Inversion of a hyper-extended rifted margin in the Southern Central Range of Taiwan
Inversion of a hyper-extended rifted margin in the Southern Central Range of Taiwan
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DOI：
10.1130/g34402.1
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发表时间：
2013-08
期刊：
影响因子：
5.8
通讯作者：
K. Mcintosh;H. Avendonk;L. Lavier;W. R. Lester;D. Eakin;Francis T. Wu;Char‐Shine Liu;Chao‐Shing Lee
中科院分区：
文献类型：
--
作者：
K. Mcintosh;H. Avendonk;L. Lavier;W. R. Lester;D. Eakin;Francis T. Wu;Char‐Shine Liu;Chao‐Shing Lee
台湾南部和西部的地震反射和广角资料表明，中国大陆边缘伸展至超伸展的大陆地壳存在于陆架以南200多公里处，并在马尼拉海沟处俯冲。此外，地壳尺度层析速度模型显示，该地壳被逆冲至增生棱镜下方约15公里的深度，然后在结构上被置于棱镜的底部。我们记录了从南到北增加的地壳体积，在我们的北部样带中，增生棱镜的高速物质可以直接与中央山脉基底岩石的露头联系起来。从地图上看，台湾中部山脉明显与南部的恒春半岛和恒春海底脊相连。据此，我们提出了一种新的模式，即中央山脉直接形成于吸积棱镜，包括基底核，基底核由俯冲、吸积、伸展到超伸展的大陆地壳。
Seismic reflection and wide-angle data acquired across, south, and west of Taiwan show that extended to hyper-extended continental crust of the Chinese continental margin is present more than 200 km south of the shelf and is subducting at the Manila Trench. Furthermore, crustal-scale tomographic velocity models show that this crust is underthrusted to ∼15 km depth below the accretionary prism, where it then is structurally underplated to the base of the prism. We document an increasing volume of accreted crust from south to north, and in our northern transect high-velocity material of the accretionary prism can be directly linked to outcrops of Central Range basement rocks. In map view the Central Range of Taiwan is clearly contiguous with the Hengchun Peninsula and Hengchun submarine ridge to the south. Accordingly, we propose a new model in which the Central Range forms directly from the accretionary prism, including the basement core, which originates from subducted, and then accreted, extended to hyper-extended continental crust.