radiogenic argon

radiogenic argon

[¦rād·ē·ō¦jen·ik ′är‚gän]
(nuclear physics)
Argon occurring in rocks and minerals that is the result of in-place decay of potassium-40 since the formation of the earth.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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In trying to date the impact from radiogenic argon in a pocket of melted glass, Bogard measured far too high an abundance to give a meaningful age.