Eclogites formed during the Eo-alpine metamorphic event are common within the ophiolitic unit of the Mulhacén complex, which forms part of the Betic Cordillera in southeastern Spain. A detailed study with cathodoluminescence (CL) images of zircon from these eclogites has revealed three types of domains, confirmed by some differences in their REE patterns and ages. There are a) igneous domains, ...

The garnet amphibolites, from the Akom II area in Archaean Congo Craton, were examined to determine geochemical affinity and tectonic environment. study uses mineral assemblages whole-rock geochemistry identify setting of amphibolites associated with monzogabbro pyroxenites. studied rocks are amphibolites. Mineralogically, contain hornblende + plagioclase ± quartz epidote apatite opaque, indic...

Abstract Subduction megathrusts exhibit a range of slip behaviors spanning from large earthquakes to aseismic creep, yet what controls spatial variations in the dominant mechanism remains unresolved. We present multichannel seismic images that reveal correlation between lithologic homogeneity megathrust and its behavior at subduction zone is world renowned for lateral transition, Hikurangi marg...

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Almandine-rich garnets from a Neogene andesite of Slovakia can be divided into two main types. Garnet megacrysts are magmatic and form chemically homogeneous group that contains, on average, about 5 wt% CaO 4.5 MgO as petrogenetically significant components. Garnets occurring in lithic fragments aggregated garnetite lenses characterised by Ca-poor cores (CaO <= 2 wt%) testify for two-step hi...

Abstract Important fault zone processes can be discerned from the characterization of fracture damage and chemical transformations associated with active seismic sources. To characterize 2010 M7.2?El Mayor-Cucapah rupture zone, continuous samples core 23 damaged rock were collected perpendicular to strike Borrego fault. Samples analyzed for clay mineralogy, bulk geochemistry, grain density whic...

Abstract. An eclogite-facies orthogneiss and host paragneiss from a quarry near Tavagnasco in the Lower Aosta Valley were studied order to refine protolith, provenance metamorphic ages of Eclogitic Micaschist Complex Sesia Zone. The contains jadeite with quartz + phengite K-feldspar ± garnet rutile zircon, whereas hosts glaucophane epidote quartz. Phase diagram modeling two representative sampl...

INTRODUCTION The redox state of sillimanite zone (650–700°C, 5–6 kbar) metasediments of the Barrovian type area, Scotland, was investigated The chemical and mineralogical evolution of the crust using estimates of metamorphic oxygen fugacity (fO2 ), sulfur fugacity during orogenesis is critically dependent upon the redox (fS2 ), and fluid chemistry based on new determinations of mineral state of...