| 词条 | Erebus hotspot |
| 释义 |
The Erebus hotspot is a volcanic hotspot responsible for the high volcanic activity on Ross Island in the western Ross Sea of Antarctica. Its current eruptive zone, Mount Erebus, has erupted continuously since its discovery in 1841.[1] Magmas erupted from the Erebus hotspot are similar to those erupted from hotspots at the active East African Rift in eastern Africa.[1] Mount Bird at the northernmost end of Ross Island and Mount Terror at its eastern end are large basaltic shield volcanoes that have been potassium-argon dated to be 3.8–4.8 and 0.8–1.8 million years old.[1]The Erebus hotspot has been interpreted to be the cause of spreading at the Terror Rift.[1] Its mantle plume, estimated to be {{Convert|250|to|300|km|mi|abbr=on}} in diameter, extends {{Convert|200|km|mi|abbr=on}} below the surface where it changes into a narrow column that further extends {{Convert|400|km|mi|abbr=on}} below the surface.[2] References1. ^1 2 3 Morgan, W.J.; Phipps Morgan, J. (2007) "Plate velocities in hotspot reference frame: electronic supplement". {{Volcanology-stub}}{{regional-geology-stub}}{{RossIsland-geo-stub}}2. ^{{cite journal |last=Gupta|first=Sandeep |first2=Dapeng|last2=Zhaob |first3=S.S.|last3=Raia |date=August 2009 |title=Seismic imaging of the upper mantle under the Erebus hotspot in Antarctica |journal=Gondwana Research|volume=16 |issue=1 |pages=109–118 |url=https://www.sciencedirect.com/science/article/pii/S1342937X09000197 |doi=10.1016/j.gr.2009.01.004}} 3 : Hotspots of the Southern Ocean|Geology of Antarctica|Ross Island |
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