Two-sided asymmetric subduction; implications for tectonomagmatic and metallogenic evolution of the Lut Block, eastern Iran

• Main Authors: Reza Arjmandzadeh, Mohammad Hassan Karimpour, Seyed Ahmad Mazaheri, Jose Francisco Santos, Jorge Manuel Medina, Seyed Masoud Homam
• Format: Article
• Language: fas
• Published: Ferdowsi University of Mashhad 2011-07-01
• Series: Journal of Economic Geology
• Subjects: asymmetric subduction; tectono-magmatic; Lut Block; Afghan Block; isotope geochemical data
• Online Access: https://econg.um.ac.ir/index.php/econg/article/view/11445

West directed subduction zones show common characteristics, such as low structural elevation, deep trench, steep slab and a conjugate back-arc basin that are opposite to those of the east directed subduction zones. The tectonomagmatic and metallogenic setting of the Lut Block is still a matter of debate and several hypotheses have been put forward. Despite some authors denying the influence of the operation of Benioff planes, the majority propose that it occurred beneath the Afghan Block, while others consider that oceanic lithosphere was dragged under the Lut Block. Cu-Au porphyry deposits seem to occur in an island arc geotectonic setting during the middle Eocene while Mo-bearing deposits are coincident with the crustal thickening during Oligocene. We introduce new trace element and isotope geochemical data for granitoids and structural evidences testifying the two-sided asymmetric subduction beneath both Afghan and Lut Blocks, with different rates of consumption of oceanic lithosphere.