Nahid Shabanian Boroujeni; Alireza Davoudian Dehkordi; Fatemeh Panahdar
Volume 3, Issue 11 , December 2012, , Pages 59-76
Abstract
The Ghareh Boltagh granitic pluton, as a part of the magmatic-metamorphic complex of the north of Boein Miandasht, exposed in the southeastern of Aligoodarz and located in Sanandaj-Sirjan ...
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The Ghareh Boltagh granitic pluton, as a part of the magmatic-metamorphic complex of the north of Boein Miandasht, exposed in the southeastern of Aligoodarz and located in Sanandaj-Sirjan zone. The complex consists of granite, diorite and gabbro with metabasite rocks. Mineralogically, the granitic rocks are mainly composed of major minerals of quartz, alkali feldspar, plagioclase, and minor minerals of biotite, amphibole, epidote, zircon, sphene, apatite, tourmaline, allanite and opaque. The Ghareh Boltagh granitic pluton consists of high SiO2 (68.74-72.59 wt. %), K2O (4.5-5.01 wt. %) and Na2O (3.75-4.23 wt. %), and Fe2O3tot (2.2-3.78 wt. %). It shows metaluminous to slightly peraluminous nature. On the base of chondrite-normalized REE diagram, all of the samples invariably show a relatively enrichment in LREES rather than HREES with negative Eu anomalies. Their primitive-mantle normalized spider diagrams display negative Ba, Sr, P and Ti anomalies. The calculated zirconium saturation temperatures range from 799 to 848 °C. The studied rocks, geochemically, belong to the A2-type granites, generated in a post-collisional tectonic setting.
