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Vol. 23, No. 3, Fall 1394/2015
Approach on the characteristics of basic magma rocks sarkoobeh
(north Khomein) by clinopyroxene mineral chemistry
Z. Sakhaei 1, N. Shabanian1, A.R. Davoudian1, M. Paydari2
1.Faculty of Natural Resources and Earth Sciences, Shahrekord University, Shahrekord, Iran
2.Payam Noor University, Golpaygan. Iran
(Received:14/9/2014, in revised form: 24/12/2014)
Abstract: Gabbroic rocks of Sarkobeh region are exposed as several intrusive bodies with a
post-cretaceous age in north of Khomein city, Northern Sanandaj-Sirjan Zone. These igneous
rocks are intruded in shale and limestone units which belong to cretaceous age. Main minerals
forming the rocks are clinopyroxene, plagioclase and opaque. Microprobe analyses on the
clinopyroxenes of the gabbros show a diopside composition with no chemical zoning. On the
basis of geothermometry, crystallization-temperature yielded minimum temperatures of 550–
700 ºC and crystallization-pressure is less than 5 kbar for the diopsides. AlVI/AlIV ratio is lower
than 0.25 indicating a low pressure condition for gabbroic magma in the studied area. The
clinopyroxenes composition show that they have crystallized from an alkaline basic magma.
They plot in the within-plate alkalic basalt filed tectonomagmaticlly.
Keywords: Mineral chemistry, Clinopyroxene, Tectonomagmatic, Sarkoobeh, Khomein,
Sanandaj – Sirjan.
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Corresponding author, Tel-fax: 09136483935, 03832324423, Email:[email protected]
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