2000 Lakeshore Drive, New Orleans, Louisiana 70148, USA Sarah L. HANSON Geology Department, Adrian College... 110 S. Madison Street, Adrian, Michigan 49221, USA Alexander U. FALSTER and Karen L.WEBBER Department...2000 Lakeshore Drive, New Orleans, Louisiana 70148, USA Abstract Pegmatites enriched in the rare-earth elements...Neoproterozoic occur along a southwestern trend from Wisconsin through Colorado to Arizona. Four widely geographically...districts include the circa 1.5 Ga Wausau syenite complex (WSC), in Wisconsin, the 1.0 Ga South Platte (SP) |