40 Ar- 39 Ar stepheating studies of clay concentrates from Irish orebodies

Details 40 Ar- 39 Ar stepheating studies of clay concentrates from Irish orebodies 40 Ar- 39 Ar stepheating studies of clay concentrates from Irish orebodies

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978gecoa..42.1851h&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 42, Issue 12, pp.1851-1858

Physics

5

Scientific paper

40 Ar- 39 Ar stepheating analyses of clay concentrates from the Gortdrum and Tynagh orebodies (Ireland) previously dated by conventional K-Ar, indicate major losses of 39 Ar (32-45%) and rad. 40 Ar (25-35%) during the irradiation. The proportion of rad. 40 Ar loss, unlike that of 39 Ar, increases with J -value. The difference between 39 Ar and rad. 40 Ar proportion losses is related to the mineralogy and grain intimacy. These also affect the stepwise release patterns--the Gortdrum concentrates yield age spectra very consistent with 39 Ar recoil predictions, whereas the Tynagh concentrates in which the grains are intimately intergrown, show no clear evidence for 39 Ar recoil depletion in the K-rich phases. The difference is resolvable if illite argon release is not a simple volume diffusion type process under vacuum conditions.

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