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首页> 外文期刊>Tectonophysics: International Journal of Geotectonics and the Geology and Physics of the Interior of the Earth >Tectonic evolution of the intra-pontide suture zone in the Armutlu Peninsula, NW turkey
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Tectonic evolution of the intra-pontide suture zone in the Armutlu Peninsula, NW turkey

机译：土耳其西北部阿鲁特鲁半岛的-内缝合带的构造演化

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The Armutlu Peninsula and adjacent areas in NW Turkey play a critical role in tectonic reconstructions of the southern margin of Eurasia in NW Turkey. This region includes an inferred Intra-Pontide oceanic basin that rifted from Eurasia in Early Mesozoic time and closed by Late Cretaceous time. The Armutlu Peninsula is divisible into two metamorphic units. The first, the Armutlu Metamorphics, comprises a ?Precambrian high-grade metamorphic basement, unconformably overlain by a ?Palaeozoic low-grade, mixed siliciclastic/carbonate/volcanogenic succession, including bimodal volcanics of inferred extensional origin, with a possibly inherited subduction signature. The second unit, the low-grade Iznik Metamorphics, is interpreted as a Triassic rift infilled with terrigenous, calcareous and volcanogenic lithologies, including basalts of within-plate type. The Triassic rift was unconformably overlain by a subsiding Jurassic-Late Cretaceous (Cenomanian) passive margin including siliciclastic/carbonate turbidites, radiolarian cherts and manganese deposits. The margin later collapsed to form a flexural foredeep associated with the emplacement of ophiolitic rocks in Turonian time. Geochemical evidence from meta-basalt blocks within ophiolite-derived melange suggests a supra-subduction zone origin for the ophiolite. The above major tectonic units of the Armutlu Peninsula were sealed by a Maastrichtian unconformity. Comparative evidence comes from the separate Almacik Flake further cast. Considering alternatives, it is concluded that a Mesozoic Intra-Pontide oceanic basin separated Eurasia from a Sakarya microcontinent, with a wider Northern Neotethys to the south. Lateral displacement of exotic terranes along the south-Eurasian continental margin probably also played a role, e.g. during Late Cretaceous suturing, in addition to overthrusting. (C) 2004 Elsevier B.V. All rights reserved. [References: 57]
机译：土耳其西北部的Armutlu半岛及邻近地区在土耳其西北部欧亚大陆南缘的构造重建中起着关键作用。该区域包括一个推断的-内大洋盆地，该洋盆在中生代早期从欧亚大陆裂开，并在白垩纪晚期封闭。 Armutlu半岛可分为两个变质单元。第一个是Armutlu变质，包括一个前寒武纪高级变质基底，被古生代低级，混合的硅质碎屑岩/碳酸盐岩/火山成因演替（包括推断的伸展起源的双峰火山岩）一致地覆盖，并可能带有继承的俯冲特征。第二个单元，低品位的伊兹尼克变质，被解释为三叠纪裂谷，充满了陆源，钙质和火山成岩，包括板内玄武岩。三叠纪裂谷不整合地覆盖着侏罗纪晚期白垩纪（切诺曼尼亚）的被动边缘，包括硅质碎屑/碳酸盐浊度，放射虫的硅质ts石和锰矿床。边缘随后坍塌，形成了弯曲的前深部，与土伦时代的脂石岩的侵入有关。来自蛇绿岩衍生的混杂岩中偏玄武岩块的地球化学证据表明，蛇绿岩的超俯冲带起源。 Armutlu半岛的上述主要构造单元被马斯特里赫特不整合面密封。比较证据来自单独的Almacik Flake进一步演员表。考虑替代方案，得出的结论是，中生代庞特内大洋盆地将欧亚大陆与萨卡里亚微大陆分隔开来，南部更广的北部新特提斯。沿南欧亚大陆边缘的外来地形的横向位移可能也起了一定作用，例如在白垩纪晚期缝合期间，除了过度推覆。 （C）2004 Elsevier B.V.保留所有权利。 [参考：57]

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