At low temperatures (<750 °C at moderate to high crustal pressures), the production of suffi cient melt to reach the melt connectivity transition (~7 vol%), enabling melt drainage, requires an infl ux of aqueous fl uid along structurally controlled pathways or recycling of fl uid via migration of melt and exsolution during crystallization. At higher temperatures, melting occurs by fl uid-absent...

A-type granitoids, either intruded into greenschist facies volcano-sedimentary sequence or emplaced at the contact between lowand high-grade terranes, constitute a significant proportion of the granitoid rocks in the Precambrian of western Ethiopia. These granitoids are characterized by Fe-rich biotite, ferro-hornblende, alkali-amphiboles, and alkali pyroxenes. High total alkalis, high FeOT/MgO...

We report geochemical data of apatites from Mesozoic granitoids in the northeastern North China Craton (NCC), and discuss relationship between apatite whole-rock compositions with aim using to constrain granitoid petrogenesis. Measured Sr contents Sr/Y ratios exhibit positive correlations those their host rocks, εNd(t) values display a strong linear εHf(t) zircons granitoids. In addition, simil...

chlorite flakes, as a product of alteration of biotite, the dominant ferromagnesian mineral in the paleozoic granitic rocks of the canadian appalachians, have been analyzed by electron microprobe for major elements and by 57fe m?ssbauer spectroscopy for the coordination and oxidation state of fe. comparison of m?ssbauer fe3+/fe ratios obtained from chlorite and its host biotite indicates that c...

Completely decomposed granite (CDG) soil is the most common type of soils found in more than 90% of the land area in Hong Kong. The measurement of the stress-strain-strength behaviour of the CDG soil is very important for deformation and stability analysis of slopes, retaining walls, excavations, deep and shallow foundations related to the CDG soil ground. As most of these geotechnical structur...

We explore the potential effects of magmatic assimilation on mineral growth and mineral zoning in an alkali olivine basaltic magma using both equilibrium thermodynamics and kinetics. The equilibrium-model calculations simulate fractional crystallization alone (closed system) and coupled assimilation fractional crystallization (AFC) (open system); the models predict the assemblages ofmagmatig mi...

The W–Sn Panasqueira ore deposit is a magmatic-hydrothermal system, which includes high-grade quartz-vein type mineralization and disseminated greisen-type occurring in the upper part of two-mica granite. We investigated genetic chronological relationships between greisenization granite formation ore-bearing quartz veins by monitoring major trace elements variations quartz-white mica assemblage...

This study exploited the contrasting major element chemistry of adjacent, physically separable crystals of framework and sheet silicates in a pegmatitic granite to investigate the mineralogical influences of fungal community structure on mineral surfaces. Large intact crystals of variably weathered muscovite, plagioclase, K-feldspar, and quartz were individually extracted, together with whole-r...