Abstract Garnet–kyanite–staurolite assemblages with large, late porphyroblasts of amphibole form garbenschists in Ordovician volcaniclastic rocks lying immediately south the Pearya terrane on northernmost Ellesmere Island, Canada. The schist, which together carbonate olistoliths makes up Petersen Bay Assemblage (PBA), displays a series parallel isograds that mark an increase metamorphic grade o...

dehsalm metamorphic complex located in east of iran consists of regionally metamorphosed rocks intruded by three phases of granitic masses. synkinematic porphyroblasts of garnet from staurolite-garnet schist present well preserved growth zoning. electron microprobe analysis of selected garnets was carried out to interpret the origin and pattern of zoning in amphibolite facies garnets and its im...

The pegmatites of the São João del Rei Pegmatitic Province are related to Siderian protoliths Cassiterita and Resende Costa orthogneisses Ritápolis metagranitoid Ryacian age. Chemical analysis garnet from twelve reveal two different types grains, which were found in same pegmatitic body six these samples. One type has almandine-spessartine composition (Sps11-7-58.8 Alm36.8-86.5 Prp0.1-4.1Grs0.0...

Abstract It is well known that some garnet compositions can incorporate hydrogen and/or fluorine at levels up to several wt%. However, accurate measurement of these elements be difficult trace minor concentration levels, so they are frequently ignored in routine chemical analysis. Furthermore, the mechanisms H incorporation still under debate, and only one mechanism for F substitution commonly ...

The Xihuashan granitic complex (southern China) is mainly composed of coarse-grained porphyritic biotite granite (G–a), medium-grained porphyritic biotite granite (G–b), and mediumto fine-grained porphyritic biotite granite (G–c). The G–a granite is characterized by monazite-(Ce) and xenotime-(Y), in addition to commonly observed zircon and uranoan thorite. In the G–b and G–c intrusive units, m...

Abstract All available volume and elasticity data for the garnet end-members grossular, pyrope, almandine spessartine have been re-evaluated both internal consistency with experimentally measured heat capacities. The consistent were then used to determine parameters of third-order Birch–Murnaghan EoS describe isothermal compression at 298 K a Mie–Grüneisen–Debye thermal-pressure PVT behaviour. ...

The distribution coefficient KD=(Mg / Fe)garnet/(Mg/Fe)biotite has been calculated for eight garnet-biotite pairs from rocks ranging from the garnet isograd to the staurolite zone along the Stonehaven coast of NE Scotland. This distribution coefficient depends upon metamorphic temperature and is not dependent upon the Mn and Ca content of garnet. Garnet-biotite geothermometer yields temperature...

Almandine-spessartine garnets, from the Oxford County pegmatites and Palermo No. 1 pegmatite, record significant compositional variations according to degree of evolution their hosting rock. Garnets most fractionated (Mt. Mica, Berry-Havey, Emmons) show highest Mn, Nb, Ta, Zr, Hf values, followed by those intermediate grade (Palermo 1) and, finally, garnets barren lowest values (Perham Stop-35)...

Abstract Multicoloured tourmalines from Elba Island, commonly display dark-coloured terminations due to incorporation of Fe, and also occasionally Mn. The mechanisms which led the availability these elements in late-stage residual fluids are not yet completely understood. For this purpose, we investigated a representative tourmaline crystal found naturally two fragments within wide miarolitic c...