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首页> 外文期刊>Journal of Asian earth sciences >The Arkot Dag Melange in Arac. area, central Turkey: Evidence of its origin within the geodynamic evolution of the Intra-Pontide suture zone
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The Arkot Dag Melange in Arac. area, central Turkey: Evidence of its origin within the geodynamic evolution of the Intra-Pontide suture zone

机译：阿拉克的Arkot Dag杂种。土耳其中部地区：其起源于within内缝合带地球动力学演化的证据

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In northern Turkey, the Intra-Pontide suture zone is represented by an east-west trending belt of deformed and/or metamorphic units located at the boundary between the Istanbul-Zonguldak terrane to the north and the Sakarya terrane to the south. These units can be regarded as issued from the Intra-Pontide domain, whose geodynamic history is still a matter of debate. Along the Akpinar-Arac-Bayramoren geotraverse, located in central Turkey, an ophiolite-bearing melange known as the Arkot Da| Melange, is well-exposed along the Intra-Pontide suture zone. The Arkot Dag Melange plays a key role in the interpretation of the geodynamic history of the Intra-Pontide domain and can be described as a Late Santonian chaotic sedimentary deposit consisting of an up to 1000-m-thick succession of slide-blocks of different sizes and lithologies enclosed in a sedimentary matrix consisting of shales, coarse-grained arenites, pebbly mudstones and pebbly sandstones. The slide-blocks, from a few meters to hectometers in size, are represented by metamorphic rocks (mainly micaschists and gneisses), by ophiolites (peridotites, gabbros, IAT and BABB basalts and cherts) and by sedimentary rocks (cherts, neritic and pelagic limestone, marly limestone and ophiolite-bearing turbidites). The youngest age among the slide-blocks has been provided by the ophiolite-bearing turbidites where a late Coniacian nannofossil assemblage has been found. The cherts have provided a wide range of ages from the Middle Triassic to Late Cretaceous, whereas the fossils found in the limestone indicate Late Jurassic to Early Cretaceous ages. The matrix of the Arkot Dag Melange, even if unaffected by meta-morphism, shows deformations represented by multiple meters-thick cataclastic shear zones at the boundaries of the melange slices or inside of them. According to its features, the source area of the Arkot Dag Melange was most likely a continental and oceanic thrust sheet emplaced in the Late Cretaceous onto a continental margin. The data collected from the different slide-blocks suggest that the Intra-Pontide domain was characterised by an oceanic basin opened at the latest in the Early Jurassic. The opening of the Intra-Pontide oceanic basin was followed by the development of a subduction zone with a subsequent opening of suprasubduction oceanic basin in the Middle Jurassic-Early Cretaceous. The convergence in this suprasubduction oceanic basin started at the Early/Late Cretaceous boundary by an obduction process, whereas its final closure can be regarded as Late Paleocene in age.
机译：在土耳其北部，庞特德内缝合带以东西向的变形和/或变质单元趋势带为代表，位于北部的伊斯坦堡-宗古达克地区与南部的萨卡里亚地区之间的边界。这些单元可以被认为是从庞特内域发布的，该域的地球动力学历史仍是一个有争议的问题。沿着位于土耳其中部的Akpinar-Arac-Bayramoren地理遍历，一种含蛇绿岩的混杂岩被称为Arkot Da |。混杂物沿Po内缝合线区暴露在外。 Arkot Dag Melange在解释庞特内域的地球动力学历史中起着关键作用，可以描述为晚期桑顿混沌沉积沉积物，包括多达1000米厚的不同大小的滑动块序包括在由页岩，粗粒贝尼特，卵石泥岩和卵石砂岩组成的沉积基质中的岩性。滑块的大小从几米到几百厘米不等，由变质岩（主要是云母岩和片麻岩），透闪石（橄榄岩，辉长岩，IAT和BABB玄武岩和and石）和沉积岩（（石，软岩和中上层岩）代表。石灰石，灰泥灰岩和含蛇绿岩的浊石）。滑石中最年轻的年龄是由含蛇绿岩的混浊剂提供的，那里发现了晚柯尼西亚人的化石组合。 cher石提供了从中三叠纪到白垩纪晚期的广泛年龄，而在石灰石中发现的化石则表明了侏罗纪晚期至白垩纪早期。 Arkot Dag Melange的矩阵即使不受变质作用的影响，也显示出由混杂层边界或其内部的数米厚的碎裂剪切带代表的变形。根据其特征，Arkot Dag Melange的源区很可能是在白垩纪晚期放置到大陆边缘的大陆和海洋逆冲板。从不同滑动块收集的数据表明，Po内域的特征是最晚在侏罗纪早期开放的海盆。 -邦大洋盆开放后，形成了俯冲带，随后在侏罗纪-早白垩世开始了俯冲洋盆开放。该超俯冲海洋盆地的收敛始于白垩纪早/晚边界，发生了一次俯冲过程，而最后的封闭可看作是年龄上的古新世晚期。

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