Mountain-Building Time Cut by Two Thirds

first_imgHow long does it take to build mountains?  The conventional wisdom is that mountain building (orogeny) is a slow, gradual process that takes many millions of years.  A story on Live Science doesn’t deny some millions, but reduces the estimated age of a range in Norway from 40 million to 13 million, and claims the process must have taken place at much cooler temperatures than expected.  “Mountain building quicker than thought” announces the title.  Inferences from argon dating suggest that the rocks were heated for only a short period, perhaps only 10 years.They weren’t there, and they don’t know, but what they do know is that they were surprised by evidence that overturned a belief in a very slow, gradual process.  This is an update on last month’s story (see 06/30/2005 entry) but bears repeating, and noting who was surprised.(Visited 8 times, 1 visits today)FacebookTwitterPinterestSave分享0last_img