Plateau mountains are just like dome mountains, however type as colliding tectonic plates push up the land with out folding or faulting. Volcanic mountains form when molten rock from deep contained in the Earth erupts by way of the crust and piles up on itself. The islands of Hawaii have been formed by undersea volcanoes, and the islands seen above water right now are the remaining volcano tops. Well-recognized volcanoes on land include Mount St. Helens in Washington State and Mount Fuji in Japan. Sometimes volcanic eruptions break down mountains instead of constructing them up, like the 1980 eruption that blew the highest off Mount St. Helens.
40Ar/39Ar ages of one hundred fifteen to 120 million years ago obtained from and geochemical analyses of the K2 Gneiss show that it’s a metamorphosed, older, Cretaceous, pre-collisional granite. Later, the K2 Gneiss was then intruded by leucogranite dikes and finally exhumed and … Read More