Identification of excess 40Ar by the 40Ar/39Ar, age spectrum technique

Details Identification of excess 40Ar by the 40Ar/39Ar, age spectrum technique Identification of excess 40Ar by the 40Ar/39Ar, age spectrum technique

Oct 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976e%26psl..32..141l&link_type=abstract

Earth and Planetary Science Letters, Volume 32, Issue 2, p. 141-148.

Physics

36

Scientific paper

40Ar/39Ar incremental heating experiments on igneous plagioclase, biotite, and pyroxene that contain known amounts of excess 40Ar indicate that saddle-shaped age spectra are diagnostic of excess 40Ar in igneous minerals as well as in igneous rocks. The minima in the age spectra approach but do not reach the crystallization age. Neither the age spectrum diagram nor the 40Ar/36Ar versus 39Ar/36Ar isochron diagram reliably reveal the crystallization age in such samples.

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