Geophysicist Dr Wouter Schellart, of Monash University in Melbourne, and colleagues, report their study of the comings and goings of mountains at subduction zones today in the journal Science.
Ever since plate tectonic theory "Anabolika Definition" was developed, scientists have been puzzled by mountain formation at subduction zones where one tectonic plate slides under the other.
"They didn't understand why there were mountains in the first place and why they went away, in subduction zones," says Schellart.
The researchers have developed for the first time a theory that relates the size of subduction zones to the velocity of the tectonic plates at the plate boundary, which sheds light Masteron For Endurance on mountain appearance and disappearance.
According to this theory the larger the subduction Equipoise Y Trembolona zone at the boundary between the plates, the faster the movement of the subducting plate and "Anadrol 50" the slower the movement of the plate boundary.
"Previously scientists have focused on either the velocities of the plate or the velocities of the plate boundaries . "Oxandrolone Powder India" but they've never found a theory that explains both," says Schellart.
Collapsing mountainsSchellart says his theory is the first to explain the formation and collapse of an Andes like mountain range that once existed down the west coast of North America.
Geologists knew about Oral Steroids With Or Without Food the ancient range, but no one understood why it disappeared and turned into what is today known as the Basin and Range Province.
"50 million years ago, things started to change and the mountain belt started to crumble away and be ripped "Achat Anabolisant Belgique" apart," says Schellart.
He says application of the new theory suggests that as the size of the plate boundary decreased from 14,000 kilometres to its current 1400 kilometres this caused the subducting plate to slow down and the mountain belt to "collapse".
Theory developmentTo develop their theory, Schellart and team first mapped how all the plates and subduction zones around the world were moving and then analysed them to see if there was a pattern.
Using this information, they built a computer model that agreed with current day data measured at subduction zones around the world.
They also found their computer model agreed with historical data from a subduction zone under the North American plate.
Schellart says the theory could be useful in explaining the formation and disappearance of other mountains, such as a major mountain belt that once existed down Australia's east coast, and even the Andes.