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首页> 外文期刊>Journal of Asian earth sciences >Thin-skinned tectonics in the Central Basin of the Iranian Plateau in the Semnan area, Central Iran
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Thin-skinned tectonics in the Central Basin of the Iranian Plateau in the Semnan area, Central Iran

机译：伊朗中部塞南地区伊朗高原中部盆地的薄皮构造

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摘要

During continent-continent convergence of the Arabian and Eurasian plates, and after the late Eocene inversion of a back-arc rift, the Iranian Plateau underwent broad subsidence resulting in the formation of the Central Basin (Morley et al., 2009). New 2D seismic data acquired by National Iranian Oil Company (NIOC) in the NW-SW-trending arm of the Central Basin suggest that during the main stage of shortening (middle-late? Miocene to Pliocene), strain concentrations resulted in the development of the thin-skinned Kuh-e-Gachab, Kuh-e-Gugerd, Garmsar and Sorkh-e-Kuh structures. These structures are built of Oligocene-Miocene/Pliocene(?) rocks belonging to the Lower Red, Qpm and Upper Red formations. Seismic data suggest that one of these structures comprises the south-verging Kuh-e-Gachab anticline, which is bounded by the N-dipping Kuh-e-Gachab thrust and cored by a complex array of thrust sheets forming a triangle zone. During the deformation process, two salt evaporate levels played a significant role as detachment horizons. The main detachment horizon was rooted within the Lower Red Formation, whereas the second detachment horizon was located along evaporites belonging to the Upper Red Formation. Variations in the thin-skinned style of deformation between the larger triangle zone in the western part of the Kuh-e-Gachab structure contrasts with less shortening in the smaller triangle zone to the east. This suggests that the change resulted from the increase of thickness of the mobile detachment horizon to the east. Contraction deformations are still active south of the Alborz Mountains, which is confirmed by GPS data and present-day seismicity.
机译：在阿拉伯和欧亚大陆大陆-大陆交汇期间，以及晚始新世反弧裂谷反转之后，伊朗高原经历了广泛的沉陷，形成了中部盆地（Morley等，2009）。由伊朗国家石油公司（NIOC）在中部盆地西北-西南走向臂获得的新的2D地震数据表明，在缩短的主要阶段（中晚—中新世至上新世），应变集中导致了中新世的发展。薄皮的Kuh-e-Gachab，Kuh-e-Gugerd，Garmsar和Sorkh-e-Kuh结构。这些结构是由属于下红，Qpm和上红地层的渐新世-中新世/上新世（？）岩石建造的。地震数据表明，这些结构之一包括南端的Kuh-e-Gachab背斜，该背斜以N倾角的Kuh-e-Gachab逆冲作用为边界，并由形成三角形区域的复杂的逆冲板片为中心。在变形过程中，两个盐的蒸发水平起着分离层的作用。主要脱离层位根系在下部红组内，而第二脱离层位则沿属于上部红层的蒸发岩分布。 Kuh-e-Gachab结构西部较大三角形区域之间的薄皮形变形式的变化与东部较小三角形区域的缩短变短形成对比。这表明这种变化是由于东部移动活动层的厚度增加所致。收缩变形仍在Alborz山区以南发生，这已被GPS数据和当今的地震活动所证实。

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  • 来源
    《Journal of Asian earth sciences》 |2013年第30期|269-281|共13页
  • 作者

    Soheila Bouzari; Andrzej Konon; Marek Koprianiuk; Ali A. Julapour;

  • 作者单位

    Islamic Azad University, North Tehran Branch, Geology Department, Tehran, Iran,University of Warsaw, Faculty of Geology, Zwirki i Wigury 93, 02-089 Warsaw, Poland;

    University of Warsaw, Faculty of Geology, Poland,University of Warsaw, Faculty of Geology, Zwirki i Wigury 93, 02-089 Warsaw, Poland;

    Polish Oil and Gas Company (PGNiG SA), 25 Kasprzaka St. 01-224 Warsaw, Poland,University of Warsaw, Faculty of Geology, Zwirki i Wigury 93, 02-089 Warsaw, Poland;

    National Iranian Oil Company (NIOC), Iran Exploration Directorate, 1st Dead-end, Seoul St., NE Sheikh Bahaei sq., P.O. Box 19395-6669, Tehran, Iran,University of Warsaw, Faculty of Geology, Zwirki i Wigury 93, 02-089 Warsaw, Poland;

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  • 正文语种 eng
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  • 关键词

    central basin; iranian plateau; thin-skinned tectonics; triangle zone; salt tectonics; cenozoic;

    机译：中央盆地伊朗高原薄皮构造三角带盐构造新生代;

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