Hotspots, Mantle Plumes and Hawaiian Volcanism

What is the relationship between plate tectonics and landform development?

Moving plates deform Earth’s surface, creating major landforms such as mountain chains, volcanic features and deep-sea trenches at/around plate boundaries.

What is a mantle plume?

A mantle plume is a column of unusually hot, rising mantle material.

It can generate magma and volcanism away from plate boundaries, creating a hotspot.

Why are hotspots important to plate tectonic theory?

They demonstrate that volcanism can occur within plates, not only at plate boundaries.

What are the limitations of the mantle plume/hotspot explanation?

Hotspot theory explains the age progression and linear volcanic chain well, but exact nature, origin and behaviour of mantle plumes remain debated.

What does the age-distance relationship of Hawaiian volcanoes show?

Volcanoes become progressively older with distance from Kilauea.

It’s approximately linear, indicating relatively consistent Pacific Plate movement of about 80mm/year.