Argon-potassium method of age determination and its application in pre-Cambrian geology

Gerling, E.K.

doi:10.1016/0020-708x(57)90261-2

Cited by 2 publications

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“…Farley et al (1996) modeled relationships between radiogenic 4 He loss and grain size and concluded that (U-Th)/He dating requires "either large crystals, or correction of measured ages for alpha particle ejection". However, according to early studies by Gerling and his colleagues (e.g., Gerling, 1961;Morozova and Ashkinadze, 1971;Ashkinadze, 1980), internal fissures within mineral grains (even if these grains are "large") is a common feature of rock forming minerals (e.g., see Fig. 8); therefore, α-particles could often reside in open tracks and readily escape from mineral grains.…”

Section: (43) Migration Of He Atoms Which Have Been Lost From Amphimentioning

confidence: 99%

Amphibole: A major carrier of helium isotopes in crustal rocks

et al. 2016

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Section: (43) Migration Of He Atoms Which Have Been Lost From Amphimentioning

confidence: 99%

Amphibole: A major carrier of helium isotopes in crustal rocks

et al. 2016

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“…Thus, it is supposed that the P3 and HL populations of the diamond grains have a different origin and radiation history. Similar release kinetics and a spectrum of activation energies are observed for helium during pyrolysis of some radioactive minerals, the lattice of which is damaged by radiation produced as a result of radioactive decay of U and Th (Gerling ; Shukolyukov ). There is experimental evidence showing that the higher the implantation dose of the implanted noble gases in synthetic nanodiamonds, the lower their release temperature (Verchovsky et al.…”

Section: Kinetics Of the Xe‐p3 Releasementioning

confidence: 57%

Kinetics of Xe‐P3 release during pyrolysis of the coarse‐grained fractions of Orgueil (CI) meteorite nanodiamonds

Fisenko

Verchovsky

Semjonova

2014

Meteorit & Planetary Scien

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Abstract-The kinetics of the release of the Xe-P3 component from coarse-grained fractions of Orgueil (CI) meteorite nanodiamonds has been investigated using stepped and isothermal pyrolysis. It has been shown that a first-order chemical reaction diffusion model with a single activation energy cannot provide a satisfactory explanation for the observed retention of Xe-P3 during parent body thermal metamorphism and the kinetics of Xe-P3 release from nanodiamonds during isothermal pyrolysis. Using the activation energy and frequency factor calculated according to this model, it is shown that in the course of thermal metamorphism of the Orgueil meteorite almost the entire Xe-P3 component must have been lost in a very short time (<4 yr at approximately 100°C). However, the calculated retention of Xe-P3 increases significantly if a diffusion model with a spectrum of activation energies is used. In this case, the model can explain not only a high retention of Xe-P3 in the Orgueil nanodiamonds but also the release pattern of the Xe-P3 from Semarkona and Bishunpur nanodiamonds that have experienced a significant gas loss during parent body metamorphism as well as the release of Xe-P3 during isothermal pyrolysis of the Orgueil nanodiamonds. The energetically complicated Xe-P3 distribution is most likely caused by structural damage to the nanodiamond grains or a complex phase composition of carbon in the surface layer of the diamond grains. It is supposed that the structural damage of the diamond grains can have a radiation origin, while the variations of the carbon phase composition in the grain's mantle can be caused by the radiation-induced reactions and/or a thermal effect.

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Argon-potassium method of age determination and its application in pre-Cambrian geology

Cited by 2 publications

References 0 publications

Amphibole: A major carrier of helium isotopes in crustal rocks

Amphibole: A major carrier of helium isotopes in crustal rocks

Kinetics of Xe‐P3 release during pyrolysis of the coarse‐grained fractions of Orgueil (CI) meteorite nanodiamonds

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