收敛板块内大陆块体的内部变形:来自Ovacık断层(安纳托利亚,土耳其)的启示

IF 1.3 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Turkish Journal of Earth Sciences Pub Date : 2023-01-01 DOI:10.55730/1300-0985.1849
Cengiz Zabcı, T. Sançar, D. Tikhomirov, S. Ivy‐Ochs, C. Vockenhuber, A. Friedrich, Müge Yazıcı, N. Akçar
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引用次数: 0

摘要

安纳托利亚活动构造的主要特征是相对于欧亚大陆向西运动,在西部的希腊俯冲和东部的阿拉伯-欧亚大陆碰撞之间。虽然大部分变形被认为局限于安纳托利亚的边界元素,即北安纳托利亚剪切带和东安纳托利亚剪切带,但最近的研究表明,内部应变积累的程度更高,特别是沿其中部省份的平行/次平行走滑断层。我们提出了第一个基于形态年代学的滑移率估计,其中一个走滑构造,Ovacık断层,利用宇宙成因36 Cl定年的冲积河流矿床。在Köseler站点(39.3643°N, 39.1688°E),两条断裂的立沟将冲积扇及其亚平面(NF1/NF1′)与插入的阶地踏面(NF1/T2)相结合,分别偏移19 ~ 24 m和15 ~ 22 m。36 Cl浓度在深度剖面上的分散地表年龄和变异性为冲积扇和阶地沉积的遗传提供了强有力的证据;因此,我们对两个表面都使用了模拟深度剖面年龄。在NF1/NF1的上踏面重建和NF1/T2的下踏面重建中,NF1/NF1和T2的屈服滑移率分别为2.4 +0.5/ -0.4 mm/a和2.8 +0.7/ -0.7 mm/a,模型年龄分别为8-10 ka和6-8 ka。我们的结果与先前对其他构造的滑动率估计一起显示了安纳托利亚的显著内部变形,特别是沿着其次平行走滑断层。这些次级断层将安纳托利亚切割成几块,形成了马拉提亚-埃尔津坎、卡帕多西亚和安纳托利亚中部的断层,这些断层的几何形状受到特提斯增生复合体分布的强烈控制。
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Internal deformation of continental blocks within converging plates: insights from the Ovacık Fault (Anatolia, Türkiye)
: The active tectonics of Anatolia is mostly characterized by its westward motion with respect to Eurasia between the Hellenic subduction in the west and Arabia-Eurasia continental collision in the east. Although most of the deformation is suggested to be confined along Anatolia’s boundary elements, viz. the North and East Anatolian shear zones, recent studies indicate a higher magnitude of internal strain accumulation, especially along the parallel/subparallel strike-slip faults of its central province. We present the first morphochronology-based slip rate estimate for one of these strike-slip structures, the Ovacık Fault, by using cosmogenic 36 Cl dating of offset fluvial deposits. At the Köseler Site (39.3643°N, 39.1688°E), two faulted risers, bounding the alluvial fan with its subplanar surface (NF1/NF1’) and the inset terrace tread (NF1/T2), are offset 19–24 and 15–22 m, respectively. The scattered surface ages and variability of 36 Cl concentrations in depth profiles suggest strong evidence for inheritance in alluvial fan and terrace deposits; thus, we used modelled depth-profile ages for both surfaces. The modelled ages 8–10 ka for NF1 and 6–8 ka for T2 yield slip-rate estimates 2.4 +0.5/–0.4 mm/a and 2.8 +0.7/–0.7 mm/a, respectively, for the upper-tread reconstruction of the NF1/NF1’and the lower-tread reconstruction of the NF1/T2. Our results together with previous slip-rate estimates for other structures show a significant internal deformation for Anatolia, especially along its subparallel strike-slip faults. These secondary faults slice Anatolia into several pieces giving rise to the formation of the Malatya-Erzincan, Cappadocian, and Central Anatolian slices, where the geometry is strongly controlled by the distribution of the Tethyan accretionary complexes.
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来源期刊
Turkish Journal of Earth Sciences
Turkish Journal of Earth Sciences 地学-地球科学综合
CiteScore
2.40
自引率
10.00%
发文量
6
审稿时长
6 months
期刊介绍: The Turkish Journal of Earth Sciences is published electronically 6 times a year by the Scientific and Technological Research Council of Turkey (TÜBİTAK). It is an international English-language journal for the publication of significant original recent research in a wide spectrum of topics in the earth sciences, such as geology, structural geology, tectonics, sedimentology, geochemistry, geochronology, paleontology, igneous and metamorphic petrology, mineralogy, biostratigraphy, geophysics, geomorphology, paleoecology and oceanography, and mineral deposits. Contribution is open to researchers of all nationalities.
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