The study of Precambrian rocks in the midcontinent region (Figure 1) of North America is crucial in understanding the Proterozoic evolution of the North American continental lithosphere. Due to the limited exposures of the Precambrian crystalline rocks in the midcontinent region, most studies have used cores and drill cuttings to study the Precambrian geology in this region. In Oklahoma, the Precambrian basement is covered by Phanerozoic sediments except for a small area in Spavinaw, OK in the northeast and in the eastern Arbuckle mountains in the southeast. Some of the early petrological and geochronological studies of the Precambrian basement rocks laid the groundwork for investigating the continental evolution in the midcontinent region (
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