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首页> 外文期刊>Journal of Asian earth sciences >A case study of compression to escape tectonic transition: Tectonic evolution of the Nallihan Wedge and comparison with the Tercan Wedge (Eastern Mediterranean, Turkey)
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A case study of compression to escape tectonic transition: Tectonic evolution of the Nallihan Wedge and comparison with the Tercan Wedge (Eastern Mediterranean, Turkey)

机译：压缩以逃脱构造过渡的案例研究：纳利汉楔的构造演化及与特坎楔的比较（东地中海，土耳其）

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The Nallihan and Carrhan regions in western Anatolia host the stratigraphically and tectonically important features of Nallihan Wedge. The stratigraphic relationships and structural architecture of the wedge are not well understood, which are essential for better understanding of the timing and tectonic evolution of western Anatolia. Today, the Nallihan Wedge is bounded by the North Anatolian Fault and the Thrace-Eskisehir Fault in the northwest and southwest, respectively. The existence of Dagkuplu Melange within the wedge represents the closure of the Izmir-Ankara Ocean. The occurrence of the Lower Jurassic shelf, slope, reef and deep sea successions transitioning upward into the Cretaceous shelf and slope successions represent the opening and closing cycles of the Intra-Pontide Ocean. The tight and asymmetric folds (steep in the west, gentle in the east) within this stratigraphic sequence and the development of the Eocene units reflect the closure of the Intra-Pontide and izmir-Ankara oceans. The geometric structure and evolution of the Nallihan Wedge is directly related to the final continental collision. W-E and SW-NE striking large-scale oblique thrusts also exhibit notable strike-slip components within the study area. The principal direction of the fold axes are W-E and WNW-ESE oriented for the Eocene and Neogene units. During the Eocene, the depositional environment of the study area was a ramp basin mainly dominated by a braided river, when a portion of the Intra-Pontide Ocean was situated on the northern side of the study area. The compressional tectonic regime continued to the end of the Oligocene, which is followed by a new tectonic regime during the Miocene, when the triangular shape region between the Thrace Eskisehir Fault and the North Anatolian Fault developed as an intermontane basin. The evolution of this basin can be compared with the Tercan Wedge, bordered by the North Eastern Anatolian Fault and the North Anatolian Fault.In the Nallihan and Cayirhan regions the N-S-trending compressional regime started during the Upper Cretaceous and continued until the final continental collisional during the Upper Eocene. The compressional structures in the area became reactivated during the post-collisional escape tectonic phase in western Anatolia, leading to the development of the prominent Isparta Angle during the Miocene. During this period, the Thrace Eskisehir Fault and Burdur-Fethiye Shear Zone also formed as intracontinental transform fault zones in western Anatolia. The Nallihan Wedge started to form in a wedge-shaped area between the Thrace-Eskisehir Fault and the zone of strike-slip faults with thrust component that later developed into the North Anatolian Fault. Thus, Eocene and pre-Eocene structures obtain strike-slip component by an inversion during the Miocene. During and post Pliocene, the Thrace-Eskisehir Fault lost its tectonic activity as the North Anatolian Fault propagated westward into the region previously controlled by the Thrace-Eskisehir Fault. During this interval the Nallihan Wedge entered a new stage of deformation, which is also observed today.
机译：安纳托利亚西部的纳利汉和卡尔汉地区具有纳利汉楔的地层和构造上的重要特征。楔形岩的地层关系和结构构造尚未得到很好的理解，这对于更好地了解西安纳托利亚的时间和构造演化至关重要。如今，纳利汉楔地带分别由西北和西南的安那托利亚北断裂和色雷斯-埃斯基谢希尔断裂构成。楔形物内Dagkuplu Melange的存在代表了伊兹密尔-安卡拉海洋的封闭。下侏罗纪陆架，斜坡，礁石和深海演替的发生向上过渡到白垩纪陆架和斜坡演替代表了nt内大洋的打开和关闭周期。在这一地层层序中，紧密而不对称的褶皱（西部陡峭，东部柔和），始新世单元的发育反映了蓬内德海峡和伊兹密尔-安卡拉海洋的封闭。 Nallihan Wedge的几何结构和演化与最终的大陆碰撞直接相关。 W-E和SW-NE的大斜推力在研究区域内也表现出明显的走滑分量。对于始新世和新近纪单元，折叠轴的主要方向是W-E和WNW-ESE。在始新世期间，研究区的沉积环境是一个主要由辫状河支配的斜坡盆地，当时部分庞特德海位于研究区的北侧。压变构造政体一直持续到渐新世末期，随后在中新世期间出现了新的构造政体，当时色雷斯埃斯基谢希尔断裂与北安那托利亚断裂之间的三角形区域发展为山间盆地。该盆地的演化可以与以东北安那托利亚断层和北安那托利亚断层为边界的Tercan楔相提并论。在纳利汗和卡伊尔汗地区，NS趋势压缩态始于上白垩纪，一直持续到最后的大陆碰撞。在上始新世。该地区的受压结构在安那托利亚西部的碰撞后逃逸构造阶段被重新激活，从而导致了中新世时期突出的伊斯巴达角的发育。在此期间，色雷斯埃斯基谢希尔断裂和Burdur-Fethiye剪切带也形成了安那托利亚西部的陆内转换断裂带。 Nallihan楔开始在Thrace-Eskisehir断层和具有推力分量的走滑断层带之间的楔形区域中形成，后来又发展为北安那托利亚断层。因此，始新世和始新世构造通过中新世反演获得走滑分量。在上新世期间和之后，色雷斯-埃斯基谢希尔断裂失去了构造活动，因为北安纳托利亚断裂向西传播到先前由色雷斯-埃斯基谢希尔断裂控制的地区。在这段时间里，纳利汉楔进入了变形的新阶段，今天也可以观察到。

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