Geology, Geochemistry and Petrogenesis of BazmanVolcano, SE of Iran

Shiaian, K; Ghalamghash, J; Vosoughi Abediny, M; Masoudi, F

doi:10.22071/gsj.2015.42387

Geology, Geochemistry and Petrogenesis of BazmanVolcano, SE of Iran

Document Type : Original Research Paper

Authors

K Shiaian ¹

J Ghalamghash ²

M Vosoughi Abediny ³

F Masoudi ⁴

¹ Ph.D. Student, Faculty of Basic Sciences, Islamic Azad University, Science and Research Branch, Tehran, Iran

² Assistant Professor, Research Institute for Earth Sciences, Geological Survey of Iran, Tehran, Iran

³ Associate Professor, Faculty of Basic Sciences, Islamic Azad University, Science and Research Branch, Tehran, Iran

⁴ Associate Professor, Department of Geology, Faculty of Earth Science, Shahid Beheshti University of Tehran, Iran

10.22071/gsj.2015.42387

Abstract

The Bazman volcano is located in the Makran Magmatic Arc. The pyroclastic rocks and lava with rhyodacitic to basaltic composition and calc-alkaline affinities erupted from the central and lateral craters of this volcano during the Quaternary period. The primitive mantle normalized Multi-elements diagrams show a relatively high abundance of LIL relative to HFS incompatible elements with negative anomalies of Nb and Ti. Their chondrite–normalized REE patterns are slightly enriched in LREE relative to HREE with negative Eu anomalies. These geochemical features suggest that the volcanic rocks of bazman formed in a subduction setting by partial melting of metasomatized mantle. On the base of La/Yb vs Dy/Yb and La/Sm vs Sm/Yb diagrams the sources of the magmas is phlogopite-spinel-lherzolite or/and phlogopite-garnet- lherzolite.

Keywords

Geochemisty

Petrogenesis

Volcano

Subduction

Continental Arc

Bazman

Sistan

Iran