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首页> 外文期刊>Journal of geodynamics >Structural analysis and tectonic evolution of the eastern Binalud Mountains, NE Iran
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Structural analysis and tectonic evolution of the eastern Binalud Mountains, NE Iran

机译：伊朗东北部比纳洛德山脉的结构分析和构造演化

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摘要

The Binalud Mountains are situated in the south of the Kopeh Dagh as a transitional zone between the Alborz and Central Iran zones. The Palaeotethys suture of the north Iran is located in this area. The Binalud Mountains consists of relatively thick successions of sedimentary, metamorphic and igneous rocks. The earliest deformation, a polyphase synmetamorphic deformation which occurred entirely in ductile conditions, is distinguished in the metamorphic rocks of the eastern part. D1, D2 and D3 deformation phases are related to this deformation. The D4 deformation affected the area after a period of sedimentation and erosion. The thrust faults of the central and southern part of the eastern Binalud were classified as structures related to the D5 tectonic event. From the geodynamic point of view, in Late Palaeozoic times the studied area formed an oceanic trench generated by the subduction of the Palaeotethys oceanic litho-sphere beneath the Turan Plate. In the Late Triassic, the Early Cimmerian Event resulted in a collisional type orogeny generating a transpression polyphase deformation and the metamorphism of Permian and older sediments. Following this collision, granite intrusions were emplaced in the area and caused contact metamorphism. The exhumation and erosion of the rocks deformed and metamorphosed during Early Cimmerian Event caused the formation of molassic type sediments in a Rhaetian-Lias back arc basin. The continuation of convergence between the Turan and Iran Plates caused the metamorphism of these sediments and their transformation to phyllite and meta-sandstone. During Late Mesozoic and Early Cenozoic times, the convergence between Central Iran and Turan Plates continued and a NE compression caused folding of the Cretaceous and older rocks in the Kopeh Dagh area. In the Binalud area this deformation caused the generation of several thrust fault systems with S to SW vergence, resulting in a thrusting of Palaeozoic and Mesozoic successions on each other and on the Neogene sediments at the southern border of the Binalud Mountains.
机译：Binalud山脉位于Kopeh Dagh的南部，是Alborz和伊朗中部地区之间的过渡区。伊朗北部的Palaeotethys缝合线位于该区域。 Binalud山脉由相对较厚的沉积，变质和火成岩组成。最早的变形是多相共形变形，它完全在延性条件下发生，在东部的变质岩中具有明显的特征。 D1，D2和D3变形阶段与此变形有关。经过一段时间的沉积和侵蚀后，D4变形影响了该区域。东比纳洛德中南部的逆冲断层被归类为与D5构造事件有关的构造。从地球动力学的角度来看，在古生代末期，研究区形成了由图兰板块下方的古海洋的岩石圈俯冲而产生的海沟。在三叠纪晚期，早西美利亚事件导致了碰撞型造山作用，产生了压变多相变形和二叠纪和较早沉积物的变质作用。这次碰撞之后，该区域就发生了花岗岩侵入，并引起了接触变质作用。西里米亚早期事件中变形和变质的岩石的发掘和侵蚀导致在Rhaetian-Lias背弧盆地中形成了糖蜜型沉积物。图兰板块和伊朗板块之间继续收敛，导致这些沉积物变质，并转变为千枚岩和变质砂岩。在中生代晚期和新生代早期，伊朗中部和图兰板块之间的辐合持续，NE压缩使科佩达格地区的白垩纪和老岩石折叠。在比纳洛德地区，这种变形导致形成了若干由南至南向S展布的逆冲断层系统，从而使古生代和中生代相继地相互推挤，并推翻了比纳鲁德山脉南部边界的新近纪沉积物。

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