Macdonald hotspot

From Wikipedia, the free encyclopedia
Jump to: navigation, search
The Macdonald hotspot is the Pacific Ocean, marked 24 on this map.

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.[1] It is named after Gordon Macdonald.[2] 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.[3] It experienced a second eruption in 1989.[3]

References[edit]

  1. ^ W. J. Morgan (1971). "Convection Plumes in the Lower Mantle". Nature 230 (5288): 42. Bibcode:1971Natur.230...42M. doi:10.1038/230042a0. 
  2. ^ W. Jason Morgan and Jason Phipps Morgan. Plate velocities in hotspot reference frame: electronic supplement. p. 111. Retrieved 2010-04-23. 
  3. ^ a b 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.