A Jurassic volcanic passive margin in Iran and Turkey

IF 2.2 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Terra Nova Pub Date : 2022-12-02 DOI:10.1111/ter.12638
H. Azizi, R. Stern, Raif Kandemir, O. Karslı
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引用次数: 4

Abstract

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 margin. Whole‐rock chemistry and Sr–Nd isotope signatures indicate derivation of mafic melts from partial melting of the subcontinental lithosphere. Decompression associated 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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伊朗和土耳其侏罗纪火山被动边缘
广泛相似的早侏罗世至中侏罗世地层序列,包括伊朗Sanandaj–Sirjan带和土耳其Sakarya带的双峰火成岩,表明这些岩石形成于从陆地岩浆裂谷演化为海洋陆架和被动大陆边缘的伸展盆地的共同构造环境中。全岩化学和Sr–Nd同位素特征表明镁铁质熔体来源于次大陆岩石圈的部分熔融。与伸展相关的减压导致尖晶石-石榴石二辉橄榄岩的5%-30%部分熔融,与大陆地壳的少量接触,产生拉斑玄武岩至过渡玄武岩岩浆。侏罗纪中晚期倒转的伸展盆地。这些关系表明,早侏罗世至中侏罗世在欧亚大陆西南边缘形成了火山裂谷边缘,类似于挪威近海。
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来源期刊
Terra Nova
Terra Nova 地学-地球科学综合
CiteScore
4.80
自引率
8.30%
发文量
59
审稿时长
2.3 months
期刊介绍: Terra Nova publishes short, innovative and provocative papers of interest to a wide readership and covering the broadest spectrum of the Solid Earth and Planetary Sciences. Terra Nova encompasses geology, geophysics and geochemistry, and extends to the fluid envelopes (atmosphere, ocean, environment) whenever coupling with the Solid Earth is involved.
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