The Pacific Margin of the Antarctic Pennisula: A Marine Geophysical Study of the Tectonic Evolution of Andean-Type Orogens

本研究侧重于几个全球重要的， 地壳形成的造山过程，一直活跃在 太平洋边缘复杂的构造历史 南极洲 该奖项支持全面的地球物理 调查（即，多道地震（MCS）、重力、磁力、 声纳浮标和多波束测深法）， 南极半岛。 它将阐明南方的作用 设得兰群岛-布兰斯菲尔德海槽地区作为一个现代模拟的 安第斯造山过程和作为一个具体的步骤， 侦察更少的访问，因此，更多 南极西部边缘鲜为人知的部分 别林斯高晋海和阿蒙森海 通过整合 海洋数据与陆上地质观测和运动学 板块运动的历史，这项调查应该能够 取得真实的进展， 安第斯型造山作用;大陆型造山作用; 会聚大陆边缘岩石圈伸展 脊顶俯冲;以及大- 具有会聚边缘的偏移断裂带，包括 俯冲复合体的隆升 这项研究将为美国南极提供动力 地球科学倡议通过进行最雄心勃勃的 迄今为止， 民族

This study focuses on several globally important, crust-forming orogenic processes that have been active during the complex tectonic history of the Pacific margin of Antarctica. This award supports a comprehensive geophysical survey (i.e., Multi-Channel Seismic (MCS), gravity, magnetics, sonobuoys and multi-beam bathymetry) of two parts of the Antarctic Peninsula. It will illuminate the role of the South Shetland Islands-Bransfield Trough region as a modern analog of Andean orogenic processes and as a specific step toward tectonic reconnaissance of the less accessible, and therefore, more poorly known parts of the West Antarctic margin bordering the Bellingshausen and Amundsen seas. By integrating the marine data with onshore geologic observations and kinematic plate motion histories, this investigation should be able to make real progress toward increased understanding of the following processes: Andean-type orogenesis; continental lithosphere extension in a convergent continental margin setting; ridge crest subduction; and interaction of large- offset fracture zones with convergent margins, including the uplift of subduction complexes. The study will provide impetus for the U.S. Antarctic Geoscience Initiative by undertaking the most ambitious Antarctic marine geophysical study carried out to date by any nation.