Thermo-barometery  of Permo-Triassic mafic Igneous intrusion, Talu, Eastern Alborz Zone

Shahabi, Shirin; Ghasemi, Habibollah; Rezaei-Kahkhaei, Mehdi; Minggou, Zhai

doi:10.22071/gsj.2020.237027.1809

Document Type : Original Research Paper

Authors

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

https://doi.org/10.22071/gsj.2020.237027.1809

Abstract

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).

Keywords

Main Subjects

Petrology

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Scientific Quarterly Journal of Geosciences

Thermo-barometery of Permo-Triassic mafic Igneous intrusion, Talu, Eastern Alborz Zone

References

References

Volume 31, Issue 2 - Serial Number 120
Volume 31, Issue 2, Serial Number 120, Summer 2021
September 2021
Pages 173-188

Thermo-barometery of Permo-Triassic mafic Igneous intrusion, Talu, Eastern Alborz Zone

References

References

Volume 31, Issue 2 - Serial Number 120Volume 31, Issue 2, Serial Number 120, Summer 2021September 2021Pages 173-188

Volume 31, Issue 2 - Serial Number 120
Volume 31, Issue 2, Serial Number 120, Summer 2021
September 2021
Pages 173-188