Development of anisotropic contiguity in deforming partially molten aggregates : 2. Implications for the lithosphere‐asthenosphere boundary. / Hier-Majumder, Saswata; Drombosky, Tyler.

In: Journal of Geophysical Research: Solid Earth, Vol. 120, No. 2, 17.03.2015, p. 764–777.

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Development of anisotropic contiguity in deforming partially molten aggregates : 2. Implications for the lithosphere‐asthenosphere boundary. / Hier-Majumder, Saswata; Drombosky, Tyler.

In: Journal of Geophysical Research: Solid Earth, Vol. 120, No. 2, 17.03.2015, p. 764–777.

Research output: Contribution to journalArticle

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Hier-Majumder, Saswata ; Drombosky, Tyler. / Development of anisotropic contiguity in deforming partially molten aggregates : 2. Implications for the lithosphere‐asthenosphere boundary. In: Journal of Geophysical Research: Solid Earth. 2015 ; Vol. 120, No. 2. pp. 764–777.

BibTeX

@article{fd9cfe7ae061417ab08e5d4433af0e36,
title = "Development of anisotropic contiguity in deforming partially molten aggregates: 2. Implications for the lithosphere‐asthenosphere boundary",
abstract = "In this article, we calculate the seismic anisotropy resulting from melt redistribution during pure and simple shear deformation. Deformation strongly modifies the geometry of melts initially occupying three grain junctions. The initially isotropic fractional area of intergranular contact, contiguity, becomes anisotropic due to deformation. Consequently, the component of contiguity evaluated on the plane parallel to axis of maximum compressive stress decreases. During both modes of deformation, the trace of the contiguity tensor remains nearly unchanged. In the companion article [labeled DHM], we outline the numerical methods and present the synthetic micrographs from our numerical deformation experiments. In pure shear deformation, the principal contiguity directions remain stationary while they rotate during simple shear. The ratio between the principal components of the contiguity tensor decrease from 1 in an undeformed aggregate to 0.1 after 45% shortening in pure shear and to 0.3 after a shear strain of 0.75 in simple shear. In both pure and simple shear experiments, anisotropy in the shear wave velocity increases with the strain in a strongly nonlinear fashion. In pure shear deformation, the steady state microstructure produces nearly 3% anisotropy between shear waves vibrating perpendicular and parallel to the planes of melt films.",
author = "Saswata Hier-Majumder and Tyler Drombosky",
note = "This article is a companion to Drombosky and Hier-Majumder [2015] doi:10.1002/2014JB011068.",
year = "2015",
month = mar,
day = "17",
doi = "10.1002/2014JB011454",
language = "English",
volume = "120",
pages = "764–777",
journal = "Journal of Geophysical Research: Solid Earth",
issn = "2169-9313",
publisher = "Wiley-Blackwell",
number = "2",

}

RIS

TY - JOUR

T1 - Development of anisotropic contiguity in deforming partially molten aggregates

T2 - 2. Implications for the lithosphere‐asthenosphere boundary

AU - Hier-Majumder, Saswata

AU - Drombosky, Tyler

N1 - This article is a companion to Drombosky and Hier-Majumder [2015] doi:10.1002/2014JB011068.

PY - 2015/3/17

Y1 - 2015/3/17

N2 - In this article, we calculate the seismic anisotropy resulting from melt redistribution during pure and simple shear deformation. Deformation strongly modifies the geometry of melts initially occupying three grain junctions. The initially isotropic fractional area of intergranular contact, contiguity, becomes anisotropic due to deformation. Consequently, the component of contiguity evaluated on the plane parallel to axis of maximum compressive stress decreases. During both modes of deformation, the trace of the contiguity tensor remains nearly unchanged. In the companion article [labeled DHM], we outline the numerical methods and present the synthetic micrographs from our numerical deformation experiments. In pure shear deformation, the principal contiguity directions remain stationary while they rotate during simple shear. The ratio between the principal components of the contiguity tensor decrease from 1 in an undeformed aggregate to 0.1 after 45% shortening in pure shear and to 0.3 after a shear strain of 0.75 in simple shear. In both pure and simple shear experiments, anisotropy in the shear wave velocity increases with the strain in a strongly nonlinear fashion. In pure shear deformation, the steady state microstructure produces nearly 3% anisotropy between shear waves vibrating perpendicular and parallel to the planes of melt films.

AB - In this article, we calculate the seismic anisotropy resulting from melt redistribution during pure and simple shear deformation. Deformation strongly modifies the geometry of melts initially occupying three grain junctions. The initially isotropic fractional area of intergranular contact, contiguity, becomes anisotropic due to deformation. Consequently, the component of contiguity evaluated on the plane parallel to axis of maximum compressive stress decreases. During both modes of deformation, the trace of the contiguity tensor remains nearly unchanged. In the companion article [labeled DHM], we outline the numerical methods and present the synthetic micrographs from our numerical deformation experiments. In pure shear deformation, the principal contiguity directions remain stationary while they rotate during simple shear. The ratio between the principal components of the contiguity tensor decrease from 1 in an undeformed aggregate to 0.1 after 45% shortening in pure shear and to 0.3 after a shear strain of 0.75 in simple shear. In both pure and simple shear experiments, anisotropy in the shear wave velocity increases with the strain in a strongly nonlinear fashion. In pure shear deformation, the steady state microstructure produces nearly 3% anisotropy between shear waves vibrating perpendicular and parallel to the planes of melt films.

U2 - 10.1002/2014JB011454

DO - 10.1002/2014JB011454

M3 - Article

VL - 120

SP - 764

EP - 777

JO - Journal of Geophysical Research: Solid Earth

JF - Journal of Geophysical Research: Solid Earth

SN - 2169-9313

IS - 2

ER -