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dc.contributor.authorZhang, Yipeng
dc.contributor.authorPerson, Mark
dc.contributor.authorVoller, Vaughan
dc.contributor.authorCohen, Denis
dc.contributor.authorMcIntosh, Jennifer
dc.contributor.authorGrapenthin, Ronni
dc.date.accessioned2019-05-13T19:38:15Z
dc.date.available2019-05-13T19:38:15Z
dc.date.issued2018-10
dc.identifier.citationZhang, 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/10.1029/2017WR022464en_US
dc.identifier.issn0043-1397
dc.identifier.issn1944-7973
dc.identifier.doi10.1029/2017WR022464
dc.identifier.urihttp://hdl.handle.net/10150/632242
dc.description.abstractThe 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.en_US
dc.description.sponsorshipNSF [EAR-1344553, EAR-0635685]; NSF (NSF EPSCoR) [IIA-130134]en_US
dc.language.isoenen_US
dc.publisherAMER GEOPHYSICAL UNIONen_US
dc.relation.urlhttps://onlinelibrary.wiley.com/doi/abs/10.1029/2017WR022464en_US
dc.rights©2018. American Geophysical Union. All Rights Reserved.en_US
dc.titleHydromechanical Impacts of Pleistocene Glaciations on Pore Fluid Pressure Evolution, Rock Failure, and Brine Migration Within Sedimentary Basins and the Crystalline Basementen_US
dc.typeArticleen_US
dc.contributor.departmentUniv Arizona, Dept Hydrol & Atmospher Scien_US
dc.identifier.journalWATER RESOURCES RESEARCHen_US
dc.description.note6 month embargo; published online: 30 August 2018en_US
dc.description.collectioninformationThis 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.en_US
dc.eprint.versionFinal published versionen_US
dc.source.journaltitleWater Resources Research
dc.source.volume54
dc.source.issue10
dc.source.beginpage7577
dc.source.endpage7602
refterms.dateFOA2019-03-02T00:00:00Z


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