Experimental Techniques for the Simulation of Shock Metamorphism: A Case Study on Calcite

Langenhorst, F.; Boustie, M.; Deutsch, A.; Hornemann, U.; Matignon, Ch.; Migault, A.; Romain, J. P.

doi:10.1007/978-1-4613-0011-3_1

Cited by 23 publications

(43 citation statements)

References 31 publications

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“…Ferrière et al 2007a). Regarding the shock pressure necessary to yield the features observed in calcite, only a qualitative assessment (e.g., Langenhorst and Deutsch 1998) and some experimental data are available (Langenhorst et al 2002). A systematic classification of shock metamorphic features in carbonate minerals, especially in calcareous (meta-)graywackes, is lacking so far.…”

Section: Shock Metamorphismmentioning

confidence: 99%

The ICDP Lake Bosumtwi impact crater scientific drilling project (Ghana): Core LB‐08A litho‐log, related ejecta, and shock recovery experiments

Deutsch

Luetke

Heinrich

2007

Meteorit & Planetary Scien

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Abstract-The 1.07 Myr old Lake Bosumtwi impact crater in Ghana was drilled within the framework of the International Continental Scientific Drilling Project (ICDP). Hole LB-08A, drilled into the outer flank of the central uplift and with a total depth of 451 m, yielded 215.71 m of impact-related rocks. This paper summarizes observations of the lithological logging on core LB-08A. Between a depth of 235.6 and ~260 m, the section consists of a melt-bearing allochthonous, polymict, and mostly clast-supported impact breccia. Down to ~418 m, the section comprises a rather uniform unit of metagraywacke alternating with phyllite to slate (lower greenschist facies); few (par-) autochthonous impact breccia bodies and rare impact dike breccias are present. The lowermost part of the section contains several centimeter-to decimeter-thick melt-bearing breccia dikes in country rocks identical to those occurring above. Omnipresent fracturing was mapped in a qualitative manner. Most prominent shock effects in the uplifted target rocks comprise planar fractures and deformation elements in quartz and polysynthetic twinning in carbonate minerals; the maximum shock pressure as evidenced by quartz is below 26 GPa. The allochthonous breccias occasionally contain a few vol% of melt particles. Suevites occur outside the crater rim, carrying diaplectic crystals, coesite, and ballen quartz as well as true melt glasses and a variety of lithic clasts, among those spectacular staurolite-rich mica-schists. The recorded shock level in the uplifted target rocks is lower than expected and modeled. Shock recovery experiments with analogue carbonaceous graywackes at 34 and 39.5 GPa yielded nearly complete transformation of quartz into diaplectic glass. We therefore exclude a specific shock behavior of the soft, fluid-rich target material (carbonaceous graywackes, shales, slates) in core LB-08A as the prime or only reason for the melt deficit and the generally low shock levels recorded inside the Lake Bosumtwi impact crater.

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Section: Shock Metamorphismmentioning

confidence: 99%

The ICDP Lake Bosumtwi impact crater scientific drilling project (Ghana): Core LB‐08A litho‐log, related ejecta, and shock recovery experiments

Deutsch

Luetke

Heinrich

2007

Meteorit & Planetary Scien

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“…In this context, observations on K-Pg ejecta sites may provide boundary conditions for improving numerical models of the vapor plume (Agrinier et al, 2001;Langenhorst et al, 2002). Experiments show that degassed carbonates (i.e., the residual CaO) display a porous texture with very high surface area, causing fast back-reaction with CO 2 to reform calcite (Agrinier et al, 2001).…”

Section: Introductionmentioning

confidence: 96%

A dual-layer Chicxulub ejecta sequence with shocked carbonates from the Cretaceous–Paleogene (K–Pg) boundary, Demerara Rise, western Atlantic

Schulte

Deutsch

Salge

et al. 2009

Geochimica et Cosmochimica Acta

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“…The experimental and regional tectonic studies indicate a correlation between the amount of deformation and the amount of strain over a geologic time scale, but analysis of shock-induced deformation in calcite crystals from impact craters is limited. Recently, analysis using transmission electron microscopy (TEM) of experimentally shocked samples indicates that dislocations and mechanical twinning occur in calcite crystals as a result of shock (Ivanov et al 2002;Langenhorst et al 2002). Intense shock-induced twinning in carbonate minerals occurs, for example, at Meteor Crater and West Hawk Lake Crater, Manitoba (Short and Bunch 1968), Flynn Creek Crater, Tennessee (Roddy 1968), and the Sedan nuclear explosion crater, New Mexico (Short 1968).…”

Section: Introductionmentioning

confidence: 99%

Petrographic, X-ray diffraction, and electron spin resonance analysis of deformed calcite: Meteor Crater, Arizona

Burt

Pope

Watkinson

2005

Meteoritics &Amp; Planetary Science

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Abstract-Calcite crystals within the Kaibab limestone in Meteor Crater, Arizona, are examined to understand how calcite is deformed during a meteorite impact. The Kaibab limestone is a silty finegrained and fossiliferous dolomudstone and the calcite crystals occur as replaced evaporite nodules with impact-induced twinning. Twinning in the calcite is variable with deformational regimes based on abundances of crystals with twins and twin densities within crystals. The twins are similar to those that are seen in low tectonically deformed regimes. Low levels of shock are inferred from minor peak broadening of the X-ray diffraction patterns (XRD) of the calcite crystals. In addition, electron spin resonance (ESR) spectroscopy data also indicates low shock levels (<3.0 GPa). Quantitative shock pressures and correlation between the XRD and ESR results are poor due to the inferred low shock levels in conjunction with the analytical error associated in calculation of the shock pressures.

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Experimental Techniques for the Simulation of Shock Metamorphism: A Case Study on Calcite

Cited by 23 publications

References 31 publications

The ICDP Lake Bosumtwi impact crater scientific drilling project (Ghana): Core LB‐08A litho‐log, related ejecta, and shock recovery experiments

The ICDP Lake Bosumtwi impact crater scientific drilling project (Ghana): Core LB‐08A litho‐log, related ejecta, and shock recovery experiments

A dual-layer Chicxulub ejecta sequence with shocked carbonates from the Cretaceous–Paleogene (K–Pg) boundary, Demerara Rise, western Atlantic

Petrographic, X-ray diffraction, and electron spin resonance analysis of deformed calcite: Meteor Crater, Arizona

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