Apparent activation energy and rate-limiting process estimation from natural shale deformed by pressure solution in shallow subduction zone.

Kawabata, K., Tanaka, H., Kitamura, Yujin and Ma, K.-F. (2009) Apparent activation energy and rate-limiting process estimation from natural shale deformed by pressure solution in shallow subduction zone. Earth and Planetary Science Letters, 287 (1/2). pp. 57-63. DOI 10.1016/j.epsl.2009.07.032.

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Abstract

Pressure solution is one of the main deformation mechanisms for lithify and stress release in the rocks from shallow subduction zones. We observed temperature-dependent pressure solution development in naturally deformed shale in Shimanto accretionary complex in southwest Japan. The pressure solution develops with shear-dominated or co-axial-dominated deformation. We evaluated apparent activation energy by applying the constitutive equation of pressure solution creep to the temperature-dependent relations. The activation energy of each deformation type was estimated as 18 kJ mol− 1 for shear-dominated and 45 kJ mol− 1 for co-axial-dominated shale. The energies enable us to speculate rate-limiting processes of pressure solution i.e. dissolution, diffusion and precipitation, by comparing the energies obtained in this study with energies had been measured by experiments. The lower activation energy estimated here was similar with that of diffusion. The similarity indicates that possible rate-limiting process of shale deformation in shallow subduction zone would be diffusion. The difference of energy between deformation types can be explained by distinctive grain boundary structure.

Document Type: Article
Keywords: pressure solution; activation energy; rate-limiting process; shale; accretionary complex
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.epsl.2009.07.032
ISSN: 0012-821X
Date Deposited: 15 Dec 2009 11:15
Last Modified: 09 Feb 2017 09:38
URI: http://oceanrep.geomar.de/id/eprint/7851

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