The late Paleozoic to Cainozoic intraplate deformation in North Arabia: a responce to plate boundary-forces
The late Paleozoic to Cainozoic intraplate deformation in North Arabia: a responce to plate boundary-forces
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北阿拉伯晚古生代至新生代板内变形：对板块边界力的响应
DOI：
10.5194/smsps-2-123-2002
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
V. Kazmin
中科院分区：
文献类型：
--
作者：
V. Kazmin
从晚古生代到新生代，北阿拉伯地区板内变形可分为几个阶段。主要裂谷期发生在晚石炭世-二叠世、中晚三叠世和早白垩世末期。它们都没有显示出与羽流活动的明确联系。第一个事件与冈瓦纳大陆被动边缘的几个微大陆的裂谷和新特提斯扩张中心的起源有关。据推测，这发生在古特提斯洋脊俯冲时，板片拉力直接从活动边缘传递到冈瓦纳古陆。北阿拉伯的三叠纪裂谷（可能是两阶段）与中谷地区的裂谷和扩张过渡有关。当新特提斯和中生代分别在二叠纪和晚三叠世（？）形成新的扩张轴时，冈瓦纳大陆边缘的扩张停止了。早白垩世裂谷与朝南的近阿拉伯海沟系统的形成同时发生。板坯拉力再次成为延伸的可能来源。阿拉伯被动边缘与海沟系统和未成熟岛弧的碰撞在坎帕阶-马斯特里赫特早期导致蛇绿岩仰冲达到顶峰。这一事件与北阿拉伯裂谷盆地和北西奈半岛的第一阶段反转（叙利亚弧的形成）相关。反转的后期阶段与非洲-欧亚大陆和阿拉伯-欧亚大陆碰撞有关。为了解释渐新世至上新世碰撞带的同时缩短、北阿拉伯裂谷盆地的压缩以及红海和亚丁湾的裂谷，使用了 L. Lobkovsky (1988) 的数值模型。据此，地幔岩石圈与地壳分离，并在碰撞过程中继续俯冲。板片拉力在岩石圈地幔中产生延伸，并沿着预先存在的“薄弱区域”（红海）产生裂谷，而压缩则在地壳层面传递，导致板内盆地反转。板片拉力似乎是北阿拉伯所有板内变形背后的主要力量。
Several stages of intraplate deformation are dis- tinguished in North Arabia from the Late Paleozoic to Cain- ozoic. The major rifting episodes occured in the Late Carboniferous-Permian, Middle-Late Triassic and at the end of the Early Cretaceous. None of them shows clear connec- tion with plume activity. The first event correlates with the rifting of several microcontinents from the Gondwana pas- sive margin and the origin of the Neotethyan spreading cen- ter. It is speculated that it happend when the Paleotethyan ridge was subducted and the slab-pull was directly transmit- ted from the active margin to Gondwana. Triassic rifting in North Arabia (probably 2-stage) is related to rifting and transition to spreading in Mesogea. Extension ceased on the Gondwana margin when new spreading axes were formed in Neotethys and Mesogea in the Permian and Late Triassic (?) respectively. Early Cretaceous rifting coincided with forma- tion of the south-facing Peri-Arabian trench system. Again the slab pull was a possible source of extension. Collision of the Arabian passive margin with the trench system and im- mature island arcs culminated in ophiolite obduction in the Campanian-Early Maastrichtian. This event correlates with the 1st phase of inversion in the North Arabian rift basins and in North Sinai (formation of the Syrian arc). Later stages of inversion correlate with Africa-Eurasia and Arabia-Eurasia collision. To explain simultaneous shortening in the colli- sion zone, compression in the North Arabian rift basins and rifting in the Red Sea and Gulf of Aden in the Oligocene to Pliocene, a numeric model by L. Lobkovsky (1988) is used. According to it, the mantle lithosphere is detached from the crust and continues to subduct through the time of collision. The slab pull creates extension in the lithospheric mantle and rifting along pre-existing "weak zones" (Red Sea), while compression is transmitted at the crustal level to cause in- version of the intraplate basins. It appears that the slab pull is a major force behind all intraplate deformation in North Arabia.