Mesozoic plate-motion history below the northeast Pacific Ocean from seismic images of the subducted Farallon slab
Mesozoic plate-motion history below the northeast Pacific Ocean from seismic images of the subducted Farallon slab
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DOI：
10.1038/35012586
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发表时间：
2000-05-18
期刊：
影响因子：
64.8
通讯作者：
Grand, SP
中科院分区：
文献类型：
--
作者：
Bunge, HP;Grand, SP
俯冲洋板的高分辨率地震成像（1，2）已成为重建古地理的有力工具（3）。现在可以通过与地球地幔环流模型的比较来定量解释这些图像（4）。在这里，我们使用三维球形地幔对流计算机模型（5，6），以显示俯冲的Far-Allon板块的地震图像提供了强有力的证据，中生代时期的低角度俯冲在北美。这样一个低角度俯冲的时期已经被独立地用来解释在Laramide造山运动期间远离板块边界的落基山隆起（7）。计算机模拟还使我们能够定位在很大程度上未知的库拉-法拉隆扩张板块边界，其位置对于推断太平洋盆地“可疑”地形的轨迹非常重要（8）。
The high-resolution seismic imaging of subducted oceanic slabs(1,2) has become a powerful tool for reconstructing palaeogeography(3). The images can now be interpreted quantitatively by comparison with models of the general circulation of the Earth's mantle(4). Here we use a three-dimensional spherical computer model of mantle convection(5,6) to show that seismic images of the subducted Far-allon plate provide strong evidence for a Mesozoic period of low-angle subduction under North America. Such a period of low-angle subduction has been invoked independently to explain Rocky Mountain uplift far inland from the plate boundary during the Laramide orogeny(7). The computer simulations also allow us to locate the largely unknown Kula-Farallon spreading plate boundary, the location of which is important for inferring the trajectories of 'suspect' terrain across the Pacific basin(8).