:::::: Three major problems with his theory are apparent. First things first - the amount of heat that would have been released from such rapid subduction would have basically boiled the oceans of the world. Secondly - citing mantle tectonics on Venus and comparing it to Earth is like comparing apples and oranges. The Earth has very active plate tectonics, with subduction being helped - or perhaps lubricated would be a better word - by water. Venus has no water and no plate tectonics, something which leads to heat building up in the mantle that can only be released by catastrophic mantle upwellings that seem to resurface the face of the planet periodically. Thirdly, and most fatally for Baumgardner, there's the little issue of the seamounts and islands that form volcanic island chains like Hawaii. Rapid subduction should have led to huge gaps in the chain. The problem is that there aren't any. You can trace the chain from Hawaii to Midway. I think that it goes northwards along the Emperor Seamount chain from there. I'm sorry, but I do not find Baumgardner at all plausible. Thank you for the link though. [[User:Darkmind1970|Darkmind1970]] 09:06, 15 January 2008 (EST) | :::::: Three major problems with his theory are apparent. First things first - the amount of heat that would have been released from such rapid subduction would have basically boiled the oceans of the world. Secondly - citing mantle tectonics on Venus and comparing it to Earth is like comparing apples and oranges. The Earth has very active plate tectonics, with subduction being helped - or perhaps lubricated would be a better word - by water. Venus has no water and no plate tectonics, something which leads to heat building up in the mantle that can only be released by catastrophic mantle upwellings that seem to resurface the face of the planet periodically. Thirdly, and most fatally for Baumgardner, there's the little issue of the seamounts and islands that form volcanic island chains like Hawaii. Rapid subduction should have led to huge gaps in the chain. The problem is that there aren't any. You can trace the chain from Hawaii to Midway. I think that it goes northwards along the Emperor Seamount chain from there. I'm sorry, but I do not find Baumgardner at all plausible. Thank you for the link though. [[User:Darkmind1970|Darkmind1970]] 09:06, 15 January 2008 (EST) |