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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >The East Siberian basin in the Silurian: evidence for no large-scale sea-level changes
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The East Siberian basin in the Silurian: evidence for no large-scale sea-level changes

机译：志留纪的西伯利亚东部盆地：没有大规模海平面变化的证据

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According to conventional ideas, numerous eustatic sea-level changes occurred during the Phanerozoic with amplitudes 20-100 m and periods T = 1-3 Myr (third-order cycles). At the same time, it is widely recognized that tectonic factors have an important role in such water-depth changes. Rapid, large-scale sea-level changes have been suggested for the Silurian, for which detailed and continuous stratigraphic successions are available in the East Siberian sedimentary basin, ～2 * 10~6 km~2 in size. These show slow deposition at depths ≤5-10 m proceeded for 10-20 Myr in many regions and enable the mathematical analysis of maximum eustatic sea-level changes, with periods of T = 1-3 Myr (third-order), that could have occurred during the Silurian. The amplitudes of such events could not exceed ～20-30 m, and, for some epochs, could not be larger than 8-10 m. At the same time, rapid water-depth changes of up to ～100 m occurred in some other cratonic areas. As the Silurian has a relatively stable sea level, these must be attributed to rapid crustal uplift and subsidence. The absence of third-order eustatic fluctuations with amplitudes ≥ 10-20 m has also been demonstrated for the Cambrian and earliest Ordovician. It is probable that no significant sea-level changes also occurred at many other epochs, while rapid changes in water depth resulted from large-scale, vertical crustal movements.
机译：根据传统思想，在变生代期间发生了许多欢乐的海平面变化，振幅为20-100 m，周期T = 1-3 Myr（三次循环）。同时，人们广泛认识到构造因素在这种水深变化中具有重要作用。建议对志留纪海平面进行快速，大规模的海平面变化，在西伯利亚东部沉积盆地中，可以找到详细且连续的地层演替，其大小约为〜2 * 10〜6 km〜2。这表明在许多地区，在10-20 Myr处，≤5-10m深度的缓慢沉积进行了，并且能够对最大的海平面变化进行数学分析，周期为T = 1-3 Myr（三阶），这可能在志留纪期间发生过。此类事件的幅度不能超过〜20-30 m，并且在某些时期，不能大于8-10 m。同时，在其他一些克拉通地区，水深迅速变化，最高可达〜100 m。由于志留纪的海平面相对稳定，因此必须将其归因于地壳快速上升和下沉。寒武纪和最早的奥陶纪也没有振幅大于或等于10-20 m的三次欧拉波动。很可能在许多其他时期也没有发生明显的海平面变化，而大规模的垂直地壳运动导致了水深的快速变化。

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