Other
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20...61h&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 1, p. 61-64.
Other
Argon Isotopes, Biotite, Earth Crust, Radioactive Isotopes, Grain Size, Tectonics
Scientific paper
The discovery of a 'fossilized' asymmetric radiogenic argon wave (argonami) trapped in single grains of biotite in the contact zones between a diabase dike and the Grenville country rock near Mattawa, Ontario, Canada, is reported. The phenomenon is argued to be the result of the interplay between the partial pressure of the ambient radiogenic argon and the opening and closing (blocking) of biotite to argon movement during the period of thermal and perturbation following the dike intrusion. The occurrence of the argonami phenomenon suggests that, in some instances, the analysis of excess argon may become a useful tool for elucidating complex tectonothermal and fluid-migratory events taking place at plate boundaries and igneous contacts.
Hyodo Hironobu
York Derek
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