Laser microprobe analyses of fine-grained illite☆
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Cited by (29)
Insights into the genesis of the epithermal Au-Ag mineralization at Rio Blanco in the Cordillera Occidental of southwestern Ecuador: Constraints from U-Pb and Ar/Ar geochronology
2017, Journal of South American Earth SciencesCitation Excerpt :In fact, due to its small grain size, sericite is usually affected by nuclear recoil during its irradiation, thus leading to loss of 39Ar, which is derived from 39K decay. The selective loss of 39Ar results is an increase in the 40Ar/39Ar ratio of the analyzed samples, thus yielding anomalously old ages (Turner and Cadogan, 1974; Harrison and McDougall, 1981; Onstott et al., 1997; Baumgartner et al., 2009). Furthermore, the presence of extraneous argon (excess and inherited 40Ar), may also increase the 40Ar/39Ar ratio, resulting as well in older ages (Dalrymple and Lamphere, 1969).
Molecular modeling of the effects of <sup>40</sup>Ar recoil in illite particles on their K-Ar isotope dating
2015, Geochimica et Cosmochimica ActaCitation Excerpt :During the irradiation-induced 39K to 39Ar transformation, high recoil energy of 39Ar, ∼177 keV (Onstott et al., 1995), allows 39Ar penetration through the clay structure and its escape from the fine crystallites (Smith et al., 1993; Dong et al., 1995). Due to the high 39Ar recoil energy and the resulting substantial 39Ar loss, the application of the 40Ar/39Ar method to clay minerals requires using a microampoule technique of encapsulation (Dong et al., 1995; Onstott et al., 1997), and thus the use of step-heating and plateau-age methods seem problematic (Clauer et al., 2012). The fraction of 39Ar lost from the illite structure during irradiation is a function of its crystallite thickness and grain size equivalent (Dong et al., 1995; see Clauer et al., 2012 for extensive discussion), suggesting that 39Ar recoil not only stimulates the 39Ar nuclei diffusion along the interlayer, but also its penetration through the TOT layers.
Strengthening the link between geochronology, textures and petrology
2003, Earth and Planetary Science LettersThermal <sup>40</sup>Ar/<sup>39</sup>Ar separation of diagenetic from detrital illitic clays in Gulf Coast shales
2000, Earth and Planetary Science LettersBackscattered <sup>39</sup>Ar loss in fine-grained minerals: Implications for <sup>40</sup>Ar/<sup>39</sup>Ar geochronology of clay
2000, Geochimica et Cosmochimica ActaFault gouge dating: History and evolution
2018, Clay Minerals
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Paper presented at the 1996 Spring Meeting of the American Geophysical Union held in Baltimore, Maryland, USA, on April 23, 1996.