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10B - Potassium-Argon Dating
Advanced instruments, rigorous procedures and the use of standard minerals ensure this. No argon has been lost since the time the rock was reset, or set to zero. In rubidium-strontium dating, micas exclude strontium when they form but accept much rubidium. A paradigm is a theory that is so well accepted that no one seriously questions it. The mineral sanidine, the high-temperature form of potassium feldspar , is the most desirable. When these muscovite samples were then dated via normal K-Ar dating techniques, they were measured to have an age of up to 5 billion years since the clock was reset, or set to zero. Research in Hawaii shows that the lava flows on the surface of the ground are able to loose essentially all of the Argon. First of all, Argon is inert. The kinds of rock that this process is thought to work best with is various kinds of igneous rocks, volcanic rock and ash. The rock sample to be dated must be chosen very carefully.REGISTER TO VIEW
They are looking for answers that would fit their present model. Sometimes the whole rock basalt date is reported, but sometimes only a mineral fraction is reported from the basalt, like biotite or sanidine. The potassium-argon age of some meteorites is as old as 4,,, years, and volcanic rocks as young as 20, years old have been measured by this method. If you did research on the subject you should realize that those tests where Argon gas pressure is put onto a heated mica are useless in anything but a laboratory. Examples of such minerals include lepidolite , potassium- feldspar , and late-formed muscovite or biotite from pegmatites preferably of older than 60 Ma.REGISTER TO VIEW
Once the rock cools and hardens, it is considered to be a closed system, because any new Ar 40 that is produced by the breakdown of K40 is trapped inside the rock crystal and cannot get out. Potassium-Calcium Isochrons The common potassium-argon dating process makes use of the decay of 40 K to 40 Ar, even though much more of the 40 K decays to 40 Ca. This is how science normally works.REGISTER TO VIEW
These two papers should make us uncomfortable accepting assumption 2, because we can see that under certain conditions, Argon can be forced into rocks; And yet we are told to accept the assumption that all the Argon is naturally excluded! Comments to: george id. Potassium-Argon Dating Potassium-Argon dating is the only viable technique for dating very old archaeological materials. Then the gas sample is cleaned of all unwanted gasses such as H 2 O, CO 2 , SO 2 , nitrogen and so on until all that remains are the inert gasses , argon among them.REGISTER TO VIEW REGISTER TO VIEW