By Korzhinsky and Schrienemakers, methods, phase relations of Mn-Al-Ca-silicates and other minerals in highly oxidized quartzites and schists of blueschist type metamorphism have been discussed. Because, such rocks were extensively studied in central Shikoku of Japan and in Andros and Evvia islands of Greece, they have been considered as thermodynamic system for discussion. The system contains ...

Metapelitic rocks in the Gasht area include micaschist, kyanite schist, andalusite schist, garnet schist, staurolite schist, cordierite schist and sillimanite schist. Tourmaline occurs as accessory mineral in all of these rock types. These schists are metamorphosed regionally and are affected by contact metamorpism subsequently. Based on the textural relations and the fact that CaO and TiO2 con...

The Otele, Matomb and Nguibassal localities correspond to the SW part of Yaounde Group. Field observations, rocks stream sediments study area were examined using rock tin sections, granulometric, morphoscopic X-ray fluorescence analysis identify their distribution, nature basement, provenance useful minerals some weathering process that affect them show exploration significance of these o...

The structural and thermal relaxation overprint associated with the Neogene Alboran rifting have obscured early Alpine tectono-metamorphic evolution of Domain, representing metamorphic core Betic–Rif orogen western Mediterranean region. This study focuses on Beni Mzala unit, forming lower deeper level nappe stack (Upper Sebtides) in Moroccan Rif. Meso- micro-scale investigations are carried out...

Abstract In collision-type orogens, where high-pressure and ultrahigh-pressure (HP–UHP) metamorphism usually occurs, deeply subducted continental slabs with eclogitized mafic rocks often undergo recrystallization/overprinting various geothermal gradients after the peak conditions at lower-to-middle-crustal levels. During crustal stabilization, transition from eclogite-to granulite-facies is com...

soursat metamorphic complex (smc) in west of takab city is one of the polyphase metamorphic terrenes in northern sanandaj-sirjan metamorphic belt of iran. the smc composed mainly of metasedimentary rocks associated with granitic intrusions. based on metamorphic rocks, two metamorphic phases could be separate in the complex. m1 is representative of regional metamorphisms which varies from greens...

Abstract We performed phase equilibrium experiments on a natural Ca-poor pelite at 3 GPa, 750–1000°C, under moderately oxidizing conditions, simulating the partial melting of such lithologies in subduction zones. Experiments investigated effect sulphur addition equilibria and compositions, with S contents up to ∼ 2.2 wt. %. Run products were characterized for their major trace element contents,...

Abstract Devolatilization of subducting lithologies liberates COH-fluids. These may become partially sequestered in peridotites the slab and overlying forearc mantle, affecting cycling volatiles fluid mobile elements subduction zones. Here we assess magnitudes, timescales mechanism channelized injection COH-fluids doped with $${\mathrm{Ca}}_{\mathrm{aq}}^{2+}$$ <mml:math xmlns:mml="http://www.w...

Abstract Granulites from Holsnøy (Bergen Arcs, Norway) maintained a metastable state until fluid infiltration triggered the kinetically delayed eclogitization. Interconnected hydrous eclogite-facies shear zones are surrounded by unreacted granulites. Macroscopically, granulite–eclogite interface is sharp and there no significant compositional changes in bulk chemistry, indicating composition wa...