Provenance of Upper Devonian Ilanqareh Formation (NW Iran), assessed using petrography and major element geochemistry

IF 0.5 4区地球科学 Q4 GEOLOGY Boletin De La Sociedad Geologica Mexicana Pub Date : 2022-12-13 DOI:10.18268/bsgm2022v74n3a160722

Javad Anjerdi, M. Jafarzadeh, Adel Najafzadeh, R. Mahari

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Abstract

In this study, a combination of petrographic and major element geochemical methods was employed on sandstones and shales of Upper Devonian Ilanqareh Formation, northwest of Iran, aimed at investigating the tectonic setting and the weathering degree of rocks in the source area. The index of compositional variability (ICV below 1) indicated that the studied quartzarenite and subarkose sandstones were not in the first cycle. Petrographic studies showed the existence of a craton interior provenance for these sandstones and geochemical studies identified recycling of older formations as an important source of these deposits. The chemical index of alteration (CIA values of 78.18 to 90.42 for sandstones and 91.55 to 91.93 for shale samples) indicated that the samples were affected by the high degree of weathering due to the humid climate in the source areas. Geochemical discrimination diagrams revealed that the samples were deposited in a passive margin. According to the paleogeography, this passive margin was the margin of a rift basin in the northwest of Gondwana, and the Ilanqareh deposits were derived from the Arabian-Nubian shield and the recycling of the Lower Palaeozoic sandstones in the region.

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伊朗西北部上泥盆统Ilanqareh组物源区岩石学及主元素地球化学评价

本研究采用岩石学和主元素地球化学相结合的方法，对伊朗西北部上泥盆统Ilanqareh组砂岩和页岩进行了研究，探讨了烃源区构造背景和岩石风化程度。成分变异性指数(ICV < 1)表明所研究的石英岩和亚粗砂岩不在第一旋回。岩石学研究表明，这些砂岩存在克拉通内部物源，地球化学研究表明，旧地层的再循环是这些矿床的重要来源。砂岩蚀变化学指数(CIA)为78.18 ~ 90.42，页岩蚀变化学指数为91.55 ~ 91.93，表明烃源区气候湿润，风化程度较高。地球化学判别图显示样品沉积于被动边缘。古地理研究表明，该被动边缘为冈瓦纳西北裂谷盆地边缘，Ilanqareh矿床形成于阿拉伯-努比亚盾构和下古生界砂岩的再循环作用。

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来源期刊

Boletin De La Sociedad Geologica Mexicana GEOLOGY-

CiteScore

1.40

自引率

12.50%

发文量

审稿时长

50 weeks

期刊介绍： The Boletín de la Sociedad Geológica Mexicana is a completely free-access electronic journal published semi-annually that publishes papers and technical notes with its main objective to contribute to an understanding of the geology of Mexico, of its neighbor areas, and of geologically similar areas anywhere on Earth’s crust. Geology has no boundaries so we may publish papers on any area of knowledge that is interesting to our readers. We also favor the publication of papers on relatively unfamiliar subjects and objectives in mainstream journals, e.g., papers devoted to new methodologies or their improvement, and areas of knowledge that in the past had relatively little attention paid them in Mexican journals, such as urban geology, water management, environmental geology, and ore deposits, among others. Mexico is a land of volcanos, earthquakes, vast resources in minerals and petroleum, and a shortage of water. Consequently, these topics should certainly be of major interest to our readers, our Society, and society in general. Furthermore, the Boletín has been published since 1904; that makes it one of the oldest scientific journals currently active in Mexico and, most notably, its entire contents, from the first issue on, are available online.