TITLE:
Petrology and Tectonic Setting of Volcanic Rocks in West and South West of Salafchegan, Qom, Iran
AUTHORS:
Mozhgan Taheri, Afshin Ashja Ardalan, Mohammad Hashem Emami, Seyed Jamal Shaikh Zakariay
KEYWORDS:
Volcanic Rocks, Andesite, Central Iranian Volcano Plotonic Belt, Salafchegan, Iran
JOURNAL NAME:
Open Journal of Geology,
Vol.7 No.6,
June
2,
2017
ABSTRACT:
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.