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| Titel |
In-situ observations of fluid inclusion - grain boundary interaction in recrystallizing rock analogue camphor |
| VerfasserIn |
J. Schmatz, J. L. Urai |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250025412
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| Zusammenfassung |
| Fluid inclusions in mineral grains or at grain boundaries provide fundamental information to
help reconstructing the conditions of basin formation and metamorphism. The mobility of
fluid inclusions and fluid-rock interaction helps us to characterize the effect of the pore fluid
on i) the mechanical properties of the rock and ii) the transport of fluid through a rock
volume. We performed see-through deformation experiments on the rock analogue camphor
in the presence of the fluid phase ethanol to characterize the in-situ pore fluid morphology
during static and dynamic grain boundary migration recrystallization. The polycrystalline
material was deformed at high homologous temperatures (Th - 0.7) and strain rates of
2 Ã 10-6 to 5 Ã 10-5s-1. For grain boundary migration rates ranging from 10-11 to
10-6ms-1 we observed Zener pinning, the drag and drop of fluid inclusions by migrating
grain boundaries but also some instances in which the fluid phase was not affected by
moving grain boundaries. We mapped the drag limiting migration rates for the present
model materials, which are three times lower for annealing than for dislocation
density driven recrystallization. We present a detailed description of fluid inclusion -
grain boundary interactions with respect to fluid inclusion size and grain boundary
migration rates. The description of the formation of isolated fluid inclusions and fluid
inclusion arrays with respect to the fluid inclusion morphology supports established
theories on diffusive material transport and surface tension driven instability of fluid
inclusions. |
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