Mt st helens eruption carbon dating Free text hot chat with singel chat room free
On May 18, 1980, a tremendous landslide on the northern side of Mount St.
Helens in Washington state uncapped a violent volcanic eruption, completely altering the surrounding landscape.
The lava dome at Mount St Helens provides a rare opportunity for putting radioisotope dating to the test.
It was one of those experiences that was well worth every exhausting moment!
For example, the rapid outflow from the volcano caused massive amounts of sediment to fill in the entire valley adjacent to the mountain.
And a 1982 dam breach of the snow-melt lake that had formed in the mountain's crater caused a catastrophic flood that tore a gash through those fresh deposits from two years earlier.
For example, we need to know how much ‘daughter’ was present in the rock when it formed.
In most situations we don’t know since we didn’t measure it, so we need to make an assumption—a guess.
Actually, the present lava dome at Mount St Helens is the third dome to form since the 1980 eruption, the previous two having been blasted away by the subsequent eruptions.
Experts at the time of the 1980 eruption predicted that the area would take perhaps hundreds of years to rebound.
Yet after only 20 years, biologists noted the speedy recovery of plants and animals on what had been a vast moonscape.
Contrary to what is generally believed, it is not just a matter of measuring the amount of potassium-40 and argon-40 in a volcanic rock sample of unknown age, and calculating a date.
Unfortunately, before that can be done, we need to know the history of the rock.