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首页> 外文期刊>Petroleum Geoscience >Crustal architecture of the Laptev Rift System in the East Siberian Arctic based on 2D long-offset seismic profiles and gravity modelling
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Crustal architecture of the Laptev Rift System in the East Siberian Arctic based on 2D long-offset seismic profiles and gravity modelling

机译：基于2D长偏移地震剖面和重力建模的基于2D的East西伯利亚北极地壳建筑

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摘要

The Laptev Shelf in the East Siberian Arctic represents a rare tectonic setting where an active oceanic spreading centre, the Gakkel Ridge, intersects a continental margin. The North America-Eurasia plate boundary follows the Gakkel Ridge and passes into a continental shelf; this has resulted in the development of a wide rift system that has been active since the Late Cretaceous. The new long-offset seismic profiles provide a reliable basis for deciphering the structural characteristics of this rift system. We use two new seismic profiles, along with one acquired in the 1990s, to examine the crustal architecture of the rift system. Our approach combines seismic interpretation, time to depth conversion of seismic profiles and 2D gravity forward modelling. The obtained results indicate the presence of hyperextended continental crust beneath the Ust' Lena Rift Basin and exhumed continental mantle at the base of the syn-rift succession along the rift axis. The upper crust was removed by brittle stretching, while the lower crust experienced extreme ductile thinning Our results show that continental crust can be eliminated in the course of rifting without a considerable heat input from asthenospheric mantle.
机译：East西伯利亚北极的Laptev货架代表了一个罕见的构造环境，其中一个活跃的海洋传播中心，Gakkel Ridge，与大陆边缘相交。北美洲 - 欧亚平板界面沿着Gakkel山脊沿着陆地架子进行;这导致了发展自白垩纪晚期以来一直活跃的宽裂缝系统。新的长偏移地震型材为解密该裂缝系统的结构特征提供了可靠的基础。我们使用两个新的地震曲线，以及在20世纪90年代收购的新地震型材，以检查裂缝系统的地壳架构。我们的方法结合了地震解释，时间深度转换地震型材和2D重力前进建模。所获得的结果表明，在沿着裂缝轴的同步裂缝连续的Syn-Rift连续的基础下，在UST'Lena Rift盆地和挖掘大陆地幔下存在过伸展的大陆地壳。通过脆性拉伸除去上部地壳，而下地壳经历过极端性延展性，我们的结果表明，在脱离的过程中可以消除大陆地壳，而无需从哮喘的地幔的相当大输入。

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