Extension of the North Anatolian Fault into the North Aegean Trough: Evidence for transtension, strain partitioning, and analogues for Sea of Marmara basin models
Extension of the North Anatolian Fault into the North Aegean Trough: Evidence for transtension, strain partitioning, and analogues for Sea of Marmara basin models
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北安纳托利亚断层延伸至北爱琴海槽：变形、应变划分和马尔马拉海盆地模型类似物的证据
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
Michael Ivanov
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作者：
Lisa C. McNeill;A. Mille;T. Minshull;Jonathan M. Bull;N. H. Kenyon;Michael Ivanov
北爱琴海槽在构造上受北安纳托利亚断层从土耳其西部和马尔马拉海投射到爱琴海的控制，其变形分布与土耳其中东部的简单走滑断层模型相反。该区域可容纳伸展和右旋位移。新的侧扫声纳数据与新的海底剖面仪和已发布的地震数据相结合，揭示了东部海槽和沙罗湾内以倾斜梯形和里德尔（R、R'和P）裂缝和移位地貌特征形式存在的右旋位移的证据。在地震震源机制的支持下，浅地壳中的应变划分允许以下两种类型的断层共存：（1）控制盆地重要垂直地形的拉张盆地边界断层；（2）中央盆地内的右旋断层。这些类型的断层在更深处融合成单一断层。一条可能的左西北走向断层将两个次盆地分开，可能表明地壳块体旋转，变形集中在块体角部。来自爱琴海北部的此类证据和模型类似于马尔马拉海内的张拉和拉裂盆地模型。
The North Aegean Trough is tectonically controlled by the projection of the North Anatolian Fault from western Turkey and the Sea of Marmara into the Aegean, where deformation is distributed in contrast to the simple strike‐slip fault model for central eastern Turkey. This region accommodates extensional and dextral displacement. New side‐scan sonar data coupled with new subbottom profiler and published seismic data reveal evidence for dextral displacement within the eastern trough and Gulf of Saros in the form of oblique en echelon and Riedel (R, R′, and P) fractures and displaced geomorphic features. Strain partitioning in the shallow crust allows the following two styles of faulting to coexist, supported by earthquake focal mechanisms: (1) transtensional basin‐bounding faults controlling the significant vertical topography of the basin and (2) dextral faulting within the central basin. These styles of faulting merge at greater depths into a single fault. A possible sinistral NW striking fault separates two subbasins and may indicate crustal block rotation with deformation focused in block corners. Such evidence and models from the north Aegean are similar to models of transtension and pull‐apart basins within the Sea of Marmara.