Abstract Titanite U–Pb geochronology is a promising tool to date high-temperature tectonic processes, but the extent and mechanisms by which recrystallization resets titanite dates are poorly understood. This study combines dates, trace elements, zoning, microstructures directly deformation fluid-driven along Coast shear zone (BC, Canada). Twenty grains from deformed calc-silicate gneiss yield ...

Rutile titania powders were synthesized via a sol-gel/hydrothermal process using nitric acid as the catalyst. A molar acid to alkoxide ratio of 10 and a water to alkoxide molar ratio of 250 produced 100% rutile powders when precipitated below 45 °C. Higher temperatures yielded initially either anatase or mixtures of anatase and rutile. Spherulitic growth produced cauliflower-shaped agglomerates...

Replacement reactions ('pseudomorphism') commonly occur in Nature under a large range of conditions (T 25 to >600 degrees C; P 1 to >5 kbar). Whilst mineral replacement reactions are often assumed to proceed by solid-state diffusion of the metal ions through the mineral, many actually proceed via a coupled dissolution and reprecipitation (CDR) mechanism. In such cases, a starting mineral is dis...

The ideal geochronometer would be a universally stable phase that quantitatively retains both parent and daughter isotopes. Though a few mineral systems such as zircon U-Pb dating come reasonably close to this ideal, most minerals are incompletely retentive of daughterproduct nuclides under crustal conditions. The mechanisms by which the daughter product can be lost from minerals include dissol...

• Interfacial energies calculated for calcite with water and ACC. Predictions made dissolution+re-precipitation vs solid state transformation. Discussion of use in classical nucleation theory. The interfaces water, dehydrated hydrated amorphous calcium carbonate are studied molecular dynamics simulations. interfacial demonstrate that the interface is most stable when contact or low concentratio...

The effects of dissolution the η′ phase by solution treatment on mechanical properties A7075-T6 alloy were investigated. Immediately after T6 sheet at 450 oC or higher, elongation significantly increased and occurred. is main hardening phase. After natural-aging, GPI, which coherent with aluminum matrix, was formed strength increased. When bake natural-aging performed, yield slightly due to par...