Volume behavior of hydrous minerals at high pressure and temperature: II. Compressibilities of lawsonite, zoisite, clinozoisite, and epidote

T. J.B. Holland; S. A.T. Redfern; A. R. Pawley

doi:10.2138/am-1996-3-408

Volume behavior of hydrous minerals at high pressure and temperature: II. Compressibilities of lawsonite, zoisite, clinozoisite, and epidote

T. J.B. Holland^*, S. A.T. Redfern, A. R. Pawley

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

The pressure dependence of the lattice parameters of natural zoisite [Ca₂Al₃Si₃O₁₂(OH)], clinozoisite [Ca₂Al₃Si₃O₁₂(OH)], and epidote [Ca₂Al₂FeSi₃O₁₂(OH)] as well as synthetic lawsonite [CaAl₂Si₂O₇(OH)₂·H ₂O] have been measured at ambient temperatures by energy-dispersive X-ray diffraction in a diamond-anvil cell. The experimental results for each phase may be summarized concisely in terms of the ambient-temperature isothermal bulk modulus K₂₉₈ (using the Murnaghan equation of state and assuming K′ = 4): Lawsonite: K₂₉₈ = 191 ± 5 GPa; zoisite: K₂₉₈ = 279 ± 9 GPa; clinozoisite: A₂₉₈ = 154 ± 6 GPa; epidote: K₂₉₈ = 162 ± 4 GPa. These new measurements, together with the new thermal expansion data in the companion paper (Pawley et al. 1996), were used to calculate some phase equilibria for lawsonite dehydration to high pressures for comparison with experimental brackets. Important discrepancies between calculated and experimentally determined reactions become evident above 3 GPa.

Original language	English
Pages (from-to)	341-348
Number of pages	8
Journal	American Mineralogist
Volume	81
Issue number	3-4
DOIs	https://doi.org/10.2138/am-1996-3-408
Publication status	Published - 1 Jan 1996

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title = "Volume behavior of hydrous minerals at high pressure and temperature: II. Compressibilities of lawsonite, zoisite, clinozoisite, and epidote",

abstract = "The pressure dependence of the lattice parameters of natural zoisite [Ca2Al3Si3O12(OH)], clinozoisite [Ca2Al3Si3O12(OH)], and epidote [Ca2Al2FeSi3O12(OH)] as well as synthetic lawsonite [CaAl2Si2O7(OH)2·H 2O] have been measured at ambient temperatures by energy-dispersive X-ray diffraction in a diamond-anvil cell. The experimental results for each phase may be summarized concisely in terms of the ambient-temperature isothermal bulk modulus K298 (using the Murnaghan equation of state and assuming K′ = 4): Lawsonite: K298 = 191 ± 5 GPa; zoisite: K298 = 279 ± 9 GPa; clinozoisite: A298 = 154 ± 6 GPa; epidote: K298 = 162 ± 4 GPa. These new measurements, together with the new thermal expansion data in the companion paper (Pawley et al. 1996), were used to calculate some phase equilibria for lawsonite dehydration to high pressures for comparison with experimental brackets. Important discrepancies between calculated and experimentally determined reactions become evident above 3 GPa.",

author = "Holland, {T. J.B.} and Redfern, {S. A.T.} and Pawley, {A. R.}",

year = "1996",

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doi = "10.2138/am-1996-3-408",

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volume = "81",

pages = "341--348",

journal = "American Mineralogist",

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T2 - II. Compressibilities of lawsonite, zoisite, clinozoisite, and epidote

AU - Holland, T. J.B.

AU - Redfern, S. A.T.

AU - Pawley, A. R.

PY - 1996/1/1

Y1 - 1996/1/1

N2 - The pressure dependence of the lattice parameters of natural zoisite [Ca2Al3Si3O12(OH)], clinozoisite [Ca2Al3Si3O12(OH)], and epidote [Ca2Al2FeSi3O12(OH)] as well as synthetic lawsonite [CaAl2Si2O7(OH)2·H 2O] have been measured at ambient temperatures by energy-dispersive X-ray diffraction in a diamond-anvil cell. The experimental results for each phase may be summarized concisely in terms of the ambient-temperature isothermal bulk modulus K298 (using the Murnaghan equation of state and assuming K′ = 4): Lawsonite: K298 = 191 ± 5 GPa; zoisite: K298 = 279 ± 9 GPa; clinozoisite: A298 = 154 ± 6 GPa; epidote: K298 = 162 ± 4 GPa. These new measurements, together with the new thermal expansion data in the companion paper (Pawley et al. 1996), were used to calculate some phase equilibria for lawsonite dehydration to high pressures for comparison with experimental brackets. Important discrepancies between calculated and experimentally determined reactions become evident above 3 GPa.

AB - The pressure dependence of the lattice parameters of natural zoisite [Ca2Al3Si3O12(OH)], clinozoisite [Ca2Al3Si3O12(OH)], and epidote [Ca2Al2FeSi3O12(OH)] as well as synthetic lawsonite [CaAl2Si2O7(OH)2·H 2O] have been measured at ambient temperatures by energy-dispersive X-ray diffraction in a diamond-anvil cell. The experimental results for each phase may be summarized concisely in terms of the ambient-temperature isothermal bulk modulus K298 (using the Murnaghan equation of state and assuming K′ = 4): Lawsonite: K298 = 191 ± 5 GPa; zoisite: K298 = 279 ± 9 GPa; clinozoisite: A298 = 154 ± 6 GPa; epidote: K298 = 162 ± 4 GPa. These new measurements, together with the new thermal expansion data in the companion paper (Pawley et al. 1996), were used to calculate some phase equilibria for lawsonite dehydration to high pressures for comparison with experimental brackets. Important discrepancies between calculated and experimentally determined reactions become evident above 3 GPa.

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Volume behavior of hydrous minerals at high pressure and temperature: II. Compressibilities of lawsonite, zoisite, clinozoisite, and epidote

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