Regional Structure of the Antarctic Peninsula Derived from ERS-1 SAR Mosaic: A Study of Upper/Lower Plate Interactions During Subduction of the Antarctic/Aluk Ridge Crest

ERS-1 SAR 马赛克衍生的南极半岛区域结构：南极/阿鲁克海岭顶俯冲过程中上/下板块相互作用的研究

• 批准号: 9527550
• 负责人: Terry Wilson
• 金额: $ 2.5万
• 依托单位: Ohio State University Research Foundation -DO NOT USE
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-08-01 至 1997-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9527550&HistoricalAwards=false
• 关键词: Regional; Structure; Antarctic; Peninsula; Derived

Abstract This award supports a project to use synthetic aperture radar (SAR) data from the European ERS-1 satellite for a structural analysis of the Antarctic Peninsula. This project constitutes a demonstration of the use of SAR data for geological and geophysical investigations in largely ice covered regions. The Cenozoic tectonic evolution of the Antarctic Peninsula involves a history of geometrically simple orthogonal plate subduction, with successive collision of fracture zone-bounded segments of the Antarctic-Aluk ridge crest from south to north along the convergent margin. It has been proposed that the subducted fracture zones are reflected in geological and structural segmentation of the Antarctic Peninsula and, therefore, a direct mechanical interaction between the upper and lower plates along the subducting margin is suggested. Structural mapping from a synoptic ERS-1 SAR mosaic of the entire Antarctic Peninsula should document the regional continuity of any fracture zones into the continental crust and any systematic changes in structure within the peninsula that may be linked these fracture zones. The goal is to systematically evaluate the impact of subducting fracture zones on the upper plate along the convergent margin. The Antarctic Peninsula provides an unrivaled opportunity for such a study because the ocean floor record is well documented, Oground truthO exists from high-quality geologic mapping and field structural data, and the convergent margin represents the least complex scenario of fracture zone/trench interaction. The results of this study can provide a model for other convergent margins worldwide where the tectonics are more complicated. Furthermore, this approach, using an ERS-1 SAR mosaic, will serve as a prototype for SAR-based structural mapping in ice-covered terrain that should prove useful when RADARSAT data becomes available.

摘要 该奖项支持一个利用欧洲ERS-1卫星合成孔径雷达数据对南极半岛进行结构分析的项目。 该项目是将合成孔径雷达数据用于大面积冰雪覆盖地区地质和地球物理调查的示范。 南极半岛的新生代构造演化经历了一个简单的正交板块俯冲的历史，其间，以断裂带为界的南极尖脊段从南向北沿着会聚边缘连续碰撞。 有人提出，俯冲断裂带反映在南极半岛的地质和构造分段，因此，上，下板块之间的直接机械相互作用沿着俯冲边缘建议。 利用ERS-1合成孔径雷达对整个南极半岛进行的天气合成孔径雷达镶嵌图绘制的结构图应能记录任何断裂带进入大陆地壳的区域连续性以及半岛内可能与这些断裂带相连的结构的任何系统变化。 目的是系统地评价俯冲断裂带对上板块沿着会聚边缘的影响。 南极半岛为这类研究提供了无与伦比的机会，因为海底记录有据可查，高质量的地质测绘和实地结构数据提供了Oground truth O，会聚边缘代表了断裂带/海沟相互作用最不复杂的情况。 这一研究成果可为世界范围内构造更为复杂的会聚边缘提供一个模式。 此外，这种使用ERS-1合成孔径雷达镶嵌图的方法将作为在冰雪覆盖的地形中进行合成孔径雷达结构测绘的原型，在雷达卫星数据可用时，这种方法将证明是有用的。