Paleomagnetic Investigations in Central Chile: Tectonics ofthe Andean Orogen

安第斯山脉是大陆地壳下海洋岩石圈俯冲作用造山的典型例子。古地磁研究已经在智利和秘鲁的安第斯山脉和海岸山脉发现了一种系统的块体旋转模式，秘鲁的块体逆时针旋转，智利的块体顺时针旋转，这种模式影响着早在白垩纪晚期的岩石。这项研究将在智利中部收集新的古地磁数据，这将有助于确定地磁旋转的原因，并区分目前的几种假设。结果不仅对了解安第斯构造很重要，而且对了解其他地方的安第斯型构造响应也很有意义。

The Andean mountain chain is the classic example of orogenesis due to subduction of oceanic lithosphere beneath continental crust. Paleomagnetic studies have detected a systematic pattern of block rotations in the Andes and Coast Range of Chile and Peru, with counterclockwise rotations in Peru and clockwise ones in Chile, that affect rocks as young as latest cretaceous. This research will collect new paleomagnetic data in central Chile that will help determine the cause of the rotations and distinguish between several current hypotheses. Results will not only be important in understanding Andean tectonics, but will be of interest in understanding Andean-type tectonic responses elsewhere.