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首页> 外文期刊>Journal of Asian earth sciences >Middle Permian-early Triassic magmatism in the Western Pontides, NW Turkey: Geodynamic significance for the evolution of the Paleo-Tethys
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Middle Permian-early Triassic magmatism in the Western Pontides, NW Turkey: Geodynamic significance for the evolution of the Paleo-Tethys

机译：土耳其西北部中部二叠纪-早三叠世岩浆作用：古特提斯演化的地球动力学意义

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摘要

Permian-Triassic magmatic rocks are widely exposed in different tectonic terranes and continental blocks in the Aegean region. This study is focussed on the İstanbul Zone and the Istranca (Strandja) Massif, which are located in the Western Pontides of NW Turkey. The Kırklareli and the Tepecik plutons intruded into the metamorphic basement rocks of the Istranca Massif, and the Sancaktepe pluton is emplaced into the İstanbul Paleozoic sedimentary sequences. We present new geochemical data for these plutons, in order to interpret their petrogenesis and time of emplacement and use this information for geodynamic interpretation. The zircon U–Pb crystallization ages are 268.3 ± 2.1 Ma for the Kırklareli pluton, 249.4 ± 1.5 Ma for the Tepecik pluton and 257.3 ± 1.5 Ma and 253.7 ± 1.75 Ma for the the Sancaktepe pluton. They are high-K, calc-alkaline to shoshonitic granitoids with aluminum saturation index (ASI) values between 0.9 and 1.3, which define them as peraluminous and slightly metaluminous.87Sr/86Sr(i)values for the studied plutons range between 0.701123 and 0.707704.143Nd/144Nd(i)ratios calculated for crystallization ages are between 0.512052 and 0.512431, and εNd(i)values vary from −4.71 to 2.22. TDMmodel ages range between 0.83 and 1.41 Ga. These plutons are enriched in LILEs and LREE and depleted in HFSEs with negative Eu anomalies, indicating that the melts were derived from mafic crustal sources. Our new data suggest that the Kırklareli pluton was generated in a subduction-related magmatic arc, and the highly fractionated Sancaktepe and Tepecik plutons were formed in a back-arc setting in response to the northward subduction of the Paleo-Tethys Ocean during the Mid Permian–Early Triassic.
机译：二叠纪-三叠纪岩浆岩广泛分布在爱琴海地区的不同构造地层和大陆块中。这项研究的重点是位于土耳其西北部西蓬德群岛的伊斯坦布尔地区和伊斯特拉卡（Strandja）地块。 Kırklareli和Tepecik岩体侵入了Istranca Massif的变质基底岩中，而Sancaktepe岩体被置于伊斯坦布尔古生代沉积层序中。我们介绍了这些云母的新地球化学数据，以便解释其成因和沉积时间，并将这些信息用于地球动力学解释。克尔克拉雷利岩体的锆石U-Pb结晶年龄为268.3±2.1 Ma，Tepecik岩体的锆石U-Pb结晶年龄为249.4±1.5 Ma，Sancaktepe岩体的锆石U-Pb结晶年龄为257.3±1.5 Ma和253.7±1.75 Ma。它们是高K值，钙碱性的shoshonitic花岗岩，铝饱和指数（ASI）值在0.9和1.3之间，定义为高铝和轻金属。被研究的胶体的87Sr / 86Sr（i）值范围在0.701123和0.707704之间计算的结晶年龄的.143Nd / 144Nd（i）比率在0.512052和0.512431之间，并且εNd（i）值在-4.71到2.22之间变化。 TDM模型的年龄介于0.83和1.41 Ga之间，这些p体富含LILE和LREE，而EuSE异常为负的HFSE中贫乏，这表明这些熔体来自镁铁质地壳源。我们的新数据表明，Kırklareli岩体是在俯冲相关的岩浆弧中产生的，而高分馏的Sancaktepe和Tepecik岩体是在二叠纪中期对古特提斯海洋向北俯冲的后弧环境中形成的–早期三叠纪。

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