Exploring the use of zircon geochronology as an indicator of Laurentide Ice Sheet till provenance, Indiana, USA
A pilot study was designed to evaluate the potential of zircon geochronology as a provenance indicator of till from the Lake Michigan, Saginaw, and Huron-Erie Lobes of the Laurentide Ice Sheet. Based on existing ice flow-path models, we hypothesized that till from each lobe would have different zirc...
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ftiupui:oai:scholarworks.iupui.edu:1805/18054 2023-10-09T21:52:23+02:00 Exploring the use of zircon geochronology as an indicator of Laurentide Ice Sheet till provenance, Indiana, USA Kassab, Christine M. Brickles, Samantha L. Licht, Kahty J. Managhan, G. William Earth Sciences, School of Science 2017 application/pdf https://hdl.handle.net/1805/18054 en eng Cambridge 10.1017/qua.2017.71 Quaternary Research Kassab, C. M., Brickles, S. L., Licht, K. J., & Monaghan, G. W. (2017). Exploring the use of zircon geochronology as an indicator of Laurentide Ice Sheet till provenance, Indiana, USA. Quaternary Research, 88(3), 525–536. https://doi.org/10.1017/qua.2017.71 https://hdl.handle.net/1805/18054 Publisher Policy Author U-Pb geochronology Laurentide ice sheet Article 2017 ftiupui 2023-09-22T14:25:05Z A pilot study was designed to evaluate the potential of zircon geochronology as a provenance indicator of till from the Lake Michigan, Saginaw, and Huron-Erie Lobes of the Laurentide Ice Sheet. Based on existing ice flow-path models, we hypothesized that till from each lobe would have different zircon age population distributions because the lobes originated from regions of the Canadian Shield with different bedrock ages. After correcting for zircon fertility, the majority of grains in all till samples are 1600–950 Ma, with ~30 % of ages >2500 Ma. This similarity means that till from the three lobes cannot be clearly differentiated based on their zircon populations. The dominant ages found and the homogeneity of distributions in the till indicates a non-Shield source and, instead, reflect an origin from some combination of underlying till and sedimentary bedrock in the Great Lakes region. Even though the datasets are small, the tills have similarities to zircon distributions in Michigan Basin rocks. This implies that a substantial fraction of zircon in till was not transported long distances from the Canadian Shield. Although zircon ages are not distinct between tills, the method provides a novel application to understand Laurentide Ice Sheet glacial erosion and transport. Article in Journal/Newspaper Ice Sheet Indiana University - Purdue University Indianapolis: IUPUI Scholar Works |
institution |
Open Polar |
collection |
Indiana University - Purdue University Indianapolis: IUPUI Scholar Works |
op_collection_id |
ftiupui |
language |
English |
topic |
U-Pb geochronology Laurentide ice sheet |
spellingShingle |
U-Pb geochronology Laurentide ice sheet Kassab, Christine M. Brickles, Samantha L. Licht, Kahty J. Managhan, G. William Exploring the use of zircon geochronology as an indicator of Laurentide Ice Sheet till provenance, Indiana, USA |
topic_facet |
U-Pb geochronology Laurentide ice sheet |
description |
A pilot study was designed to evaluate the potential of zircon geochronology as a provenance indicator of till from the Lake Michigan, Saginaw, and Huron-Erie Lobes of the Laurentide Ice Sheet. Based on existing ice flow-path models, we hypothesized that till from each lobe would have different zircon age population distributions because the lobes originated from regions of the Canadian Shield with different bedrock ages. After correcting for zircon fertility, the majority of grains in all till samples are 1600–950 Ma, with ~30 % of ages >2500 Ma. This similarity means that till from the three lobes cannot be clearly differentiated based on their zircon populations. The dominant ages found and the homogeneity of distributions in the till indicates a non-Shield source and, instead, reflect an origin from some combination of underlying till and sedimentary bedrock in the Great Lakes region. Even though the datasets are small, the tills have similarities to zircon distributions in Michigan Basin rocks. This implies that a substantial fraction of zircon in till was not transported long distances from the Canadian Shield. Although zircon ages are not distinct between tills, the method provides a novel application to understand Laurentide Ice Sheet glacial erosion and transport. |
author2 |
Earth Sciences, School of Science |
format |
Article in Journal/Newspaper |
author |
Kassab, Christine M. Brickles, Samantha L. Licht, Kahty J. Managhan, G. William |
author_facet |
Kassab, Christine M. Brickles, Samantha L. Licht, Kahty J. Managhan, G. William |
author_sort |
Kassab, Christine M. |
title |
Exploring the use of zircon geochronology as an indicator of Laurentide Ice Sheet till provenance, Indiana, USA |
title_short |
Exploring the use of zircon geochronology as an indicator of Laurentide Ice Sheet till provenance, Indiana, USA |
title_full |
Exploring the use of zircon geochronology as an indicator of Laurentide Ice Sheet till provenance, Indiana, USA |
title_fullStr |
Exploring the use of zircon geochronology as an indicator of Laurentide Ice Sheet till provenance, Indiana, USA |
title_full_unstemmed |
Exploring the use of zircon geochronology as an indicator of Laurentide Ice Sheet till provenance, Indiana, USA |
title_sort |
exploring the use of zircon geochronology as an indicator of laurentide ice sheet till provenance, indiana, usa |
publisher |
Cambridge |
publishDate |
2017 |
url |
https://hdl.handle.net/1805/18054 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Author |
op_relation |
10.1017/qua.2017.71 Quaternary Research Kassab, C. M., Brickles, S. L., Licht, K. J., & Monaghan, G. W. (2017). Exploring the use of zircon geochronology as an indicator of Laurentide Ice Sheet till provenance, Indiana, USA. Quaternary Research, 88(3), 525–536. https://doi.org/10.1017/qua.2017.71 https://hdl.handle.net/1805/18054 |
op_rights |
Publisher Policy |
_version_ |
1779315537714610176 |