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Argon
Diffusion in Mineral
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Understanding
argon diffusion mechanisms and their kinetics is one of the most important
issues in 40Ar/39Ar geochronology because many of
the applications of 40Ar/39Ar geochronological
technique are developed on the basis of well constrained diffusion rate of
argon in minerals. Fortunately, the sensitivity and resolution of the
analytical instrumentations in the laboratory (laser dating probe and
furnace step-heating technique) allow us to examine these fundamental
problems in 40Ar/39Ar geochronology.
Based on field and experimental data, several projects regarding
argon diffusion in K-feldspar, micas and hornblende, are currently
conducted in the laboratory. |
Publications:
Lo, C.H. and Onstott, T.C. (1989) 39Ar recoil artifacts in
chloritized biotite. Geochim.
Cosmochim. Acta 53, 2697-2711.
Lo, C.H., Onstott, T.C., Chen, C.H. and Lee, T.(1994) An assessment of 40Ar/39Ar
dating for the whole-rock volcanic samples from the Luzon Arc near Taiwan. Chem.
Geol. (Isot. Geosci. Sect.), 114, 157-178.
Lo, C.H. and Lee, C.Y.(1994) 40Ar/39Ar Method of K-Ar Age
Determination of Geological Samples Using Tsing-Hua Open-Pool (THOR) Reactor. Jour.
Geol. Soc. China 37, 143-164.
Lo,
C.H. and Onstott, T.C. (1995) Rejuvenation of K-Ar isotope systems
for minerals in the Taiwan Mountain Belt. Earth Planet. Sci. Lett. 131,
71-98.
Lo,
C.H., Lee, J.K.W. and Onstott, T.C. (2000) Argon Release Mechanisms
of Biotite in vacuo and the role of short-circuit diffusion and recoil. Chemical
Geology 165, 135-166.