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首页> 外文期刊>Journal of geodynamics >Palaeomagnetic evidence for the neotectonic evolution of the Erzincan Basin, North Anatolian Fault Zone, Turkey
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Palaeomagnetic evidence for the neotectonic evolution of the Erzincan Basin, North Anatolian Fault Zone, Turkey

机译：土耳其北安那托利亚断裂带埃尔津坎盆地新构造演化的古地磁证据

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摘要

Ongoing motion of Anatolia towards the west is caused by convergence of the Arabian and Eurasian plates coupled with suction towards the retreating Hellenic Arc. This regime is controlling the development of neotectonic structures in Turkey with the resulting distributed deformation accommodated primarily between the East and North Anatolian Intracontinental Transform Faults. The Erzincan Basin is developed along the eastern part of the latter fault and although it incorporates one of the largest Quaternary basins in Turkey, the duration and tectonic evolution are disputed. Tectonic models proposed to explain the basin range from simple rhomboidal pull-apart to a complex multi-phase evolution. To help constrain the age and tectonic regime(s) forming the basin we have conducted a palaeomagnetic and geochronologic study of volcanic domes which occur mainly in proximity to strike-slip faulting along the northern margin of the basin. The investigated sample comprises 27 lava sites located within 14 cones, 13 to the north and one in the south. Although difficult propositions for palaeomagnetic investigation because the young predominantly-pyroclastic constructive topography is susceptible to collapse, all sites show positive inclinations and mainly northerly declinations showing that they are the consequence of a tectonic regime confined to the Brunhes Chron. Whilst the limitation of directional data from these young constructive features is stressed, ten cones are found to show clockwise rotations ranging from 12° to 195° with three cones showing no significant rotation. Geochronological studies from 13 samples yield a range of ages with 6 providing meaningful results <0.3 Myr in age and consistent with young ages evident from morphology and paleomagnetism. AMS (Anisotropy of Magnetic Susceptibility) studies identify a fabric related to downslope flow at most sites with the majority moving away from conduits controlled by fractures paralleling the dominant NW-SE trend of the master fault. The palaeomagnetic and geochronologic results show that the history of the Erzincan Basin has involved at least two phases with the later phase incoporating an extensional component permitting access to mantle melts and confined to the last ～300,000 years. The earlier phase commenced in Late Miocene or Early Pliocene times and initiated the rift infill which currently attains a maximum thickness in excess of 2.7 km. We propose that the Erzincan Basin is now segmented as a mature basin by strike-slip cross faults although these cannot explain the consistent clockwise rotations observed within the small blocks incorporating the volcanic cones because these are confined to a narrow zone between two master faults and appear to be subject to ball-bearing style rotation.
机译：安纳托利亚向西的持续运动是由阿拉伯和欧亚板块的汇合以及向后撤的希腊弧带的吸力造成的。该政权控制着土耳其新构造结构的发展，由此产生的分布形变主要容纳在安纳托利亚东部和北部安纳托利亚大陆内部断层之间。 Erzincan盆地沿后者断层的东部发展，尽管它包含了土耳其最大的第四纪盆地之一，但其持续时间和构造演化仍存在争议。提出了构造模型来解释盆地的范围，从简单的菱形拉脱到复杂的多相演化。为了限制形成盆地的年龄和构造条件，我们对火山穹顶进行了古地磁和年代学研究，该火山穹顶主要发生在盆地北缘的走滑断层附近。所调查的样本包括位于14个圆锥体中的27个熔岩位点，其中北部13个，南部1个。尽管由于年轻的主要为碎屑岩的构造地形容易坍塌，所以古磁学研究存在困难，但所有遗址均显示出正倾角，主要呈北偏角，表明它们是局限在布鲁日纪年的构造政体的结果。虽然强调了来自这些年轻的构造特征的方向数据的局限性，但发现十个圆锥体显示了从12°到195°的顺时针旋转，其中三个圆锥体没有显示出明显的旋转。从13个样本进行的年代学研究得出一个年龄范围，其中6个年龄范围小于0.3 Myr，并且与从形态学和古磁性学上证明的年轻年龄相符，可得出有意义的结果。 AMS（磁化率各向异性）研究发现，在大多数位置，与下坡流动有关的织物，大部分远离由裂缝控制的导管，而这些裂缝与主断层的主要NW-SE趋势平行。古地磁和年代学结果表明，埃尔津坎盆地的历史至少涉及两个阶段，而后一个阶段则包含一个延伸成分，允许进入地幔熔体，并局限于近30万年。较早阶段始于中新世晚期或上新世早期，并开始了裂谷充填，目前裂谷充填的最大厚度已超过2.7 km。我们认为，厄尔金坎盆地现在被走滑交叉断层划分为一个成熟的盆地，尽管这些不能解释在合并火山锥的小块中观察到的一致的顺时针旋转，因为它们被限制在两个主断层之间的一个狭窄区域中并且出现了。受到滚珠轴承风格的旋转。

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