نتایج جستجو برای: calc

تعداد نتایج: 1117  

2013
arol D. Frost Ronald Frost

The Proterozoic eon is characterized by an unusual abundance of ferroan feldspathic rocks that range in composition from granite to quartz syenites to feldspathoid-bearing syenites. Three associations of ferroan rocks may be recognized on the basis of major element compositions: (1) metaluminous alkalic to alkali-calcic syenites and granites associated with anorthosites and iron-rich basaltic r...

Journal: :The Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists 1981

Journal: :Earth and Environmental Science Transactions of the Royal Society of Edinburgh 2016

Journal: :journal of tethys 0

salafchegan-khorhe volcanic rocks are exposed within urumieh-dokhtar magmatic belt. different kinds of volcanic and subvolcanic rocks of calc-alkaline to alkaline character have been reported throughout this magmatic belt. since, isotopic investigations are very useful for detection of magma petrogenesis and because no isotopic studies have been done in this area, so a geochemical and isotopic ...

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