Three-Dimensional Geologic Model of Glacial Outwash in Mclean County, Illinois, Based on Seismic Refraction Studies
Seven two-dimensional (2-D) seismic refraction lines were used to determine the thickness and geometry of a valley train outwash deposit of the Quaternary Henry Formation near Heyworth in southern McLean County, Illinois. These refraction data were collected and processed in 2-D, then imported into...
Published in: | Geosciences |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
MDPI AG
2016
|
Subjects: | |
Online Access: | https://doi.org/10.3390/geosciences6010009 https://doaj.org/article/9336c0abe9f6401ca61e8867c29cba84 |
id |
ftdoajarticles:oai:doaj.org/article:9336c0abe9f6401ca61e8867c29cba84 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:9336c0abe9f6401ca61e8867c29cba84 2023-05-15T16:41:17+02:00 Three-Dimensional Geologic Model of Glacial Outwash in Mclean County, Illinois, Based on Seismic Refraction Studies Matthew Hartz David Malone Robert Nelson 2016-02-01T00:00:00Z https://doi.org/10.3390/geosciences6010009 https://doaj.org/article/9336c0abe9f6401ca61e8867c29cba84 EN eng MDPI AG http://www.mdpi.com/2076-3263/6/1/9 https://doaj.org/toc/2076-3263 2076-3263 doi:10.3390/geosciences6010009 https://doaj.org/article/9336c0abe9f6401ca61e8867c29cba84 Geosciences, Vol 6, Iss 1, p 9 (2016) seismic refraction Illinois Henry Formation valley train outwash 3D geologic model Geology QE1-996.5 article 2016 ftdoajarticles https://doi.org/10.3390/geosciences6010009 2022-12-31T03:58:51Z Seven two-dimensional (2-D) seismic refraction lines were used to determine the thickness and geometry of a valley train outwash deposit of the Quaternary Henry Formation near Heyworth in southern McLean County, Illinois. These refraction data were collected and processed in 2-D, then imported into a Petrel, a three-dimensional (3-D) geological modeling software package. The 3-D geologic model was built using the velocity attribute of the seismic refraction data. The 3-D velocity model was then verified manually by moving a cross-section through the velocity model at 20 m increments. These selected data points were used to create 3-D horizons, surfaces, and contacts constraining the target Henry Formation from the overlying alluvium of the Cahokia Formation and the underlying Delavan Till. Results of the 3-D model show the Henry Formation outwash trends about S10°E, which is oblique to S55°W-trending modern Kickapoo Creek valley. The Henry Formation outwash is confined to the Kickapoo valley, and consists of well-stratified sand and gravel at that is as much as 25 m in thickness in the channel. The thickness of the Henry Formation in the terrace is 8–10 m. The Cahokia Formation is everywhere about 2 m in thickness. The Henry Formation here is interpreted to be deposited in a subglacial tunnel valley that was deposited about 20,000 years ago as the Laurentide ice sheet retreated from its maximum southerly extent. Article in Journal/Newspaper Ice Sheet Directory of Open Access Journals: DOAJ Articles Geosciences 6 1 9 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
seismic refraction Illinois Henry Formation valley train outwash 3D geologic model Geology QE1-996.5 |
spellingShingle |
seismic refraction Illinois Henry Formation valley train outwash 3D geologic model Geology QE1-996.5 Matthew Hartz David Malone Robert Nelson Three-Dimensional Geologic Model of Glacial Outwash in Mclean County, Illinois, Based on Seismic Refraction Studies |
topic_facet |
seismic refraction Illinois Henry Formation valley train outwash 3D geologic model Geology QE1-996.5 |
description |
Seven two-dimensional (2-D) seismic refraction lines were used to determine the thickness and geometry of a valley train outwash deposit of the Quaternary Henry Formation near Heyworth in southern McLean County, Illinois. These refraction data were collected and processed in 2-D, then imported into a Petrel, a three-dimensional (3-D) geological modeling software package. The 3-D geologic model was built using the velocity attribute of the seismic refraction data. The 3-D velocity model was then verified manually by moving a cross-section through the velocity model at 20 m increments. These selected data points were used to create 3-D horizons, surfaces, and contacts constraining the target Henry Formation from the overlying alluvium of the Cahokia Formation and the underlying Delavan Till. Results of the 3-D model show the Henry Formation outwash trends about S10°E, which is oblique to S55°W-trending modern Kickapoo Creek valley. The Henry Formation outwash is confined to the Kickapoo valley, and consists of well-stratified sand and gravel at that is as much as 25 m in thickness in the channel. The thickness of the Henry Formation in the terrace is 8–10 m. The Cahokia Formation is everywhere about 2 m in thickness. The Henry Formation here is interpreted to be deposited in a subglacial tunnel valley that was deposited about 20,000 years ago as the Laurentide ice sheet retreated from its maximum southerly extent. |
format |
Article in Journal/Newspaper |
author |
Matthew Hartz David Malone Robert Nelson |
author_facet |
Matthew Hartz David Malone Robert Nelson |
author_sort |
Matthew Hartz |
title |
Three-Dimensional Geologic Model of Glacial Outwash in Mclean County, Illinois, Based on Seismic Refraction Studies |
title_short |
Three-Dimensional Geologic Model of Glacial Outwash in Mclean County, Illinois, Based on Seismic Refraction Studies |
title_full |
Three-Dimensional Geologic Model of Glacial Outwash in Mclean County, Illinois, Based on Seismic Refraction Studies |
title_fullStr |
Three-Dimensional Geologic Model of Glacial Outwash in Mclean County, Illinois, Based on Seismic Refraction Studies |
title_full_unstemmed |
Three-Dimensional Geologic Model of Glacial Outwash in Mclean County, Illinois, Based on Seismic Refraction Studies |
title_sort |
three-dimensional geologic model of glacial outwash in mclean county, illinois, based on seismic refraction studies |
publisher |
MDPI AG |
publishDate |
2016 |
url |
https://doi.org/10.3390/geosciences6010009 https://doaj.org/article/9336c0abe9f6401ca61e8867c29cba84 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Geosciences, Vol 6, Iss 1, p 9 (2016) |
op_relation |
http://www.mdpi.com/2076-3263/6/1/9 https://doaj.org/toc/2076-3263 2076-3263 doi:10.3390/geosciences6010009 https://doaj.org/article/9336c0abe9f6401ca61e8867c29cba84 |
op_doi |
https://doi.org/10.3390/geosciences6010009 |
container_title |
Geosciences |
container_volume |
6 |
container_issue |
1 |
container_start_page |
9 |
_version_ |
1766031712911884288 |