Poisson's ratio of eclogite: the role of retrogression

Gao, S., Kern, H., Jin, Z. M., Popp, T., Jin, S. Y., Zhang, H. F. and Zhang, B. R. (2001) Poisson's ratio of eclogite: the role of retrogression Earth and Planetary Science Letters, 192 (4). pp. 523-531. DOI 10.1016/s0012-821x(01)00484-8.

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Available laboratory measurements of combined P- and S-wave velocities of eclogites from the Dabie-Sulu ultrahigh-pressure metamorphic belt and data from Manghnani et al. [J. Gcophys. Res. 79 (1974) 5427-5446] show clear positive correlations between Poisson's ratio and the intrinsic water content H(2)O(+) for samples with SiO(2) < 56% with the correlation coefficient r of 0.63-0.72, There are no significant correlations (/r/less than or equal to0.43) between Poisson's ratio and other major oxides. The positive correlations are interpreted to result from hydration of eclogites during their exhumation and exposure at the surface. Our best estimates of the average Poisson's ratios for unaltered quartz-bearing eclogites with H(2)O(+) < 1.0% are 0.24-0.25 (+/- 0.01), which is identical to that calculated from single crystal elastic properties, but lower than the averages (0.27 +/- 0.02) of measurements compiled by Rudnick and Fountain [Rev. Geophys. 33 (1995) 267-309] and Christensen [J. Geophys. Res. 101 (1996) 3139-3156]. Accordingly, unaltered quartz-bearing eclogites have Poisson's ratios distinct from mafic granulites (0.28 +/- 0.01) and marginally different from ultramafic rocks (0.26 +/- 0.02). (C) 2001 Elsevier Science B.V. All rights reserved.

Document Type: Article
Keywords: eclogite Poisson's ratio retrograde metamorphism granulites peridotites lower continental-crust mantle boundary wave velocities rocks geochemistry granulites china moho belt
Research affiliation: Kiel University
DOI etc.: 10.1016/s0012-821x(01)00484-8
ISSN: 0012-821X
Date Deposited: 02 Feb 2012 07:25
Last Modified: 08 Oct 2012 10:39
URI: http://eprints.uni-kiel.de/id/eprint/16279

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