Abstract
In this paper, tectonic and geothermobarometric environments have been studied with respect to the combination of pyroxene, olivine and plagioclase in volcanic rocks in the southeast of Bam. The combination of volcanic rocks in the region consists of olivine basalt, basalt, alkaline basalt, andesite, trachyandesite and pyroxene andesite. This combination is the result of the processes of crystallization and sometimes contamination. Plagioclase, clinopyroxene, olivine, and amphibole constitute the major minerals (rock forming minerals) in these rocks. Porphyritic to mega-porphyritic textures with microlithic, glumero-porphyritic and amigdaluidal matrix are observed. Based on the thermometric calculations, plagioclase, pyroxene, and olivine minerals and the rocks of this region are crystallized at a pressure of 1.5 to 7 kb and temperatures ranging from about 700°C to 1250°C.
Highlights
The investigated area in 120 km southeast of Bam covering a region of approximately 800 km2 is situated between 28 ̊03'E - 28 ̊24'E and 58 ̊49'N - 59 ̊00'N
Tectonic and geothermobarometric environments have been studied with respect to the combination of pyroxene, olivine and plagioclase in volcanic rocks in the southeast of Bam
The combination of volcanic rocks in the region consists of olivine basalt, basalt, alkaline basalt, andesite, trachyandesite and pyroxene andesite
Summary
The investigated area in 120 km southeast of Bam covering a region of approximately 800 km is situated between 28 ̊03'E - 28 ̊24'E and 58 ̊49'N - 59 ̊00'N. The study area is, structurally, located in the southern sector of the De-. Two types of tectono-magmatic models are proposed for the Urmieh-Dokhtarvolcanic zone, namely, subduction of the neo-tethys oceanic crust beneath the central Iranian continental crust from cretaceous to tertiary [1] [2] [3] [4] and/or intermittent opening and closing of intra-continental rifts [5] [6]. Sampling and microscopic studies on the volcanic rocks were carried out after the field studies, in this research. After that and given the composition of the volcanic rocks, minerals including plagioclase, clinopyroxene and olivine were used in determination of the origin, pressure and temperature of magma
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