |
San José State University: SJSU ScholarWorks |
op_collection_id |
ftsanjosestate |
language |
unknown |
topic |
Glacial geomorphology Portage Glacier South-Central Alaska Geography |
spellingShingle |
Glacial geomorphology Portage Glacier South-Central Alaska Geography Santos, João Cordova, Carlos Little Ice Age Glacial Geomorphology and Sedimentology of Portage Glacier, South-Central Alaska. |
topic_facet |
Glacial geomorphology Portage Glacier South-Central Alaska Geography |
description |
The study of glacial landforms and deposits is important, as it is difficult to observe processes under modern glaciers and ice-sheets. Thus landscapes and sediments that are the product of present glaciation can give insight into processes that occurred during Pleistocene times. This study investigates the genesis of little ice age glacial landforms present in Portage Glacier, South-Central Alaska. The present day moraine morphology and sedimentology in Portage Glacier valley reveals the presence of two types of till and moraines. The clast-rich sandy diamicton present on the 1852 moraine is interpreted to be a basal till indicating this feature is a push moraine representing an advance or a standstill position of Portage Glacier in 1852. The moderately sorted gray sandy boulder gravel present on the 1900 and 1922 moraines is interpreted to be an ice-marginal deposit (ablation till) with a mixture of supraglacial and glaciofluvial sediments deposited by slumping and stream sorting processes. All of these features are interpreted to be ablation moraines representing glacier retreat and moraine building in 1900 and1922 |
format |
Text |
author |
Santos, João Cordova, Carlos |
author_facet |
Santos, João Cordova, Carlos |
author_sort |
Santos, João |
title |
Little Ice Age Glacial Geomorphology and Sedimentology of Portage Glacier, South-Central Alaska. |
title_short |
Little Ice Age Glacial Geomorphology and Sedimentology of Portage Glacier, South-Central Alaska. |
title_full |
Little Ice Age Glacial Geomorphology and Sedimentology of Portage Glacier, South-Central Alaska. |
title_fullStr |
Little Ice Age Glacial Geomorphology and Sedimentology of Portage Glacier, South-Central Alaska. |
title_full_unstemmed |
Little Ice Age Glacial Geomorphology and Sedimentology of Portage Glacier, South-Central Alaska. |
title_sort |
little ice age glacial geomorphology and sedimentology of portage glacier, south-central alaska. |
publisher |
SJSU ScholarWorks |
publishDate |
2009 |
url |
https://scholarworks.sjsu.edu/geol_pub/11 https://doi.org/10.18055/Finis1380 http://works.bepress.com/joao-santos/6/download/ |
genre |
glacier glaciers Alaska |
genre_facet |
glacier glaciers Alaska |
op_source |
Faculty Publications |
op_relation |
https://scholarworks.sjsu.edu/geol_pub/11 doi:10.18055/Finis1380 http://works.bepress.com/joao-santos/6/download/ |
op_rights |
http://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_doi |
https://doi.org/10.18055/Finis1380 |
container_title |
Finisterra |
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44 |
container_issue |
87 |
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1772814619511881728 |