权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

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

南极半岛太平洋边缘：安第斯型造山带构造演化的海洋地球物理研究

基本信息

批准号：
8916436
负责人：
Ian Dalziel
金额：
$ 57.7万
依托单位：
University of Texas at Austin
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
1990
资助国家：
美国
起止时间：
1990-06-15 至 1994-05-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=8916436&HistoricalAwards=false
关键词：
Pacific Margin Antarctic Pennisula Marine

项目摘要

This study focuses on several globally important, crustforming 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., MCS, gravity, magnetics, sonobuoys and multi- beam bathymetry) of two parts of the Antarctic Peninsula to 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 towards 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 yet carried out by any nation.

本研究侧重于几个全球重要的，地壳形成造山过程，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，监控监、重力、磁力、声纳浮标和多用途波束测深）的两个部分的南极半岛，阐明南设得兰群岛-布兰斯菲尔德的作用作为安第斯造山带现代类似物的海槽区作为构造运动的一个具体步骤侦察更难接近的，因此更多的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南极海洋地球物理研究尚未进行任何民族