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首页> 外文期刊>Geodinamica Acta >Zircon ages from the Beypazar? granitoid pluton (north central Turkey): tectonic implications
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Zircon ages from the Beypazar? granitoid pluton (north central Turkey): tectonic implications

机译：锆石从Beypazar变老了吗？花岗岩类岩体（土耳其中北部）：构造意义

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摘要

The Beypazar? granitoid is emplaced in a Late Cretaceous volcanic arc in north central Turkey and provides evidence for processes that occurred during the closure of the Neo-Tethys Ocean. Zircons from its northern granodiorite and quartz monzonite exposure are dated in rock thin section and display characteristic igneous zoning in cathodoluminescence (CL). Its oldest Late Cretaceous ages (95.4 ± 4.2–91.3 ± 6.5 Ma, ~(238)U/~(206)Pb, ±1σ) time early crystallization from rising melts, but inspection of the youngest grains in composite CL–secondary electron images shows they are located along grain boundaries surrounded by alteration textures and were possibly affected by fluid-driven metamorphism. Ages obtained from zircon mid-rims (82.7 ± 6.0–70.5 ± 3.4 Ma) record continuous crystallization of the pluton. Here, we model the Late Cretaceous development of the Beypazar? granitoid wherein subduction of Neo-Tethyan oceanic plate, multiple injections and mixing of magma, and crustal contribution during ascent are the cause of geochemical heterogeneities within the pluton and account for protracted zircon crystallization. The model speculates that the pluton is in the overriding tectonic plate of a series of stacked, north-dipping subduction zones that record the closure of Neo-Tethyan ocean basins during the geologic assembly of Turkey.
机译：Beypazar？花岗岩位于土耳其中北部的晚白垩纪火山弧中，为新特提斯海洋封闭期间发生的过程提供了证据。其北部花岗闪长岩和石英蒙脱石暴露的锆石在岩石薄片中注明年代，并在阴极发光（CL）中显示出特征性的火成岩带。其最古老的白垩纪年龄（95.4±4.2–91.3±6.5 Ma，〜（238）U /〜（206）Pb，±1σ）时间是从上升的熔体中早期结晶的时间，但是在复合CL二次电子图像中检查了最小的晶粒结果表明它们位于被蚀变纹理包围的晶界上，并可能受到了流体驱动的变质作用的影响。从锆石中缘（82.7±6.0–70.5±3.4 Ma）获得的年龄记录了岩钉的连续结晶。在这里，我们对Beypazar的晚白垩纪发育进行了建模？花岗岩，其中新特提斯洋洋板块的俯冲，岩浆的多次注入和混合以及上升过程中的地壳贡献是岩体内部地球化学非均质性的原因，并解释了锆石长时间结晶。该模型推测，该岩体位于一系列堆积的北倾俯冲带的上覆构造板块中，这些俯冲带记录了土耳其地质大会期间新特提斯洋盆关闭的情况。

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