ACCRETIONARY BASEMENT CONTROL ON STRUCTURE OF CENTRAL USA

A series of accretionary terranes created the southward growth of North America during the Proterozoic. Their sutures, and the intervening boundary zones, established the rejuvenation pattern for Phanerozoic structures. The three series of accretionary terranes and their suture ages (Ga) are: the Southwestern Series consisting of the Mojave (Mv, 1.75), the Yavapai (Yv, 1.70)and the Mazatzal (Mz, 1.65); the Southern Series consisting of the Dawes (Da, 1.78), the Frontier (Ft, 1.71), the Hitchcock (Hi, 1.67) and the Kansas (Ks, 1.61); and the Southeastern Series consisting of the Southern Iowa (SI, 1.76), the Northern Missouri (NM) and the Central Missouri (CM). The intervening Boundary Zones are the Rockies (RBZ), the Nemaha (NBZ) and the Michigan (MBZ) each of which formed a broad north-south suture susceptable to later reactivation structures.