Rb-Sr isochron age of the Manicouagan Melt Sheet, Quebec, Canada
| Autor: | Bor-ming Jahn, C. H. Simonds, R. J. Floran |
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| Rok vydání: | 1978 |
| Předmět: |
Isochron
Atmospheric Science Mineral Ecology Meteorite craters Geochemistry Paleontology Soil Science Forestry Aquatic Science Oceanography Isotopes of strontium Geophysics Space and Planetary Science Geochemistry and Petrology Earth and Planetary Sciences (miscellaneous) Geology Earth-Surface Processes Water Science and Technology |
| Zdroj: | Journal of Geophysical Research. 83:2799 |
| ISSN: | 0148-0227 |
| DOI: | 10.1029/jb083ib06p02799 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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