Product Code Database
The Spavinaw terrane is an occurrence of Proterozoic (1.40–1.35 Ga)Age of 1370 ±20 Ma for samples from Spavinaw Creek outcrop in: Bickford, M. E. and Richard D. Lewis, U-Pb geochronology of exposed basement rocks in Oklahoma, Geological Society of America Bulletin, 1979;90;540-544 Intrusive rock and volcanic rocks in the mid-continent region of the United States. The terrane extends across southern Missouri, southern Kansas, northern Arkansas and much of Oklahoma. The rocks are almost entirely known from drill core and only exposed in outcrop near Spavinaw, Mayes County, Oklahoma and parts of the Saint Francois Mountains in Washington County, Missouri. The terrane is composed almost exclusively of essentially unaltered intrusive and volcanic rhyolite and rhyolite .Sims, P.K., Kisvarsanyi, E.B., and Morey, G.B., 1987, Geology and metallogeny of Archean and Proterozoic basement terranes in the northern Midcontinent, U.S.A. U.S. Geological Survey Bulletin, 1815
The terrane is 100 m.y. younger than the Saint Francois terrane of southeast Missouri, but older than tholeiitic basalts and rhyolites of Middle Proterozoic Midcontinent Rift System.
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