کانی‌شناسی، ژئوشیمی و خاستگاه سنگ‌های نفوذی‌‌ و خروجی‌‌ چهارفرسخ، خاور پهنه‌ی لوت

Chaharfarsakh intrusive and extrusive rocks are located in 25 Km northwest of Nehbandan and 165 Km south of Birjand and in terms of geology, suituated in the eastern of Lut block. Chaharfaraskh intrusive rocks with Jurassic age were injected into shales and sandastons Shemshak Formation. Intrusive rocks are gabbro, diorite, synogranite, quartz monzonite, hornblend tonalite, granodiorite, granite, pegmatite and aplitic in composition. These rocks are composed of quartz, plagioclase, orthoclase, hornblend and biotite minerals but pyroxine minerals observed in gabbro rocks. They are dominating granular texture. Andesite and dacite are main extrusive rocks in Chaharfarsakh bodies and composed of plagioclase, hornblende, quartz, biotite minerals with porphyritic texture. Chaharfarsakh granitoid have subalkaline, meta to peralominouse nature, I type granitoids and show tendancy to contamination continental crust.Tectonic setting discrimination diagrams show these rocks belonging to volcanic arc granitoids position. It seems Chaharfarsakh extrusive rocks with Eocene age can be related to subduction of Neotethys ocean in the Cretaceous time, while Chaharfarsakh intrusive rocks to Jurassic are not justified with Cretaceous magmatism and probably differentiation formed from extousive rocks. It seems Chaharfarsakh granitoed formed similar to ShahKuh intrusive have been formed by partial melting the base of continental crust that was contamination during replacement with assimillation of metamorphic and sedimentary host rocks the upper crust.