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American Mineralogist; November 2007; v. 92; no. 11-12; p. 1814-1820; DOI: 10.2138/am.2007.2430
© 2007 Mineralogical Society of America
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High-pressure infrared spectra of talc and lawsonite

Henry P. Scott1,*, Zhenxian Liu2, Russell J. Hemley2 and Quentin Williams3

1 Department of Physics and Astronomy, Indiana University South Bend, South Bend, Indiana 46634, U.S.A.
2 Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, D.C. 20015, U.S.A.
3 Department of Earth Sciences, University of California at Santa Cruz, Santa Cruz, California 95064, U.S.A.

Correspondence: * E-mail: hpscott{at}iusb.edu

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.

Key Words: Lawsonite • talc • hydrous silicates • high pressure • infrared




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A.E. Gleason, S.A. Parry, A.R. Pawley, R. Jeanloz, and S.M. Clark
Pressure-temperature studies of talc plus water using X-ray diffraction
American Mineralogist, July 1, 2008; 93(7): 1043 - 1050.
[Abstract] [Full Text] [PDF]


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