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

该项目涉及对与南部非洲古片麻岩杂岩有关的古老表壳岩石进行详细的野外、地球化学和岩石学研究，以确定原岩，确定镁铁质火成岩的地幔来源，并确定沉积物来源的组成。调查将涉及对斯威士兰绘制的表壳层序的岩石学分析；岩石学研究；陆源变沉积和变火山岩的主要元素和微量元素分析；以及变沉积的Nd同位素研究。这些结果对于约束这些岩石的构造环境，以及加强我们对南部非洲早期陆壳的起源和演化的了解，应该是重要的。

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.