ABSTRACT Spatially continuous rock assemblages that share similar environmental evolution or structural features can be classified as a single tectonic unit. This approach enables to link dispersed units or massifs with each other and sometimes can be subjective, depending on the classification criteria. The relationship and the nature of the contact between the Strandja Massif and the İstanbul Zone have been controversial due to the Cainozoic cover. Amalgamation of these units was claimed as early as the Aptian-Albian. Lower Triassic sedimentary rocks, which are overlain by the Carboniferous flysch with a N-verging thrust fault are exposed NW of the İstanbul Zone. This study reveals the spatial relationship between the Strandja Massif and the İstanbul Zone deduced from the U-Pb dating and Lu-Hf isotopes of the detrital zircons from these Lower Triassic clastics. Our results show that the early Triassic basin was fed from a provenance that included arc-related Upper Carboniferous-Lower Permian magmatic rocks which is much more likely to be the Strandja Massif than the İstanbul Zone. The second outcome of this study is that a unit that previously assigned to Palaeozoic turned out to be Triassic, which brings the Strandja Massif farther to the east, into the northern İstanbul Zone.

中文翻译：

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Strandja Massif 和 İstanbul 带曾经是同一古构造单元的一部分：来自三叠纪碎屑锆石的新数据

摘要具有相似环境演化或结构特征的空间连续岩石组合可以归类为单个构造单元。这种方法可以将分散的单元或地块相互联系起来，有时可能是主观的，具体取决于分类标准。由于新生代覆盖，Strandja 地块和伊斯坦布尔带之间的关系和接触的性质一直存在争议。这些单位的合并早在阿普提安-阿尔比安时期就有人声称。下三叠统沉积岩被石炭纪复理石覆盖，具有 N 向逆冲断层，在伊斯坦布尔带的 NW 出露。这项研究揭示了从这些下三叠统碎屑岩碎屑锆石的 U-Pb 定年和 Lu-Hf 同位素推导出的 Strandja 地块和伊斯坦布尔带之间的空间关系。我们的研究结果表明，早三叠世盆地的物源包括与弧相关的上石炭纪-下二叠纪岩浆岩，与伊斯坦布尔带相比，该岩浆岩更有可能是 Strandja 地块。这项研究的第二个结果是，先前被指定为古生代的一个单元变成了三叠纪，这使 Strandja 地块向东更远，进入伊斯坦布尔北部区域。我们的结果表明，早三叠世盆地的物源包括与弧相关的上石炭纪-下二叠纪岩浆岩，与伊斯坦布尔带相比，该岩浆岩更有可能是 Strandja 地块。这项研究的第二个结果是，先前被指定为古生代的一个单元变成了三叠纪，这使 Strandja 地块向东更远，进入伊斯坦布尔北部区域。我们的研究结果表明，早三叠世盆地的物源包括与弧相关的上石炭纪-下二叠纪岩浆岩，与伊斯坦布尔带相比，该岩浆岩更有可能是 Strandja 地块。这项研究的第二个结果是，先前被指定为古生代的一个单元变成了三叠纪，这使 Strandja 地块向东更远，进入伊斯坦布尔北部区域。