Read the full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=49652 DOI: 10.4236/ojg.2014.49033 Author(s) Elham Shah Hosseini, Afshin Ashja Ardalan, Mohammad Hashem Emami, Mohammad Hossein Razavi Affiliation(s) Department of Geology, North Tehran branch, Islamic Azad University, Tehran, Iran. Department of Geology, North Tehran Branch, Islamic Azad University, Tehran, Iran. Department of Geology, Eslamshahr Branch, Islamic Azad University, Eslamshahr, Iran. Department of Geology, Faculty of Sciences, Kharazmi University, Tehran, Iran. ABSTRACT This paper elucidates the compositional studies on clinopyroxene, plagioclase of basalts to andesitic rocks of Torud area to understand the geotectonic and geothermobarometry conditions. Early Eocene-Oligocene calc-alkaline volcanic rocks are exposed around Torud in the Central Iranian zone. Volcanic rocks consist of basaltic, andesite basalt, Tracyandesite, and andesite. Minerals in the volcanic rocks exhibit degrees of disequilibrium features. Plagioclase as dominant mineral in these rocks generally displays oscillatory zoning. Mineral chemistry studies show that clinopyroxenes in the volcanic rocks are diopside, augite and plotted in medium pressure field. The clinopyroxene composition yields the crystallization temperatures 900°C - 1000°C. The mineral composition indicates that these rocks are formed in a tensional environment. gjreww140916 KEYWORDS Volcanic Rocks, Mineral Chemistry, Clinopyroxenes, Plagioclase, Torud
