University of Isfahan Petrological Journal 2228-5210 6 23 2015 09 23 Mineral chemistry and genesis determination of tourmalines from the granite-gneiss pluton in the northeast of Jan mine (Lorestan province( Mineral chemistry and genesis determination of tourmalines from the granite-gneiss pluton in the northeast of Jan mine (Lorestan province( 65 82 16223 FA Arezoo Moradi Faculty of Natural Resources and Earth Sciences, Shahrekord University, Shahrekord, Iran Alireza Davoudian Dehkordi Nahid Shabanian Boroujeni شهرکرد- دروازه سامان- دانشگاه شهرکرد-دانشکده منابع طبیعی و علوم زمین Journal Article 2016 06 14 The outcrop of mylonitic granite-gneiss in the northwest of Azna city and the northeast of the Jan building stone mine is a part of Sanandaj-Sirjan zone. The tourmalines from these rocks are black and patchy or fine association. Based on EPMA data the tourmalines studied are shorl-dravite in composition with more tendency towards shorl. They belong to granitic environment and precipitated during hydrothermal condition. The chemical composition of the host granite is a major factor in distribution of elements in the studied tourmaline structural framework during the process of differentiation, as well as, faulting and uplifting of granitoid body. Some of the dominant substitution mechanisms in the structure of the investigated tourmalines are as follow: □X Al (Na R2+)-1, 21 xNa-1 zAl-1+xCa1 YR (OH)-1, Fe2+ Fe3+) (Mg Al)-1. The outcrop of mylonitic granite-gneiss in the northwest of Azna city and the northeast of the Jan building stone mine is a part of Sanandaj-Sirjan zone. The tourmalines from these rocks are black and patchy or fine association. Based on EPMA data the tourmalines studied are shorl-dravite in composition with more tendency towards shorl. They belong to granitic environment and precipitated during hydrothermal condition. The chemical composition of the host granite is a major factor in distribution of elements in the studied tourmaline structural framework during the process of differentiation, as well as, faulting and uplifting of granitoid body. Some of the dominant substitution mechanisms in the structure of the investigated tourmalines are as follow: □X Al (Na R2+)-1, 21 xNa-1 zAl-1+xCa1 YR (OH)-1, Fe2+ Fe3+) (Mg Al)-1. https://ijp.ui.ac.ir/article_16223_612d37c3637ca63c88a4723df3f31401.pdf