نتایج جستجو برای: gneiss
تعداد نتایج: 648 فیلتر نتایج به سال:
The study area is situated in the west of Soltan Abad prom NE Sabzevar (Razavi Khorasan province). There is an exposure of metamorphic complex that contains greenschist, blueschist, amphibolite and eclogite (?) facieses rocks. Gneissic body is located in the middle part of this complex (Koh-e-Chili). Protolith and foliation intensity are variable in this body. Field evidences, whole rock geoche...
Microscopic and XRD investigations indicate that the main mica is phlogopi!e. There are also a small amounl of Muscovi!e in Ihe eas! pan. Trend of mica layers is NE-SW. Host rocks arc Gneiss, mi::.;!schist S, granite and gabbro. Minerals assemblage of this mine is phlogopitc, apatite and calcite. Chemical and microscopical in vestiga tions of granite indicate that they are nonorogen alkal...
The core of detrital zircons from the southern Meiganga gold-bearing placers were analyzed by Laser Ablation Split Stream analytical techniques to determine their trace element abundances and U-Pb ages. obtained data used characterize each grain, its formation condition, try provenance. Hf (5980 12,010 ppm), Y (27–1650 U (25–954 Th (8–674 Ti (2–256 Ta, Nb, Sr (mainly <5 Th/U (0.06–2.35), zir...
Abstract To characterize the integrated magmatic processes for magma plumbing systems from mantle sources to chambers, we present Mg–Sr–Nd isotopic data a representative mafic–ultramafic intrusion in Xiarihamu, northern Tibetan Plateau, China. The hosts largest Ni–Cu sulfide deposit an orogenic setting world and is composed predominantly of harzburgite, orthopyroxenite, websterite, gabbronorite...
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