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The equation of state of Al,H-bearing SiO_2 stishovite to 58 GPa

Lakshtanov, Dmitry L. and Vanpeteghem, Carine B. and Jackson, Jennifer M. and Bass, Jay D. and Shen, Guoyin and Prakapenka, Vitali B. and Litasov, Konstantin and Ohtani, Eiji (2005) The equation of state of Al,H-bearing SiO_2 stishovite to 58 GPa. Physics and Chemistry of Minerals, 32 (7). pp. 466-470. ISSN 0342-1791. https://resolver.caltech.edu/CaltechAUTHORS:20130419-154511680

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Abstract

We have determined the P-V equation of state of Al-rich H-bearing SiO_2 stishovite by X-ray powder diffraction at pressures up to 58 GPa using synchrotron radiation. The sample contained 1.8 wt% Al_(2)O_3 and up to 500 ppm H_(2)O, and had a composition that would coexist with Mg-silicate perovskite in a subducted slab. By fitting a third-order Birch-Murnaghan equation of state to our compression data, we obtained a bulk modulus K_(T0)=298(7) GPa with K′=4.3(5). With K′ fixed to a value of 4, the bulk modulus K T0=304(3) GPa. Our results indicate that Al^3+ and H^+ have a small effect on the elastic properties of stishovite. Compared with data obtained up to 43.8 GPa, peak intensities changed and we observed a decreased quality of fit to a tetragonal unit cell at pressures of 49 GPa and higher. These changes may be an indication that the rutile↔CaCl_2 transition occurs between these pressures. After laser annealing of the sample at 58.3(10) GPa and subsequent decompression to room conditions, the cell volume is the same as before compression, giving strong evidence that the composition of the recovered sample is also unchanged. This suggests that Al and H are retained in the sample under extreme P-T conditions and that stishovite can be an agent for transporting water to the deepest lower mantle.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1007/s00269-005-0016-3DOIUNSPECIFIED
http://link.springer.com/article/10.1007%2Fs00269-005-0016-3PublisherUNSPECIFIED
ORCID:
AuthorORCID
Jackson, Jennifer M.0000-0002-8256-6336
Prakapenka, Vitali B.0000-0001-9270-2330
Additional Information:© 2005 Springer-Verlag. Received: 06 July 2004; Accepted: 23 May 2005; Published online: 27 September 2005. Authors would like to thank Stanislav Sinogeikin and Wolfgang Sturhahn for useful discussions and technical support during experiment. This research was supported by the National Science Foundation grant EAR-0135642 (to JDB). GSECARS is supported by the National Science Foundation—Earth Sciences (EAR-0217473), Department of Energy—Geosciences (DE-FG02-94ER14466)and the State of Illinois. Use of the APS was supported by the U.S. Department of Energy, Basic Energy Sciences, Office of Energy Research, under Contract No. W-31-109-Eng-38.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
NSFEAR-0135642
NSF Earth SciencesEAR-0217473
Department of Energy (DOE)DE-FG02-94ER14466
State of IllinoisUNSPECIFIED
Subject Keywords:Water in the mantle; High pressure; Synchrotron X-ray diffraction; Equation of state; Water-bearing stishovite
Issue or Number:7
Record Number:CaltechAUTHORS:20130419-154511680
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130419-154511680
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38048
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:23 Apr 2013 17:46
Last Modified:09 Mar 2020 13:19

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