نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه زمینشناسی، دانشکده علوم پایه، دانشگاه لرستان، خرم آباد، ایران
2 موسسه زمینشناسی و زمینفیزیک، انجمن علوم چین
3 گروه زمینشناسی، دانشکده علوم، دانشگاه زنجان، زنجان، ایران
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
The studied amphibolites are located in Hashtbandi Village, east of Minab. The Makran amphibolites form as a part of the metamorphic rocks of northern Makran ophiolitic belt, which are found in massive and orientated forms. Based on the indicator minerals, these rocks are amphibolite, epidote-garnet amphibolite and garnet-pyroxene amphibolite. Their main minerals include amphibole, garnet, plagioclase, pyroxene, epidote, quartz and sphene. Based on mineral chemistry, clinopyroxene in the epidote-garnet amphibolite and garnet-pyroxene amphibolite is calcic type and mostly in the diopside range. The studied pyroxenes are mostly magmatic and enriched in Si and are placed in the context of sub-alkaline rocks (tholeiitic and calc-alkaline). These clinopyroxenes are related to volcanic arc and based on the temperature-pressure calculations of pyroxenes, the temperature ranges between 1070 to 1130 C and the pressure is 5 to 10 kbar, which indicates the crystallization of these minerals have taken place at high temperature and medium-high pressure. Also, based on the amount of ferric ion in clinopyroxenes, they formed in the low oxygen fugacity environment.
کلیدواژهها [English]