Geologists have discovered a “ghost plume” rising from the Earth’s mantle beneath eastern Oman. This extraordinary finding adds a new dimension to our understanding of geologic processes. Mantle plumes are dynamic geological features that involve hot rock moving from the core-mantle boundary towards the surface.
They often create new landmasses or cause powerful geothermal activities. Typically, mantle plumes cause surface volcanism; however, in this unusual case, the “ghost plume” exhibits no such activity. The discovery was made by an international team led by seismologist Simone Pilia of King Fahd University of Petroleum and Minerals in Saudi Arabia.
Pilia stumbled upon the plume while analyzing seismic data from the region. He noticed that seismic waves moved more slowly and the material they moved through appeared less rigid in a cylindrical area beneath eastern Oman. Higher temperatures in this region indicated the presence of a mantle plume.
Despite no visible surface volcanism, independent measurements confirmed the existence of a mantle plume, located approximately 660 kilometers below the surface.
Simone Pilia named it “Dani” after his son.
Geologic processes reveal hidden plume
Though Oman does not exhibit typical volcanic activity associated with mantle plumes, other geological factors suggest an anomaly. The region continues to rise in elevation long after tectonic compression should have ended, hinting at the underlying plume’s influence. The existence of the “Dani plume” aligns with models that describe the movement of the Indian tectonic plate during the late Eocene epoch.
If confirmed, this ghost plume would be the first of its kind ever detected and could prompt a re-examination of how much heat is transferring from the core-mantle boundary. This would have profound implications for our understanding of Earth’s geologic history. Mantle plumes have substantial practical consequences.
They can initiate seafloor spreading, act as sources of large mineral deposits, such as nickel and platinum, and even cause global mass extinction events. Understanding ghost plumes could shed light on these processes and aid in locating other such plumes globally, thereby deepening our understanding of Earth’s interior dynamics. This groundbreaking discovery not only broadens the scope of geological science but also underscores the importance of continuous research and exploration into our planet’s inner workings.
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