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Shahabi, Ghasemi, Rezai Kahkhai, Minggou. Petrography, whole-rock geochemistry and mineral chemistry of clinopyroxene and amphibole in basic alkaline igneous rocks of Shemshak Formation, S Azadshahr, Eastern Alborz. www.ijcm.ir 2021; 29 (1) :111-128
URL: http://ijcm.ir/article-1-1589-en.html
1- Faculty of Earth Sciences, Shahrood University of Technology, Shahrood, Iran
2- Institute of Geology and Geophysic, Chinese Academy of Science (IGGCAS), Beijing, China
Abstract:   (650 Views)
At the base of Shemshak Formation in the south Azadshahr area, some igneous mafic rocks are discovered recently  as olivine gabbro bodies and pegmatoid alkali-diorite dikes. Rock-forming minerals of olivine gabbro includes olivine, clinopyroxene and plagioclase, alkali-diorites are composed of large amphiboles and plagioclase. Major and trace elements characteristics of these rocks indicate they have alkaline nature and derived from OIB-like mantle source. Mineral chemistry of olivines and plagioclases in olivine gabbros determined as chrysolite and labradorite, respectively. Clinopyroxenes in olivine gabbros have diopsidic to augitic composition  and alkaline (Non-orogenic) affinity, and they formed in 2-11 Kbar, 1200-1250˚C and high oxygene fugasity conditions. Amphiboles in alkai-diorites are calcic and characterized with kaersutite to magnesiohastingsite in composition, igneous nature and derived from mantle sources. Their crystallization temperature and pressure are 950˚C and 600-750 MPa (equivalent 6-7/5 Kbar). Plagioclases in alkali-diorites are albite.
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