Geochemistry and petrogenesis of Ghezelhesar Quaternary alkali olivine basalt flows (NE Hamedan, Iran)
The Ghezelhesar alkali olivine basalt flows as dark horizontal flows with about 20 m thickness covered the Quaternary deposits, 2 km southwest of Ghezelhesar village, 60 km northeast of Hamedan and in the Sanandaj-Sirjan geological and tectonic zone. The phenocrysts of these rocks are olivine and cl...
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University of Isfahan
2021-01-01
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| Series: | پترولوژی |
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| Online Access: | https://ijp.ui.ac.ir/article_25421_25d67434b0fe51a823666a42c2bdd49a.pdf |
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| author | Fatemeh Salar Beyrami; Hossein Shahbazi Maryam Ghobadnam; |
| author_facet | Fatemeh Salar Beyrami; Hossein Shahbazi Maryam Ghobadnam; |
| author_sort | Fatemeh Salar Beyrami; |
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| description | The Ghezelhesar alkali olivine basalt flows as dark horizontal flows with about 20 m thickness covered the Quaternary deposits, 2 km southwest of Ghezelhesar village, 60 km northeast of Hamedan and in the Sanandaj-Sirjan geological and tectonic zone. The phenocrysts of these rocks are olivine and clinopyroxene often as euhedral crystals and common porphyritic, vitrophyritic and glomeroporphyric textures. The matrix of the rocks studied formed from volcanic glass, leucite, nepheline and microliths of pyroxene. The Ghezelhesar basalts, with continental within plate alkaline nature, are silica-under saturated and characterized by normative minerals of Diopside, Hematite, Anorthite, Albite, Orthoclase, ±Hypersthene, ±Olivine, ±Nepheline, and ±Quartz. REE normalized patterns show enrichment in LREEs rather than HREEs and fractionation between LREE and HREE is relatively high (LaN/YbN = 37.05–43.43). A negative anomaly in High Field Strength Elements (Nb, Ta, Zr, Ti, P, and Rb) and positive anomaly in Large Ion Lithophile Elements (i.e. Ba, Pb) and elements such as Th, La, Ce, Nd, and Sm are remarkable geochemical features of the rocks under study. These criteria along with parameters of their trace elements such as the ∆Nb indicate that the parent magma of the rocks under investigation derived from the low-grade degree partial melting of an enriched garnet-mantle, and the fractional crystallization has affected their chemical properties. |
| first_indexed | 2024-03-12T04:30:37Z |
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| last_indexed | 2024-03-12T04:30:37Z |
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| spelling | doaj.art-47b5d5f5c5444209b3a7de432952ea042023-09-03T10:06:26ZfasUniversity of Isfahanپترولوژی2228-52102322-21822021-01-01114759010.22108/ijp.2021.124136.119525421Geochemistry and petrogenesis of Ghezelhesar Quaternary alkali olivine basalt flows (NE Hamedan, Iran)Fatemeh Salar Beyrami;0Hossein Shahbazi1Maryam Ghobadnam;2Department of Geology, Faculty of sciences, Bu-Ali Sina University, Hamedan, IranDepartment of Geology, Faculty of Sciences, Bu Ali Sina University , Hamedan, IranDepartment of Geology, Faculty of sciences, Bu-Ali Sina University, Hamedan, IranThe Ghezelhesar alkali olivine basalt flows as dark horizontal flows with about 20 m thickness covered the Quaternary deposits, 2 km southwest of Ghezelhesar village, 60 km northeast of Hamedan and in the Sanandaj-Sirjan geological and tectonic zone. The phenocrysts of these rocks are olivine and clinopyroxene often as euhedral crystals and common porphyritic, vitrophyritic and glomeroporphyric textures. The matrix of the rocks studied formed from volcanic glass, leucite, nepheline and microliths of pyroxene. The Ghezelhesar basalts, with continental within plate alkaline nature, are silica-under saturated and characterized by normative minerals of Diopside, Hematite, Anorthite, Albite, Orthoclase, ±Hypersthene, ±Olivine, ±Nepheline, and ±Quartz. REE normalized patterns show enrichment in LREEs rather than HREEs and fractionation between LREE and HREE is relatively high (LaN/YbN = 37.05–43.43). A negative anomaly in High Field Strength Elements (Nb, Ta, Zr, Ti, P, and Rb) and positive anomaly in Large Ion Lithophile Elements (i.e. Ba, Pb) and elements such as Th, La, Ce, Nd, and Sm are remarkable geochemical features of the rocks under study. These criteria along with parameters of their trace elements such as the ∆Nb indicate that the parent magma of the rocks under investigation derived from the low-grade degree partial melting of an enriched garnet-mantle, and the fractional crystallization has affected their chemical properties.https://ijp.ui.ac.ir/article_25421_25d67434b0fe51a823666a42c2bdd49a.pdfalkali basaltsilica-under saturatedpartial meltingghezelhesarhamedansanandaj-sirjan zone |
| spellingShingle | Fatemeh Salar Beyrami; Hossein Shahbazi Maryam Ghobadnam; Geochemistry and petrogenesis of Ghezelhesar Quaternary alkali olivine basalt flows (NE Hamedan, Iran) پترولوژی alkali basalt silica-under saturated partial melting ghezelhesar hamedan sanandaj-sirjan zone |
| title | Geochemistry and petrogenesis of
Ghezelhesar Quaternary alkali olivine basalt flows
(NE Hamedan, Iran) |
| title_full | Geochemistry and petrogenesis of
Ghezelhesar Quaternary alkali olivine basalt flows
(NE Hamedan, Iran) |
| title_fullStr | Geochemistry and petrogenesis of
Ghezelhesar Quaternary alkali olivine basalt flows
(NE Hamedan, Iran) |
| title_full_unstemmed | Geochemistry and petrogenesis of
Ghezelhesar Quaternary alkali olivine basalt flows
(NE Hamedan, Iran) |
| title_short | Geochemistry and petrogenesis of
Ghezelhesar Quaternary alkali olivine basalt flows
(NE Hamedan, Iran) |
| title_sort | geochemistry and petrogenesis of ghezelhesar quaternary alkali olivine basalt flows ne hamedan iran |
| topic | alkali basalt silica-under saturated partial melting ghezelhesar hamedan sanandaj-sirjan zone |
| url | https://ijp.ui.ac.ir/article_25421_25d67434b0fe51a823666a42c2bdd49a.pdf |
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