Volume 15, Issue 2 (10-2007)                   www.ijcm.ir 2007, 15(2): 311-332 | Back to browse issues page

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Mineral chemistry of tourmaline in quartz-tourmaline veins of Nezamabad area (southwestern Astaneh, Markaz; Province, Iran). www.ijcm.ir. 2007; 15 (2) :311-332
URL: http://ijcm.ir/article-1-809-en.html
Abstract:   (527 Views)

Nezamabad region is a part of Boroujerd granitoid comple)(
(western Iran) which has been cut by various quartz-tourmaline veins with
appro)(imately 0,5 to 2 m thickness, Mineralogical and electron microprobe
analyses of the tourmalines in those veins and quartzdioritic host rock show
that they are schor! and dravite one in terms of composition (with a general
tendency toward dravite end member) and alkaline and calcic type
respectively, The FeO*' (FeO*+MgO) ratio of the studied tourmalines are
between 0,5 to 0.8, demonstrate that the element·rich fluids have originated
from'S; 1 Km for from the veins. Accruing as vein fonn and showing optical
zoning as well as widely varying compositions, they have also more
magnesium than iron, fluorine amount simi lar to hydrothermal veins and
tendency away from alkali· and proton·deficient tourmaline. There fore, it
can be concluded that the veins are hydrothermal one and have been formed
by dehydration of metamorphosed sedimentary rocks and its mixing with
granitic fluids in an open chemical system.

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Type of Study: Research | Subject: Special
Received: 2017/06/17 | Accepted: 2017/06/17 | Published: 2017/06/17

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