@Herald,
Quote: simply take some magma samples from Iceland or Hawaii (that contain carbon) and date the solidified magma by carbon dating ...
I repeat my question. Why are you CERTAIN that there even is carbon in the magma? Every magma is different and there are many many types and chemistries out there.
We have much more accurate techniques to study and date magmas that overlie each other . Some don't even involve isotopic analyses.
(I guess youre getting at the trick that some Creationists did in trying to "date" a fresh mgma by K/Ar and finding out that it was 2 million years old. The reason that happened is because the samplers hd no idea what they were doing and didn't take any reference samples to see whether there were any "older" minerals mixed in the melt (After all, magmas are often just re-"cycled" masses of former rocks and could often appear older than they are..
If you have a point that you wish to make, please make it and then let me comment on it. Youre so caught up on "carbon dating" that Im not sure you even have an idea of what its about.
Still, if I were sampling new lavas I would first use a camera and a stratigraphic sequence that tells me the age by whats "destroyed"
Mt St Helens can be dated (inaccurately, ) by using isotopic means, but the errors introduced by "mixed" rocks means that somebody is wasting project money.
When dating eruptions or floods or glaciers or even earthquakes, the best "dating" techniques for recent events is to search and see (for the unique layer of detritus that relates to the event) whether anything like trees, , soil layers, cultural deposits or buildings, or any erosion surface , is affected by the event.
It IS like having a camera that identifies the natural or man-made item that was clearly destroyed or marked by the event.
We normally try to use the simplest and most easily interpreted VALIID technique in geochronology.
Your deeply in my court and your sounding silly by demanding Carbon 14 methods be employed where they may not even be valid or necessary.