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首页> 外文期刊>Tectonophysics: International Journal of Geotectonics and the Geology and Physics of the Interior of the Earth >Hotspot volcanism in the southern South Atlantic: Geophysical constraints on the evolution of the southern Walvis Ridge and the Discovery Seamounts
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Hotspot volcanism in the southern South Atlantic: Geophysical constraints on the evolution of the southern Walvis Ridge and the Discovery Seamounts

机译：南部大西洋南部的热点火山：地球物理限制在南威尔维斯山脊的演变和发现海山的演变

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AbstractThe southern Atlantic hosts a variety of magmatic structures, namely the Walvis Ridge, the Discovery Seamounts and the Shona Ridge, which are believed to be related to the evolution/movement of hotspots. Although the basement of the Walvis Ridge has been sampled at different locations, geophysical data are too sparse to provide sufficient information about its deeper structure to compare it with other hotspot tracks. The Discovery Seamounts represent a completely different type feature in a way that it cannot be connected to any onshore volcanic feature. However, geological sampling of the volcanic basement indicates that the petrology of the Discovery track is very similar to Gough Island and the southern branch of Walvis Ridge. Both structures erupted into already existing seafloor and so have been seismically investigated to document how/if an associated thermal anomaly might have modified the underlying and surrounding oceanic crust. Seismic lines for both structures indicate rather normal seismic velocity distributions for oceanic crust. Both, the Walvis Ridge and the largest volcano of the Discovery Seamounts have a maximum thickness in our research area of ~13km. An interesting difference between these structures is a high velocity cone (>6km/s) at 2.4km depth in the central part of Discovery Seamount. This might indicate a primarily intrusional type of seamount such as has been reported for several similar structures. In contrast the Walvis Ridge velocity structure does not show evidences for a shallow intrusional cone, but seismic velocities typical for oceanic layer 3 at a more or less constant depth level along the entire profile. This might indicate that th
机译：<！[cdata [ 抽象 南部大西洋举办各种魔法结构，即Walvis Ridge，Discovery Seamounts和Shona Ridge，被认为与热点的演变/运动有关。虽然Walvis Ridge的地下室已经在不同的位置进行了采样，但地球物理数据太稀疏，无法提供有关其更深的结构的足够信息，以将其与其他热点轨道进行比较。发现Seamounts以完全不同的类型特征表示它不能连接到任何陆上火山功能。然而，火山地下室的地质抽样表明，发现轨道的岩石学与Gough岛和Walvis Ridge的南部分支非常相似。这两种结构都爆发成现有的海底，因此已经被震动研究，以记录如何/如果相关的热异常可能已经修改了底层和周围的海底。两个结构的地震线表示海壳的相当正常地震速度分布。沃尔维斯山脉和发现海山的最大火山都在我们的研究面积〜13公里的最大厚度。这些结构之间的有趣差异是在Discovery Seamount的中央部分的2.4km深度下的高速锥（> 6km / s）。这可能表明诸如若干类似结构的主要型海山的主要侵入类型。相反，Walvis脊速度结构并未显示出浅侵入锥体的证据，但是沿整个轮廓的或多或少恒定的深度水平的海洋层3典型的地震速度。这可能表明了

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