Rb-Sr isochron age of the Manicouagan melt sheet, Quebec, Canada

Details Rb-Sr isochron age of the Manicouagan melt sheet, Quebec, Canada Rb-Sr isochron age of the Manicouagan melt sheet, Quebec, Canada

Jun 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.2799j&link_type=abstract

Journal of Geophysical Research, vol. 83, June 10, 1978, p. 2799-2803.

Physics

12

Isotope Effect, Meteorite Craters, Meteoritic Damage, Rubidium, Strontium Isotopes, Abundance, Canada, Minerals

Scientific paper

Rb-Sr isotopic data for mineral separates from a rock of the Manicouagan impact melt sheet define an isochron of age T = 214 + or - 5 (2 sigma) m.y. which agrees with the K-Ar age of 210 + or - 8 (2 sigma) calculated by Wolfe (1971). The initial Sr-87/Sr-86 ratio I is found to be 0.70991 + or - 0.00007 (2 sigma); four whole rock samples yield age-corrected I values ranging from 0.70965 to 0.71006. These high I values support the hypothesis that the melt sheet was derived by total melting of Grenville basement rocks during the impact event 214 m.y. ago.

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