Basic magmatism in the extentional back-arc basin of the Lower-Middle Jurassic on the Northern edge of Central Iran-South of Eastern Alborz zones, Shahrood-Damghan

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GHASEMI H.; ROSTAMI HOSSURI M.; SADEGHIAN M.

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Journal: GEOSCIENCES Year:2018 | Volume:27 | Issue:107 Page(s): 123-136

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Title

Basic magmatism in the extentional back-arc basin of the Lower-Middle Jurassic on the Northern edge of Central Iran-South of Eastern Alborz zones, Shahrood-Damghan

Author(s)

GHASEMI H. | ROSTAMI HOSSURI M. | SADEGHIAN M. | Issue Writer Certificate

Keywords

MagmatismQ1

Extentional BasinQ2

Back-arcQ2

JurassicQ2

Central IranQ2

Eastern AlborzQ2

Abstract

The Lower Jurassic basin of northern margin of Central Iran structural zone and south of Eastern Alborz in Semnan province, contains igneous rocks with basic composition, belonging to early stages of occurrence and development of an immature extensional back arc basin at this time. These basic igneous rocks cropped out in at the base of Shemshak Formation and its equivalent in Central Iran Structural zone, in the form of extrusive (basaltic rocks) and intrusive (dike, sill and microgabbroic small stocks) rocks. Magma forming of these rocks have had calc – alkaline nature and was enriched in large ion lithophile elements (LILE) and light rare earth elements (LREE) and also was depleted in heavy rare earth elements (HREE). The mentioned magmas was, originated from 5 to 30% partial melting of the spinel peridotitic (below the Central Iran) and garnet lherzolithic (below the Eastern Alborz) mantle plumes in an immature extensional back arc basin tectonic setting due to oblique subduction of Nneothetyan oceanic lithosphere beneath the Central Iran structural zone at late Triassic to middle Jurassic time, and were ascending to upper levels of continental crust by fault and fracture systems and emplaced in shallow sedimentary basins of these zones in different ways. This basin was formed in the behind of the upper Triassic – Lower Jurassic magmatic arc of Central Iran and due to initiation of extensional movements in the continental crust of Central Iran and Alborz.

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APA: Copy

GHASEMI, H., ROSTAMI HOSSURI, M., & SADEGHIAN, M.. (2018). Basic magmatism in the extentional back-arc basin of the Lower-Middle Jurassic on the Northern edge of Central Iran-South of Eastern Alborz zones, Shahrood-Damghan. GEOSCIENCES, 27(107 ), 123-136. SID. https://sid.ir/paper/31564/en

Vancouver: Copy

GHASEMI H., ROSTAMI HOSSURI M., SADEGHIAN M.. Basic magmatism in the extentional back-arc basin of the Lower-Middle Jurassic on the Northern edge of Central Iran-South of Eastern Alborz zones, Shahrood-Damghan. GEOSCIENCES[Internet]. 2018;27(107 ):123-136. Available from: https://sid.ir/paper/31564/en

IEEE: Copy

H. GHASEMI, M. ROSTAMI HOSSURI, and M. SADEGHIAN, “Basic magmatism in the extentional back-arc basin of the Lower-Middle Jurassic on the Northern edge of Central Iran-South of Eastern Alborz zones, Shahrood-Damghan,” GEOSCIENCES, vol. 27, no. 107 , pp. 123–136, 2018, [Online]. Available: https://sid.ir/paper/31564/en

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