Tectonic setting of Mahirud Volcano-plutonic Complex: Different insight into the geodynamic history of East Iran

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KESHTGAR SH.; BAGHERI S.; BOOMERI M.

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Journal: GEOSCIENCES Year:2019 | Volume:29 | Issue:113 Page(s): 131-144

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Title

Tectonic setting of Mahirud Volcano-plutonic Complex: Different insight into the geodynamic history of East Iran

Author(s)

KESHTGAR SH. | BAGHERI S. | BOOMERI M. | Issue Writer Certificate

Keywords

Island arcQ2

Basaltic andesiteQ2

Tectonic settingQ1

CheshmeostadQ1

Mahirud ComplexQ1

Sistan suture zoneQ1

East of IranQ2

Abstract

The Mahirud volcano-plutonic Complex (MVPC), known as Cheshmeh Ostad Group too, is a rock assemblage including several plutons and volcano-sedimentary successions, crops out at the northeastern part of the Sistan suture zone. Igneous rocks of the MVPC consist of volcanic lavas and pyroclastic rocks that are andesitic basalt, diabase, micro-gabbro and dacite. The diabase was intruded by the Upper Cretaceous tonalitic stocks. The volcanic rocks have characteristics of the calc-alkaline to tholeiitic magmatic series. The spider-diagram patterns normalized to N-MORB and Chondrite is similar to the ones belong to the supra-subduction zone (SSZ) and Island arcs (IAT). Additionally, the EPMA studies on the key minerals in volcanic rocks such as clinopyroxene brought the same results. The probable presence of an island-arc chain in the Sistan suture zone, which some of its parts are considered here as the MVPC, is comparable to the Chagai-Raskoh and Kuhistan Cretaceous-Eocene island-arc/s in the east. Considering this reality, the Sistan Ocean must, therefore, be a larger ocean much wider than what was already proposed as a narrow oceanic seaway in the continental-rift setting.

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APA: Copy

KESHTGAR, SH., BAGHERI, S., & BOOMERI, M.. (2019). Tectonic setting of Mahirud Volcano-plutonic Complex: Different insight into the geodynamic history of East Iran. GEOSCIENCES, 29(113 ), 131-144. SID. https://sid.ir/paper/31379/en

Vancouver: Copy

KESHTGAR SH., BAGHERI S., BOOMERI M.. Tectonic setting of Mahirud Volcano-plutonic Complex: Different insight into the geodynamic history of East Iran. GEOSCIENCES[Internet]. 2019;29(113 ):131-144. Available from: https://sid.ir/paper/31379/en

IEEE: Copy

SH. KESHTGAR, S. BAGHERI, and M. BOOMERI, “Tectonic setting of Mahirud Volcano-plutonic Complex: Different insight into the geodynamic history of East Iran,” GEOSCIENCES, vol. 29, no. 113 , pp. 131–144, 2019, [Online]. Available: https://sid.ir/paper/31379/en

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