Petrology and Tectonic Setting of Volcanic Rocks in West and South West of Salafchegan, Qom, Iran

• 作者: Afshin Ashja Ardalan Mohammad Hashem Emami Mozhgan Taheri Seyed Jamal Shaikh Zakariay
• 来源期刊: 地质学期刊(英文)
• 学科: 地球科学
• 关键词: Volcanic Rocks ANDESITE Central IRANIAN VOLCANO Plotonic Belt Salafchegan Iran
• 年，卷（期）: 2017,（6）
• 页码范围: 745-767
• 页数: 23页
• 分类号: P5

摘要

In the west and south-west part of Salafchegan near Zavarian village in Iran (in central Iranian volcano plotonic belt), there are some volcanic rocks. Based on petrography and geochemistry findings, these volcanic rocks are Basalt, Andesite, Tracky-Andesite, Trackyte, Latite, Dacite. Tectono-magmatic diagram Y versus Zr shows the magmatic arc setting and Zr/TiO2 versus Ce/P2O5 diagram contrasts post colligenal magmatic arcs. The HFSE depletion in the MORB spider diagram shows significant volcanic arc magmatism. The high enrichment of Eu, Sr, Th, Rb, Cs, K (LFS elements) and Y, Zr, Hf shows negative anomaly and subduction tectonic setting. Based on MORB, Chondrite and primitive mantle spider diagrams, LREE have enriched to HREE in this area. The results of petrography, geochemistry and tectonic setting studies in this area, indicate that neogene magmatism occurred in post colligenal tectonic setting—subduction of Neo-thetise ocean under central Iranian plate in neogen era.