نویسندگان
1 گروه آموزشی زمین شناسی، دانشکده علوم، دانشگاه بوعلی سینا، همدان، ایران
2 گروه زمین شناسی، دانشکده علوم پایه، دانشگاه بوعلی سینا، همدان، ایران.
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
The Baghcheghaz intrusive mass is exposed in Hamadan province and in the northeast of Famenin city in the Sanandaj zone of Sirjan. Based on petrographic and geochemical studies, the type of rock that forms the mass is gabbro. The results of geochemical analysis show that these rocks are related to calcalkaline and tholeiite magmatic series. The trends formed in the Harker diagrams and their geochemical continuity, the patterns of the spider diagrams and the parallelism of the trends of these diagrams and the existence of enrichment in K and Pb elements and depletion in Nb confirm the common origin of the samples and indicate the involvement of magma with the continental crust. The nature and chemical composition of rocks in the region have undergone magmatic processes such as fractional crystallization, partial melting, and contamination.The pattern of changes of normalized rare earth elements compared to chondrite and primary mantle show that the values of rare earth elements LREE are higher than heavy earth elements HREE. The graphs related to the minor elements show that the magma forming the igneous rocks of the Baghcheghaz intrusive mass originates from the mantle with the composition of spinel lherzolite and with a low to medium partial melting degree (5% to about 30%) and in a subduction environment and volcanic arcs are formed on the active continental margin.
کلیدواژهها [English]
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