Define mantle plume and explain its role in plate tectonics?(Answer in 150 words)
Answers
Answer:
Mantle plume is an upwelling of abnormally hot rock within the earth's mantle which carries heat upward in narrow, rising columns, driven by heat exchange across the core-mantle boundary. ... It is a secondary way through which earth loses heat.
Answer:
Mantle plumes transport primordial mantle material from below the zone of active convection; produce time-progressive volcanic chains; break up continents; and act as a driving force for plate tectonics.
Explanation:
A mantle plume is an upwelling of abnormally hot rock within the Earth’s mantle.
It is a large column of hot rock rising through the mantle.
• The heat from the plume causes rocks in the lower lithosphere to melt.
• The largest (and most persistent) mantle plumes are presumed to form where a large volume of mantle rock is heated at the core-mantle boundary, about 1,800 miles below the surface, although smaller plumes may originate elsewhere within the mantle.
• The rising column of hot rock reaches the base of the lithosphere, where it spreads out, forming a mushroom-shaped cap to the plume.
• The overlying lithosphere is pushed up and stretched out as the plume cap spreads.
• This has led to the hypothesis that mantle plumes contribute to continental rifting and the formation of ocean basins.
• In the context of the alternative “Plate model”, continental breakup is a process integral to plate tectonics, and massive volcanism occurs as a natural consequence when it onsets.
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