40Ar/39Ar geochronology of mafic rocks from the granite—rhyolite terrane of southeastern Missouri |
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| Authors: | Masahiko Honda Paul J Sylvester Frank A Podosek Klaus J Schulz |
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| Institution: | Department of Earth and Planetary Sciences and The McDonnell Center for the Space Sciences, Washington University, St. Louis, MO 63130 U.S.A. |
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| Abstract: | The predominant 1480 Ma granites and rhyolites of the St. Francois Mountains, southeastern Missouri, are intruded by mafic rocks. A 40Ar—39Ar study of some of these, the Skrainka Mafic Group, indicates an age of ～ 1240 Ma, significantly younger than the host rocks, significantly older than Grenville/Keweenawan age, and close to the age of similar rocks in Labrador. |
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