X-Ray Topographic Study of the Real Structure of Minerals

Authier, A.; Zarka, A.

doi:10.1007/978-3-642-78523-8_12

Cited by 4 publications

(4 citation statements)

References 29 publications

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“…These features are believed to be due to plastic deformation (PD) taking place after the crystallization of diamond. The crystallographic direction of strain can be established applying the extinction criterion (Authier and Zarka, 1994) and this shows that, as expected, the deformation direction corresponds to that commonly found in structures with Fd-3m space group, where the energetically most favourable slip system is <110> {111}.…”

Section: Resultssupporting

confidence: 60%

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X-ray topographic study of a diamond from Udachnaya: Implications for the genetic nature of inclusions

Agrosì

Nestola

Tempesta

et al. 2016

Lithos

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Section: Resultssupporting

confidence: 60%

“…The resolution is about 1-2 μm. Characterization of the structural defects was performed by applying the extinction criteria to their diffraction contrasts, according to kinematical and dynamic X-ray diffraction theories (Authier and Zarka, 1994).…”

Section: Methodsmentioning

confidence: 99%

X-ray topographic study of a diamond from Udachnaya: Implications for the genetic nature of inclusions

Agrosì

Nestola

Tempesta

et al. 2016

Lithos

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“…The diffraction contrast was recorded on high-resolution photographic films (SR Kodak). Characterization of the structural defects was performed by applying the extinction criteria to their diffraction contrasts, according to kinematic and dynamic X-ray diffraction theories [47]. The detailed XRDT procedures used in this study are given in Agrosì, et al (2016) [11].…”

Section: Xrdtmentioning

confidence: 99%

Non-Destructive In Situ Study of Plastic Deformations in Diamonds: X-ray Diffraction Topography and µFTIR Mapping of Two Super Deep Diamond Crystals from São Luiz (Juina, Brazil)

et al. 2017

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Diamonds from Juina, Brazil, are well-known examples of superdeep diamond crystals formed under sublithospheric conditions and evidence would indicate their origins lie as deep as the Earth's mantle transition zone and the Lower Mantle. Detailed characterization of these minerals and of inclusions trapped within them may thus provide precious minero-petrogenetic information on their growth history in these inaccessible environments. With the aim of studying non-destructively the structural defects in the entire crystalline volume, two diamond samples from this locality, labelled JUc4 and BZ270, respectively, were studied in transmission mode by means of X-ray Diffraction Topography (XRDT) and micro Fourier Transform InfraRed Spectroscopy (µFTIR). The combined use of these methods shows a good fit between the mapping of spatial distribution of extended defects observed on the topographic images and the µFTIR maps corresponding to the concentration of N and H point defects. The results obtained show that both samples are affected by plastic deformation. In particular, BZ270 shows a lower content of nitrogen and higher deformation, and actually consists of different, slightly misoriented grains that contain sub-grains with a rounded-elongated shape. These features are commonly associated with deformation processes by solid-state diffusion creep under high pressure and high temperature.

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“…pastes up to 0.25 μm. Characterization of the structural defects was performed by applying the extinction criteria to their diffraction contrasts, according to kinematic and dynamic X-ray diffraction theories (Authier and Zarka 1994).…”

Section: X-ray Topographymentioning

confidence: 99%

Mn-tourmaline crystals from island of Elba (Italy): Growth history and growth marks

Agrosì

2006

American Mineralogist

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The growth history reconstruction of tourmaline macro-crystals from pegmatite pockets in the aplite veins of Grotta d'Oggi (island of Elba, Italy) was carried out using a multi-disciplinary and multi-analytical approach [X-ray diffraction topography (XRDT) and electron microprobe analysis (EMPA)]. The work covered in this paper is closely related to the previous crystal-chemical characterization of the same macro-crystals (Bosi et al. 2005). The tourmalines examined here are bi-colored crystals exhibiting greenish-yellow to colorless zoning perpendicular to and parallel to the c axis: the transition from the inner yellow regions to the colorless ones occurs suddenly. XRDT and EMPA studies show relationships between color and chemical zoning and crystal growth evolution, thus identifying two main growth stages, which developed under different conditions. The first stage corresponds to greenish-yellow Mn-tourmaline grown as a result of a 2D-growth mechanism in a F-rich pegmatitic environment; the second one corresponds to colorless elbaitic tourmaline, which developed chiefly by a spiral growth mechanism in an OH-rich hydrothermal environment. The structural defects found in greenish-yellow Mn-tourmaline (growth bands, absence of dislocations, near-uniform chemical element concentrations) are the same as those observed in beryl crystals from pegmatite pockets of the island of Elba. Therefore these features are growth marks that characterize the pegmatitic crystallization stage and differentiate it from the hydrothermal stage, in which the dislocations normal to the growing faces occurred. Hence, the role of tourmaline as a petrogenetic indicator can be extended from chemical composition to crystal growth, reflecting both chemical environment and growth mechanism, and contributing to a better understanding of mineral genesis in pegmatitic crystallization

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X-Ray Topographic Study of the Real Structure of Minerals

Cited by 4 publications

References 29 publications

X-ray topographic study of a diamond from Udachnaya: Implications for the genetic nature of inclusions

X-ray topographic study of a diamond from Udachnaya: Implications for the genetic nature of inclusions

Non-Destructive In Situ Study of Plastic Deformations in Diamonds: X-ray Diffraction Topography and µFTIR Mapping of Two Super Deep Diamond Crystals from São Luiz (Juina, Brazil)

Mn-tourmaline crystals from island of Elba (Italy): Growth history and growth marks

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