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

0440054 - GLÚ 2015 RIV DE eng C - Conference Paper (international conference)
Ullemeyer, K. - Lokajíček, Tomáš - Keppler, R. - Vasin, R.N. - Behrmann, J. H.
Bulk rock elastic moduli at high pressures, derived from the mineral textures and from extrapolated laboratory data.
17th International Conference on Textures of Materials (ICOTOM 17). Dresden: Technische Universität Dresden, 2015, č. článku 012093. ISSN 1757-8981.
[International Conference on Textures of Materials (ICOTOM) /17./. Dresden (DE), 24.08.2014-29.08.2014]
Institutional support: RVO:67985831
Keywords : mineral textures * bulk rocks * laboratory data
Subject RIV: DC - Siesmology, Volcanology, Earth Structure

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.


Permanent Link: http://hdl.handle.net/11104/0243196