Concordance between K-Ar ages ages of zircon in Cretaceous of K-feldspar granitic rocks and fission-track from Japan

The closure temperature for zircon in the fission-track dating has been poorly estimated because of interpolation between minerals with very different closure temperatures. We find that K-Ar ages and fission-track ages of coexisting K-feldspars and zircons in Cretaceous granitic rocks from Japan are con cordant within the experimental errors, with the exception of a few cataclastically deformed samples near the Median Tectonic Line. The concordance between the two systems suggests that the closure tem perature for zircon in the fission-track system may be lower than 200°C.

[1]  Anthony J. Hurford,et al.  Standardization of fission track dating calibration: Recommendation by the Fission Track Working Group of the I.U.G.S. Subcommission on Geochronology , 1990 .

[2]  F. Richter,et al.  The 40Ar/39Ar thermochronometry for slowly cooled samples having a distribution of diffusion domain sizes , 1989 .

[3]  A. Matsumoto,et al.  Isotopic ages of rocks along the Median Tectonic Line in the Kayumi area, Mie Prefecture , 1989 .

[4]  N. Lal,et al.  Fission track thermochronologic analysis of the Ryoke belt and the median tectonic line, southwest Japan , 1988 .

[5]  M. Heizler,et al.  The age and cooling history of the Chain of Ponds and Big Island Pond plutons and the Spider Lake Granite, west-central Maine and Quebec , 1988 .

[6]  H. Takagi,et al.  Isotopic ages of rocks and intrafault materials along the Median Tectonic Line - An example in the Bungui-toge area, Nagano Prefecture. , 1988 .

[7]  A. Hurford,et al.  Fission-track age of the tuffs of the Buluk member, Bakate formation, Northern Kenya: A suitable fission-track age standard , 1987 .

[8]  J. Gerald,et al.  Saddle-shaped 40Ar39Ar age spectra from young, microstructurally complex potassium feldspars , 1986 .

[9]  A. Hurford.  Cooling and uplift patterns in the Lepontine Alps South Central Switzerland and an age of vertical movement on the Insubric fault line , 1986 .

[10]  A. Hayashida,et al.  Fission Track Dating of the Volcanic Ash Layers in Continental Deposits at Salla, Bolivia: Re-examination , 1986 .

[11]  A. Fujiyoshi.  The obliquity of K-feldspar from schists, gneisses, and granites in the north-eastern part of the Hida metamorphic belt, central Japan , 1984, Mineralogical Magazine.

[12]  A. Gleadow.  FISSION-TRACK DATING METHODS - WHAT ARE THE REAL ALTERNATIVES , 1981 .

[13]  A. Gleadow,et al.  Fission track dating, thermal histories and tectonics of igneous intrusions in East Greenland , 1979 .

[14]  R. Armstrong,et al.  Geochronology and thermal history of the Coast Plutonic Complex, near Prince Rupert, British Columbia , 1979 .

[15]  C. Naeser,et al.  Fission-track dating of apatite and zircon: an interlaboratory comparison , 1981 .

[16]  K. Foland.  Ar40 diffusion in homogenous orthoclase and an interpretation of Ar diffusion in K-feldspars , 1974 .

[17]  Martin H. Dodson,et al.  Closure temperature in cooling geochronological and petrological systems , 1973 .