In situ discovery of shock-induced graphite-diamond phase transition in gneisses from the Ries Crater, Germany

Goresy, A. El; Gillet, Philippe; Chen, Ming; Künstler, Friedel; Graup, G.; Stähle, Volker

doi:10.2138/am-2001-5-603

Cited by 75 publications

(47 citation statements)

References 35 publications

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“…Shifts were also observed after irradiation by neutrons (Guo et al 2004). An additional peak at 1590 cm −1 was also described in the previous studies, which is probably related to the amorphous carbon phase present as the result of shock metamorphism (El Goresy et al 2001, Kenkmann et al 2002. These observations on shock-produced diamonds are in good agreement with the Raman spectral properties of nanodiamonds from our Allende meteorite sample.…”

Section: Discussionsupporting

confidence: 91%

Micro-Raman study of nanodiamonds from Allende meteorite

et al. 2008

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Abstract. We have studied the Raman spectroscopic signatures of nanodiamonds from the Allende meteorite in which some portions must be of presolar origin as indicated by the isotopic compositions of various trace elements. The spectra of the meteoritic nanodiamond show a narrow peak at 1326 cm −1 and a broad band at 1590 cm −1 . Compared to the intensities of these peaks, the background fluorescence is relatively high. A significant frequency shift from 1332 to 1326 cm −1 , peak broadening, and appearance of a new peak at 1590 cm −1 might be due to shock effects during formation of the diamond grains. Such changes may have several origins: an increase in bond length, a change in the electron density function or charge transfer, or a combination of these factors. However, Raman spectroscopy alone does not allow distinguishing between a shock origin of the nanodiamonds and formation by a CVD process as is favored by most workers.

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Section: Discussionsupporting

confidence: 91%

Micro-Raman study of nanodiamonds from Allende meteorite

et al. 2008

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“…Shifts were also observed after irradiation by neutrons (Guo et al 2004). An additional peak at 1590 cm -1 was also described in the previous studies, which is probably related to the amorphous carbon phase present as the result of shock metamorphism (El Goresy et al 2001;Kenkmann et al 2002). These observations on shock-produced diamonds are in a good agreement with the Raman spectral properties of nanodiamonds from our Allende meteorite sample.…”

Section: Raman Frequency Shiftsupporting

confidence: 68%

“…Similar frequency shifts, broad bands (10-20 cm -1 at FWHM) and relatively high background fluorescence were observed in impact-induced diamond as well as in nanodiamond samples from different shock metamorphic environments such as terrestrial impact structures (El Goresy et al 2001) and meteorites (Greshake et al 2000;Mostefaoui et al 2002;Gucsik et al 2008a and b;Karczemska et al 2009) as well as in shock recovery experiments (Kenkmann et al 2002). We note, however, that the frequency shift of the band at 1332 cm -1 and the peak broadening from higher modes to the lower ones may also be assigned to the effects of phonon/quantum confinement (Yoshikawa et al 1995;Chen et al 1999;Sun et al 2000;Berg et al 2008).…”

Section: Raman Frequency Shiftsupporting

confidence: 57%

Micro-Raman study of the Allende meteoritic nanodiamonds: Supernova-driven shock wave origin is revisited

Gucsik¹

2011

Central European Geology

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I have studied the Raman spectroscopic signatures of nanodiamonds from the Allende meteorite, in which some portions must be of presolar origin as indicated by the isotopic compositions of various trace elements. The spectra of the meteoritic nanodiamonds show a narrow peak at 1326 cm -1 and a broad band at 1590 cm -1 . Compared to the intensities of these peaks, the background fluorescence is relatively high. A significant frequency shift from 1332 to 1326 cm -1 , peak broadening, and appearance of a new peak at 1590 cm -1 might be due to shock effects during formation of the diamond grains. Such changes may have several origins: an increase in bond length, a change in the electron density function or charge transfer, or a combination of these factors. However, Raman spectroscopy alone does not allow distinguishing between a shock origin of the nanodiamonds and formation by a CVD process, as is favored by most workers.

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“…As earlier summarized, transition from graphite to diamond occurs in various suevite types. El Goresy et al (2001) estimate the peak pressure of graphite-diamond transition in gneisses at 30-40 GPa. Other findings of diamonds in glass bombs (Rost et al 1978, Abbott et al 1996, Siebenshock et al 1998 indicate transition pressures of 60-80 GPa.…”

Section: Discussionmentioning

confidence: 99%

“…Subsequently, impact diamonds have been investigated in the Ries crater by several groups. They were found in suevite whole-rock samples (Hough et al 1995, Abbot et al 1998, in glass bombs (Rost et al 1978, Abbott et al 1996, Siebenshock et al 1998, and in highly shocked crystalline fragments (El Goresy et al 1999). According to Schmitt et al (1999) the major carriers of diamonds in Ries are glass bombs of the fallout suevite formed by melting at shock pressures above 60 GPa, and the source of impact diamonds seems to be highly shocked graphite-bearing gneisses.…”

Section: Introductionmentioning

confidence: 95%

The search for fullerenes in rocks from the Ries impact crater

Frank

Jehlička

Hamplová

et al. 2005

Meteoritics &Amp; Planetary Science

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Abstract-Since their discovery, fullerenes have been reported from various geological environments. One group of these findings has been related to bolide impacts, e.g., the Sudbury crater and the K-T and P-T boundaries. Impact rocks of the Ries crater, Germany, including samples of suevites, metamorphosed crystalline clasts, and glass bombs, have been collected in the Otting, Alteb¸rg, and Seelbronn quarries. No fullerenes in concentrations above 1 ppb have been found in analyzed samples. Laser desorption time-of-flight mass spectrometry (LD-TOF-MS) confirmed the absence of fullerenes in the analyzed samples. These results support the concept that the Ries impactor was a stony meteorite.

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In situ discovery of shock-induced graphite-diamond phase transition in gneisses from the Ries Crater, Germany

Cited by 75 publications

References 35 publications

Micro-Raman study of nanodiamonds from Allende meteorite

Micro-Raman study of nanodiamonds from Allende meteorite

Micro-Raman study of the Allende meteoritic nanodiamonds: Supernova-driven shock wave origin is revisited

The search for fullerenes in rocks from the Ries impact crater

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