نتایج جستجو برای: clinopyroxene
تعداد نتایج: 784 فیلتر نتایج به سال:
Scandium is an important industrial metal for which demand projected to increase in the future. Although many Sc deposits are secondary, scavenged by clinopyroxene during fractional crystallization of primary, mafic-ultramafic magmas. may thus occur sub-economic concentrations intrusions. In this work, we present new data on concentration Bushveld Complex (BC) South Africa. The eastern and west...
Clinopyroxene bearing spinel harzburgites recovered from Cenozoic alkaline basalts the Kapsiki plateau were investigated with aim of understanding depletion and enrichment processes in subcontinental mantle below a major tectonic line. Concentrations trace elements (including H) determined in-situ olivine, orthopyroxene, clinopyroxene by EPMA, LA-ICP-MS FTIR. The xenoliths are refractory high o...
Bora-Baricha-Tullu Moye is a Late Quaternary volcanic system in the Main Ethiopian Rift, characterised by products of both explosive and effusive eruptions. The petrological geochemical characteristics are investigated using combination petrography, major trace element whole rock analyses in-situ phenocryst phases, matrix glass melt inclusions. bulk compositions vary from basalt to peralkaline ...
To better understand the behaviors of calcium (Ca) isotopes during igneous and metamorphic processes that differentiate Earth other rocky planets, we investigated effects pressure Ca/Fe concentration on average CaO bond length reduced partition function ratio 44Ca/40Ca (103ln44/40Caβ) in garnet using first-principles calculations. Our calculations show (1) increases 103ln44/40Caβ decreasing (ap...
The Javaherdasht Basalts show compositional range from olivine basalts to quartz basaltic andesites. Petrographic studies indicate that the differentiation of clinopyroxene and olivine minerals has main role for lithologic variety of the basalts.The corosion golf, crenated margins and lack of the same colour in the clinopyroxene phenochrysts margins with matrix Pyroxene grains express a nonequi...
Fathabad area is located in northwest of the city of Zarand (Kerman province) in the Posht-e-Badam block of the central Iran structural zone. The Ordovician–Silurian gabbroic stocks have intruded into volcanic-sedimentary rocks of the Rizu series. The gabbros are mainly composed of clinopyroxene, kaersutite, plagioclase and biotite. Electron microprobe analyses demonstrate that the clinopyroxen...
Gabbroic pluton of Bagham is located in southeastern Ardestan and has intruded into Eocene volacanic rocks. The study area is a part of Central Iranian zone and Urumieh-Dokhtar magmatic belt. Clinopyroxene, plagioclase and amphibole are main minerals in the pluton. Mineral chemistry studies show that clinopyroxenes are augite and are plotted in almost medium pressure field. The clinopyroxene co...
The injection of I-type granitoid bodies (Hosh intrusion) with calc-alkaline affinity into Lower Cretaceous limestones (Taft Formation) has produced the various types of related skarns and marbles. Thereby, those skarns formed can be undoubtedly divided into four groups, clinopyroxene-plagioclase skarns, clinopyroxene skarns, clinopyroxene- vesuvianite skarns and moreover garnet skarns. Additio...
We present the results of phase equilibrium experiments carried out on basanite and phonotephrite lavas from Ross Island, Antarctica. Experiments were designed to reproduce the P–T–X–fO2 conditions of deep and intermediate magma storage and to place constraints on the differentiation of each of the two predominant lava suites on the island, which are thought to be derived from a common parent m...
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