A Pre-Cambrian Glass from St. Alexis-des-Monts, Quebec
- 1 August 1963
- journal article
- research article
- Published by Cambridge University Press (CUP) in Geological Magazine
- Vol. 100 (4) , 337-344
- https://doi.org/10.1017/s0016756800056077
Abstract
The Pre-Cambrian rocks north of Three Rivers, Quebec, are cut by a major fault in which glassy pseudotachylites have been developed. The glass, which is dark brown in thin section, has a specific gravity of 2.76 and a refractive index of 1.567. It has a similarcomposition to the quartz monzonite in which it occurs. Absolute dating by the potassium-argon method indicates that the glass is 975 million years old. The persistence of thisglass indicates how sluggish devitrification can be when the environment is cool and dry.Keywords
This publication has 6 references indexed in Scilit:
- Radiogenic argon and strontium diffusion parameters in biotite at low temperatures obtained from Alpine Fault uplift in New ZealandGeochimica et Cosmochimica Acta, 1962
- The pseudotachylite of the Gairloch District, Ross-shire, ScotlandAmerican Journal of Science, 1961
- Devitrification of Natural GlassGSA Bulletin, 1961
- Argon-Potassium Ages and the Isotopec Composition of Argon from Meteorites.The Astrophysical Journal, 1958
- 5. The Bearing of Age Determinations on the Relation between the Keewatin and Grenville ProvincesPublished by University of Toronto Press Inc. (UTPress) ,1956
- X.—Frictional Fusion Along a Himalayan ThrustProceedings of the Royal Society of Edinburgh. Section B. Biology, 1954