On/offshore deep electrical conductivity structure to investigate the Walvis Ridge magmatism and its interaction with the Kaoko Mobile Belt in northern Namibia. (ELCONA)

陆上/海上深部导电结构，用于研究沃尔维斯海岭岩浆作用及其与纳米比亚北部卡奥科移动带的相互作用。

• 批准号: 172801653
• 负责人: Dr. Marion Jegen-Kulcsar
• 金额: --
• 依托单位: GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/172801653?language=en
• 关键词: offshore; deep; electrical; conductivity; structure

We propose an amphibian magnetotelluric (MT) experiment to image the subsurface electrical conductivity structure of the passive continental margin of northern Namibia. The main E-W profile begins off-shore along the Walvis ridge, crosses on-shore all major tectono-stragraphic units of the Kaoko Belt and continues into the Congo Craton. With this proposal, we will for the first time (i) combine on- and offshore MT measurements in a passive margin setting and (ii) be able to integrate electrical conductivity with deep seismic data along the entire length of an amphibian profile. The Kaoko Belt in northern Namibia is characterized by large NNW striking structures generated during late Neoproterozoic continental collision. These old regional structures played an important role in the tectonic evolution of the Kaoko Belt and are intimately related with the evolution of adjacent marginal Walvis basin. Where the Walvis ridge meets the continental crust, gabbroic complexes and basic dykes intersect with the flood volcanics and the Etendeka rocks. With this proposal we intend to determine (i) along-strike variability, homogeneity, and extent of magmatic rocks (ii) the influence of pre-existing structure on the emplacement of magmas (iii) a complete deep electrical conductivity section of a passive continental margin and the adjacent continental lithosphere.

我们提出了一个两栖动物大地电磁（MT）实验成像的地下电导率结构的被动大陆边缘的北方纳米比亚。主要的东西向剖面从近海沿着沃尔维斯海岭开始，在岸上穿过卡奥科带的所有主要构造-地层单元，并继续进入刚果盆地。有了这个建议，我们将首次（i）在被动边界设置中将联合收割机陆上和海上MT测量相结合，以及（ii）能够将电导率与沿沿着两栖剖面的整个长度的深层地震数据相结合。纳米比亚北方的Kaoko带以新元古代晚期大陆碰撞形成的北北西向大型构造为特征。这些古老的区域性构造在可可带的构造演化中起着重要作用，并与相邻的沃尔维斯边缘盆地的演化密切相关。在沃尔维斯海岭与大陆地壳的交界处，辉长岩杂岩和基性岩墙与泛滥火山岩和埃滕德卡岩相交。通过这一建议，我们打算确定（一）沿走向的变化，均匀性和范围的岩浆岩（二）的影响，预先存在的结构上的岩浆侵位（三）一个完整的深电导率部分的被动大陆边缘和邻近的大陆岩石圈。