Volcanism and sea level fall
If there were decompression melting of magma in the West Antarctic volcanic province as the icesheet thinned, that would not be good news.
If the geological Society link in the article doesn’t work for you, try this one; http://sp.lyellcollection.org/content/early/2017/05/26/SP461.7
Most volcanic activity stems from the rise of hot, deep rock, usually within the mantle. Pressure suppresses partial melting, so as hot rock rises the greater the chance that it will begin to melt without any rise in its temperature. That is the reason why mantle plumes are associated with many volcanic centres within plates. Extension at oceanic ridges allows upper mantle to rise in linear belts below rift systems giving rise to shallow partial melting, mid-ocean ridge basalts and sea-floor spreading. These aren’t the only processes that can reduce pressure to induce such decompression melting; any means of uplift will do, provided the rate of uplift exceeds the rate of cooling at depth. As well as tectonic uplift and erosion, melting of thick ice sheets and major falls in sea level may result in unloading of the lithosphere.
During Messinian Stage of the late Miocene up to 3 km…
View original post 471 more words