Tectonic Evolution of the Antarctic Sector of the Pacific Margin II: Mesozoic and Paleozoic Development of Eastern Marie Byrd Land

太平洋边缘南极段的构造演化II：东部玛丽伯德地的中生代和古生代发育

• 批准号: 8916470
• 负责人: Dennis Kent
• 金额: $ 18.57万
• 依托单位: Columbia University
• 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: 1990-12-01 至 1994-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8916470&HistoricalAwards=false
• 关键词: Tectonic; Evolution; Antarctic; Sector; Pacific

The tectonic evolution of West Antarctica and its relationship to East Antarctica is the most fundamental tectonic problem of the Antarctic continent. It bears on global plate interaction, paleocirculation in the Southern Ocean, paleoenvironment, and paleobiogeography as well as being critical to the development of the continent itself. The joint United States-United Kingdom West Antarctic Tectonics Project (1983-88) has shed considerable light in the tectonic evolution of the Weddell Sea region. This award supports a new tripartite United States-New Zealand- United Kingdom program of the study in Marie Byrd Land for the years 1990-93 to complete our understanding of the tectonic evolution of the southern rim of the Pacific Ocean basin. It will involve field and laboratory investigations designed to elucidate the structure and evolution of Marie Byrd Land crustal block and its relationship to other West Antarctic crustal block, the East Antarctic craton, New Zealand and the Pacific Ocean basin. This study is the major U.S. contribution to the program and involves structural, paleomagnetic, petrologic, and geochronologic investigations bearing particularly on the pre-Cenozoic development of Marie Byrd Land.

西南极洲的构造演化及其与东南极洲的关系是南极大陆最基本的构造问题。它不仅关系到全球板块相互作用、南大洋古环流、古环境和古生物地理，而且对大陆自身的发展也至关重要。美国和英国联合开展的南极西部构造研究项目（1983- 1988）对威德尔海地区的构造演化具有重要意义。该奖项支持了一个新的美国-新西兰-英国三方研究项目，该项目于1990年至1993年在玛丽伯德地进行，以完成我们对太平洋盆地南缘构造演化的理解。它将涉及实地和实验室调查，旨在阐明玛丽伯德地地壳块体的结构和演化及其与其他南极西部地壳块体、南极东部克拉通、新西兰和太平洋盆地的关系。这项研究是美国对该计划的主要贡献，涉及构造、古地磁、岩石学和地质年代学调查，特别是对玛丽伯德地的前新生代发展。