Extensional-compressional tectonics associated with the Aegean Arc: comparison with the Andean Cordillera of south Peru - north Bolivia
Extensional-compressional tectonics associated with the Aegean Arc: comparison with the Andean Cordillera of south Peru - north Bolivia
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DOI：
10.1098/rsta.1981.0068
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发表时间：
1981-03
期刊：
影响因子：
--
通讯作者：
J. Mercier
中科院分区：
文献类型：
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作者：
J. Mercier
沿着爱琴海弧以及秘鲁南部和玻利维亚北部的安第斯山脉的交汇边界分析了拉张-压缩构造。本文仅讨论中新世、上新世和更新世时代的变形。爱琴海盆地的主导形态是伸展的。然而U.中新世—L.的两个挤压构造阶段上新世和更新世年龄已有记录。它们在地中海沿岸的许多地方也很出名。因此，在爱琴海引发挤压构造的力量似乎起源于该地区之外。它们似乎与阿拉伯-非洲板块和欧亚板块之间的收敛条件的变化（速率变化？）有关。在秘鲁南部和玻利维亚北部的安第斯山脉下方，俯冲带以 25-30° 的角度俯冲，就像在爱琴海弧下一样。与爱琴海一样，那里的构造主要是伸展运动，并且几个短暂的压缩阶段打破了这种伸展状态。后者也可能是由纳斯卡板块和南美板块之间的收敛条件的变化引起的。在秘鲁中部下方、纳斯卡海岭以北，俯冲带以约 10° 的小角度俯冲。在那里，新构造变形是不同的。在近代，它们本质上是挤压性的或表现为走滑断层。来自爱琴海和安第斯山脉的地质数据似乎表明，俯冲带上方地壳的压缩变形受到沿汇聚边界的应力条件的强烈控制。
Extensional-compressional tectonics are analysed along the convergent boundaries of the Aegean Arc and of the Andean Cordillera of south Peru and north Bolivia. This paper deals only with deformations of Miocene, Pliocene and Pleistocene ages. The prevailing regime in the Aegean basin is extensional. Yet two compressional tectonic phases of U. Miocene—L. Pliocene and of L. Pleistocene age have been recorded. They are also known in many places all around the Mediterranean. Thus forces that induce compressional tectonics in the Aegean seem to have their origin outside the region. They seem to be linked with changes in the conditions of convergence (change in rate?) between the Arabo-African and Eurasian plates. Beneath the Andean Cordillera of south Peru — north Bolivia, the subduction zone plunges at an angle of 25- 30° as it does under the Aegean Arc. There, as in the Aegean Sea, tectonics are predominantly extensional and several short-lived compressional phases break up this extensional regime. The latter may also be induced by changes of the conditions of convergence, here between the Nazca and South American plates. Beneath central Peru, north of the Nazca Ridge, the subduction zone plunges at a small angle, about 10°. There, neotectonic deformations are different. In the Recent they are essentially compressional or expressed by strike-slip faulting. Geological data from the Aegean and Andes seem to demonstrate that the compressional deformation in the crust above subduction zones is strongly controlled by the stress conditions along convergent boundaries.