Mineral chemistry of tourmaline and comparison of its types in pegmatites of Zamanabad Area, Hamadan province

Mousavi, Sara; Shahrokhi, SeyedVahid; Zareisahamieh, Reza

doi:10.52547/gnf.6.2.445

Volume 6, Issue 2 (Autumn&Winter 2021) KJES 2021, 6(2): 445-464 | Back to browse issues page

‎ 10.52547/gnf.6.2.445

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Mousavi S, Shahrokhi S, Zareisahamieh R. Mineral chemistry of tourmaline and comparison of its types in pegmatites of Zamanabad Area, Hamadan province. KJES 2021; 6 (2) :445-464
URL: http://gnf.khu.ac.ir/article-1-2744-en.html

Mineral chemistry of tourmaline and comparison of its types in pegmatites of Zamanabad Area, Hamadan province

Sara Mousavi¹

, SeyedVahid Shahrokhi ^*

², Reza Zareisahamieh³

1- Khorramabad Branch of Islamic Azad University
2- Khorramabad Branch of Islamic Azad University , vahid.shahrokhi@Gmail.com
3- Lorestan University

Abstract: (1015 Views)

Zamanabad area is located in southern of Hamedan Province and belong to Sanandaj-Sirjan magmatic-metamorphic Zone. Lithologic units of this area comprising slate, phyllite, andalusite-garnet bearing schists, sillimanite bearing schists, hornfels, pegmatitic unit and recently alluviums. The most important of geological unit is Alvand granitoid pluton at age middle Jurassic. Presence of tourmalines with brown-green pleochroism and blue automorphic tourmalines such as probably indicolite is the specific features of tourmalines of Zamanabad area. Based on the microprobe analysis and multiple diagrams on tourmalines, the combination of tourmaline in granitic pegmatite is schorl and a few close to foitite. By the way, tourmalines in hornfels pegmatites are schorl and close to dravite. It was studied that tourmaline in granite pegmatites is alkaline and empty site whiles tourmaline in hornfels pegmatite is alkaline. Features such as automorphism, absence of chemical zoning, Al, Fe/Fe+Mg increase and decrease in X-site and host granite lack of Li and pegmatite and aplite related its show that these tourmalines have magmatic origin.Also, alkaline, without of X-site and further amount of Mg and a lesser amount of Al and Fe/Fe+Mg in tourmalines of hornfels pegmatites compatible to metapelites poor of Ca, metapesamites and tourmaline–quartz rocks show this complex have hydrothermal origin.

Keywords: Tourmaline, Indicolite, Magmatic, Hydrothermal, Zamanabad, Hamedan.

Full-Text [PDF 1825 kb] (459 Downloads)

Subject: Petrology
Received: 2020/04/16 | Accepted: 2020/12/22 | Published: 2021/02/28