GEOMETRY OF PROPAGATING CONTINENTAL RIFTS
GEOMETRY OF PROPAGATING CONTINENTAL RIFTS
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DOI：
10.1038/316625a0
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发表时间：
1985-01-01
期刊：
影响因子：
64.8
通讯作者：
BOSWORTH, W
中科院分区：
文献类型：
--
作者：
BOSWORTH, W
通过大陆边缘的复古恢复来重建过去的板块构型1-4需要详细了解大陆水平伸展的几何形状。伸展通常限于称为裂谷5，6的离散的线性地带，而利用垂直岩脉和裂隙扩展的裂谷模型7-10对于评估裂谷盆地构造演化中隆起、下沉和伸展的相对重要性和时间是有用的。然而，许多模型不能充分解释所观察到的裂缝的不对称性。这里描述了年轻的和破裂的大陆裂谷的总体三维特征，可以用来推导大陆岩石圈裂谷扩展的结构模型。由于低角度正断层在整个裂谷几何结构中所起的作用，裂谷变得不对称。
Reconstruction of past plate configurations through palinspastic restoration of continental margins1–4requires a detailed knowledge of the geometries of horizontal continental extension. Extension is often restricted to discrete, linear zones termed rifts5,6, and rift models that invoke propagating vertical dykes and cracks7–10are useful for assessing the relative significance and timing of uplift, subsidence and extension in the tectonic evolution of rift basins. However, many models do not adequately account for the observed asymmetry of rifts. I describe here the general three-dimensional character of young and aborted continental rifts, which can be used to derive a structural model for the propagation of rifts in continental lithosphere. The rifts become asymmetric as a consequence of the role played by low-angle normal faults in the overall rift geometry.