Mathematics – Logic
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994e%26psl.123...95m&link_type=abstract
Earth and Planetary Science Letters, Volume 123, Issue 1-3, p. 95-104.
Mathematics
Logic
22
Scientific paper
The release of excess 40Ar (40ArE) from virtually all alkali feldspars at low temperatures ( < 800°C) during 40Ar/39Ar step-heating experiments obscures potentially valuable age and thermal history information. We report a method that takes advantage of the differential release of 40ArE between contiguous isothermal heating steps, due to the decrepitation of fluid inclusions, and which permits derivation of a correction for the contaminating argon. Differences in age and Cl/K between successive temperature pairs commonly yield a single, well-correlated array on a Δ(40Ar*/K) versus Δ(Cl/K) plot that identifies the Cl-correlated composition of 40ArE (40ArE/Cl) affecting that sample. Eighteen of the twenty K-feldspar samples we have measured yield a single 40ArE/Cl component, that varies from 1.1 × 10-3 to 4.2 × 10-6, making possible recovery of otherwise unobtainable thermochronological information. The upper bound on the 40ArE/Cl distribution of ~ 10-3 may reflect Ar saturation of pore fluids, or the maximum duration between deuteric alteration and cooling below Ar closure in K-feldspar.
Chen Wenji
Grove Marty
Harrison Mark T.
Heizler Matthew T.
Lovera Oscar M.
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