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tavakoli P, Poosti M, Gadami G. Petrogenesis of volcanic rocks in Baghchenar ophiolitic complex, North of Hormozgan province. www.ijcm.ir 2024; 32 (3) :551-564
URL: http://ijcm.ir/article-1-1924-en.html
URL: http://ijcm.ir/article-1-1924-en.html
1- Department of Geology, Faculty of Sciences, Hormozgan University, Bandarabas, Iran
Abstract: (625 Views)
The volcanic rocks of the Bagh Chenar region are located in the northeast of Hormozgan province, Hajiabad city. Structurally, these rocks are located in the collision range of Central Iran with the Sanandaj-Sirjan zone. The rock units in this area include pillow lava, microgabbro dyke, ultramafic, and deep marine sediments; including pelagic limestones and radiolarite cherts and some thin sedimentary layers and metamorphic rocks which have been piled on top of each other in the form of a colored mélange complex during the period of magmatic activity. Field studies show that this area's volcanic rocks include basalt and basalt andesite. The textures of these rocks are porphyry, hyaloporphyry, and glomeroporphyry. The main minerals include plagioclase and pyroxene as majors and minor and secondary minerals include calcite, chlorite, and opaque minerals located in a glassy and microcrystalline field. The pattern of rare earth elements (REE) and spider diagrams indicate the enrichment of LILE and LREE and some HFSE elements. According to the diagrams, the studied rocks are within the tholeiitic magmatic series with the origin of the mid-oceanic ridge. Also, based on the tectonic environment chart, the samples are located in the subduction zone or mid-ocean ridge. The results of this study show that the volcanic rocks of the Bagh Chenar ophiolite complex are composed of tholeiite magma. This magma was formed in a marine extension tectonic environment and the evolutionary processes of magma in this complex included fractional crystallization, magmatic isolation, and crustal contamination.
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