This is approximately 2,500 times as much Ar as is found in natural muscovite.
Thus under certain conditions Ar can be incorporated into minerals which are supposed to exclude Ar when they crystallize. envisage noble gases from the mantle (and the atmosphere) migrating and circulating through the crust, so there should be evidence of excess in crustal rocks and their constituent minerals could well be the norm rather than the exception.
The K or alpha emission by calcium (Zito and Davis, 1981).
By virtue of its being a noble gas, it is relatively unreactive.
Because it is present within the atmosphere, every rock and mineral will have some quantity of Argon.
represents primordial Ar carried from source areas in the earth's mantle by the parent magmas, is inherited by the resultant volcanic rocks, and thus has no age significance.
However, are all other rocks in the earth's crust also susceptible to "contamination" by excess emanating from the mantle?
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Congratulations to Susie on the well-deserved citation!
This is not only true for recent and young volcanics, but for ancient volcanics such as the Middle Proterozoic Cardenas Basalt of eastern Grand Canyon. In conclusion, the fact that all the primordial argon has not been released yet from the earth's deep interior is consistent with a young Earth.