Composition and Origin of Pre-3-Ga-Old Supracrustal Rocks inSwaziland: An Index to Early Continental Evolution

斯威士兰前 3 Ga 古老表壳岩石的成分和起源：早期大陆演化的指标

• 批准号: 9103049
• 负责人: Kent Condie
• 金额: $ 4.98万
• 依托单位: New Mexico Institute of Mining and Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-07-01 至 1994-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9103049&HistoricalAwards=false
• 关键词: Composition; Origin; Pre; Ga; Old

This project involves detailed field, geochemical and petrographic study of old supracrustal rocks associated with the Ancient Gneiss Complex in Southern Africa, in order to identify protoliths, to characterize the mantle sources of mafic igneous rocks, and to determine the composition of sediment sources. Investigation will involve lithologic analyses of mapped supracrustal successions in Swaziland; petrographic studies; major and trace element analyses of terrigenous metasediments and metavolcanics; and Nd isotopic studies of metasediments. Results should be important in constraining the tectonic setting of these rocks, as well as enhancing our understanding of the origin and evolution of the early continental crust in southern Africa.

该项目涉及详细的野外、地球化学和 古表壳岩的岩相学研究 南部非洲的古代片麻岩杂岩，以确定 原岩，以表征镁铁质火成岩的地幔来源 岩石，并确定沉积物来源的组成。 调查将涉及映射的岩性分析 斯威士兰的表壳岩序列;岩石学研究; 陆源沉积物的常量和微量元素分析， 变质火山岩和变质沉积物的Nd同位素研究。 结果 应该是重要的约束构造环境的 这些岩石，以及加强我们对起源的理解， 以及南部非洲早期大陆地壳的演化。