A Mantle Plume is a proposed convection mechanism of abnormally hot rock within the Earth's mantle. In which huge 'mushroom' shaped plumes of molten rock rise, by thermal convection, towards the surface. From depths of around 3,000Km, and creating volcanic 'hotspots' - e.g Hawaii, the Azores, Iceland, Yellowstone etc.
The concept of deep-mantle plumes is typically embedded in Earth science courses at all levels. It is commonly presented as a problem-free fact in most textbooks and popular science books though its basic theory is usually neglected.
Source : MantlePlumes.org
The main problem with the standard accepted theory is that, since its proposal, many studies have shown that real-world examples often don't meet the key characteristics of the model. Especially in chains of volcanic islands that have been found to originate from different time periods.
Two other prominent theories to explain volcanic hotspots are the 'Plate Hypothesis' and the 'Impact Hypothesis' - see Wikipedia
Also see :
Ideas for new topics, and suggested additions / corrections for older ones, are always welcome.
If you have skills or interests in a particular field, and have suggestions for Wikenigma, get in touch !
Or, if you'd like to become a regular contributor . . . request a login password. Registered users can edit the entire content of the site, and also create new pages.
( The 'Notes for contributors' section in the main menu has further information and guidelines etc.)
You are currently viewing an auto-translated version of Wikenigma
Please be aware that no automatic translation engines are 100% accurate, and so the auto-translated content will very probably feature errors and omissions.
Nevertheless, Wikenigma hopes that the translated content will help to attract a wider global audience.