Document Type : Original Research Paper


1 PhD, Student, Faculty of Earth Sciences, Shahrood University of Technology, Shahrood, Iran

2 Professor, Department of Petrology, Geochemistry and Economic Geology, Faculty of Earth Sciences, Shahroud University of Technology, Shahroud, Iran

3 Assistant Professor, Department of Petrology, Geochemistry and Economic Geology, Faculty of Earth Sciences, Shahroud University of Technology, Shahroud, Iran

4 PROFESSOR Institute of Geology and Geophysic, Chinese Academy of Science (IGGCAS), Beijing, China


In the Talu area at NE Damghan in the Eastern Alborz Zone, the Permo-Triassic carbonate sequences host several mafic igneous inrusions with olivine gabbro, gabbro and alkali-diorite compositions. The most important rock-forming minerals of these intrusions are olivine, clinopyroxene, amphiboles and plagioclase. These rocks have alkaline nature and their major and trace elements characteristics correspond to OIB-like mantle source. The olivines of these rocks are chrysolite, and the plagioclases are characterized by albite, oligoclase and labradorite. Clinopyroxenes are diopside, augite and salite in composition and characterized with alkaline nature (Non-orogenic). They crystallized in 6-11 Kbar, 1200-1250˚C and high oxygene fugasity conditions. Amphiboles are of calcic and high-Ti kaersutite type and crystallized in igneous conditions with mantle source. The amphiboles were crystallized in temperatures and pressures over than 950˚C and 650-750 MPa (equivalent to 6.5-7.5 Kbar).


Main Subjects

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