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Electromagnetic, gravimetric and seismic measurements to investigate the Tristan da Cunha hot spot and its role in the opening of the South Atlantic.

Principal Investigators: Dr. Marion Jegen-Kulcsar, Dr. Wilfried Jokat, Dr. Wolfram Geißler

JegenRundeII According to classical plume theory, the Tristan da Cunha hotspot is thought to have played a major role in the rifting of the South Atlantic margins and the creation of the aseismic Walvis Ridge by impinging at the base of the continental lithosphere shortly before or during the breakup of the South Atlantic margins. But Tristan da Cunha is enigmatic, as it cannot be clearly identified as a hot-spot but classifies also highly as a more shallow type of anomaly that may actually has been caused by the opening of the South Atlantic. The equivocal character of Tristan is largely due to lack of geophysical data in this region. To understand the tectonic processes of the opening of the South Atlantic, the formation of the Walvis ridge and to understand, whether Tristan da Cunha is the cause or the consequence of the rifting, it is of central importance to characterize the region around Tristan da Cunha with geophysical data in a more coherent way. We, therefore, propose a multi-disciplinary geophysical study of the region by acquiring marine electromagnetic, active and passive seismics as well as gravity data with the goal to identify the crustal structure and temperature and partial melt anomalies in the upper mantle.