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首页> 外文期刊>Geodinamica Acta >Evidence for the reactivation of a pre-existing zone of weakness and its contributions to the evolution of the Kü?ük Menderes Graben: a study on the Ephesus Fault, Western Anatolia, Turkey
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Evidence for the reactivation of a pre-existing zone of weakness and its contributions to the evolution of the Kü?ük Menderes Graben: a study on the Ephesus Fault, Western Anatolia, Turkey

机译：重新激活先前存在的弱点区域及其对库克·穆德雷斯·格拉本（Kü？ükMenderes Graben）演变的贡献的证据：土耳其以西弗纳斯地区以弗所断层的研究

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Detailed geological mapping at the western end of the Kü?ük Menderes Graben (KMG) in western Turkey reveals two main sedimentary packages separated by a regional unconformity: (1) Miocene units and (2) KMG basin-fill deposits of Quaternary age. The older basin-fill is represented by colluvial/alluvial fan facies association, which was controlled by a NW–SE-trending and SW-facing dip-slip normal fault (the Ortaburun Fault) and the conformably overlying fluvial and lacustrine deposits. The younger basin-fill, besides being characterised by lateral colluvial fan and axial river sediments deposited under the control of the Ephesus Fault, a southern basin-margin fault character, is also responsible for the evolution of the modern KMG. The analysis of structural, stratigraphic and sedimentological data indicates that three different deformation phases dominated during the Miocene to Recent time in the region: (i) during Early–Middle Miocene Phase 1 deformation (D_(1)), the NW–SE-trending Ephesus Fault moved as a left-lateral strike-slip fault and occurred within the NE–SW-trending dextral shear zone of the ?zmir-Bal?kesir Transfer Zone (?BTZ) time; (ii) Middle Miocene Phase 2 deformation (D_(2)) was associated with Ortaburun Fault, the northern basin-margin fault of the ancient basin. During this phase, the sinistral Ephesus Fault was reactivated as a dip-slip normal fau and (iii) Phase 3 deformation (D_(3)) was related with the formation of the KMG during the Quaternary and the Ephesus Fault forms the southern margin of the modern KMG. Structural evidence and computed palaeostress results show that the main extension direction during phase 1 and phase 3 has changed from north-west to north-east direction. This further suggests an approximately 60° rotation around the vertical axes and is attributed to the fact the region lies within the strike-slip dominated ?BTZ.
机译：在土耳其西部的库克（Kü？ükMenderes Graben）（KMG）西端进行了详细的地质测绘，揭示了两个主要的沉积包裹，它们被区域不整合所分隔：（1）中新世单元和（2）第四纪的KMG盆地填充沉积物。较早的盆地充填以冲积/冲积扇相相为代表，其由西北向东南走向和西南向倾斜滑动正常断层（奥塔布伦断层）以及上覆的河流和湖泊沉积物控制。较年轻的盆地填充物，除了以侧向冲积扇和轴向河流沉积物为特征外，在南部的盆地边缘断裂特征以弗所断裂的控制下，也是现代KMG演化的原因。对结构，地层和沉积学数据的分析表明，在该地区的中新世至最近时期，三个不同的变形阶段占主导地位：（i）中新世早期-中期第一阶段变形（D_（1）），西北-东南向以弗所断裂作为左旋走滑断裂运动，发生在？zmir-Bal？kesir转换区（？BTZ）时间的NE-SW趋势右旋剪切带内。 （ii）中新世中期2期变形（D_（2））与Ortaburun断层有关，Ortaburun断层是古代盆地的北部盆地边缘断层。在这个阶段，以太滑断层正断层被重新激活。 （iii）第三阶段变形（D_（3））与第四纪时期的国民党形成有关，而以弗所断裂形成了现代国民党的南缘。结构证据和计算的古应力结果表明，第1阶段和第3阶段的主要延伸方向已从西北方向改变为东北方向。这进一步表明绕垂直轴旋转了大约60°，这归因于该区域位于以走滑为主的ΔBTZ内。

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