Ad
related to: mantle plume hotspot locations genshin impact enkanomiyawutheringwaves.kurogames-ads.com has been visited by 10K+ users in the past month
Search results
Results From The WOW.Com Content Network
A mantle plume is a proposed mechanism of convection within the Earth's mantle, hypothesized to explain anomalous volcanism. [2] Because the plume head partially melts on reaching shallow depths, a plume is often invoked as the cause of volcanic hotspots, such as Hawaii or Iceland, and large igneous provinces such as the Deccan and Siberian Traps.
OJP formed quickly over a mantle plume head, most likely the then newly formed Louisville hotspot, followed by limited volcanism for at least 30 million years.The extant seamounts of the Louisville Ridge started to form 70 Ma and have a different isotopic composition, and therefore a shift in intensity and magma supply in the plume must have occurred before that.
There is an ongoing discussion about whether the hotspot is caused by a deep mantle plume or originates at a much shallower depth. [3] Recently, seismic tomography studies have found seismic wave speed anomalies under Iceland, consistent with a hot conduit 100 km (62 mi) across that extends to the lower mantle.
It was later postulated that hotspots are fed by streams of hot mantle rising from the Earth's core–mantle boundary in a structure called a mantle plume. [6] Whether or not such mantle plumes exist has been the subject of a major controversy in Earth science, [4] [7] but seismic images consistent with evolving theory now exist. [8]
An example of plume locations suggested by one recent group. [38] Figure from Foulger (2010). [3] Many different localities have been suggested to be underlain by mantle plumes, and scientists cannot agree on a definitive list. Some scientists suggest that several tens of plumes exist, [38] whereas others suggest that there are none. [3]
The volcanism is caused by the African Plate moving slowly over a hotspot in the Earth's mantle. A hotspot (the Canary hotspot) is the explanation accepted by most geologists who study the Canary Islands. [33] [34] A relatively hot mantle plume associated with this hotspot is thought to be rising through the mantle under La Palma and El Hierro ...
Yellowstone hotspot Nördlinger Ries (14.5-14.3) Burdigalian: 20.44 Aquitanian: 23.03 * Shield volcanoes of Ethiopia [h] Antarctic ice sheet complete Paleogene: Oligocene: Chattian: 28.1 Ethiopian and Yemen traps (31–30) [h] Fish Canyon Tuff (27.51) [i] Rupelian: 33.9 * Chesapeake Bay impact crater (35.5) [j] Antarctic ice sheet expands ...
Map of hotspots. Iceland is number 14. The geology of Iceland is unique and of particular interest to geologists. Iceland lies on the divergent boundary between the Eurasian plate and the North American plate. It also lies above a hotspot, the Iceland plume. The plume is believed to have caused the formation of Iceland itself, the island first ...