Abstract
Metabasite refers to metamorphosed basalts and other mafic igneous rocks (rich in iron and magnesium). When a mafic igneous rock is subjected to new pressure and temperature conditions during metamorphism, these chemical components will rearrange themselves to form new minerals. Metabasites can be found in many metamorphic belts including Sanandaj-Sirjan metamorphic belt of Iran. The study area is a Tanbour metamorphic complex in Eastern of Sirjan city, which is geologically located at the Sanandaj-Sirjan metamorphic belt in Southern Iran. Metabasite in this complex consists of greenschist, epidote amphibolite and amphibolite. Amphibole and plagioclase are the main minerals in the greenschist and amphibolite, and the a secondary mineral in some micaschist seen in the study area. The electron microprobe analysis was done on this mineralization in greenschist, epidote amphibolite and amphibolite, which showed that the amphiboles in greenschist was a member of the calcic group and Actinolite type, and the amphiboles in epidote amphibolite was a member of the calcic group and these amphiboles were tschermakite up to Ferro-Tschermakite + Ferro-Hornblende type. The amphibole in amphibolite is a member of the calcic group and this amphibole is Magnesio-Hornblende type. The plagioclases in the greenschist is pure albite (An 3.29 - 3.6), and in the epidote amphibolite is oligoclase (An 19.5 - 24.2), while in the amphibolites is oligoclase (An 16.9 - 26.6). The estimated P–T conditions are in favor of their metamorphism under epidote amphibolite (550°C and 8 kbar) and amphibolite (611°C - 652° Cand 10.5 kbar) facies.
Highlights
Metabasite are important metamorphic rocks which are sensitive to the condition of metamorphism and can be used to estimate the pressure and temperature of metamorphism
Amphibole and plagioclase are the main minerals in the greenschist and amphibolite, and the secondary mineral in some micaschist seen in the area
22.996 the amphiboles in greenschist is a member of the calcic group and Based on the Mg/(Mg + Fe2+) on TSi diagram (Figure 12) shows the amphiboles in greenschist are of actinolite type
Summary
Metabasite are important metamorphic rocks which are sensitive to the condition of metamorphism and can be used to estimate the pressure and temperature of metamorphism. Which Fe-Mg-Ca-bearing silicates form depends on the specific pressure and temperature conditions, and so by identifying the minerals within a metabasite you can determine the approximate conditions under which the basalt or gabbro is metamorphosed. The study area is a Tanbor metamorphic complex in eastern of Sirjan city, which is geologically located at the Sanandaj-Sirjan Metamorphic belt in southern Iran. Metabasite in this complex consists of greenschist, epidote amphibolite and amphibolite. This paper is based on mineral chemistry studies specifying the type of amphibole in metabasites
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