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Mechanisms of Argon Retention in Clays Revealed by Laser 40Ar-39Ar Dating

✍ Scribed by Dong, H.; Hall, C. M.; Peacor, D. R.; Halliday, A. N.


Book ID
121154554
Publisher
American Association for the Advancement of Science
Year
1995
Tongue
English
Weight
999 KB
Volume
267
Category
Article
ISSN
0036-8075

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Existing tectonic models for the evolution of the Usagaran Orogen place much significance on Palaeoproterozoic K-Ar and Rb-Sr ages. Laser 40 Ar/ 39 Ar data from single mica grains from the Isimani Suite near the western margin of the orogen indicate that excess 40 Ar is common in micas and this cast