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

南非卡普瓦尔克拉通东南部早期太古宙绿岩带遗迹的生成和年龄

• 批准号: 381206246
• 负责人: Dr. Yamirka Rojas-Agramonte, Ph.D., since 7/2019
• 金额: --
• 依托单位: Institut für Geowissenschaften
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/381206246?language=en
• 关键词: Generation; age; early; Archaean; greenstone

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.

该项目将调查 Piet Retief 镇附近 Kaapvaal 克拉通东南部暴露的几处小型绿岩遗迹中的表壳和伴生花岗岩。使用的方法包括现场调查、单锆石测年、地球化学以及铪和钕同位素系统分析。我们之前的工作已经确定了大约。 3530-3550 和约。巴伯顿绿岩带中有 3445 Ma 长英质变火山岩单元和斯威士兰的几个绿岩遗迹，而 Piet Retief 附近的上述绿岩遗迹没有年龄数据。我们的目的是确定上述绿岩残余物中合适岩性的年龄、岩石成因和演化，并检验以下假设：这些残余物与巴伯顿绿岩带一起曾经是广泛的早期太古宙大陆溢流玄武岩序列的一部分，覆盖了大部分地区Kaapvaal 克拉通东南部的项目，类似于西澳大利亚东皮尔巴拉地体的提议。