The role of flat slab subduction, ridge subduction, and tectonic inheritance in Andean deformation
The role of flat slab subduction, ridge subduction, and tectonic inheritance in Andean deformation
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平板俯冲、山脊俯冲和构造继承在安第斯变形中的作用
DOI：
10.1130/g50094.1
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发表时间：
2022
期刊：
影响因子：
5.8
通讯作者：
Perez, Nicholas D.
中科院分区：
文献类型：
--
作者：
Horton, Brian K.;Capaldi, Tomas N.;Perez, Nicholas D.
收敛的板块边界在造山带宽度和板内变形程度上表现出明显的变化。分析了晚新生代沿安第斯山麓和邻近前陆的收缩变形，突出了向板块内部推进的变形程度的对比。安第斯地形锋（以锋面冲断带构造为标志）和前陆变形锋（以孤立的基底块隆起为标志）的弧后位置在海沟轴线内侧300 ~ 900 km。在安第斯山脉（10°N ~ 55°S）约8000 km的弧形长度上，四个离散的向内变形推进最大值在空间上与秘鲁（5°S ~ 14°S）和潘潘（27°S ~ 33°S）的平板俯冲带、俯冲的智利脊（45°S ~ 48°S）和玻利维亚（17°S ~ 23°S）异常厚的古生代地层楔（17°S ~ 23°S）重合。弧后缩短与特定地球动力学配置的空间对应关系表明，平板俯冲、板块窗发育以及构造和地层几何组合在塑造科迪勒拉边缘造山构造中的力学作用，主要是通过岩石圈的增强、减弱和/或构造继承。
Convergent plate boundaries show sharp variations in orogenic width and extent of intraplate deformation. Analysis of late Cenozoic contractile deformation along the Andean mountain front and adjacent foreland highlights the contrasting degrees of deformation advance toward the plate interior. The retroarc positions of the Andean topographic front (marked by frontal thrust-belt structures) and foreland deformation front (defined by isolated basement block uplifts) range from 300 to 900 km inboard of the trench axis. Over the ~8000 km arcuate length of the Andes (10°N to 55°S), four discrete maxima of inboard deformation advance are spatially co-located with the Peruvian (5°S–14°S) and Pampean (27°S–33°S) zones of flat slab subduction, the subducted Chile Ridge (45°S–48°S), and the anomalously thick Paleozoic stratigraphic wedge of Bolivia (17°S –23°S). The spatial correspondence of retroarc shortening with specific geodynamic configurations demonstrates the mechanical role of flat slab subduction, slab window development, and combined structural and stratigraphic geometries in shaping the orogenic architecture of Cordilleran margins, largely through lithospheric strengthening, weakening, and/or tectonic inheritance.