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Semibrittle deformation of granite at upper crustal conditions

Author
Bauer, S. J.
Published
United States : [publisher not identified], 1984
Springfield, Va.: National Technical Information Service, [approximately 1984]
Physical Description
microfiche : negative ; 11 x 15 cm

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Summary
This work addresses semibrittle deformation of rock, characteristic of high temperature and low pressure environments, which is by definition multimechanistic and therefore probably multi-rheologic. To enhance the understanding of this deformation regime the results are presented on: (1) finite element models which simulate polyphase aggregate deformation, (2) deformation experiments appropriate to the above environmental conditions, and (3) detailed observations of (2). The deformation is multimechanistic with microfracturing of apparent extensile and shear origin, glide in quartz and biotite, microfracture healing, dissolution, mineral alteration, incipient and partial melt, the mechanisms observed and evaluated as functions of temperature and strain. I attempted to partition the bulk specimen deformation into that contributed by the individual mineral species in the analysis. The systematic change in micromechanisms observed with increasing temperature is compatible with the origin of the gradational succession of macroscopic deformation modes from a single narrow fault (T/Tm less than or equal to .5) to a shear zone (T/Tm approx. = .6), to multiple shear fractures (T/Tm approx. = .75), to uniform flow (T/Tm greater than or equal to .9). 49 figs., 4 tabs.
Report Numbers
DE86006920; DOE/ER/10361-T7
Other Subject(s)
Collection
NTIS collection.
Note
DOE contract number: AS05-79ER10361
OSTI Identifier 6030301
Research organization: Texas A and M Univ., College Station (USA).
View MARC record | catkey: 47362198