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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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Potassium occurs in two stable isotopes (Ar atoms trapped inside minerals.
They are the lower mantle (below 670km), upper mantle, continental mantle lithosphere, oceanic mantle lithosphere, continental crust and oceanic crust, the latter four constituting the earth's crust. A steady-state upper mantle model has been proposed for mass transfer of rare gases, including Ar.
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