Collaborative Research: Constraints on Mesoproterozoic Supercontinent Assembly and Plate Dynamics-Studies on the 1.1 Ga Umkondo Large Igneous Province in Southern Africa

合作研究：中元古代超大陆组装和板块动力学的约束——南部非洲1.1 Ga Umkondo大型火成岩省研究

• 批准号: 9909854
• 负责人: Wulf Gose
• 金额: $ 6.82万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-01-15 至 2003-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9909854&HistoricalAwards=false
• 关键词: Collaborative; Research; Constraints; Mesoproterozoic; Supercontinent

9909269 Hanson9909854 GoseSupercontinent assembly and dispersal throughout geologic time represent a fundamental theme in earth history. The Phanerozoic assembly and dispersal of Gondwana and Pangea has been extensively studied but was preceded by an earlier supercontinent, Rodinia, which began to assemble at 1300 Ma, possibly incorporating most or all continental crust by 1000 Ma and began to disperse at 750 Ma. This project focuses on a key element in both the Rodinian and Gondwanan supercontinents which involves a large-scale, poorly understood 1.1. Ga within plate igneous province in the Kalahari craton. One interpretation is that the igneous province, and possible correlatives in Antarctica and Laurentia, originated from a large-scale mantle thermal anomaly or plume near one of the main sites of plate convergence during Rodinia assembly. This project will gather geochronological, paleomagnetic and geochemical data required to test the hypothesis that the Umkondo and Laurentian provinces are expressions of a single large-scale magmatic event. Results will help paleogeographic reconstructions of the neoproterzoic and has implications for formation of large igneous provinces in relation to supercontinent evolution in general.

9909269汉森9909854戈斯超大陆在整个地质时代的聚集和扩散代表了地球历史上的一个基本主题。冈瓦那和盘古大陆显生宙的组装和扩散已经得到了广泛的研究，但在更早的超大陆Rodinia之前，Rodinia于1300 Ma开始组装，可能在1000 Ma时包括大部分或全部陆壳，并于750 Ma开始分散。该项目的重点是罗德尼安和冈德瓦南超大陆的一个关键因素，该因素涉及大规模的、鲜为人知的1.1。喀拉哈里克拉通板块火成岩省内的Ga。一种解释是，火成岩省以及南极洲和劳伦西亚的可能相关性，源于Rodinia组装过程中板块汇聚主要地点之一附近的大规模地幔热异常或热柱。该项目将收集所需的地质年代学、古地磁和地球化学数据，以检验乌姆孔多省和劳伦蒂亚省是单一大规模岩浆事件的表现这一假设。这些结果将有助于新元古代的古地理重建，并对总体上与超大陆演化有关的大型火成岩省的形成具有指导意义。