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首页> 外文期刊>Contributions to Mineralogy and Petrology >From Jurassic rifting to Cretaceous subduction in NW Iranian Azerbaijan: geochronological and geochemical signals from granitoids
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From Jurassic rifting to Cretaceous subduction in NW Iranian Azerbaijan: geochronological and geochemical signals from granitoids

机译：从NW伊朗阿塞拜疆的侏罗纪散步到白垩纪俯冲：来自花岗岩的地理学和地球化学信号

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摘要

Previous interpretations of a Jurassic subduction in Iran were based on trace element classification diagrams for granitoids, but their reliability is questionable, underscored by modern examples of continental break-up zones such as the Baja California. We present new field observations, bulk rock geochemistry, Sr and Nd isotope analyses and U-Pb zircon geochronology to assess the age and tectonic setting of previously undated intermediate to felsic magmatic rocks cropping out in the Precambrian basement of NW Iranian Azerbaijan. The geochronology revealed an uneven distribution in space and time: Late Jurassic (159-154Ma) intrusions and dikes are alkaline to calc-alkaline. Their melt source is mantle dominated with a distinct continental contribution disclosed by radiogenic isotopes and abundant inherited zircon cores. Mid-Cretaceous (112-96Ma) plutonic bodies and associated volcanic rocks occur only to the east of the major Siah Cheshmeh-Khoy Fault. They have geochemical signatures typical of a metasomatized mantle. In consistence with the sedimentation history of the area, our new interpretation attributes the Late Jurassic magmatism to thinning of a continental lithosphere in a rift-related setting. Mid-Cretaceous magmatism was produced by oceanic subduction beneath the Central Iran continent. We interpret the 40-Ma age gap between the two magmatic episodes as the time of opening of the oceanic basin witnessed by the Khoy ophiolite in the study area.
机译：以前对伊朗的侏罗纪介绍的解释是基于痕量的花岗岩分类图，但它们的可靠性是值得怀疑的，不受欢迎的大陆分手区，如Baja California。我们展示了新的田间观测，散装岩地球化学，SR和ND同位素分析和U-PB锆石地理学，以评估先前未在NW伊朗阿塞拜疆的Predambrian地下室播种的前期中间的年龄和构造环境。地理学揭示了空间和时间不均匀的分布：侏罗纪晚期（159-154mA）入侵和堤防是碱性至钙碱。它们的熔体来源是由辐射同位素和丰富的继承的锆石核心公开的不同的大陆贡献。中白垩纪（112-96MA）振振体和相关的火山岩仅发生在主要的SIAH Cheshmeh-Khoy断层的东部。它们具有典型的地球化学签名，典型的弥扑地幔。在与该地区的沉降历史一致的一致中，我们的新诠释将晚期侏罗纪岩浆广告归因于裂谷相关环境中的大陆岩石圈。中间白垩纪的岩浆主义是由伊朗中部大陆下的海洋俯射产生的。我们将两个岩石剧集之间的40米年龄差距解释为在研究区域中Khoy ophiolite目睹的海洋盆地的开放时间。

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