High-pressure structural study of muscovite

Comodi, Paola; Zanazzi, P. F.

doi:10.1007/bf00202297

Cited by 74 publications

(31 citation statements)

References 22 publications

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“…It is difficult to assess rigorously the effects of T on the compressibility of muscovite and paragonite, but by combining their low-T compressibility data with the low-P thermal expansion data of Catti et al (1989), Comodi & Zanazzi (1995) concluded that, as expected, T and P generally have opposite effects on muscovite. Unfortunately, combining two separate datasets precluded rigorous quantification of the opposing effects.…”

Section: Discussionmentioning

confidence: 99%

“…Two key results of the compressibility and highpressure crystal-structure work simultaneously performed by Comodi & Zanazzi (1995, 1997 can be summarized as follows: (1) the observed compressibilities and crystal structures at high pressure are systematically related to the Na/(Na + K) values of the three micas studied, and (2) the changes in structure occurring as a function of pressure affect the stability of the micas, especially muscovite. Also affected are the crystallochemical behavior of muscovite and paragonite in various petrological and structural regimes.…”

Section: Crystallochemical Aspectsmentioning

confidence: 99%

“…Moreover, Sassi et al (1994) and Guidotti & Sassi (1976, 1998 have reviewed how the occurrences of muscovite and paragonite (including their polytypes) and muscovite-paragonite immiscibility are strongly correlated with P-T conditions of crystallization. For mica compressibility, we will utilize (a) the results of Hazen & Finger (1978), which show that layer silicates (phlogopite and chlorite) are highly compressible, especially along the c dimension, and (b) the recently published data of Comodi & Zanazzi (1995, 1997, who combined compressibility data and crystalstructure refinement results for three carefully chosen, naturally occurring muscovite and paragonite specimens, all with compositions that are essentially in the Na-K pseudobinary system muscovite-paragonite and having Na/(Na + K) values of 7.14, 38.14, and 88.0 mole %. The parageneses of these micas are summarized in Comodi & Zanazzi (1995, 1997.…”

Section: Introductionmentioning

confidence: 99%

“…For mica compressibility, we will utilize (a) the results of Hazen & Finger (1978), which show that layer silicates (phlogopite and chlorite) are highly compressible, especially along the c dimension, and (b) the recently published data of Comodi & Zanazzi (1995, 1997, who combined compressibility data and crystalstructure refinement results for three carefully chosen, naturally occurring muscovite and paragonite specimens, all with compositions that are essentially in the Na-K pseudobinary system muscovite-paragonite and having Na/(Na + K) values of 7.14, 38.14, and 88.0 mole %. The parageneses of these micas are summarized in Comodi & Zanazzi (1995, 1997. The sodian muscovite with a Na/(Na + K) value of 38.14 mole % essentially lies at the Na-limit for muscovite on the muscovite-paragonite solvus proposed by Guidotti et al (1994a).…”

Section: Introductionmentioning

confidence: 99%

“…The sodian muscovite with a Na/(Na + K) value of 38.14 mole % essentially lies at the Na-limit for muscovite on the muscovite-paragonite solvus proposed by Guidotti et al (1994a). The results of Comodi & Zanazzi (1995, 1997 are summarized in Figure 1 and in the next paragraph.…”

Section: Introductionmentioning

confidence: 99%

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The Contrasting Responses of Muscovite and Paragonite to Increasing Pressure: Petrological Implications

Guidotti¹,

Sassi²,

Comodi³

et al. 2000

The Canadian Mineralogist

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The incorporation of Fe, Mg, and Si into muscovite in response to increase of pressure (P) has long been recognized. In the context of the appropriate mineral assemblages, the extent of this substitution has been calibrated to serve as a very useful geobarometer for high-P parageneses. In marked contrast, little or no Fm i.e., ⌺(Mg + Fe total ), substitutes into paragonite regardless of P. To date, Fm substitution into muscovite has been considered only in terms of ⌬V r with little consideration of the crystallochemical aspects of this substitution. Moreover, the substitution seems to occur in response to simple exchange-reactions involving little or no dehydration. Such reactions typically have a negligible ⌬V r . Drawing upon the implications of studies combining high-P refinement of the crystal structures and measurement of compressibility, we suggest that high P causes structural changes in low-Fm muscovite that destabilize it. However, implementation of the Fm substitution facilitates structural adjustments, which reduce this instability. In contrast, paragonite is not only intrinsically less compressible than muscovite, but any substantial amount of Fm substitution would destabilize it.Keywords: muscovite, paragonite, celadonite, mica, crystal structure, compressibility, high pressure. SOMMAIREOn connait depuis longtemps l'incorporation du Fe, du Mg, et du Si dans la structure de la muscovite en réponse à une augmentation de la pression (P). Dans le contexte d'assemblages de minéraux appropriés, la portée de cet écart par rapport à la composition idéale sert de géobaromètre très utile pour étudier les paragenèses formées à pression élevée. Il est remarquable, par contre, que très peu du composant Fm, c'est-à-dire ⌺(Mg + Fe total ), est incorporé dans la paragonite, quelle que soit la pression. Jusqu'à maintenant, on a rationalisé l'incorporation de Fm dans la muscovite uniquement en termes de ⌬V r , sans trop se préoccuper des considérations cristallochimiques de cette substitution. De plus, la substitution semble intervenir en réponse à de simples réactions d'échange impliquant très peu de déshydratation ou bien sans déshydratation. De telles réactions typiquement on une valeur très faible de ⌬V r , ou bien elle est nulle. Nous tirons profit des études récentes des structures à pression élevée et des mesures de leur compressibilité, et nous proposons qu'à pression élevée, des changements structuraux mènent à la déstabilisation de muscovite à faible teneur en Fm. L'incorporation du composant Fm facilite les ajustements structuraux, et réduit ainsi cette instabilité. En revanche, la paragonite serait non seulement intrinsèquement moins compressible que la muscovite, mais toute ajout du composant Fm mènerait à sa déstabilisation.(Traduit par la Rédaction)

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Section: Discussionmentioning

confidence: 99%

Section: Crystallochemical Aspectsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Contrasting Responses of Muscovite and Paragonite to Increasing Pressure: Petrological Implications

Guidotti¹,

Sassi²,

Comodi³

et al. 2000

The Canadian Mineralogist

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Comparative study of the HP‐HTbehavior of a layered silicate apophyllite in water and paraffin oil

Likhacheva

Goryaĭnov

Ignatov

et al. 2022

J Raman Spectroscopy

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The interaction of porous minerals with liquids, especially water, is involved in many technological and geochemical processes. Apophyllite (K,Na) Ca 4 [Si 8 O 20 ](F,OH) . 8H 2 O, exhibiting mixed properties of layered and framework microporous silicates, is a promising object to model the interaction of a fluid with porous material. It was studied by the in situ Raman spectroscopy at simultaneously high pressure (HP) and high temperature (HT) up to 225 C and 9 GPa in order to clarify the effect of the composition of the pressure medium and the temperature on its HP behavior. Penetrating (water) and nonpenetrating (paraffin oil) media were used. Independently of the compressing medium, at HT, the lattice vibrational modes of apophyllite demonstrate regular pressure shifts. Almost uniform shift rates imply little differentiation between the compression of silicate layers and interlayer ion-molecular assemblage. Similar HP behavior of apophyllite in penetrating and nonpenetrating media indicates no pressure-induced overhydration within 1-9 GPa. Thereby, the significance of such structural factors, as a limited H 2 O mobility and relatively strong contacts between silicate layers, determining low structure tolerance towards the penetration of additional molecules, is emphasized. The elevated temperature does not affect the mobility of the interlayer H 2 O molecules to allow the pressure-induced intercalation in apophyllite.

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Stimulated Raman scattering in natural crystals of fluorapatite, Ca₅(PO₄)₃F

Kaminskii

Bohatý

Lux

et al. 2016

Laser & Photonics Reviews

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Hexagonal Ca5(PO4)3F, known as natural crystal fluorapatite and oldest host‐crystal for Ln3+‐lasant ions, is presented as a Raman‐active material. High‐order Raman‐induced χ(3)‐nonlinear processes are discovered in natural crystals of fluorapatite under picosecond pumping at 1.064 μm and 0.532 μm wavelength. A multitude of Stokes and anti‐Stokes components is generated in the ultraviolet, visible and near‐infrared spectral region by stimulated Raman scattering (SRS) and Raman four‐wave mixing (FWHM), resulting in a frequency comb with a width of 520 THz. The spectral lines are identified and attributed to the ν1(Ag) vibration mode of the tetrahedral [PO4] units which is related to a Raman shift of ωSRS ≈ 965 cm−1. The first Stokes steady‐state Raman gain coefficient in the near‐infrared spectral range is estimated to be >0.38 cm·GW−1. Finally, a short review of SRS‐promoting vibration modes and observed χ(3)‐ nonlinear interactions in all known SRS‐active natural crystals (minerals) is given.

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High-pressure structural study of muscovite

Cited by 74 publications

References 22 publications

The Contrasting Responses of Muscovite and Paragonite to Increasing Pressure: Petrological Implications

The Contrasting Responses of Muscovite and Paragonite to Increasing Pressure: Petrological Implications

Comparative study of the HP‐HTbehavior of a layered silicate apophyllite in water and paraffin oil

Stimulated Raman scattering in natural crystals of fluorapatite, Ca₅(PO₄)₃F

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High-pressure structural study of muscovite

Cited by 74 publications

References 22 publications

The Contrasting Responses of Muscovite and Paragonite to Increasing Pressure: Petrological Implications

The Contrasting Responses of Muscovite and Paragonite to Increasing Pressure: Petrological Implications

Comparative study of the HP‐HTbehavior of a layered silicate apophyllite in water and paraffin oil

Stimulated Raman scattering in natural crystals of fluorapatite, Ca5(PO4)3F

Contact Info

Product

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Stimulated Raman scattering in natural crystals of fluorapatite, Ca₅(PO₄)₃F