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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 >Basin migration caused by slow lithospheric extension
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Basin migration caused by slow lithospheric extension

机译：岩石圈缓慢扩张引起的盆地迁移

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摘要

Sedimentary basin migration caused by low lithospheric extension rates is investigated using a two-dimensional dynamic numerical model of the lithosphere. We find that continental breakup will eventually occur when larger extension velocities are used. The duration of rifting prior to continental breakup is dependent on the extension velocity. Stretching the lithosphere with lower velocities does not lead to breakup. Instead, the locus of maximum extension migrates. Deformation localizes outside the first formed basin that is in turn uplifted. This basin then becomes a 'cold spot' in the area. In this case, syn-rift cooling predominates; the lithosphere regains its strength during stretching instead of becoming weaker, and the lithosphere necking zone becomes stronger than surrounding regions. The transition velocity is, for the cases studied, about 8 mm/yr, while the locus of maximum thinning migrates after about 50-60 Myr. A comparison with observations of the mid-Norwegian, Galicia and ancient South Alpine margins shows a close resemblance of important features.
机译：利用岩石圈二维动态数值模型研究了岩石圈扩展速率低引起的沉积盆地迁移。我们发现，使用更大的延伸速度时，大陆将最终发生分裂。大陆分裂之前的裂谷持续时间取决于伸展速度。以较低的速度伸展岩石圈不会导致破裂。而是，最大扩展位置迁移。变形局限在第一个已形成的盆地外，而后者又被抬升。然后，该盆地成为该地区的“冷点”。在这种情况下，同速分离冷却占主导。岩石圈在拉伸过程中恢复了强度，而不是变弱，并且岩石圈颈缩区变得比周围区域强。对于所研究的情况，过渡速度约为8毫米/年，而最大变薄的轨迹在约50-60 Myr之后迁移。将其与挪威中部，加利西亚和古代南高山边缘的观测结果进行比较，发现其重要特征极为相似。

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