Petrology and geochemistry of diabasic dikes and andesitic-basaltic lavas in Noorabad-Harsin ophiolite, SE of Kermanshah, Iran

Tahmasbi, Zahra; Kiani, Masoud; Khalaji, Ahmad Ahmadi

doi:10.1007/s12583-016-0686-4

Cited by 10 publications

(7 citation statements)

References 40 publications

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“…This alkaline basalt type is also seen in Neyriz of Iran and Havasina of Oman series (Triassic to Cretaceous), and related to Gondwana rifting in the early stages of Neotethys ocean formation. studies, suggested that pillow basalt and dikes in Kermanshah ophiolite complex, are toleiitic and calc-alkaline in nature and based on the tectonic discrimination diagrams are grouped in toleiitic to calc-alkaline basalts field of the island arc setting (Shafaii Moghadam and Stern, 2011;Tahmasbi et al, 2016;Kiani et al, 2019), and confirmed the results of this study.…”

Section: Tectonic Model Of Noorbad Ophiolitesupporting

confidence: 89%

“…The outer ophiolite belt with NW-SE trending including Kermanshah, Neyriz and Haji Abad-Esfandagheh ophiolites are located along the Bitlis-Zagros suture zone that connects the Mediterranean ophiolites (e.g., Troodos) to the Middle East and Asian ophiolites (e.g., Oman). In recent years, many researchers have worked in the Zagros suture zone Saccani et al, 2013;Whitechurch et al, 2013;Azizi et al, 2013;Allahyari et al, 2014;Aswad et al, 2014;Shafaii Moghadam and Stern, 2015;Nouri et al, 2016;Tahmasbi et al, 2016). Generally, intermediate and mafic rocks in the eastern Mediterranean ophiolite complex represents Map showing locations of major Iranian ophiolites (modified Stöcklin, 1968).…”

Section: Introductionmentioning

confidence: 99%

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Petrology and Geochemistry of Noor abad ophiolite (Lorestan province, west Iran): an evidence of intra-oceanic subduction

Kiani¹

2020

Acta Geodynamica Et Geomaterialia

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The Noorabad ophiolite is part of Kermanshah ophiolites in NW of Lorestan province, west Iran. The Kermanshah ophiolite complex with NW-SE trending is located in the SSW of the main Zagros thrust fault within the high Zagros zone. Rocks of the Noorabad ophiolite include diabases dikes, basalts lava and andesite that outcropped in the south of the Noorabad. These rocks are intensly altered and fractured that led to hydrothermal alteration and replacement of primary minerals such as pyroxene, plagioclase and opaque minerals by secondary minerals. Based on geochemical studies, the rocks of this area have tholeiitic and calc-alkaline signature. Also the plotted rock samples in geochemical discrimination diagrams, occur in island arc basalt (IAB) field. These rocks show depletion in HREE and HFSE and also are enriched in LILE and LREE. These patterns suggest that these rocks formed in intra-oceanic subduction zone. These geochemical characteristics along with comparison with other ophiolitic rocks in east Mediterranean reveal a subduction zone environment for genesis of the intermediate and mafic rocks of the Noorabad ophiolite.

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Section: Tectonic Model Of Noorbad Ophiolitesupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Petrology and Geochemistry of Noor abad ophiolite (Lorestan province, west Iran): an evidence of intra-oceanic subduction

Kiani¹

2020

Acta Geodynamica Et Geomaterialia

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“…This ophiolite, together with other similar back‐arc‐basin‐type ophiolites along the NQOB, namely, the Laohushan (Qian & Zhang, 2001), Zhihe (J. X. Zhang et al, 2007), Jiugequan (X. H. Xia & Song, 2010), Wushaoling (Wang, Liu, Liu, & Ou, 2012), Biandukou (S. G. Song et al, 2013), Lenglongling (Luo, 2015), and Kawa ophiolites (Bian et al, 2016), constitute a NW‐SE‐trending back‐arc basin ophiolitic belt that is spatially parallel to the arc volcanic rocks (Figure 1b). In the back‐arc basin setting, the basalts from the Xiejiayao ophiolite show subduction signatures derived from slab‐derived fluids/melts (Harper, 2003; Hu, Zhai, Wang, Tang, & Ren, 2017; Tahmasbi et al, 2016; X. H. Xia & Song, 2010; R. G. Zheng et al, 2013), for example, enrichments in fluid‐mobile elements (e.g., U, Th, and Sr; Figure 4a) and LREEs (Figure 4b), negative Nb‐Ta anomalies, low Nb/La and Nb/Ta ratios, and low TiO 2 contents, as well as high Zr/Nb ratios. Moreover, the enhanced Th/Yb ratios above the MORB‐OIB array (Figure 11) were likely in relation to slab‐derived hydrous fluids (Harper, 2003).…”

Section: Discussionmentioning

confidence: 99%

“…Most importantly, ophiolites can serve as the best candidates for further understanding of the tectonic evolution of ancient oceans and associated orogenic belts (e.g., Dong et al, 2008; Shervais, 2001; J. F. Xu, Zhang, & Han, 2008; J. Zhao et al, 2019). Dilek and Furnes (2014) recently summarized that “a completed ophiolitic sequence includes upper mantle peridotites, layered ultramafic‐mafic rocks, layered to isotopic gabbros, sheeted dikes, extrusive rocks, and a sedimentary cover from bottom to top.” A representative example would be the Noorabad‐Harsin ophiolite in Iran (Tahmasbi, Kiani, & Khalaji, 2016). In fact, with respect to ultramafic rocks, which are easily altered and dismembered owing to late‐stage tectonic movements (e.g., Tadesse & Allen, 2005; J. Zhao et al, 2019, 2021; R. G. Zheng, Wu, Zhang, Xu, & Meng, 2013), most of these oceanic crust rocks (e.g., basalt and gabbro) are well preserved in oceanic subduction zones and witness the opening‐subduction transition of the oceans.…”

Section: Introductionmentioning

confidence: 99%

Compositional and Sr‐Nd isotopic features of the Xiejiayao ophiolite in the North Qilian Orogenic Belt, NW China: Implications for the petrogenesis and tectonic setting

Zhao

et al. 2022

Geological Journal

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The ophiolites along the North Qilian Orogenic Belt are considered to be fragments of ancient oceanic crusts and lithospheric mantle of the Palaeozoic North Qilian Ocean (a branch of the Proto‐Tethys). Compared with other ophiolites in this belt, the genesis of the Xiejiayao ophiolite has been poorly studied so far, making it difficult to understand the tectonic evolution of the ocean. In this study, we present new compositional and Sr‐Nd isotopic analyses of basaltic rocks from the Xiejiayao ophiolite to shed light on its petrogenesis and geodynamic background. These oceanic basalts are characterized by flat REE patterns, low elemental ratios of high‐field‐strength elements (e.g., La/Sm, Sm/Yb, La/Yb, Gd/Yb, [Th/Yb]PM) and abundant spinels, implying that they were generated via partial melting in the spinel stability field of the mantle. Their positive εNd(t) values (6.1–8.4), high Zr/Nb (43.65–79.40) as well as low Nb/Ta (10.91–15.09), Zr/Hf (34.64–39.28), and Nb/Yb (0.41–0.59) ratios further reflect that the ancient mantle had already become depleted to some extent before the onset of the Palaeozoic ocean. Additionally, basalts share many geochemical similarities (e.g., Zr, Y, Ti, and V) with both mid‐ocean ridge and island arc basalts. This supports the strong likelihood of origin in a back‐arc basin close to the suprasubduction zone for the ophiolite. Therefore, accompanied by the northward subduction of the oceanic lithosphere during the early Palaeozoic, a large‐scale back‐arc basin developed progressively in response to the back‐arc expansion. The Xiejiayao basaltic magmas were generated in the back‐arc basin via partial melting of the depleted mantle and their source was probably mixed with subducted melts/fluids from the dehydration and melting of oceanic slabs and sediments.

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“…The western part of Alborz-Azerbaijan structural zone with WNW-ESE trending was distinguished by Cenozoic magmatic activities in Alpine-Himalayan folded belt (Berberian and King, 1981). This region was formed in tectonic conditions of magmatic and back arcs (Allen et al, 2003;Nabatian et al, 2014a;Tahmasbi et al, 2016;Wan et al, 2018).…”

Section: Geological Settingmentioning

confidence: 99%

Relationship between Fe-Cu-REEs mineralization and magnetic basement faults using multifractal modeling in Tarom region, NW Iran

Adib

Nabilou²,

Afzal

2022

Episodes

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In this paper, a Concentration-Distance to Magnetic Faults (C-DMF) fractal model was applied to distinguish Fe, Cu and REEs mineralized zones based on their distance to basement faults derived via airborne geophysical data and field survey maps in the Tarom region at the western Alborz-Azerbaijan belt, NW Iran. The application of the C-DMF model was utilized for mineralization classification in the Tarom 1:100,000 sheet which reveals that the main Fe, Cu and REEs mineralization have an inverse correlation with their distances to magnetic faults (fault lineaments). The Cu ores within acidic rocks and the Fe/ REEs mineralization within intermediated rocks are located in the Northern and Southern parts of the Tarom region, respectively. Furthermore, the basement fault and intrusive rocks have overlapped and they have important roles for these metallic deposits/occurrences. Based on the C-DMF log-log plots, Fe, REEs and Cu high-grade mineralization values are larger than 48.31%, and 3.8%, with respective distances of 451 and 732 m to the nearest magnetic faults. The results obtained from the fractal modeling indicate a positive relationship between Fe, REEs mineralization and the basement faults. Consequently, Cu mineralization has a weak relationship to faults in comparison with Fe and REEs.

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Petrology and geochemistry of diabasic dikes and andesitic-basaltic lavas in Noorabad-Harsin ophiolite, SE of Kermanshah, Iran

Cited by 10 publications

References 40 publications

Petrology and Geochemistry of Noor abad ophiolite (Lorestan province, west Iran): an evidence of intra-oceanic subduction

Petrology and Geochemistry of Noor abad ophiolite (Lorestan province, west Iran): an evidence of intra-oceanic subduction

Compositional and Sr‐Nd isotopic features of the Xiejiayao ophiolite in the North Qilian Orogenic Belt, NW China: Implications for the petrogenesis and tectonic setting

Relationship between Fe-Cu-REEs mineralization and magnetic basement faults using multifractal modeling in Tarom region, NW Iran

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