Changes in the hydrogen-bonded structure of lawsonite: An experimental study to 2.5 GPa and 400 °C

Abstract

In-situ Raman spectroscopic measurements of lawsonite in the OH and H₂O stretching region were conducted up to approximately 2.5 GPa and 400 °C with a hydrothermal diamondanvil cell. In the experimental design at room temperature, the ratio of band-area and the width at half maximum of the decomposed Raman band shows discontinuities at 0.8 GPa, and correspondingly, the 695-cm⁻¹ peak in the low-wavenumber region was split into two peaks. In the experiments at high temperature, the splitting of the 695-cm⁻¹ peak was induced at 2.4 GPa and 250 °C. These findings demonstrate the existence of discontinuities in the pressure response of the strength of the hydrogen bonds, which suggests a possible change of the hydrogen-bonded structure in lawsonite under these conditions.

Keywords

lawsonite / hydrogen bonded / Raman spectra / high pressure

References

Bassett W. A., Shen A. H., Bucknum M., . A New Diamond-Anvil Cell for Hydrothermal Studies to 2.5 GPa and from −190 °C to 1 200 °C. Review of Scientific Instruments, 1993, 64(8): 2340-2345.

Baur W. H.. Crystal Structure Refinement of Lawsonite. American Mineralogist, 1978, 63: 311-315.

Comodi P., Zanazzi P. F.. Effects of Temperature and Pressure on the Structure of Lawsonite. American Mineralogist, 1996, 81: 833-841.

Daniel I., Fiquet G., Gillet P., . High-Pressure Behaviour of Lawsonite: A Phase Transition at 8.6 GPa. European Journal of Mineralogy, 2000, 12: 721-733.

Kolesov B. A., Lager G. A., Schultz A. J.. Behaviour of H₂O and OH in Lawsonite: A Single-Crystal Neutron Diffraction and Raman Spectroscopic Investigation. European Journal of Mineralogy, 2008, 20: 63-72.

Labotka T. C., Rossman G. R.. The Infrared Pleochroism of Lawsonite: The Orientation of the Water and Hydroxide Groups. American Mineralogist, 1974, 59(7–8): 799-806.

Le-Cleac’h A., Gillet P.. IR and Raman Spectroscopic Study of Natural Lawsonite. European Journal of Mineralogy, 1990, 2: 43-53.

Libowitzky E., Armbruster T.. Low-Temperature Phase Transitions and the Role of Hydrogen Bonds in Lawsonite. American Mineralogist, 1995, 80: 1277-1285.

Libowitzky E., Rossman G. R.. FTIR Spectroscopy of Lawsonite between 82 and 325 K. American Mineralogist, 1996, 81: 1080-1091.

Meyer H. W., Marion S., Sondergeld P., . Displacive Components of the Low-Temperature Phase Transitions in Lawsonite. American Mineralogist, 2001, 86: 566-577.

Poli S., Schmidt M. W.. Petrology of Subducted Slabs. Annual Review of Earth Planetary Sciences, 2002, 30: 207-235.

Schmidt C., Ziemann M. A.. In-Situ Raman Spectroscopy of Quartz: A Pressure Senor for Hydrothermal Diamond-Anvil Cell Experiments at Elevated Temperatures. American Mineralogist, 2000, 85(11–12): 1725-1734.

Scott H. P., Williams Q.. An Infrared Spectroscopic Study of Lawsonite to 20 GPa. Physics and Chemistry of Minerals, 1999, 26(6): 437-445.

Scott H. P., Liu Z. X., Hemley R. J., . High-Pressure Infrared Spectra of Talc and Lawsonite. American Mineralogist, 2007, 92: 1814-1820.

Song S. G., Su L., Niu Y. L., . Two Types of Peridotite in North Qaidam UHPM Belt and Their Tectonic Implications for Oceanic and Continental Subduction: A Review. Journal of Asian Earth Sciences, 2009, 35(3–4): 285-297.

Zack T., Rivers T., Brumm R., . Cold Subduction of Oceanic Crust: Implications from a Lawsonite Eclogite from the Dominican Republic. European Journal of Mineralogy, 2004, 16: 909-916.

Zhang L. F., Wang Q. J., Song S. G.. Lawsonite Blueschist in Northern Qilian, NW China: P-T Pseudosections and Petrologic Implications. Journal of Asian Earth Sciences, 2009, 35(3–4): 354-366.