نوع مقاله : مقاله پژوهشی
نویسنده
گروه زمینشناسی، دانشگاه پیام نور، تهران، ایران
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسنده [English]
The study of granitoides bodeis in the west of Taft, is located in the middle part of the central Iran, indicates the presence of quartz, orthoclase, plagioclase minerals as main minerals and amphibole, biotite, sphene, zircon and apatite as secondary minerals. In these rocks, medium-grained to fine-grained, granophyric and myrmikite textures are observed. The data of mineral chemistry analysis show that calcic type amphiboles of magnesiohornblende to actinolite nature belonging to temperature 659-891 C, pressure 2.1- 4.9, and depth 4.4- 6 have been crystallized. However, feldspars are oligoclase to andesine type that belonging to 700-800 C, and biotites have been crystallized 700-750 C. The minerals chemistry of biotite was indicated to the mantle nature of the magma, which has suffered from moderate to severe crustal contamination during ascent. The mineral chemistry of chlorite refers to the involvement of alteration processes and the formation of this mineral at the temperature of 330 to 360 C. All of the data indicates to the calc-alkaline granitoides I type, which were formed in the structural zone of subduction and in connection with the active continental margin
کلیدواژهها [English]