Petrography and geochemistry of igneous rocks and antimony mineralization in Lakhshak, northwest of Zahedan, southeastern Iran
Mohammad Boomeri
1
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*, Halimeh Mojadadi
2
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Habib Biabangard
3
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Keywords: Sistan suture zone, Intrusive and Subvolcanic igneous rocks, Sb mineralization, ,
Abstract :
Abstract: The Lakhshak Sb index is located in northwest of Zahedan in the Sistan suture zone. The geological units of the area are metamorphosed flysch, granitoid pluton, acidic and basic dikes, mineralized and un-mineralized silicic veins. According to geochemical studies, Lakhshak igneous rocks are calc-alkaline, high-K calc-alkaline and shoshonitic, metaluminous and belong to volcanic arc, and collisional and post-collisional tectonic settings. The study igneous rocks are characterized by LREE and LILE enrichment relative to HREE and HFSE. Enrichment of Pb and depletion of Zr, Nb and Y are more consistent with melts generated from the lower crust. The Sb mineralization in the Lakhshak is an epithermal type that mainly occurs as quartz-stibnite veins in flysch-like rocks and associated with silicic, argillic and phyllic alterations.
