 |
| Titel |
Aseismic creep of mafic fault rocks - an experimental study on the mechanical behaviour of deep-seated faults |
| VerfasserIn |
Sina Marti, Renée Heilbronner, Holger Stünitz |
| Konferenz |
EGU General Assembly 2014
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250093406
|
| Publikation (Nr.) |
 EGU/EGU2014-8093.pdf |
|
|
|
|
|
| Zusammenfassung |
| In order to gain more information about the mechanical behaviour of fault zones at deeper
crustal levels, we performed experiments on gouge material with a mafic composition at
different confining pressures (Pc), temperatures (T) and aseismic but ‘fast’ displacement
rates. Shear-experiments are performed on a tri-axial Griggs-type deformation apparatus with
solid confining medium, at Pc = 0.5 GPa and 1 GPa, T between 300°C and 700°C and at
constant displacement rates of 10-8 ms-1 and 10-7 ms-1. To simulate the fault
gouge we use a natural diabase (composed of ~ 57% Plagioclase, 41% Pyroxene,
2% accessories), crushed and sieved to a grain size of 500°C, abundant pore trails and the growth of fibres indicate that solution mass transfer
processes are taking place.
The deformation mechanism within the SLZs is not yet understood. Flow-structures
within SLZs could indicate a viscous deformation mechanism, which would also explain the
negative T dependence of the fault rock strength. |
|
|
|
|
|
|