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Title
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A Jurassic volcanic passive margin in Iran and Turkey
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Type
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JournalPaper
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Keywords
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Jurassic magmatism; Iran; Turkey
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Abstract
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Broadly similar Early to Middle Jurassic stratigraphic sequences including bimodal igneous rocks of the Sanandaj–Sirjan Zone of Iran and the Sakarya Zone of Turkey suggest that these formed in a common tectonic setting in an extensional basin that evolved from a terrestrial magmatic rift to a marine shelf and passive continental mar- gin. Whole-rock chemistry and Sr–Nd isotope signatures indicate derivation of mafic melts from partial melting of the subcontinental lithosphere. Decompression associ- ated with extension led to 5%–30% partial melting of spinel–garnet lherzolite with minor involvement of continental crust, producing tholeiitic to transitional basaltic magma. Extensional basins inverted during the Mid-Late Jurassic. These relationships suggest the Early to Middle Jurassic formation of a volcanic rifted margin on the SW Eurasian margin, similar to that of offshore Norway.
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Researchers
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Orhan Karsli (Fourth Researcher), Raif Kandemir (Third Researcher), Robert J. Stern (Second Researcher), Hossein Azizi (First Researcher)
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