Bulk rock elastic moduli at high pressures, derived from the mineral textures and from extrapolated laboratory data.

Ullemeyer, Klaus, Lokajíček, T., Keppler, Ruth, Vasin, R. N. and Behrmann, Jan H. (2015) Bulk rock elastic moduli at high pressures, derived from the mineral textures and from extrapolated laboratory data. Open Access IOP Conference Series: Materials Science and Engineering, 82 (1). 012093. DOI 10.1088/1757-899X/82/1/012093.

[img] Text
Ullemeyer et.al.pdf - Published Version
Available under License Creative Commons: Attribution 3.0.

Download (793Kb)

Supplementary data:

Abstract

The elastic anisotropy of bulk rock depends on the mineral textures, the crack fabric and external parameters like, e.g., confining pressure. The texture-related contribution to elastic anisotropy can be predicted from the mineral textures, the largely sample-dependent contribution of the other parameters must be determined experimentally. Laboratory measurements of the elastic wave velocities are mostly limited to pressures of the intermediate crust. We describe a method, how the elastic wave velocity trends and, by this means, the elastic constants can be extrapolated to the pressure conditions of the lower crust. The extrapolated elastic constants are compared to the texture-derived ones. Pronounced elastic anisotropy is evident for phyllosilicate minerals, hence, the approach is demonstrated for two phyllosilicate-rich gneisses with approximately identical volume fractions of the phyllosilicates but different texture types.

Document Type: Article
Keywords: Anisotropy; Elastic constants; Elastic waves; Extrapolation; Silicates; Textures; Wave propagation Confining pressures; Dependent contributions; Elastic anisotropy; Elastic wave velocity; Laboratory datum; Laboratory measurements; Mineral texture; Pressure conditions
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.1088/1757-899X/82/1/012093
ISSN: 1757-899X
Date Deposited: 18 May 2015 13:07
Last Modified: 15 Jan 2019 13:11
URI: http://oceanrep.geomar.de/id/eprint/28782

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...