Hunting for the Tristan mantle plume – An upper mantle tomography around the volcanic island of Tristan da Cunha
Earth and Planetary Science Letters(2017)
摘要
The active volcanic island Tristan da Cunha, located at the southwestern and youngest end of the Walvis Ridge – Tristan/Gough hotspot track, is believed to be the surface expression of a huge thermal mantle anomaly. While several criteria for the diagnosis of a classical hotspot track are met, the Tristan region also shows some peculiarities. Consequently, it is vigorously debated if the active volcanism in this region is the expression of a deep mantle plume, or if it is caused by shallow plate tectonics and the interaction with the nearby Mid-Atlantic Ridge. Because of a lack of geophysical data in the study area, no model or assumption has been completely confirmed.
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关键词
finite-frequency tomography,ocean-bottom seismometers,upper mantle,hotspot,Tristan da Cunha
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