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Pargasite at high pressure and temperature.

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Title: Pargasite at high pressure and temperature.
Authors: Comboni, Davide1, Lotti, Paolo1,2 paolo.lotti@unimi.it, Gatta, G. Diego1,3, Merlini, Marco1, Liermann, Hanns-Peter4, Frost, Daniel J.5
Source: Physics & Chemistry of Minerals. Mar2018, Vol. 45 Issue 3, p259-278. 20p.
Subjects: Crystals, Diamond anvil cell, High pressure chemistry, Thermoelasticity, Diffractive scattering
Abstract: The P-T phase stability field, the thermoelastic behavior and the P-induced deformation mechanisms at the atomic scale of pargasite crystals, from the “phlogopite peridotite unit” of the Finero mafic-ultramafic complex (Ivrea-Verbano Formation, Italy), have been investigated by a series of in situ experiments: (a) at high pressure (up to 20.1 GPa), by single-crystal synchrotron X-ray diffraction with a diamond anvil cell, (b) at high temperature (up to 823 K), by powder synchrotron X-ray diffraction using a hot air blower device, and (c) at simultaneous HP-HT conditions, by single-crystal synchrotron X-ray diffraction with a resistive-heated diamond anvil cell (Pmax = 16.5 GPa, Tmax = 1200 K). No phase transition has been observed within the P-T range investigated. At ambient T, the refined compressional parameters, calculated by fitting a second-order Birch-Murnaghan Equation of State (BM-EoS), are: V0 = 915.2(8) Å3 and KP0,T0 = 95(2) GPa (βP0,T0 = 0.0121(2) GPa−1) for the unit-cell volume; a0 = 9.909(4) Å and K(a)P0,T0 = 76(2) GPa for the a-axis; b0 = 18.066(7) Å and K(b)P0,T0 = 111(2) GPa for the b-axis; c0 = 5.299(5) Å and K(c)P0,T0 = 122(12) GPa for the c-axis [K(c)P0,T0 ~ K(b)P0,T0 > K(a)P0,T0]. The high-pressure structure refinements (at ambient T) show a moderate contraction of the TO4 double chain and a decrease of its bending in response to the hydrostatic compression, along with a pronounced compressibility of the A- and M(4)-polyhedra [KP0,T0(A) = 38(2) GPa, KP0,T0(M4) = 79(5) GPa] if compared to the M(1)-, M(2)-, M(3)-octahedra [KP0,T0(M1,2,3) ≤ 120 GPa] and to the rigid tetrahedra [KP0,T0(T1,T2) ~ 300 GPa]. The thermal behavior, at ambient pressure up to 823 K, was modelled with Berman’s formalism, which gives: V0 = 909.1(2) Å3, α0 = 2.7(2)·10−5 K−1 and α1 = 1.4(6)·10−9 K−2 [with α0(a) = 0.47(6)·10−5 K−1, α0(b) = 1.07(4)·10−5 K−1, and α0(c) = 0.97(7)·10−5 K−1]. The petrological implications for the experimental findings of this study are discussed. [ABSTRACT FROM AUTHOR]
Copyright of Physics & Chemistry of Minerals is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Pargasite at high pressure and temperature.
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  Data: <searchLink fieldCode="AR" term="%22Comboni%2C+Davide%22">Comboni, Davide</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Lotti%2C+Paolo%22">Lotti, Paolo</searchLink><relatesTo>1,2</relatesTo><i> paolo.lotti@unimi.it</i><br /><searchLink fieldCode="AR" term="%22Gatta%2C+G%2E+Diego%22">Gatta, G. Diego</searchLink><relatesTo>1,3</relatesTo><br /><searchLink fieldCode="AR" term="%22Merlini%2C+Marco%22">Merlini, Marco</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Liermann%2C+Hanns-Peter%22">Liermann, Hanns-Peter</searchLink><relatesTo>4</relatesTo><br /><searchLink fieldCode="AR" term="%22Frost%2C+Daniel+J%2E%22">Frost, Daniel J.</searchLink><relatesTo>5</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Physics+%26+Chemistry+of+Minerals%22">Physics & Chemistry of Minerals</searchLink>. Mar2018, Vol. 45 Issue 3, p259-278. 20p.
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  Data: <searchLink fieldCode="DE" term="%22Crystals%22">Crystals</searchLink><br /><searchLink fieldCode="DE" term="%22Diamond+anvil+cell%22">Diamond anvil cell</searchLink><br /><searchLink fieldCode="DE" term="%22High+pressure+chemistry%22">High pressure chemistry</searchLink><br /><searchLink fieldCode="DE" term="%22Thermoelasticity%22">Thermoelasticity</searchLink><br /><searchLink fieldCode="DE" term="%22Diffractive+scattering%22">Diffractive scattering</searchLink>
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  Data: The <italic>P</italic>-<italic>T</italic> phase stability field, the thermoelastic behavior and the <italic>P</italic>-induced deformation mechanisms at the atomic scale of pargasite crystals, from the “phlogopite peridotite unit” of the Finero mafic-ultramafic complex (Ivrea-Verbano Formation, Italy), have been investigated by a series of in situ experiments: (a) at high pressure (up to 20.1 GPa), by single-crystal synchrotron X-ray diffraction with a diamond anvil cell, (b) at high temperature (up to 823 K), by powder synchrotron X-ray diffraction using a hot air blower device, and (c) at simultaneous H<italic>P</italic>-H<italic>T</italic> conditions, by single-crystal synchrotron X-ray diffraction with a resistive-heated diamond anvil cell (<italic>P</italic>max = 16.5 GPa, <italic>T</italic>max = 1200 K). No phase transition has been observed within the <italic>P</italic>-<italic>T</italic> range investigated. At ambient <italic>T</italic>, the refined compressional parameters, calculated by fitting a second-order Birch-Murnaghan Equation of State (BM-EoS), are: <italic>V</italic>0 = 915.2(8) Å3 and <italic>K</italic><italic>P</italic>0,<italic>T</italic>0 = 95(2) GPa (<italic>β</italic><italic>P</italic>0,<italic>T</italic>0 = 0.0121(2) GPa−1) for the unit-cell volume; <italic>a</italic>0 = 9.909(4) Å and <italic>K</italic>(<italic>a)</italic><italic>P</italic>0,<italic>T</italic>0 = 76(2) GPa for the <italic>a</italic>-axis; <italic>b</italic>0 = 18.066(7) Å and <italic>K</italic>(<italic>b)</italic><italic>P</italic>0,<italic>T</italic>0 = 111(2) GPa for the <italic>b</italic>-axis; <italic>c</italic>0 = 5.299(5) Å and <italic>K</italic>(<italic>c</italic>)<italic>P</italic>0,<italic>T</italic>0 = 122(12) GPa for the <italic>c</italic>-axis [<italic>K</italic>(<italic>c</italic>)<italic>P</italic>0,<italic>T</italic>0 ~ <italic>K</italic>(<italic>b</italic>)<italic>P</italic>0,<italic>T</italic>0 > <italic>K</italic>(<italic>a</italic>)<italic>P</italic>0,<italic>T</italic>0]. The high-pressure structure refinements (at ambient <italic>T</italic>) show a moderate contraction of the TO4 double chain and a decrease of its bending in response to the hydrostatic compression, along with a pronounced compressibility of the A- and M(4)-polyhedra [<italic>K</italic><italic>P</italic>0,<italic>T</italic>0(A) = 38(2) GPa, <italic>K</italic><italic>P</italic>0,<italic>T</italic>0(M4) = 79(5) GPa] if compared to the M(1)-, M(2)-, M(3)-octahedra [<italic>K</italic><italic>P</italic>0,<italic>T</italic>0(M1,2,3) ≤ 120 GPa] and to the rigid tetrahedra [<italic>K</italic><italic>P</italic>0,<italic>T</italic>0(T1,T2) ~ 300 GPa]. The thermal behavior, at ambient pressure up to 823 K, was modelled with Berman’s formalism, which gives: <italic>V</italic>0 = 909.1(2) Å3, α0 = 2.7(2)·10−5 K−1 and α1 = 1.4(6)·10−9 K−2 [with α0(<italic>a</italic>) = 0.47(6)·10−5 K−1, α0(<italic>b</italic>) = 1.07(4)·10−5 K−1, and α0(<italic>c</italic>) = 0.97(7)·10−5 K−1]. The petrological implications for the experimental findings of this study are discussed. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Physics & Chemistry of Minerals is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s00269-017-0915-0
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        Text: English
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        StartPage: 259
    Subjects:
      – SubjectFull: Crystals
        Type: general
      – SubjectFull: Diamond anvil cell
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      – SubjectFull: High pressure chemistry
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      – SubjectFull: Thermoelasticity
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      – SubjectFull: Diffractive scattering
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      – TitleFull: Pargasite at high pressure and temperature.
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              Text: Mar2018
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