40Ar/39Ar geochronology of mafic rocks from the granite-rhyolite terrane of southeastern Missouri

Masahiko Honda, Paul J. Sylvester, Frank A. Podosek, Klaus J. Schulz

Research output: Contribution to journalArticlepeer-review

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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.

Original languageEnglish
Pages (from-to)301-306
Number of pages6
JournalPrecambrian Research
Volume27
Issue number4
DOIs
StatePublished - Feb 1985

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