Mechanism of granitoid emplacement in the Pan-African basement of Northern Ethiopia

埃塞俄比亚北部泛非基底花岗岩类侵位机制

• 批准号: 16789105
• 负责人: Professorin Dr. Helga de Wall
• 金额: --
• 依托单位: Institut für Geowissenschaften (IfG)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2005
• 资助国家: 德国
• 起止时间: 2004-12-31 至 2008-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/16789105?language=en
• 关键词: Mechanism; granitoid; emplacement; Pan; African

The general aim of the project is to delimit tectonic events in the Ethiopian part of the Arabian Nubian Shield (ANS) by evalution of the tectonic stress conditions which accompanied and governed the emplacement of granitoids in the Northern basement terrain of Ethiopia. We will apply the anisotropy of magnetic susceptibily method (AMS-mapping) coupled with petrological studies which has become the state of the art method for evaluation of intrusion mechanism of plutons and for determining the tectonic regime during magma emplacement. Focus of our investigations will be the geological setting around the Central Steep Zone, an important high strain zone in the Northern basement terrain which has been interpreted as long-lasting active major tectonic lineament in this part of the ANS. Recent studies have given age constraints and geochemical characteristics for the granitoids in this area (near the city of Axum) which will be valuable background information for a comprehensive model on the late-Neoproterozoic tectonomagmatic evolution in this southerly part of the ANS. Data of this study will be linked to tectonic models for the northern continuation into Eritrea and the Eastern desert of Egypt and for the transition into the Mozambique belt in southern Ethiopia.

该项目的总体目标是通过评估伴随并控制埃塞俄比亚北方基底地形花岗岩类就位的构造应力条件，划定阿拉伯努比亚地盾（ANS）埃塞俄比亚部分的构造事件。我们将应用各向异性磁法（AMS映射）与岩石学研究相结合，这已成为评价侵入岩体机制和确定岩浆侵位期间构造体制的最先进方法。我们调查的重点将是中央陡峭区周围的地质背景，中央陡峭区是北方基底地形中的一个重要的高应变区，被解释为ANS这一部分的长期活跃的主要构造线性构造。最近的研究给出了该地区（阿克苏姆市附近）花岗岩类的年龄限制和地球化学特征，这将是有价值的背景信息的综合模型晚新元古代构造岩浆演化在这南部的ANS。这项研究的数据将被链接到构造模型的北方延续到厄立特里亚和埃及东部沙漠和过渡到莫桑比克带在埃塞俄比亚南部。