>火山岩的组成变化大大根据岩浆柱之间的距离和口腔的火山岩石形成时?金属成分的岩浆不会大幅改变。我所说的金属的基本成分岩:主要是硅但也包括铁、钙、铝、镁等。我将添加过程会影响金属成分(主要是矿物分离),但我认为它的影响是次要的,当你说的最主要的部分火山喷发。什么可以和变化是挥发性成分。岩浆是气体的枯竭。比如一瓶可乐。当你打开它时,二氧化碳泡沫。可口可乐本身仍然是可口可乐,但其化学变化(和味道不好)因为二氧化碳。岩浆也可能改变氧化态。加之脱气波动可能最终影响从岩浆,矿物质结晶。 > (Or) do the rocks melt and recrystallize frequently as the boundary moves, only attaining their final composition before they are ejected into the air? No. Once a rock crystallises you are going to need quite a lot of energy to melt it again, and this is not a likely process to occur in a system open to the atmosphere where heat is free to leave the volcanic system.