Volume 24, Issue 4 (1-2017)                   www.ijcm.ir 2017, 24(4): 731-742 | Back to browse issues page

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Petrographic and geochemical evidences of restites (residual source material minerals) in the Gole- zard and Darreh-bagh granitoidic plutons (Aligoodarz, Lorestan Province). www.ijcm.ir 2017; 24 (4) :731-742
URL: http://ijcm.ir/article-1-68-en.html
Abstract:   (2775 Views)

Aligoodarz granitoidic plutons (Gole -zard and Darreh -bagh) with Middle Jurassic ages are intruded into low grade regional metamorphic rocks (slate and phyllite) and caused aureole of low to medium grade metamorphic rocks (albite-epidote hornfelse facies). Based on precise field, petrographic and geochemistry investigations, the granites belong to the S- type and their composition range from granodiorite to granite and leucogranite. Calcic core of plagioclase (An91-84) with complicated zonation, andalusite xenocrysts, crushed garnet  with uniform composition Alm70Py22Gro4Sps4 in core, small biotite ± sillimanite assemblages and accessory minerals of zircon, monazite and apatite in granodiorite parts are the main residual minerals from partial melting of the source rocks and they considered as restite. This interpretation confirms with petrographic and geochemistry evidences in current study and it seems the separation of restite crystals from the primary melt and fractional crystallization have been effective differentiation process in granodiorite and felsic component, respectively. Mafic dykes are evidences of emplacement of mafic magmas related to subduction zone and played as an important role in melting of crustal rocks.

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Type of Study: Research | Subject: Special

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