Progressive Shock Metamorphism of Quartzite Ejecta from the Sedan Nuclear Explosion Crater

Short, Nicholas M.

doi:10.1086/627572

Cited by 55 publications

(31 citation statements)

References 20 publications

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“…These featu. ► .-;a tend to develop in feldspars over a lower pressure interval than that appropriate to quartz (Short, 1970c).…”

Section: Evidence For Shock Damage In the Lunar Samplesmentioning

confidence: 94%

“…Shock-Induced Lamellar Structures: Various workers have described certain types of shock-induced (dynamic) microdeformation that result in distinctive planer discontinuities in crystals differing from those produced by slower-loadtime (static) stresses (Bunch et al, 1968;Carter, 1965Carter, , 1968Engelhardt and Bertsch, 1968;Robertson et al, 1968;Short, 1970c). In tectosilicates, particularly, these shock lamellae or planer features tend to orient subparallel to one or more planes of certain crystallographic forms whose indices (e.g., {1013} , {22411) are not characteristic of deformation lamellae in tectonites.…”

Section: Evidence For Shock Damage In the Lunar Samplesmentioning

confidence: 99%

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The nature of the Moon's surface: evidence from shock metamorphism in Apollo 11 and 12 samples

Short

1970

Icarus

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“…These featu. ► .-;a tend to develop in feldspars over a lower pressure interval than that appropriate to quartz (Short, 1970c).…”

Section: Evidence For Shock Damage In the Lunar Samplesmentioning

confidence: 94%

Section: Evidence For Shock Damage In the Lunar Samplesmentioning

confidence: 99%

The nature of the Moon's surface: evidence from shock metamorphism in Apollo 11 and 12 samples

Short

1970

Icarus

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“…10e and 10f). Ballen quartz is characteristic for the devitrification of diaplectic quartz glass, which was shown to occur at temperatures >1100-1300 °C in annealing experiments (e.g., Short 1970;Stˆffler 1974b;RehfeldtOskierski et al 1986;Stˆffler and Langenhorst 1994;Grieve et al 1996). ZrSiO 4 that occurs in diaplectic quartz glass does not exhibit granular textures but consists of zircon and reidite intergrowths (Figs.…”

Section: Granular Textured Zirconmentioning

confidence: 99%

Shock‐metamorphosed zircon in terrestrial impact craters

Wittmann

Kenkmann

Schmitt

et al. 2006

Meteorit & Planetary Scien

156

201

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Shock-metamorphosed zircon in terrestrial impact cratersAbstract-To ascertain the progressive stages of shock metamorphism of zircon, samples from three well-studied impact craters were analyzed by optical microscopy, scanning electron microscopy (SEM), and Raman spectroscopy in thin section and grain separates. These samples are comprised of well-preserved, rapidly quenched impactites from the Ries crater, Germany, strongly annealed impactites from the Popigai crater, Siberia, and altered, variably quenched impactites from the Chicxulub crater, Mexico. The natural samples were compared with samples of experimentally shock-metamorphosed zircon. Below 20 GPa, zircon exhibits no distinct shock features. Above 20 GPa, optically resolvable planar microstructures occur together with the high-pressure polymorph reidite, which was only retained in the Ries samples. Decomposition of zircon to ZrO 2 only occurs in shock stage IV melt fragments that were rapidly quenched. This is not only a result of post-shock temperatures in excess of ∼1700 °C but could also be shock pressure-induced, which is indicated by possible relics of a high-pressure polymorph of ZrO 2 . However, ZrO 2 was found to revert to zircon with a granular texture during devitrification of impact melts. Other granular textures represent recrystallized amorphous ZrSiO 4 and reidite that reverted to zircon. This requires annealing temperatures >1100 °C. A systematic study of zircons from a continuous impactite sequence of the Chicxulub impact structure yields implications for the post-shock temperature history of suevite-like rocks until cooling below ∼600 °C.

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“…Plagio- [Traduit par le journal] clase was selected because it is known to exhibit shock metamorphic features ranging from deformation lamellae and mosaicism to diaplectic vitrification and glassy pseudomorphs (Bunch et al 1967;Milton and De Carli 1963;Dworak 1969;Dressler 1970;Short 1970; Stoffler 1972Stoffler , 1974Gibbons et al 1975). Charlevoix is an appropriate structure for such a study because plagioclase is common to most of the rock types exposed in the charnockite-anorthosite terrane and because such rocks can be sampled continuously from the moderately shocked central peak (-225 Kb, Robertson (1975)) outward to unshocked terrane.…”

Section: Introductionmentioning

confidence: 99%

Shock-produced mosaicism in plagioclase, Charlevoix structure, Quebec

Walawender¹

1977

Can. J. Earth Sci.

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The Charlevoix structure, Quebec, Canada, is generally accepted as a Paleozoic meteorite impact site. Plagioclase grains from samples in and around this structure were examined viaX-ray (oscillation) techniques to determine the maximum range of angular misorientation between crystal subdomains (mosaicism) within a given sample (qmax), and its usefulness as an index of shock metamorphism at Charlevoix. The complex morphological character of the impact crater can be divided into five concentric zones, which exhibit alternately high and low values of r), , , . This distribution appears to be the result of differential uplift and subsidence that followed the impact event, in that blocks which have undergone different shock histories during the impact event have been brought into juxtaposition. The wide range in r),,, within as well as between samples attests to the complex nature of the shock process and the hazards of using mosaicism as the sole index of shock metamorphism. La structure de Charlevoix, au Quebec, est generalement identifiee comme un site d'impact meteoritique datant du Paleozo'ique. Les grains de plagioclase provenant d'echantillons preleves B l'interieur et B la periphkrie de cette structure ont etC examines par techniques de rayons-X (oscillation) pour determiner l'amplitude maximum de la desorientation angulaire des sousdomaines cristallins (mosai'cisme) dans un Cchantillon donne ( r ) , , J , et pour Cvaluer son utilite comme indice du mttamorphisme de choc dans Charlevoix. On peut analyser le caractkre mqrphologique complexe du cratere d'impact en le divisant en cinq zones concentriques qui revklent alternativement des valeurs Olevees et faibles de r), , , .Cette distribution semble resulter de soulkvements et d'affaissements differentiels qui ont suivi l'impact avec pour consCquence que des blocs ayant subi des histoires de choc differentes durant l'impact ont Bte mis en juxtaposition. La variation assez grande de qmax B l'inttrieur d'un m&me Cchantillon aussi bien qu'entre les echantillons montre bien la nature complexe du processus de choc et le danger d'utiliser le mosai'cisme comme seul indice du metamorphisme de choc. IntroductionA shock wave passing through a heterogeneous rock mass undergoes numerous modifications as it interacts with grain boundaries, fractures, foliations, and different mineral species within the rock. The resultant shock front is not a perfectly smooth curvi-planar surface, but has local variations in shock pressure. Hence, each individual mineral grain experiences its own particular shock history based upon its physical properties and its relationship to both the adjacent grains and the overall structural character of the rock. A maximum shock effect in grains of a particular mineral species in a hand specimen may thus be a means of measuring relative deformation intensities throughout an impact structure.The purpose of this study was to examine the X-ray-sensitive structural properties of plagioclase from the Charlevoix impact site, and to determine if this mineral ...

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Progressive Shock Metamorphism of Quartzite Ejecta from the Sedan Nuclear Explosion Crater

Cited by 55 publications

References 20 publications

The nature of the Moon's surface: evidence from shock metamorphism in Apollo 11 and 12 samples

The nature of the Moon's surface: evidence from shock metamorphism in Apollo 11 and 12 samples

Shock‐metamorphosed zircon in terrestrial impact craters

Shock-produced mosaicism in plagioclase, Charlevoix structure, Quebec

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