Pleistocene glacilacustrine sedimentation and lithofacies models in Southeast Wisconsin
Includes bibliographical references. Detailed deposystem analysis using lithofacies sequences, lithofacies associations and clast-fabric analyses have been conducted on Wisconsinan glacial and lacustrine successions exposed in coastal bluffs along Lake Michigan in southeast Wisconsin. Results indica...
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Northern Illinois University
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ftnorthillinuni:oai:commons.lib.niu.edu:10843/16142 2023-05-15T16:41:18+02:00 Pleistocene glacilacustrine sedimentation and lithofacies models in Southeast Wisconsin Jung, David J. Powell, Ross D. Department of Geology 1988 xiii, 336 pages application/pdf http://commons.lib.niu.edu/handle/10843/16142 eng eng Northern Illinois University http://commons.lib.niu.edu/handle/10843/16142 NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors. Sedimentation and deposition--Wisconsin Lithofacies--Wisconsin Geology Stratigraphic--Pleistocene Glaciers--Wisconsin Geology--Wisconsin Text Dissertation/Thesis 1988 ftnorthillinuni 2020-09-22T09:42:39Z Includes bibliographical references. Detailed deposystem analysis using lithofacies sequences, lithofacies associations and clast-fabric analyses have been conducted on Wisconsinan glacial and lacustrine successions exposed in coastal bluffs along Lake Michigan in southeast Wisconsin. Results indicate that the Laurentide Ice Sheet had a melting/freezing base where it terminated in a proglacial lake, as a tidewater front. Six different lithofacies types have been identified: (1) unstratified diamicton (sheet Dmu, lens Dmu); (2) stratified diamicton (Dms[r]); (3) interstratified silt and clay (Cld, Zld); (4) unstratified clay (Cud[r]); (5) stratified sand and gravel (G[sub s], S[sub s]); and (6) deformed silt and clay (Md). The oldest sequences preserve proglacial lake sediment of possible Glacial Lake Milwaukee origin. Glacial advance deformed and partially incorporated this sediment subglacially. The overlying subglacial till has previously been identified by others as the Wadsworth Till member of the Oak Creek Formation. Above the till are localized deposits of sediment gravity flows originating from a retreating grounding line. Next, ice-proximal lacustrine rythmites and deeper water muds were deposited along with iceberg-rafted debris. These deposits represent a large- scale glacial retreat previously identified as the Cary- Port Huron retreat. Glacial readvance deposited ice- proximal lacustrine silts and clays which were deformed a overlain by a second subglacial till. Large-scale faults and folds in sediments beneath tills, associated with plastically deformed silts and clays, and subglacial channel deposits indicate that the basal regime of the glacier was melting/freezing. Furthermore, dropstones and debris piles show that the glacier terminated as a grounded temperate glacier front which actively calved and produced icebergs. M.S. (Master of Science) Thesis Ice Sheet Tidewater Northern Illinois University (NIU): Huskie Commons Repository Glacial Lake ENVELOPE(-129.463,-129.463,58.259,58.259) |
institution |
Open Polar |
collection |
Northern Illinois University (NIU): Huskie Commons Repository |
op_collection_id |
ftnorthillinuni |
language |
English |
topic |
Sedimentation and deposition--Wisconsin Lithofacies--Wisconsin Geology Stratigraphic--Pleistocene Glaciers--Wisconsin Geology--Wisconsin |
spellingShingle |
Sedimentation and deposition--Wisconsin Lithofacies--Wisconsin Geology Stratigraphic--Pleistocene Glaciers--Wisconsin Geology--Wisconsin Jung, David J. Pleistocene glacilacustrine sedimentation and lithofacies models in Southeast Wisconsin |
topic_facet |
Sedimentation and deposition--Wisconsin Lithofacies--Wisconsin Geology Stratigraphic--Pleistocene Glaciers--Wisconsin Geology--Wisconsin |
description |
Includes bibliographical references. Detailed deposystem analysis using lithofacies sequences, lithofacies associations and clast-fabric analyses have been conducted on Wisconsinan glacial and lacustrine successions exposed in coastal bluffs along Lake Michigan in southeast Wisconsin. Results indicate that the Laurentide Ice Sheet had a melting/freezing base where it terminated in a proglacial lake, as a tidewater front. Six different lithofacies types have been identified: (1) unstratified diamicton (sheet Dmu, lens Dmu); (2) stratified diamicton (Dms[r]); (3) interstratified silt and clay (Cld, Zld); (4) unstratified clay (Cud[r]); (5) stratified sand and gravel (G[sub s], S[sub s]); and (6) deformed silt and clay (Md). The oldest sequences preserve proglacial lake sediment of possible Glacial Lake Milwaukee origin. Glacial advance deformed and partially incorporated this sediment subglacially. The overlying subglacial till has previously been identified by others as the Wadsworth Till member of the Oak Creek Formation. Above the till are localized deposits of sediment gravity flows originating from a retreating grounding line. Next, ice-proximal lacustrine rythmites and deeper water muds were deposited along with iceberg-rafted debris. These deposits represent a large- scale glacial retreat previously identified as the Cary- Port Huron retreat. Glacial readvance deposited ice- proximal lacustrine silts and clays which were deformed a overlain by a second subglacial till. Large-scale faults and folds in sediments beneath tills, associated with plastically deformed silts and clays, and subglacial channel deposits indicate that the basal regime of the glacier was melting/freezing. Furthermore, dropstones and debris piles show that the glacier terminated as a grounded temperate glacier front which actively calved and produced icebergs. M.S. (Master of Science) |
author2 |
Powell, Ross D. Department of Geology |
format |
Thesis |
author |
Jung, David J. |
author_facet |
Jung, David J. |
author_sort |
Jung, David J. |
title |
Pleistocene glacilacustrine sedimentation and lithofacies models in Southeast Wisconsin |
title_short |
Pleistocene glacilacustrine sedimentation and lithofacies models in Southeast Wisconsin |
title_full |
Pleistocene glacilacustrine sedimentation and lithofacies models in Southeast Wisconsin |
title_fullStr |
Pleistocene glacilacustrine sedimentation and lithofacies models in Southeast Wisconsin |
title_full_unstemmed |
Pleistocene glacilacustrine sedimentation and lithofacies models in Southeast Wisconsin |
title_sort |
pleistocene glacilacustrine sedimentation and lithofacies models in southeast wisconsin |
publisher |
Northern Illinois University |
publishDate |
1988 |
url |
http://commons.lib.niu.edu/handle/10843/16142 |
long_lat |
ENVELOPE(-129.463,-129.463,58.259,58.259) |
geographic |
Glacial Lake |
geographic_facet |
Glacial Lake |
genre |
Ice Sheet Tidewater |
genre_facet |
Ice Sheet Tidewater |
op_relation |
http://commons.lib.niu.edu/handle/10843/16142 |
op_rights |
NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors. |
_version_ |
1766031738223460352 |