Tectonic Assembly of Gondwanaland, Northern Namibia

纳米比亚北部冈瓦纳大陆的构造组合

• 批准号: 9506769
• 负责人: Paul Hoffman
• 金额: $ 14.99万
• 依托单位: Harvard University
• 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: 1995-08-15 至 1998-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9506769&HistoricalAwards=false
• 关键词: Tectonic; Assembly; Gondwanaland; Northern; Namibia

Recent hypotheses suggest that the breakup of a single supercontinent at about 750 Ma has led to the origin of several independent continents now widely scattered over the earth. It poses testable models for identifying the former extent and connections of these continents and gives new meaning to previously identified intercontinental (eg. Pan-African/Brasiliano and Grevillian/Kibaran) orogenic systems. The work will focus on a unique triple junction exposed in the Namib Desert on the coastal escarpment of northern Namibia. This key locations is near the center of the hypothesized supercontinent. The initial focus of the project is on the foreland thrust and fold belts of the southern and western Congo margins , involving sequences related to rifting, passive-margin subsidence, terrane accretion and terminal collision. Pesults will provide essential data to reconstruct the tectonic history of this area and to allow a rigorous test of the hypothesis that these events are part of a supercontinent breakup that has led to the present distribution of continental crust.

最近的假设表明，在750 Ma左右，单个超大陆的分裂导致了现在广泛分布在地球上的几个独立大陆的起源。它提出了可检验的模型，用于确定这些大陆以前的范围和联系，并赋予以前确定的洲际（例如：洲际）新的意义。泛非/巴西利亚和格雷维利安/基巴兰造山系。这项工作将集中在纳米比亚北部沿海悬崖上纳米比亚沙漠中一个独特的三重交界处。这个关键位置靠近假设的超大陆的中心。项目初期重点研究刚果南缘和刚果西缘的前陆逆冲褶皱带，涉及裂谷、被动边缘沉降、地体吸积和末端碰撞等序列。结果将为重建该地区的构造历史提供必要的数据，并允许对这些事件是导致当前大陆地壳分布的超大陆分裂的一部分的假设进行严格的测试。