Hydromechanical Impacts of Pleistocene Glaciations on Pore Fluid Pressure Evolution, Rock Failure, and Brine Migration Within Sedimentary Basins and the Crystalline Basement
The effects of Pleistocene glacial loading on rock failure, permeability increases, pore pressure evolution, and brine migration within two linked sedimentary basins were evaluated using a multiphysics control volume finite element model. We applied this model to an idealized cross section that exte...
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ftunivarizona:oai:repository.arizona.edu:10150/632242 2023-05-15T16:35:32+02:00 Hydromechanical Impacts of Pleistocene Glaciations on Pore Fluid Pressure Evolution, Rock Failure, and Brine Migration Within Sedimentary Basins and the Crystalline Basement Zhang, Yipeng Person, Mark Voller, Vaughan Cohen, Denis McIntosh, Jennifer Grapenthin, Ronni Univ Arizona, Dept Hydrol & Atmospher Sci 2018-10 http://hdl.handle.net/10150/632242 https://doi.org/10.1029/2017WR022464 en eng AMER GEOPHYSICAL UNION https://onlinelibrary.wiley.com/doi/abs/10.1029/2017WR022464 Zhang, Y., Person, M., Voller, V., Cohen, D., McIntosh, J., & Grapenthin, R. ( 2018). Hydromechanical impacts of Pleistocene glaciations on pore fluid pressure evolution, rock failure, and brine migration within sedimentary basins and the crystalline basement. Water Resources Research, 54, 7577– 7602. https://doi.org/10.1029/2017WR022464 0043-1397 1944-7973 doi:10.1029/2017WR022464 http://hdl.handle.net/10150/632242 WATER RESOURCES RESEARCH ©2018. American Geophysical Union. All Rights Reserved. Water Resources Research 54 10 7577 7602 Article 2018 ftunivarizona https://doi.org/10.1029/2017WR022464 2020-06-14T08:17:22Z The effects of Pleistocene glacial loading on rock failure, permeability increases, pore pressure evolution, and brine migration within two linked sedimentary basins were evaluated using a multiphysics control volume finite element model. We applied this model to an idealized cross section that extends across the continent of North America from the Hudson Bay to the Gulf of Mexico. Our analysis considered lithosphere geomechanical stress changes (sigma(yy) > 35 MPa) in response to 10 cycles of ice sheet loading. Hydrologic boundary conditions, lithosphere rheological properties, and aquifer/confining unit configuration were varied in a sensitivity study. We used a Coulomb Failure Stress change metric (Delta CFSp > 0.1 MPa) to increase permeability by a factor of 100 in some simulations. Results suggest that a buildup of anomalous pore pressures up to about 3 MPa occurred in confining units during periods of glaciations, but this had only a second-order effect on triggering rock failure. In regions prone to failure, permeability increases during glaciations help to explain observations of brine flushing in sedimentary basin aquifers. During the Holocene to present day, deglaciation resulted in underpressure formation in confining units primarily along the northern margin of the northern basin. Holocene-modern geomechanical stress fields were relatively small (<0.6 MPa). However, pore pressure increases associated with postglacial rebound, especially when a basal sedimentary basin aquifer is present, induced rock failure and seismicity up to 150 km beyond the terminus of the ice sheet. Sedimentary basin salinity patterns did not equilibrate after 10 simulated glacial cycles. NSF [EAR-1344553, EAR-0635685]; NSF (NSF EPSCoR) [IIA-130134] 6 month embargo; published online: 30 August 2018 This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu. Article in Journal/Newspaper Hudson Bay Ice Sheet The University of Arizona: UA Campus Repository Hudson Hudson Bay Water Resources Research 54 10 7577 7602 |
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Open Polar |
collection |
The University of Arizona: UA Campus Repository |
op_collection_id |
ftunivarizona |
language |
English |
description |
The effects of Pleistocene glacial loading on rock failure, permeability increases, pore pressure evolution, and brine migration within two linked sedimentary basins were evaluated using a multiphysics control volume finite element model. We applied this model to an idealized cross section that extends across the continent of North America from the Hudson Bay to the Gulf of Mexico. Our analysis considered lithosphere geomechanical stress changes (sigma(yy) > 35 MPa) in response to 10 cycles of ice sheet loading. Hydrologic boundary conditions, lithosphere rheological properties, and aquifer/confining unit configuration were varied in a sensitivity study. We used a Coulomb Failure Stress change metric (Delta CFSp > 0.1 MPa) to increase permeability by a factor of 100 in some simulations. Results suggest that a buildup of anomalous pore pressures up to about 3 MPa occurred in confining units during periods of glaciations, but this had only a second-order effect on triggering rock failure. In regions prone to failure, permeability increases during glaciations help to explain observations of brine flushing in sedimentary basin aquifers. During the Holocene to present day, deglaciation resulted in underpressure formation in confining units primarily along the northern margin of the northern basin. Holocene-modern geomechanical stress fields were relatively small (<0.6 MPa). However, pore pressure increases associated with postglacial rebound, especially when a basal sedimentary basin aquifer is present, induced rock failure and seismicity up to 150 km beyond the terminus of the ice sheet. Sedimentary basin salinity patterns did not equilibrate after 10 simulated glacial cycles. NSF [EAR-1344553, EAR-0635685]; NSF (NSF EPSCoR) [IIA-130134] 6 month embargo; published online: 30 August 2018 This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu. |
author2 |
Univ Arizona, Dept Hydrol & Atmospher Sci |
format |
Article in Journal/Newspaper |
author |
Zhang, Yipeng Person, Mark Voller, Vaughan Cohen, Denis McIntosh, Jennifer Grapenthin, Ronni |
spellingShingle |
Zhang, Yipeng Person, Mark Voller, Vaughan Cohen, Denis McIntosh, Jennifer Grapenthin, Ronni Hydromechanical Impacts of Pleistocene Glaciations on Pore Fluid Pressure Evolution, Rock Failure, and Brine Migration Within Sedimentary Basins and the Crystalline Basement |
author_facet |
Zhang, Yipeng Person, Mark Voller, Vaughan Cohen, Denis McIntosh, Jennifer Grapenthin, Ronni |
author_sort |
Zhang, Yipeng |
title |
Hydromechanical Impacts of Pleistocene Glaciations on Pore Fluid Pressure Evolution, Rock Failure, and Brine Migration Within Sedimentary Basins and the Crystalline Basement |
title_short |
Hydromechanical Impacts of Pleistocene Glaciations on Pore Fluid Pressure Evolution, Rock Failure, and Brine Migration Within Sedimentary Basins and the Crystalline Basement |
title_full |
Hydromechanical Impacts of Pleistocene Glaciations on Pore Fluid Pressure Evolution, Rock Failure, and Brine Migration Within Sedimentary Basins and the Crystalline Basement |
title_fullStr |
Hydromechanical Impacts of Pleistocene Glaciations on Pore Fluid Pressure Evolution, Rock Failure, and Brine Migration Within Sedimentary Basins and the Crystalline Basement |
title_full_unstemmed |
Hydromechanical Impacts of Pleistocene Glaciations on Pore Fluid Pressure Evolution, Rock Failure, and Brine Migration Within Sedimentary Basins and the Crystalline Basement |
title_sort |
hydromechanical impacts of pleistocene glaciations on pore fluid pressure evolution, rock failure, and brine migration within sedimentary basins and the crystalline basement |
publisher |
AMER GEOPHYSICAL UNION |
publishDate |
2018 |
url |
http://hdl.handle.net/10150/632242 https://doi.org/10.1029/2017WR022464 |
geographic |
Hudson Hudson Bay |
geographic_facet |
Hudson Hudson Bay |
genre |
Hudson Bay Ice Sheet |
genre_facet |
Hudson Bay Ice Sheet |
op_source |
Water Resources Research 54 10 7577 7602 |
op_relation |
https://onlinelibrary.wiley.com/doi/abs/10.1029/2017WR022464 Zhang, Y., Person, M., Voller, V., Cohen, D., McIntosh, J., & Grapenthin, R. ( 2018). Hydromechanical impacts of Pleistocene glaciations on pore fluid pressure evolution, rock failure, and brine migration within sedimentary basins and the crystalline basement. Water Resources Research, 54, 7577– 7602. https://doi.org/10.1029/2017WR022464 0043-1397 1944-7973 doi:10.1029/2017WR022464 http://hdl.handle.net/10150/632242 WATER RESOURCES RESEARCH |
op_rights |
©2018. American Geophysical Union. All Rights Reserved. |
op_doi |
https://doi.org/10.1029/2017WR022464 |
container_title |
Water Resources Research |
container_volume |
54 |
container_issue |
10 |
container_start_page |
7577 |
op_container_end_page |
7602 |
_version_ |
1766025774981185536 |