Figure 1. Geographic map of south-central United States. The location of the Prairie Creek lamproite province is shown in relation to selected tectonic features and to the lithospheric transect of Mickus and Keller (1992).
Figure 2. Detailed crustal section beneath the Prairie Creek lamproite province. Section was modified from the lithospheric transect of Mickus and Keller (1992). Model is based on seismic and gravity surveys along the PASSCAL/COCORP transect shown in Figure 1. Calculated rock density in g/cm3 is shown in parenthesis.
Figure 3. Simplified lithospheric transect model (Mickus and Keller, 1992). The approximate location of the Prairie Creek lamproite province is indicated. O/T indicates oceanic transitional crust. Calculated rock density in g/cm3 is shown in parentheses.
Figure 4. Idealized basement geology for the Ouachita aulacogen model. Map is modified from Proterozoic geology of the western midcontinent basement (Van Schmus et al., 1986).
