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首页> 外文期刊>Journal of geodynamics >Extension of Hellenic forearc shear zones in SW Turkey: the Pliocene-Quaternary deformation of the Esen Cay Basin
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Extension of Hellenic forearc shear zones in SW Turkey: the Pliocene-Quaternary deformation of the Esen Cay Basin

机译：土耳其西南部希腊前臂剪切带的扩展：埃森岩盆地的上新世-第四纪变形

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The Pliocene-Quaternary Esen Cay Basin in southwestern Turkey has a key position in the southern Aegean to gain insight into both lateral and temporal changes in stresses exerted by plate convergence at the Hellenic-Cyprus arc junction. A tectonosedimentary study of the basin development in combination with a structural analysis helped to reveal internal basin deformation and adjacent basement kinematics in order to delineate 3D strain through time. In the Pliocene the basin originated as a fluviolacustrine basin situated in a depression related to a ramp-fold geometry in the Lycian nappe stack. During the late Pliocene, E-W extension caused the development of N-S normal faults, displacement along which caused the differentiation of the relief and deposition of local alluvial fan systems. The Pleistocene is also marked by widespread alluvial-fluvial sedimentation that is triggered by activity at 020° faults. This fault system resulted from WNW-ESE extension and caused disruption of the former basin floor by uplift and tilting of intrabasinal areas, which initiated development of new source areas for the fan sedimentation. The Holocene-Recent period is characterized by a complex combination of faults of which 070° sinistral strike-slip faults are the most important. Fault-slip analysis reveals that deformation occurred in transtension, explained by the addition of a sinistral shear component. This implies that stresses evolved from simple tensional to transtensional over the Pliocene-Quaternary period. The initial extension phase is explained by the kinematic effects of outward growth of the Hellenic forearc, comparable with observations from the island of Rhodes and the eastern Anaximander Mountains. The time-transgressive addition of a sinistral shear component was likely produced by the northeastward propagating transcurrent motions of forearc slivers sheared from the expanding forearc as has been previously inferred for Crete and Rhodes. The latter process is related to the incipient continental collision of an African promontory south of Crete. This implies a kinematic linkage between the studied domain in southwestern Turkey and the eastern Hellenic Arc.
机译：土耳其西南部的上新世-第四纪埃森礁盆地在爱琴海南部具有关键地位，可洞悉由希腊-塞浦路斯弧交汇处的板块汇聚所产生的应力的横向和时间变化。对盆地发育的构造沉积学研究与结构分析相结合，有助于揭示盆地内部变形和邻近的地下运动学，以便描绘出随时间变化的3D应变。在上新世，该盆地起源于一条氟湖相盆地，该盆地位于与利西亚岩浆叠中的斜坡褶皱几何形状有关的凹陷中。在上新世末期，E-W扩展引起了N-S正常断层的发展，其位移引起了局部冲积扇系统的浮雕和沉积的差异。更新世的特征还在于广泛的冲积河床沉积，这是由020°断层处的活动触发的。该断层系统是由WNW-ESE扩展引起的，并且由于基底内区域的隆起和倾斜而引起了前盆地底板的破坏，从而引发了新的扇形沉积物源区的开发。全新世时期的特征是断裂的复杂组合，其中最重要的是070°左旋走滑断裂。断层滑移分析表明，变形过程中发生了变形，这是通过增加一个左旋剪切分量来解释的。这意味着应力在上新世-第四纪期间从简单的张应力演变为张应力。初始伸展阶段是由希腊前臂向外生长的运动学作用解释的，与从罗得斯岛和东部阿那克西门德山脉的观测结果相当。如先前针对克里特岛和罗德岛所推论的那样，从扩张的前肢剪断的前肢条的向东北传播的横流运动很可能产生了沿时间方向增加的左旋剪切分量。后一个过程与克里特岛南部非洲海角的初期大陆碰撞有关。这意味着土耳其西南部和希腊东部弧线的研究领域之间存在运动学联系。

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