سنگ‌شناسی سنگ‌های آتشفشانی جوان گستره‌ی دریاچه‌ی هامون (خاور ایران)

There are scattered exposures of young volcanic rocks in Hamun Lake Area in south western and north western of Zabol in east of Iran. The microscopic evidences and geochemical analysis show that these rocks are olivine basalt and basalt to trachy basalt. The main textures of these rocks are porphyry, microlitic porphyry and vesicular. The main phenocrysts of these rocks are olivine, clinopyroxene (Diopside) and some plagioclase (Labradorite). Tectonomagmatic studies indicate that these rocks are formed in intracontinental environment in Helmand block and have sodic alkaline nature. These rocks can be the production of extension which has occurred after compressional regime in east of Iran. Enrichment of LREE to HREE ratio indicates that the parent magma has probably formed by low partial melting of garnet lherzolitic mantle.