Flat slab deformation caused by interplate suction force
Flat slab deformation caused by interplate suction force
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板间吸力引起的平板变形
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
R. Clayton
中科院分区：
文献类型：
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作者：
Yiran Ma;R. Clayton
我们的图像结构在南端的秘鲁平坦俯冲带，使用接收函数和表面波方法。纳斯卡板块俯冲至约100 km深度，然后在恢复倾斜俯冲之前保持平坦约300 km。该平板与上方大陆莫霍面的地形密切相关，表明该平板与上覆板块之间存在强烈的吸力。高速地幔楔存在于平板的初始一半上方，在平板再次变陡之前，速度恢复到正常值，表明脱水和生态化的恢复。在中安第斯山脉下70公里厚的地壳中发现了两个突出的中地壳结构：西科迪勒拉山脉下的熔岩和东科迪勒拉山脉下的巴西地盾。
We image the structure at the southern end of the Peruvian flat subduction zone, using receiver function and surface wave methods. The Nazca slab subducts to ~100 km depth and then remains flat for ~300 km distance before it resumes the dipping subduction. The flat slab closely follows the topography of the continental Moho above, indicating a strong suction force between the slab and the overriding plate. A high‐velocity mantle wedge exists above the initial half of the flat slab, and the velocity resumes to normal values before the slab steepens again, indicating the resumption of dehydration and ecologitization. Two prominent midcrust structures are revealed in the 70 km thick crust under the Central Andes: molten rocks beneath the Western Cordillera and the underthrusting Brazilian Shield beneath the Eastern Cordillera.