Non-scaled analogue modelling of AMS development during viscous flow: A simulation on diapir-like structures

Kratinová, Zuzana; Závada, Prokop; Hrouda, František; Schulmann, Karel

doi:10.1016/j.tecto.2005.12.013

Cited by 50 publications

(28 citation statements)

References 31 publications

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“…9), may correspond to a finite stretch component approximately parallel to the long axis of the pluton. The observed fabric characteristics in the Plechý and Haidmühler granites may represent a field example of ''fabric collapse'' predicted by recent analogue experiments on magnetic fabric development during viscous flow in ascending diapirs (Kratinová et al 2006) and characterized Büttner (2007). HG the Haidmühler granite, MG the Marginal granite, PG the Plechý granite, TG Třístoličník granite by reworking of steep fabric into horizontal, oblate fabric ellipsoids, and a low degree of anisotropy (Kratinová et al 2006).…”

Section: Discussionmentioning

confidence: 63%

Magmatic history and geophysical signature of a post-collisional intrusive center emplaced near a crustal-scale shear zone: the Plechý granite pluton (Moldanubian batholith, Bohemian Massif)

Verner

Žák

Pertoldová

et al. 2007

Int J Earth Sci (Geol Rundsch)

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The Plechý pluton, southwestern Bohemian Massif, represents a late-Variscan, complexly zoned intrusive center emplaced near the crustal-scale Pfahl shear zone; the pluton thus provides an opportunity to examine the interplay among successive emplacement of large magma batches, magmatic fabric acquisition, and the late-Variscan stress field associated with strike-slip shearing. The magmatic history of the pluton started with the emplacement of the porphyritic Plechý and Haidmühler granites. Based on gravity and structural data, we interpret that the Plechý and Haidmühler granites were emplaced as a deeply rooted, *NE-SW elongated body; its gross shape and internal fabric (steep *NE-SW magmatic foliation) may have been controlled by the late-Variscan stress field. The steep magmatic foliation changes into flat-lying foliation (particularly recorded by AMS) presumably as a result of divergent flow. Magnetic lineations correspond to a sub-horizontal *NE-SW finite stretch associated with the divergent flow. Subsequently, the Třístoličník granite, characterized by steep margin-parallel magmatic foliation, was emplaced as a crescent-shaped body in the central part of the pluton. The otherwise inward-younging intrusive sequence was completed by the emplacement of the outermost and the most evolved garnet-bearing granite (the Marginal granite) along the southeastern margin of the pluton.

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Section: Discussionmentioning

confidence: 63%

Magmatic history and geophysical signature of a post-collisional intrusive center emplaced near a crustal-scale shear zone: the Plechý granite pluton (Moldanubian batholith, Bohemian Massif)

Verner

Žák

Pertoldová

et al. 2007

Int J Earth Sci (Geol Rundsch)

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“…Note the fabric transposition related to acceleration of flow from the source to ascent chimney resulting in vertical prolate fabric and second major transposition related to deceleration flow from the chimney to the head of diapir related to development of sub-horizontal oblate fabric. Modified after Kratinová et al (2006) Gravity spreading of magma below roof pendants generates either constrictional fabrics or oblate sub-horizontal foliations due to vertical shortening superimposed on vertical fabrics of various intensities. Deviation of the original fabric from the vertical position critically influences the resulting fabric towards oblate and plane strain fields.…”

Section: Resultsmentioning

confidence: 99%

“…These experiments were recently carried out using a mixture of Paris plaster with fine-grained magnetite that was drilled and measured using the AMS technique after solidification (Kratinová et al 2006;Závada et al 2009). The former authors simulated simple diapiric process and showed how the vertical prolate fabrics in the ascent channel is progressively converted into flat oblate fabric at the upper part of the diapiric body via a neutral zone of sub-horizontal and extremely weak prolate fabrics (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Namely, in a vertically ascending magma, a planar (plane strain) fabric with different intensities may develop parallel to the vertical walls of a planar feeder. Due to the rigid top rock layer, the magma spreads and flows sub-horizontally as shown for example by Kratinová et al (2006). Therefore, during the final phase of magma emplacement, the primary steep planar fabric is overprinted by a horizontal flattening.…”

Section: Numerical Modeling Of Magnetic Fabricmentioning

confidence: 99%

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Some remarks on fabric overprints and constrictional AMS fabrics in igneous rocks

Schulmann

Ježek

2011

Int J Earth Sci (Geol Rundsch)

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International audienceDuring the ascent, emplacement and post-emplacement deformation of igneous rocks, two or more phases of deformation that overprint each other are often depicted. These overprints, when magnetic minerals are present, are recorded in magnetic fabric. In this contribution, overprints are studied by means of numerical modeling, following several basic scenarios common to igneous rocks. Biotite and amphibole that occur often together in igneous rocks are considered as carriers of the anisotropy of magnetic susceptibility. Modeling shows that (1) a constrictional fabric with a low degree of anisotropy as commonly recorded in magmatic rocks may result from a deformation overprint and not necessarily from an extensional/transtensional regime, and (2) that the constrictional AMS fabrics originates from orthogonal superimposition of a deformation event on an AMS fabric inherited from earlier magma emplacement history. Therefore, the interpretation of a constrictional fabric must be performed with caution. Numerical modeling may provide a suitable help in strengthening the interpretation of real magnetic fabric data

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“…In this paper, flow structures of magma intrusion are satisfactorily modelled using "Plaster of Paris" (Kratinová et al 2006). Through the addition of magnetic particles, the internal fabric patterns reflecting the flow and deformation are quantified by means of AMS.…”

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confidence: 99%

Fabric transpositions in granite plutons — An insight from non-scaled analogue modelling

2010

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Investigations on a set of experimental models of highly viscous intrusions were carried out in order to study the internal strain pattern during vertical ascent and emplacement of granite intrusions. The strain pattern was determined by means of anisotropy of magnetic susceptibility (AMS) resulting from the orientation of magnetite particles in a liquid plaster medium. The modelled intrusions show distinct fabrics reflecting the flow of a rheologically complex, nonNewtonian material. During the vertical growth of the intrusion, constrictional vertical fabrics are transposed into flattening fabrics, and along with the development of low-intensity fabric domains are passively transported upwards. Vertical growth takes place along subvertical thrust shear zones that satisfactorily explain the discordant magmatic fabrics in granites along intrusion sides. The resulting complex fabric patterns suggest that the vertical movement of material in ascending intrusions is accommodated by various flow mechanisms operating simultaneously.

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Non-scaled analogue modelling of AMS development during viscous flow: A simulation on diapir-like structures

Cited by 50 publications

References 31 publications

Magmatic history and geophysical signature of a post-collisional intrusive center emplaced near a crustal-scale shear zone: the Plechý granite pluton (Moldanubian batholith, Bohemian Massif)

Magmatic history and geophysical signature of a post-collisional intrusive center emplaced near a crustal-scale shear zone: the Plechý granite pluton (Moldanubian batholith, Bohemian Massif)

Some remarks on fabric overprints and constrictional AMS fabrics in igneous rocks

Fabric transpositions in granite plutons — An insight from non-scaled analogue modelling

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