"A forthcoming paper in Geology Today (APJones, Feb 2002), revives the idea that the distinctive hottest lavas on Earth may in fact be the products of large impacts"
...
"It can explain many of the unique characteristics of komatiites, including (1) the required very high degree of partial melting of mantle peridotite (2) the removal of the need to provide a mechanism for storage of such hot melts prior to eruption (3) their association with diverse tectonic settings and (4) their quench spinifex textures which suggest emplacement as crystal-free liquids. This provides an alternative explanation to the currently popular origin of mantle plumes, whose deep origins have attracted growing criticism, as summarised by Herman Burchard (CCNET: 9 March 2001). It also sidesteps the debate on "wet" versus "dry" peridotite as sources of komatiites."
From CCNet:
http://abob.libs.uga.edu/bobk/ccc/cc040802.html