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Riyahi Samani, Shabanian Boroujeni, Davoudian Dehkordi. Geochemistry and tectonic setting of granite-gneisses from Abadchi, north of Shahrekord. www.ijcm.ir. 2018; 26 (1) :195-208
URL: http://ijcm.ir/article-1-1060-en.html
Abstract:   (290 Views)
The granite-gneiss body of  Abadchi area (vicinity of Zayandeh-Rud dam) is a part of Sanandaj-Sirjan tectonic zone. The mineralogical composition of the granite- gneisses contains quartz, K-feldspar, plagioclase, biotite and muscovite and minor minerals of opaque, zircon, amphibole and allanite. The granite-gneiss rocks have been influenced by deformation dynamics and weakly Na-metazomatism. Geochemically, these rocks are calcic to calc-alkali, ferroan to magnesian, peraluminous to slightly metaluminous and are A to I-type granitoid. On the bases of chondrite-normalized REE diagram, they show a relatively enrichment in LREES rather than HREES with negative Eu anomalies. On primitive-mantle normalized spider diagrams, the rocks display relatively enrichment in LILE and LREE rather than HFSE which represent the magmatic rocks depending on arc and collision setting. This granite-gneiss is formed in post-collisional tectonic setting.
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Type of Study: Research | Subject: Special
Received: 2018/02/28 | Accepted: 2018/02/28 | Published: 2018/02/28

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