Journal Article10.1080/00206814.2013.821268
Quaternary high-Nb basalts: existence of young oceanic crust under the Sanandaj–Sirjan Zone, NW Iran
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TL;DR: In this paper, the authors proposed that the partial fusion of metasomatized mantle associated with adakitic magma was responsible for generation of the HNB rocks following late Miocene collis...
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Abstract: Quaternary basaltic volcanoes are distributed in the northern part of the Sanandaj–Sirjan Zone (N-SSZ). Those in the Ghorveh area of the N-SSZ are characterized by low SiO2, high alkalis, and LILE + LREE enrichment. They also have high Mg numbers (Mg# = 65–70) and high contents of Cr (>300 ppm), Ni (>177 ppm), and TiO2 (>1.5 wt.%), suggesting that they crystallized directly from primary magma. The basalts are classified as high-Nb basalts (HNB), with Nb concentrations greater than 20 ppm. Their 87Sr/86Sr values range from 0.7049 to 0.7053 and their ϵ0Nd values lie between –0.2 and 1.1. The small negative values of ϵ0Nd indicate involvement of continental material in the evolution of the source magma in the area. Based on these new chemical and isotopic data and their relationship to the Plio-Quaternary volcanic adakites in northern Ghorveh, we propose that the partial fusion of metasomatized mantle associated with adakitic magma was responsible for generation of the HNB rocks following late Miocene collis...
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Citations
Strongly peraluminous leucogranite (Ebrahim-Attar granite) as evidence for extensional tectonic regime in the Cretaceous, Sanandaj Sirjan zone, northwest Iran
Hossein Azizi,Keivan Mohammadi,Yoshihiro Asahara,Motohiro Tsuboi,Narges Daneshvar,Behzad Mehrabi +5 more
Abstract: The Ebrahim-Attar (EBAT) leucogranite body is intruded within the Jurassic metamorphic complex of the Ghorveh area, located in the northern part of the Sanandaj Sirjan zone (SaSZ) of northwest Iran. The granite comprises alkali feldspar, quartz, Na-rich plagioclase and to a lesser extent, muscovite and biotite. Garnet and beryl are also observed as accessory minerals. Additionally, high SiO2 (71.4–81.0wt %) and Rb (145–440 ppm) content; low MgO (
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Zircon U-Pb ages, geochemistry, and Sr-Nd isotope ratios for early cretaceous magmatic rocks, southern Saqqez, northwestern Iran
TL;DR: In this paper, the authors considered zircon U-Pb dating, whole-rock chemistry and Sr-Nd isotope ratios of Cretaceous magmatic rocks in the Sanandaj-Sirjan Zone (SaSZ) to develop a new geodynamic model for the evolution of these volcanic rocks.
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Adakites, High-Nb Basalts and Copper–Gold Deposits in Magmatic Arcs and Collisional Orogens: An Overview
TL;DR: Adakites are Y-and Yb-depleted, SiO2-and Sr-enriched rocks with elevated Sr/Y and La/Yb ratios originally thought to represent partial melts of subducted metabasalt, based on their association with the subduction of young (<25 Ma) and hot oceanic crust as discussed by the authors .
The Van Microplate: A New Microcontinent at the Junction of Iran, Turkey, and Armenia
Hossein Azizi,Motohiro Tsuboi +1 more
TL;DR: In this article, the Van microplate and surrounding ocean have played an important role in the evolution of magmatic activity in northwestern Iran, eastern Turkey, and the Caucasus since the Cretaceous.
Early Miocene Post-collision Andesite in the Takab Area, NW Iran
Hossein Azizi,Narges Daneshvar,Asrin Mohammadi,Yoshihiro Asahara,Scott A. Whattam,Motohiro Tsuboi,Masayo Minami +6 more
TL;DR: In this paper, the authors show that most of the Early Miocene andesites are andesite with subordinate dacite and conclude that andesitic rocks, even with typical arc signatures, are not always generated in an active margin and that some were probably generated in a post-collision tectonic regime.
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