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Development of the Southern Coastal Area of the Caspian Sea during the Pliocene–Quaternary According to Biostratigraphic and Magnetostratigraphic Data
Stratigraphy and Geological Correlation ( IF 1 ) Pub Date : 2022-07-14 , DOI: 10.1134/s0869593822040074
V. G. Trifonov, K. Hessami, S. V. Popov, E. A. Zelenin, Ya. I. Trikhunkov, P. D. Frolov, L. A. Golovina, A. N. Simakova, A. Rashidi, A. V. Latyshev

Abstract

The paper considers geological structure of the coastal region of the South Caspian, including paleontological and magnetostratigraphic dating of the Neogene–Quaternary deposits. Western and eastern segments of the region between the South Caspian Basin and the Alborz Ridge developed differently in the Late Cenozoic. In the west, marine sediments did not penetrate beyond the coastal plain into the neighboring lowered part of the Alborz Ridge during the Pliocene–Quaternary. This indicates the stability of the marine basin boundary or its expansion due to the abrasion of the Alborz slopes. In the east, a piedmont step emerged, bounded by thrust faults. The marine deposition at the piedmont step occurred in the Miocene. At the end of the Miocene, the marine sediments were folded and eroded. The Akchagylian (Piacenzian–Gelasian) marine sediments accumulated at the northern edge of the piedmont step. The Khazar fault raised these sediments up to 120–150 m and isolated the piedmont step. Thus, the expansion of the Alborz mountain building and the reduction of the South Caspian Basin occurred in the eastern part of the coastal area from the Late Miocene. The differences between the western and eastern segments of the coastal area are related to the development of the South Caspian Basin. Until the Late Miocene, it remained a residual trough of the Paratethys. During the Pliocene–Quaternary, the eastern part was filled with sediments up to 6 km thick and retained the features of a thinned continental crust 30–37 km thick with sedimentary cover up to 16 km thick. The western part of the basin was filled with sediments about 10 km thick and acquired the features of suboceanic crust with the Mohorovichich surface at a depth of 28–30 km with a thickness of the sedimentary cover exceeding 20 km.



中文翻译:

根据生物地​​层和磁地层数据的上新世-第四纪里海南部沿海地区的发展

摘要

本文考虑了南里海沿海地区的地质结构,包括新近纪-第四纪矿床的古生物和磁地层测年。南里海盆地和厄尔布尔士海脊之间的西部和东部段在晚新生代发育不同。在西部,上新世-第四纪期间,海洋沉积物没有渗透到沿海平原以外的厄尔布尔士海岭附近的较低部分。这表明海盆边界的稳定性或由于厄尔布尔士斜坡的磨损而扩大。在东部,出现了一个山前台阶,以逆冲断层为界。山前台阶的海相沉积发生在中新世。中新世末期,海洋沉积物发生褶皱侵蚀。Akchagylian(Piacenzian-Gelasian)海相沉积物堆积在山前台阶的北部边缘。Khazar 断层将这些沉积物抬高到 120-150 m 并隔离了山前台阶。因此,厄尔布尔士山脉的扩张和南里海盆地的减少发生在晚中新世以来的沿海地区东部。海岸带东西段的差异与南里海盆地的发育有关。直到晚中新世,它仍然是Paratethys的残余槽。上新世—第四纪,东部充填厚达 6 km 的沉积物,保留了 30~37 km 厚的减薄大陆地壳特征,沉积覆盖层达 16 km 厚。

更新日期:2022-07-15
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