High-pressure infrared spectra of talc and lawsonite

Henry P. Scott; Zhenxian Liu; Russell J. Hemley; Quentin Williams

doi:10.2138/am.2007.2430

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Research Article| November 01, 2007

High-pressure infrared spectra of talc and lawsonite

Henry P. Scott;

Henry P. Scott *

1

Department of Physics and Astronomy, Indiana University South Bend, South Bend, Indiana 46634, U.S.A.

*

E-mail: [email protected]

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Zhenxian Liu;

Zhenxian Liu

2

Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, D.C. 20015, U.S.A.

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Russell J. Hemley;

Russell J. Hemley

2

Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, D.C. 20015, U.S.A.

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Quentin Williams

3

Department of Earth Sciences, University of California at Santa Cruz, Santa Cruz, California 95064, U.S.A.

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Author and Article Information

Henry P. Scott *

1

Department of Physics and Astronomy, Indiana University South Bend, South Bend, Indiana 46634, U.S.A.

Zhenxian Liu

2

Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, D.C. 20015, U.S.A.

Russell J. Hemley

2

Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, D.C. 20015, U.S.A.

Quentin Williams

3

Department of Earth Sciences, University of California at Santa Cruz, Santa Cruz, California 95064, U.S.A.

*

E-mail: [email protected]

Publisher: Mineralogical Society of America

Received: 22 Aug 2006

Accepted: 28 Jun 2007

First Online: 09 Mar 2017

Online ISSN: 1945-3027

Print ISSN: 0003-004X

American Mineralogist (2007) 92 (11-12): 1814–1820.

https://doi.org/10.2138/am.2007.2430

Abstract

We present high-pressure infrared spectra of two geologically important hydrous minerals: talc, Mg₃Si₄O₁₀(OH)₂ and lawsonite, CaAl₂Si₂O₇(OH)2·H₂O,·at room temperature. For lawsonite, our data span the far infrared region from 150 to 550 cm⁻¹ and extend to 25 GPa. We combine our new spectroscopic data with previously published high-pressure mid-infrared and Raman data to constrain the Grüneisen parameter and vibrational density of states under pressure. In the case of talc, we present high-pressure infrared data that span both the mid and far infrared from 150 to 3800 cm⁻¹ covering lattice, silicate, and hydroxyl stretching vibrations to a maximum pressure of 30 GPa. Both phases show remarkable metastability well beyond their nominal maximum thermodynamic stability at simultaneous high-pressure and high-temperature conditions.