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.
Highlights
Central Iran is one of the main and most complex geological zones of Iran (Figure 1)
Plagioclases Plagioclase (PLAG) is largely unaltered in rocks from this site and shows a distinct difference in habit related to the type of occurrence and the magmatic affinity of the host lava
PLAG plotting in the ternary classification diagram Ab-An-Or (Figure 2) shows that there may be some overlap between phenocrysts of each magma compositions
Summary
Central Iran is one of the main and most complex geological zones of Iran (Figure 1). As a result of Neo-Tethys subduction beneath the Central Iran Microplate (CIM) and following the collision of Iranian and Afro-Arabian plates, various structural zones developed in Iran (Alavi, 2004, Nadimi, 2007, Sengör and Yilmaz, 1981 and Ahmadzadeh, Jahangiri, Lentz and Mojtahedi, 2010) [2]-[5]. Peak of this subduction-related calc-alkaline magmatic activity is thought to have been in the Eocene age (Stocklin, 1973, Farhoudi, 1978, Emami, 1981, Jahangiri, 2007, Berberian and King, 1981, Dupuy and Dostal, 1984, Azizi and Jahangiri, 2008, Jung, Küsten and Tarkian, M., 1976) [6]-[13]. Longitudes of 54 ̊30' and 54 ̊45' and latitudes of 35 ̊15' and 35 ̊30' (Figure 1) are part of Troud 1:250000 scale map of Central Iran micro plate
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