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Statements

Subject Item
n2:RIV%2F00216208%3A11310%2F12%3A10128652%21RIV13-MSM-11310___
rdf:type
skos:Concept n18:Vysledek
rdfs:seeAlso
http://dx.doi.org/10.1007/s00531-011-0649-z
dcterms:description
A growing body of field evidence indicates that hypersolidus fabrics preserved in syntectonic plutons are likely to have formed in highly crystallized 'rigid sponge' magma. This paper demonstrates that such magma could be idealized as a rheological solid and that the development of non-coaxial fabrics in plutonic rocks can very conveniently be modeled in the framework of solid mechanics. Using the finite element method (FEM), we modeled two strain regimes of small magnitudes (plane-strain horizontal simple shear with the shear strain gamma of up to 0.30 and plane-strain pure shear of up to 15% shortening) superposed onto vertically oriented and variously spaced elastic phenocrysts set in the viscoelastic matrix. In the simple shear regime, the phenocrysts slightly rotate toward the shear plane, while the principal strain directions in the matrix are instantaneously oriented at an angle of about 45 degrees or less to the phenocryst fabric. Simple shear thus can only lead to the formation of oblique phenocryst and matrix fabrics. By contrast, the vertical phenocryst fabric is maintained in the pure shear regime, and a new horizontal fabric can develop almost instantaneously in the matrix even for small amounts of superposed shortening (5% shortening after 10 ky in our model). We conclude that such a mechanism can easily produce perpendicular hypersolidus fabrics in plutonic rocks and that only a very short time span (first thousands of years) is required to develop magmatic fabric in a pluton for 'normal' rates (10(-15) to 10(-13) s(-1)) of tectonic deformation. A growing body of field evidence indicates that hypersolidus fabrics preserved in syntectonic plutons are likely to have formed in highly crystallized 'rigid sponge' magma. This paper demonstrates that such magma could be idealized as a rheological solid and that the development of non-coaxial fabrics in plutonic rocks can very conveniently be modeled in the framework of solid mechanics. Using the finite element method (FEM), we modeled two strain regimes of small magnitudes (plane-strain horizontal simple shear with the shear strain gamma of up to 0.30 and plane-strain pure shear of up to 15% shortening) superposed onto vertically oriented and variously spaced elastic phenocrysts set in the viscoelastic matrix. In the simple shear regime, the phenocrysts slightly rotate toward the shear plane, while the principal strain directions in the matrix are instantaneously oriented at an angle of about 45 degrees or less to the phenocryst fabric. Simple shear thus can only lead to the formation of oblique phenocryst and matrix fabrics. By contrast, the vertical phenocryst fabric is maintained in the pure shear regime, and a new horizontal fabric can develop almost instantaneously in the matrix even for small amounts of superposed shortening (5% shortening after 10 ky in our model). We conclude that such a mechanism can easily produce perpendicular hypersolidus fabrics in plutonic rocks and that only a very short time span (first thousands of years) is required to develop magmatic fabric in a pluton for 'normal' rates (10(-15) to 10(-13) s(-1)) of tectonic deformation.
dcterms:title
A new approach to modeling perpendicular fabrics in porphyritic plutonic rocks using the finite element method A new approach to modeling perpendicular fabrics in porphyritic plutonic rocks using the finite element method
skos:prefLabel
A new approach to modeling perpendicular fabrics in porphyritic plutonic rocks using the finite element method A new approach to modeling perpendicular fabrics in porphyritic plutonic rocks using the finite element method
skos:notation
RIV/00216208:11310/12:10128652!RIV13-MSM-11310___
n18:predkladatel
n19:orjk%3A11310
n3:aktivita
n9:Z
n3:aktivity
Z(MSM0021620855), Z(MSM6840770003)
n3:cisloPeriodika
3
n3:dodaniDat
n6:2013
n3:domaciTvurceVysledku
n13:8387699
n3:druhVysledku
n11:J
n3:duvernostUdaju
n20:S
n3:entitaPredkladatele
n12:predkladatel
n3:idSjednocenehoVysledku
120346
n3:idVysledku
RIV/00216208:11310/12:10128652
n3:jazykVysledku
n15:eng
n3:klicovaSlova
Pluton; Perpendicular fabrics; Magmatic fabric; Granite; Finite element method (FEM); Anisotropy of magnetic susceptibility (AMS)
n3:klicoveSlovo
n4:Granite n4:Pluton n4:Finite%20element%20method%20%28FEM%29 n4:Perpendicular%20fabrics n4:Anisotropy%20of%20magnetic%20susceptibility%20%28AMS%29 n4:Magmatic%20fabric
n3:kodStatuVydavatele
DE - Spolková republika Německo
n3:kontrolniKodProRIV
[75B82D226E98]
n3:nazevZdroje
International Journal of Earth Sciences
n3:obor
n21:DB
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
2
n3:rokUplatneniVysledku
n6:2012
n3:svazekPeriodika
101
n3:tvurceVysledku
Žák, Jiří Kabele, Petr
n3:wos
000304186300011
n3:zamer
n16:MSM0021620855 n16:MSM6840770003
s:issn
1437-3254
s:numberOfPages
16
n8:doi
10.1007/s00531-011-0649-z
n10:organizacniJednotka
11310