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Clay Minerals; June 2001; v. 36; no. 2; p. 227-235
© 2001 Mineralogical Society of Great Britain and Ireland
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Research Paper

Extracting K-Ar ages from shales: the analytical evidence

N. CLAUER1,* and S. CHAUDHURI2

1 Centre de Géochimie de la Surface (CNRS-ULP), Ecole et Observatoire des Sciences de la Terre, 67084-Strasbourg France, and 2 Department of Geology, Kansas State University, Manhattan, KS 66056, USA

* E-mail: nclauer{at}illite.u-strasbg.fr

(Received 22 December 1999; revised 21 December 2000)

The relationship between the K-Ar dates of mixed natural clays and the ratios of detrital and diagenetic components follows in most cases a linear trend, which agrees with the theory when the K2O contents of the end-members are similar. However, significant deviations from a linear trend may occur and take the form of poorly-defined concave curves. The absence of a linear trend is less likely to be due to the imprecise determination of the ratio between the two end-members than to heterogeneities of the natural samples which may arise from complex K-Ar evolutions of the detrital and diagenetic end-members. The straight-line approach is of limited use in the definition of diagenetic ages in shales by extrapolating linear trends to diagenetic end-members.

KEYWORDS: K-Ar dating, illitization, shales




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N. Clauer, N. Clauer, D. Rousset, and J. Srodon
MODELED SHALE AND SANDSTONE BURIAL DIAGENESIS BASED ON THE K-AR SYSTEMATICS OF ILLITE-TYPE FUNDAMENTAL PARTICLES
Clays and Clay Minerals, October 1, 2004; 52(5): 576 - 588.
[Abstract] [Full Text] [PDF]


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