TheKing Island Pluton is a mid-to-lateMioceneintrusion ofsyenite andalkaligranite on theCentral Coast ofBritish Columbia, Canada. It is over20 km (12 mi) long and2.5 km (1.6 mi) wide, extending fromKing Island in the west to the mainland in the east. Thepluton is exposed in1,000 m (3,300 ft) cliffs along theDean andBurke channels west ofBella Coola.[1]
The King Island Pluton ispetrographically similar to theshield volcanoes in the centralAnahim Volcanic Belt. As a result, the pluton is thought to represent themagma chamber of an extinct volcanic centre that has since eroded away. At the time of its formation, the pluton was emplaced2 to 5 km (1.2 to 3.1 mi) below the surface.[1]
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