Mineralogy, geochemistry and role of olivine mechanical separation in generation of Lower Paleozoic igneous rocks in Shirgesht area, NW of Tabas, Central Iran

This area is located in Derenjal Mountains, 60Km northwest of Tabas in central Iranian structural zone. The igneous rocks occur as plutonic with composition of olivine- gabbro, gabbro, diorite and monzodiorite in Kalshaneh Formation with Middle Cambrian age and as the extrusive rocks with composition of olivine basaltic lavas in lower part of Niur Formation with Silurian age. Petrographical and geochemical evidences show a genetic relationship...