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Yazdi, Abdollah, Shahhosseini, Elham, Moharami, Farhad. (1400). Petrology and tectono-magmatic environment of the volcanic rocks of West Torud – Iran. نشریه علمی پژوهشی دانشگاه آزاد اسلامی, 14(1), 40-57. doi: 10.30495/ijes.2022.1929200.1601
Abdollah Yazdi; Elham Shahhosseini; Farhad Moharami. "Petrology and tectono-magmatic environment of the volcanic rocks of West Torud – Iran". نشریه علمی پژوهشی دانشگاه آزاد اسلامی, 14, 1, 1400, 40-57. doi: 10.30495/ijes.2022.1929200.1601
Yazdi, Abdollah, Shahhosseini, Elham, Moharami, Farhad. (1400). 'Petrology and tectono-magmatic environment of the volcanic rocks of West Torud – Iran', نشریه علمی پژوهشی دانشگاه آزاد اسلامی, 14(1), pp. 40-57. doi: 10.30495/ijes.2022.1929200.1601
Yazdi, Abdollah, Shahhosseini, Elham, Moharami, Farhad. Petrology and tectono-magmatic environment of the volcanic rocks of West Torud – Iran. نشریه علمی پژوهشی دانشگاه آزاد اسلامی, 1400; 14(1): 40-57. doi: 10.30495/ijes.2022.1929200.1601

Petrology and tectono-magmatic environment of the volcanic rocks of West Torud – Iran

Iranian Journal of Earth Sciences
مقاله 4، دوره 14، شماره 1، فروردین 2022، صفحه 40-57    اصل مقاله (2.88 M)
نوع مقاله: Original Research Paper
شناسه دیجیتال (DOI): 10.30495/ijes.2022.1929200.1601
نویسندگان
Abdollah Yazdi* 1؛ Elham Shahhosseini2؛ Farhad Moharami3
1Department of Geology, Kahnooj Branch, Islamic Azad University, Kahnooj, Iran
2Department of Geology, North Tehran branch, Islamic Azad University, Tehran
3Department of Geology, Payame Noor University, Tehran, Iran
چکیده
        Middle-Upper Eocene volcanic and volcano-sedimentary rocks of the Torud region have been formed by the sequences of basic-intermediate lavas, pyroclastic rocks, and sedimentary layers (e.g., siltstone, sandstone, and nummulite-bearing limestone) within a shallow marine basin. According to microscopic studies, the volcanic rocks of the region include basalt, basaltic andesite, trachyandesite, andesite, and dacite. These rocks have originated from the differential crystallization processes and occasionally calc-alkaline contamination geochemical properties. Generally, they contain olivine, clinopyroxene, and plagioclase ± amphibole minerals. Porphyritic to megaporphyritic textures with microlithic and flow matrixes are observed in these rocks. Studying the main and rare elements of these rocks indicates that reducing MgO content is accompanied by an increase in Al2O3, K2O, Na2O, and SiO2 and a decrease in Fe2O3 and CaO concentrations. These rocks are mainly enriched in LIL and LREE elements but depleted of HFS elements. The prominent features of these rocks are the presence of positive anomalies in the K, Sr, Rb, and Ba elements, the depletion of some samples of Nb and Ta, and their depletion of Ti and P. This result reveals the crustal contamination of the mantle mafic magma constructing these rocks. According to the geochemical data, magmatic pollution has not been an effective process in the formation of these rocks. In addition, the relatively higher levels of Cr, Ni, and MgO in the alkali basalts of the region indicate that these rocks are originated from partial melting (5 to 10%) of a spinel-garnet peridotite. Overall, they have no subduction-dependent rock characteristics and mainly represent characteristics of alkali basaltic magmas of the preliminary back-arc basin (BAB). These features, attributed to their calc-alkaline nature, represent the formation of these rocks in a tectonic back-arc setting in the Middle-Upper Eocene.
کلیدواژه‌ها
Petrology؛ Geochemistry؛ Volcanic rocks؛ Eocene؛ Back-arc؛ Torud
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