نتایج جستجو برای: clinopyroxene
تعداد نتایج: 784 فیلتر نتایج به سال:
METEORITE: SINGLE-CRYSTAL XRD, ELECTRON MICROPROBE AND MÖSSBAUER ANALYSES OF CLINOPYROXENE. M.C. Domeneghetti, A.M. Fioretti, F. Camara, G. Molin , C. McCammon . 1 Dipartimento di Scienze della Terra, Università di Pavia,Via Ferrata 1, 27100-Pavia, Italy, ([email protected]), CNR – IGG, Corso Garibaldi 37, 35137-Padova, Italy, 3 CNR – IGG, Via Ferrata 1, 27100-Pavia, Italy, 4 Dipart...
The study area is located in northwest of Birjand, northern part of the Sistan suture zone in eastern Iran. There is well preserved outcrops of an ophiolite mélange in this area. This complex is composed of harzburgite, layered gabbro and spilitic basalt with flysch type rocks. Microprobe analyses of olivine, clinopyroxene, orthopyroxene and spinel in harzburgites show that olivine is forsterit...
Introduction: It is well known that shergottites have a large variation of rare earth elements (REEs) abundance patterns and isotopic compositions. Jones [1] and Borg and Draper [2] suggest that light REEs (LREEs)-enriched shergottites resulted from mixing of a LREEs-enriched component with their parental magma. The LREEsenriched component is thought to be either Martian crust [1] or a KREEP-li...
Petrography and chemistry of minerals showing that Eocene alkaline volcanic rocks in southwestern of Germi (Talesh zone, NW Iran) mostly have basaltic composition. Mineralogically these rocks are composed of diopsidic clinopyroxene and labradoritic plagioclase phenocrysts. The microlithic and glassy groundmass composed of sanidine, clinopyroxene, biotite, pargasitic amphibole and magnetite asso...
Nature and cause of compositional variation among the alkalic cap lavas of Mauna Kea Volcano, Hawaii
Most Hawaiian basaltic shield volcanoes are capped by moderately to strongly evolved alkalic lavas (MgO < 4.5 wt. %). On M auna Kea Volcano the cap is dominantly composed of hawaiite with minor mugearite. Although these lavas contain dunite and gabbroic xenoliths, they are nearly aphyric with rare olivine and plagioclase phenocrysts and xenocrysts. The hawaiites are nearly homogeneous in radiog...
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