Petrography, Geochemistry and Tectonomagmatic Setting of the intrusive bodies of Jasb area
Subject Areas :
R. Mohammadi
1
(استادیار دانشگاه آزاد اسلامی، واحد آشتیان)
ناصر Ebadati
2
(استادیار دانشگاه آزاد اسلامی، واحد اسلامشهر)
Keywords: Petrography, Geochemistry, Jasb, Tectonomagmatic setting,
Abstract :
The Jasb area is located about 100 Km of South of Qom in Urmiyeh-Dokhtar magmatic belt. Thescattered plutonic rocks belong to Eocene-Oligocene and Miocene. The plutonic rocks’ typeVariations are granite, quartzmonzonite, tonalite-granodiorite ,quartzmicrodiorite, and gabbrodiorite.The petrographic studies revealed that the textures of plutonic rocks are mainly granular andsometimes graphic or porphyritic. The magmatic series of intrusive rocks except gabbrodiorite types(toleitic) are calk alkaline and metaaluminums. Probably, the small massive granite rocks in theinvestigation area are I - type granite. The Rocks in this area compositionally belong to the tectonicalregime of the VAG and SynCOLG. Considering change in abundance of minerals such as pyroxene,magnetite, amphibole, biotite, plagioclase and feldspar in the intrusive rocks, hence, it is indicative ofsuccessive process of differentiation in intermediate magma, and ultimately creating variation inlithology. According to the analysis results, the geochemical diagrams were drawn and interpreted.Defining the lithology of intrusives, the tectonomagmatic condition, magmatic series, and geochemicalvariations are the results of geochemical and petrologic studies of intrusives in the area.
