Chromitites associated with strongly altered peridotite from six distinct localities in the Santa Elena ultramafic nappe (Costa Rica) have been investigated for the first time. Santa Elena chromitites commonly display a compositional variation from extremely chromiferous (Cr/(Cr+Al)=0.81) to intermediate and aluminous (Cr/(Cr+Al)=0.54). This composition varies along a continuous trend, correspo...

Serpentinite-hosted massive magnetite ore bodies are reported for the first time in Late Cretaceous Sabzevar ophiolitic belt, northeastern Iran. They show irregular and discontinuous shapes with variable sizes ranging from 30 to 60 cm. Chromian spinel grains observed within both ores host serpentinite. Magmatic chromian spinels, (Cr,Al)-spinel I, compositions close (Mg0.6,Fe0.4)(Cr1.2,Al0.75,Fe...

recently full factorial design approach has been used to assess the recycling potential of a given waste. the objective of this study is to identify the significant factors and interactions involved in maximizing compressive strength of concrete when chromium waste is used as admixture. in this respect, experimental factors at two levels, which are admixture type (chromite/ chromite+ superplas...

The irregular and sporadic occurrence of chromite pods in podiform deposits (PCD), especially mountainous terranes with rough topography, necessitates finding innovative methods for reconnaissance prospecting. This research combines several remote sensing to discriminate the highly serpentinized peridotites hosting from other barren ultramafic mafic cumulates. case study is area Sabzevar Ophiol...

Introduction: Primitive achondrites (IAB irons/winonaites; acapulcoites/lodranites; and brachinites) have chondritic compositions, but nonchondritic textures (from metamorphic through partially melted) [1]. Because of this, they offer a unique insight into the first stages of the differentiation process on asteroids. Acapulcoites and lodranites have textural and mineralogical evidence that they...

The presence of PGM associated with the podiform chromitites in Jurassic–Cretaceous ophiolite Sebuku Island (South Kalimantan, Indonesia) is reported for first time. Two types chromitite have been recognized; one high-Cr composition (Cr/(Cr + Al) > 0.7) occurs deep mantle, other, high-Al < 0.6), located close to Moho transition zone. TiO2-Al2O3 relations indicate affinity IAT and MORB, ch...

the subduction of the northern part of the tethys is documented by arc magmatism from upper triassic to lower eocene crosscutting the sanandaj-sirjan zone and from upper eocene to plio-quaternary in the urumieh-dokhtar magmatic zone, situated north of the ssz. neyriz ophiolite is part of middle eatern neo-tethyan ocean of mesozoic that geographically is related to ophiolites of nw-se iran, alon...