A drift isopach model for the southwestern Great Slave Lake region, Northwest Territories, Canada
ABSTRACTThis study produced a drift thickness model for the southwestern Great Slave Lake area of northern Canada, using 12,692 lithostratigraphic records (seismic shothole drillers’ logs, diamond drill holes, petroleum wells), and field observations. Numerous algorithms and modelling parameters wer...
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2023
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Online Access: | https://doi.org/10.1080/17445647.2022.2147871 https://doaj.org/article/bac4f8669b804c60847c88b3ad6acf26 |
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ftdoajarticles:oai:doaj.org/article:bac4f8669b804c60847c88b3ad6acf26 2023-08-15T12:41:24+02:00 A drift isopach model for the southwestern Great Slave Lake region, Northwest Territories, Canada I. Rod Smith Christine Deblonde Grant Hagedorn Roger C. Paulen 2023-12-01T00:00:00Z https://doi.org/10.1080/17445647.2022.2147871 https://doaj.org/article/bac4f8669b804c60847c88b3ad6acf26 EN eng Taylor & Francis Group https://www.tandfonline.com/doi/10.1080/17445647.2022.2147871 https://doaj.org/toc/1744-5647 doi:10.1080/17445647.2022.2147871 1744-5647 https://doaj.org/article/bac4f8669b804c60847c88b3ad6acf26 Journal of Maps, Vol 19, Iss 1 (2023) Drift thickness glacial sediments isopach map empirical Bayesian kriging lithostratigraphy Northwest Territories Maps G3180-9980 article 2023 ftdoajarticles https://doi.org/10.1080/17445647.2022.2147871 2023-07-23T00:37:19Z ABSTRACTThis study produced a drift thickness model for the southwestern Great Slave Lake area of northern Canada, using 12,692 lithostratigraphic records (seismic shothole drillers’ logs, diamond drill holes, petroleum wells), and field observations. Numerous algorithms and modelling parameters were tested using 6122 records of absolute drift thickness, and based on a cross-validation analysis, an empirical Bayesian kriging K-Bessel detrended algorithm was found to produce the best fit. The final model, incorporating selected maximum and minimum thickness estimate data, produced a root mean square error of 4.98 m, with 94.8% of the data points within ±2 m of the modelled drift thicknesses. The model identifies widespread areas of drift >10 m thick, and prominent southeast-northwest aligned bedrock ramps. Karst structures buried by ≤73 m of drift were identified southwest of Great Slave Lake and appear to be aligned with regional fault systems like ore-associated karst at Pine Point. These may be the source of anomalous glacial sediment-derived base metal indicators collected proximally to the west. The most striking drift anomaly is in Cameron Hills where the eastern and northern margins are comprised of shale and siltstone bedrock overlain by 20–40 m of glacial sediments, but the central and western uplands have petroleum well logs identifying glacial sediments up to 400 m thick. In addition to mineral exploration, results of this study provide baseline data that can be used predictively by the petroleum industry in designing future seismic and drilling (casing depth) operations, and by those modelling groundwater sources and flow. Article in Journal/Newspaper Great Slave Lake Northwest Territories Directory of Open Access Journals: DOAJ Articles Cameron Hills ENVELOPE(-118.003,-118.003,59.800,59.800) Canada Great Slave Lake ENVELOPE(-114.001,-114.001,61.500,61.500) Northwest Territories Pine Point ENVELOPE(-114.449,-114.449,60.834,60.834) Journal of Maps 1 12 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Drift thickness glacial sediments isopach map empirical Bayesian kriging lithostratigraphy Northwest Territories Maps G3180-9980 |
spellingShingle |
Drift thickness glacial sediments isopach map empirical Bayesian kriging lithostratigraphy Northwest Territories Maps G3180-9980 I. Rod Smith Christine Deblonde Grant Hagedorn Roger C. Paulen A drift isopach model for the southwestern Great Slave Lake region, Northwest Territories, Canada |
topic_facet |
Drift thickness glacial sediments isopach map empirical Bayesian kriging lithostratigraphy Northwest Territories Maps G3180-9980 |
description |
ABSTRACTThis study produced a drift thickness model for the southwestern Great Slave Lake area of northern Canada, using 12,692 lithostratigraphic records (seismic shothole drillers’ logs, diamond drill holes, petroleum wells), and field observations. Numerous algorithms and modelling parameters were tested using 6122 records of absolute drift thickness, and based on a cross-validation analysis, an empirical Bayesian kriging K-Bessel detrended algorithm was found to produce the best fit. The final model, incorporating selected maximum and minimum thickness estimate data, produced a root mean square error of 4.98 m, with 94.8% of the data points within ±2 m of the modelled drift thicknesses. The model identifies widespread areas of drift >10 m thick, and prominent southeast-northwest aligned bedrock ramps. Karst structures buried by ≤73 m of drift were identified southwest of Great Slave Lake and appear to be aligned with regional fault systems like ore-associated karst at Pine Point. These may be the source of anomalous glacial sediment-derived base metal indicators collected proximally to the west. The most striking drift anomaly is in Cameron Hills where the eastern and northern margins are comprised of shale and siltstone bedrock overlain by 20–40 m of glacial sediments, but the central and western uplands have petroleum well logs identifying glacial sediments up to 400 m thick. In addition to mineral exploration, results of this study provide baseline data that can be used predictively by the petroleum industry in designing future seismic and drilling (casing depth) operations, and by those modelling groundwater sources and flow. |
format |
Article in Journal/Newspaper |
author |
I. Rod Smith Christine Deblonde Grant Hagedorn Roger C. Paulen |
author_facet |
I. Rod Smith Christine Deblonde Grant Hagedorn Roger C. Paulen |
author_sort |
I. Rod Smith |
title |
A drift isopach model for the southwestern Great Slave Lake region, Northwest Territories, Canada |
title_short |
A drift isopach model for the southwestern Great Slave Lake region, Northwest Territories, Canada |
title_full |
A drift isopach model for the southwestern Great Slave Lake region, Northwest Territories, Canada |
title_fullStr |
A drift isopach model for the southwestern Great Slave Lake region, Northwest Territories, Canada |
title_full_unstemmed |
A drift isopach model for the southwestern Great Slave Lake region, Northwest Territories, Canada |
title_sort |
drift isopach model for the southwestern great slave lake region, northwest territories, canada |
publisher |
Taylor & Francis Group |
publishDate |
2023 |
url |
https://doi.org/10.1080/17445647.2022.2147871 https://doaj.org/article/bac4f8669b804c60847c88b3ad6acf26 |
long_lat |
ENVELOPE(-118.003,-118.003,59.800,59.800) ENVELOPE(-114.001,-114.001,61.500,61.500) ENVELOPE(-114.449,-114.449,60.834,60.834) |
geographic |
Cameron Hills Canada Great Slave Lake Northwest Territories Pine Point |
geographic_facet |
Cameron Hills Canada Great Slave Lake Northwest Territories Pine Point |
genre |
Great Slave Lake Northwest Territories |
genre_facet |
Great Slave Lake Northwest Territories |
op_source |
Journal of Maps, Vol 19, Iss 1 (2023) |
op_relation |
https://www.tandfonline.com/doi/10.1080/17445647.2022.2147871 https://doaj.org/toc/1744-5647 doi:10.1080/17445647.2022.2147871 1744-5647 https://doaj.org/article/bac4f8669b804c60847c88b3ad6acf26 |
op_doi |
https://doi.org/10.1080/17445647.2022.2147871 |
container_title |
Journal of Maps |
container_start_page |
1 |
op_container_end_page |
12 |
_version_ |
1774294670472380416 |