Shock metamorphism of some rock-forming minerals

Feldman, V. I.; Сазонова, Л. В.; Milyavskii, V. V.; Бородина, Т. И.; Sokolov, S. N.; Жук, А. З.

doi:10.1134/s1069351306060048

Cited by 6 publications

(10 citation statements)

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“…We were the first the world around to synthesize high pressure high density mod ifications of Mg 2 SiO 4 and MgSiO 3 in laboratory experiments with rock loading by spherical converging shock waves during the diaplectic transformation of biotite and garnet Feldman et al, , 2005aFeldman et al, , 2005bFeldman et al, , 2006aFeldman et al, , 2006bFeldman et al, , 2007Sazonova et al, 2006). These experiments were carried out with samples of various rocks: staurolitegarnet-plagioclase-quartz-biotite schist from Kare lia, quartz-biotite-plagioclase-garnet schist from the Southern Urals, and biotite-garnet plagiogneiss from the Anabar Shield.…”

Section: Summary Of the Experimental Resultsmentioning

confidence: 99%

“…Their diaplectic transformations gradually increase, as is pronounced primarily in increasing degree of the migration of elements and increasing degree of distortions in crystal structures (Kozlov et al, , 1998aFeldman et al, 2000;Feldman et al, 2006aFeldman et al, , 2006bFeldman et al, , 2007.…”

Section: Materials Samples Parameters Of Their Shock Wave Loading mentioning

confidence: 96%

“…The very first STA are formed near the outer boundary of zone II as minute veinlets in weakened zones, which correspond to adiabatic shearing stripes (Feldman et al, 2006a(Feldman et al, , 2006b(Feldman et al, , 2007Sazonova et al, 2006), and the total volume of STA increases toward the center of the sphere (Fig. 4), so that STA eventu ally completely pseudomorphously replace the min eral.…”

Section: Materials Samples Parameters Of Their Shock Wave Loading mentioning

confidence: 98%

“…Because of the multiple reflections of the shock wave from grain boundaries with different impact impedance and because the distribution of the shock wave energy between phases is controlled by their vol umetric proportions in the rock (Kuropatenko, 2005;Feldman et al, 2006aFeldman et al, , 2006b, by no means all min eral grains in this zone become melted, and many grains, first of all, those near the outer boundary of the zone, are either not melted at all or are melted only partly. Their diaplectic transformations gradually increase, as is pronounced primarily in increasing degree of the migration of elements and increasing degree of distortions in crystal structures (Kozlov et al, , 1998aFeldman et al, 2000;Feldman et al, 2006aFeldman et al, , 2006bFeldman et al, , 2007.…”

Section: Materials Samples Parameters Of Their Shock Wave Loading mentioning

confidence: 99%

“…STA in garnet ( Fig. 7) consist of residual material, ringwoodite, hercynite, and a "pyroxene phase" (likely silicate perovskite) (Feldman et al, , 2006a(Feldman et al, , 2006b. The mineral was identified as ringwoodite with the application of Raman spectros copy (Labram spectrometer, Bavarian Geological Institute, Bayreuth, Germany) .…”

Section: Materials Samples Parameters Of Their Shock Wave Loading mentioning

confidence: 99%

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Rock transformations in spherically converging shock waves: Newly obtained experimental results

Козлов

Сазонова

2012

Petrology

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The paper presents a concise review of results obtained by studying shock metamorphism of polymineralic rocks with the application of spherical hermetically sealed recovery devices. Such experiments are proved to be able to reproduce principally important features of transformations detected in rocks from natural meteoritic craters (astroblemes). The experimental samples show subspherical concentric zones with different rock transformations, which are generally analogous to zones in natural astroblemes (listed in order from the centers of the spherical samples to their margins): fracturing, diaplectic transformations, selective and then complete melting, and finally, evaporation. However, the laboratory scale of the experiments and the absence of younger overprinted processes, which can obliterate impact transformations of rocks in nature, enable the researcher to reveal distinctive compositional, textural, and phase features of transformations induced in the rocks at increasing isentropic shock wave induced loading. Data on the mobility of major ele ments in the course of impact metamorphism show that the type and certain features of the crystal structures of minerals are of paramount importance for the amorphization of the minerals or their shock wave induced thermal decomposition. The crystal chemical control of mineral transformations was proved to be exerted at a number of levels. High pressure phases identified in experiments with shock wave loading were determined to crystallize from melt or via a phase transition associated with the migration of elements.

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Section: Summary Of the Experimental Resultsmentioning

confidence: 99%

Section: Materials Samples Parameters Of Their Shock Wave Loading mentioning

confidence: 96%

Section: Materials Samples Parameters Of Their Shock Wave Loading mentioning

confidence: 98%

Section: Materials Samples Parameters Of Their Shock Wave Loading mentioning

confidence: 99%

Section: Materials Samples Parameters Of Their Shock Wave Loading mentioning

confidence: 99%

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Rock transformations in spherically converging shock waves: Newly obtained experimental results

Козлов

Сазонова

2012

Petrology

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Shock experiments up to 30 GPa and their consequences on microstructures and magnetic properties in pyrrhotite

Mang

Kontny

Fritz

et al. 2013

Geochem Geophys Geosyst

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[1] Shock experiments with pressures ranging from 3 to 30GPa have been conducted on a mixed assemblage of hexagonal and monoclinic pyrrhotite. All samples were studied with respect to their particular shock-induced microstructures and magnetic properties at high and low temperatures. Up to 8GPa, microstructures in shocked pyrrhotite are characterized by mechanical deformation producing a damage of the crystal structure. At pressures of 20GPa and upward, amorphization and mechanical twinning are the dominant structural features induced by shock. Within the lower-pressure range coercivity, saturation isothermal remanent magnetization and coercivity of remanence increase with shock pressures, in agreement with more single-domain (SD)-like behavior. Simultaneously, the λ-peak of hexagonal pyrrhotite decreases and the 34K transition of monoclinic pyrrhotite broadens and is depressed. Magnetic hardening is triggered by grain-size reduction, but also by the formation of SD within discrete multidomain grains. Planar deformation features subdivide such multidomain grains into lath-shaped domains with average sizes lying in the SD range. The planar deformation features disappear at 20GPa and irregular, nanometer-sized "amorphous domains" occur instead. Pressure release from 30GPa finally triggers partial melting of pyrrhotite. The sharp interfaces between molten and crystalline pyrrhotite document a rapid change of thermal conditions. Within molten pyrrhotite, quenched iron crystals occur. The presence of native iron strongly influences the magnetic properties, depending on the particular amount in the studied sample and likely affects the magnetic properties of impact lithologies on Earth and extraterrestrial material.

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Shock Metamorphism of Hornblende and Plagioclase in Conditions of Step-Like Compression of Polymineral Rocks

Beljatinskaja¹,

Milyavskiy²,

Сазонова³

et al. 2008

AIP Conference Proceedings

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Shock metamorphism of some rock-forming minerals

Cited by 6 publications

References 4 publications

Rock transformations in spherically converging shock waves: Newly obtained experimental results

Rock transformations in spherically converging shock waves: Newly obtained experimental results

Shock experiments up to 30 GPa and their consequences on microstructures and magnetic properties in pyrrhotite

Shock Metamorphism of Hornblende and Plagioclase in Conditions of Step-Like Compression of Polymineral Rocks

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