Linking stress field deflection to basement structures in southern Ontario: Results from numerical modelling

Baird, A. F.; McKinnon, Stephen D.

doi:10.1016/j.tecto.2006.12.002

Cited by 4 publications

(2 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A linear elasticity is used for the layers and a Mohr-Coulomb behavior is used for sliding on faults. Various geological problems involving faults have been solved using this software [Dupin et al, 1993;Homberg et al, 1997;Sassi et al, 1997;Pascal, 2002;Homberg et al, 2004;Baird and McKinnon, 2007], and a detailed description of the numerical scheme is provided by Cundall [1988].…”

Section: Numerical Designmentioning

confidence: 99%

Fault nucleation, restriction, and aspect ratio in layered sections: Quantification of the strength and stiffness roles using numerical modeling

Roche

Homberg²,

Rocher

2013

JGR Solid Earth

View full text Add to dashboard Cite

[1] 3D numerical modeling has been used to investigate how the variations of mechanical properties in sedimentary layered sections affect the development of normal faults. We calculated the distribution of the Coulomb stress to assess the proximity of the layers to failure through an elastic layered section. The simulation of various combinations of rock properties allowed us to compare the effect of the stiffness and strength contrasts, which promote or inhibit faulting in the stiff layer, respectively. For rock systems showing little variation in strength, nucleation of the fault occurs in the stiff layer (e.g., limestones or sandstones), whereas it occurs in the compliant layer (e.g., clay-rich rocks) if the stiff layer has a high cohesion. Considering a mean strength profile of the carbonate sequences, nucleation occurs in limestones if the ratio of Young's moduli between the limestone and clay-rich rock is greater than 2; otherwise, clay-rich layers fail first. We also showed that nucleation is promoted in sandstones or limestones if these layers are thinner than the clayey layers. In a second set of simulation, using a slip on a fault, we examined the conditions needed to overcome the restriction of the fault propagation. Our results suggest that the lateral propagation of the fault, within a layer, produces increasingly favorable conditions for vertical propagation. A maximum aspect ratio of width to height of 13 is predicted for faults in limestone-clay sequences, and this maximum aspect ratio is expected to decrease as the contrast in the rock properties decreases.Citation: Roche, V., C. Homberg, and M. Rocher (2013), Fault nucleation, restriction, and aspect ratio in layered sections: Quantification of the strength and stiffness roles using numerical modeling,

show abstract

Section: Numerical Designmentioning

confidence: 99%

Fault nucleation, restriction, and aspect ratio in layered sections: Quantification of the strength and stiffness roles using numerical modeling

Roche

Homberg²,

Rocher

2013

JGR Solid Earth

View full text Add to dashboard Cite

show abstract

“…Burberry, Swiatlowski, Searls, & Filina, 2018), and are compatible with the current stress field with an extensional mode of opening (Figure 6; Engelder, 1982; Heidbach, Rajabi, Reiter, & Ziegler, 2016). Joint orientation deviation from this dominate trend may be the result of basement structures that locally deflect the stress field (Baird & McKinnon, 2007). In the St. Lawrence Platform, calcite was collected from the ENE‐WSW trending joints and regardless of minor variability, all calcite veins analysed in this study are isotopically analogous to the bulk composition of the Middle Ordovician limestone host rock.…”

Section: Discussionmentioning

confidence: 99%

Geochronology of calcite‐filled joints, southeast Canada: Insight into Late Cretaceous deformation of eastern North America

2020

View full text Add to dashboard Cite

Resolving the timing of brittle tectonism is a challenge. We examined intra‐cratonic Middle Ordovician limestone bedrock that overlies Mesoproterozoic crystalline basement, which are both cut by ENE‐WSW trending fault zones that have historic M4‐5 earthquakes along their trace. Calcite‐filled mode I joints are ubiquitous within the strata, and are parallel to the modern stress field. Calcite δ18O and δ13C values are analogous to the bulk composition of Middle Ordovician limestones, and suggest vein formation from a source dominated by connate fluids of the host rock. U‐Pb geochronology of six calcite veins sealing ENE‐WSW oriented joints produced similar Cretaceous dates and were regressed together yielding a date of 96.8 ± 1.1 Ma (MSWD: 2.9). A Cenomanian age is consistent with the most recent reorientation of North America's compressive stress field, which is attributed to a change in spreading direction along the northern Mid‐Atlantic Ridge and is linked to a global plate reorganization event at ca. 105–100 Ma. These results suggest that the most recent redistribution of lateral stress was not a passive event, and generated brittle deformation and fluid flow at least 500 km inland of North America's Atlantic passive margin.

show abstract

Geologic controls on hydraulic conductivity in a karst-influenced carbonate bedrock groundwater system in southern Ontario, Canada

et al. 2018

View full text Add to dashboard Cite

Linking stress field deflection to basement structures in southern Ontario: Results from numerical modelling

Cited by 4 publications

References 44 publications

Fault nucleation, restriction, and aspect ratio in layered sections: Quantification of the strength and stiffness roles using numerical modeling

Fault nucleation, restriction, and aspect ratio in layered sections: Quantification of the strength and stiffness roles using numerical modeling

Geochronology of calcite‐filled joints, southeast Canada: Insight into Late Cretaceous deformation of eastern North America

Geologic controls on hydraulic conductivity in a karst-influenced carbonate bedrock groundwater system in southern Ontario, Canada

Contact Info

Product

Resources

About