Rb-Sr dating of the Lackner Lake Complex,northern Ontario,Canada |
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Authors: | L.B. Owen G. Faure |
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Affiliation: | Department of Geology and Mineralogy, Ohio State University, Columbus, Ohio 43210 U.S.A. |
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Abstract: | The Lackner Lake Complex of northern Ontario consists of nepheline syenite and ijolite with associated bodies of apatite—magnetite rock and carbonatite. A whole-rock Rb-Sr isochron indicates that these rocks crystallized 1078 ± 7 Ma ago () and had an initial 87Sr/86Sr ratio of 0.070282 ± 0.00011. This date is slightly lower than a K-Ar date of 1090 Ma for biotite reported previously, but is in agreement with K-Ar dates of several nearby syenite-carbonatite complexes. |
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