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See table 1 at the bottom for a list of the most common elements used for Radiometric dating and their corresponding half lives.
Carbon 14 dating: Carbon 14 dating method measures the time since a living organism has died.
It is useless for dating anything older than about 50,000 years.
Third, because carbon 14 forms from cosmic ray bombardment of nitrogen 14 (and decays back into nitrogen 14 through the release of beta particles, i.e., electrons) the effect of variations in cosmic radiation intensity (caused by altitude, depth below the earth's surface, and astronomical events) can be difficult to calibrate.
They are the systematic differences in radioisotope age estimates for the same rock units, as explained in item two above, which can only be reconciled by grossly accelerated decay rates in the past.
There are co-existing uranium and polonium radiohalos in the same mineral grains in granites from around the world.
However, this helium gas easily leaks out of the host minerals.
Thus two age estimates can be calculated for these mineral grains—one based on radioactive decay of uranium to lead, and the other based on the rate at which the helium leaks out of the mineral grains.
And finally, helium gas is a by-product of the radioactive decay of uranium within minerals.Because polonium has a fleeting existence, the polonium radiohalos had to have formed within hours and days.However, the source of the polonium had to be the uranium which was also at the same time producing the uranium radiohalos.When the molten material hardens, argon (produced by later decays of potassium-40) is once again trapped.In this way, formation of an igneous rock resets the potassium-argon clock.