Generation and age of early Archaean greenstone belt remnants in the southeastern Kaapvaal craton of South Africa

该项目将调查皮特·雷蒂夫镇附近卡普瓦尔克拉通东南部暴露的几个小绿岩遗迹中的表壳岩和相关花岗岩类岩石。所用方法包括野外调查、单颗粒锆石定年、地球化学以及Hf和Nd同位素体系分析。我们以前的工作已经确定了CA。3530-3550和CA。巴伯顿绿岩带中的长英质变质火山单元和斯威士兰的几个绿岩遗迹，而皮特·雷蒂夫附近的上述绿岩遗迹没有年龄数据。我们的目的是建立年龄，岩石成因和演化的合适的岩性在上述绿岩残留物和测试的假设，这些，连同巴伯顿绿岩带，曾经是一个广泛的早白垩世大陆溢流玄武岩序列的一部分，覆盖了大部分的东南部Kaapvaal克拉通，类似于已提出的东皮尔巴拉在西澳大利亚州。

This project will investigate supracrustal and associated granitoid rocks in several small greenstone remnants exposed in the southeastern Kaapvaal craton near the town of Piet Retief. Methods used will be field investigations, single zircon dating, geochemistry, as well as the analysis of Hf and Nd isotopic systems. Our previous work has identified ca. 3530-3550 and ca. 3445 Ma felsic metavolcanic units in the Barberton Greenstone Belt and several greenstone remnants in Swaziland, whereas there are no age data for the above greenstone remnants near Piet Retief. Our aim is to establish the age, petrogenesis and evolution of suitable lithologies in the above greenstone remnants and to test the hypothesis that these, together with the Barberton Greenstone Belt, were once part of an extensive early Archaean continental flood basalt sequence covering a large part of the southeastern Kaapvaal craton, similar to what has been proposed for the East Pilbara terrane in Western Australia.