TY - JOUR ID - 131650 TI - Thermo-barometery of Permo-Triassic mafic Igneous intrusion, Talu, Eastern Alborz Zone JO - Scientific Quarterly Journal of Geosciences JA - GSJ LA - en SN - 1023-7429 AU - shahabi, shirin AU - Ghasemi, Habibollah AU - Rezaei-Kahkhaei, Mehdi AU - Minggou, Zhai AD - PhD, Student, Faculty of Earth Sciences, Shahrood University of Technology, Shahrood, Iran AD - Professor, Department of Petrology, Geochemistry and Economic Geology, Faculty of Earth Sciences, Shahroud University of Technology, Shahroud, Iran AD - Assistant Professor, Department of Petrology, Geochemistry and Economic Geology, Faculty of Earth Sciences, Shahroud University of Technology, Shahroud, Iran AD - PROFESSOR Institute of Geology and Geophysic, Chinese Academy of Science (IGGCAS), Beijing, China Y1 - 2021 PY - 2021 VL - 31 IS - 2 SP - 173 EP - 188 KW - Thermo-barometery" KW - "Permo-Triassic" KW - "mafic igneous intrusions" KW - "Talu Eastern Alborz DO - 10.22071/gsj.2020.237027.1809 N2 - 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). UR - http://www.gsjournal.ir/article_131650.html L1 - http://www.gsjournal.ir/article_131650_778637f0200fe59a36c13092799a1a34.pdf ER -