The Macdonald hotspot is a volcanic hotspot in the southern Pacific Ocean. The hotspot was responsible for the formation of the Macdonald Seamount, and possibly the Austral-Cook Islands chain. It is named after Gordon Macdonald. It experienced a second eruption in 1989 (ibid).
Macdonald seamount has a shallow summit below sea level, at approximately 20m deep. It erupted explosively in 1987, during which a specimen of floating lava composed of alkali basalt was sampled by researchers on the R/V Melville and subsequently analyzed. It experienced a second eruption in 1989.
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- W. Jason Morgan and Jason Phipps Morgan. Plate velocities in hotspot reference frame: electronic supplement. p. 111. Retrieved 2010-04-23.
- K.H. Rubin and J.D. Macdougall (1989). "Submarine magma degassing and explosive magmatism at Macdonald (Tamarii) seamount". Nature 341 (6237): 50–52. doi:10.1038/341050a0.
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