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Articles | Volume 9, issue 4
Articles | Volume 9, issue 4
https://doi.org/10.5194/se-9-847-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-9-847-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 9, issue 4
Research article
 | 
09 Jul 2018
Research article |  | 09 Jul 2018

Mechanical models to estimate the paleostress state from igneous intrusions

Tara L. Stephens, Richard J. Walker, David Healy, Alodie Bubeck, and Richard W. England

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Cited articles

Airoldi, G., Muirhead, J. D., White, J. D. L., and Rowland, J.: Emplacement of magma at shallow depth: insights from field relationships at Allan Hills, south Victoria Land, East Antarctica, Antarct. Sci., 23, 281–296, https://doi.org/10.1017/s0954102011000095, 2011.
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Brenner, S. L. and Gudmundsson, A: Arrest and aperture variation of hydrofractures in layered reservoirs, Geol. Soc. London Spec. Publ., 231, 117–128, 2004.
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We present mechanical models that use the attitude and opening angles of igneous sills to constrain stress axes, the stress ratio, and relative magma pressure during dilation. The models can be applied to any set of dilated structures, including dikes, sills, or veins. Comparison with paleostress analysis for coeval faults and deformation bands indicates that sills can be used to characterise the paleostress state in areas where other brittle deformation structures (e.g. faults) are not present.
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