Some Major Lineaments Reflecting Deep-Seated Fracture Zones in the Central United States, and Mineral Districts Related to the Zones
Heyl, Allen V.
published: Jan 1, 1982
ArtNo. ESP136000201009, Price: 19.00 €
A complex intersecting network of deep-seated structural lineaments worked by faults, folds, clusters of kimberlite plus other alkalic rocks, and large mineral districts are traceable in the craton of the central United States. This structural lineament network is bounded by the Appalachian Fold and thrust belt to the east, the Gulf Coastal Plain and Ouachita Mountains to the south, and the main Rocky Mountain structural front to the west. Major structures of repeated subsidence and uplift are crossed by and lie between the lineaments. Large structures of repeated subsidence are (1) the Mississippi River Embayment with its marginal alkalic plutons, within the wide New Madrid fault system which is parallel to the Embayment. In the center of the complex system is the northeast-trending Reelfoot Rift; (2) the Michigan; (3) Illinois; (4) Appalachian; (5) Forest City; (6) Anadarko; (7) Salina; (8) Arkoma; (9) West Texas; (10) Fort Worth; (11) Arkansas; (12) Denver and (13) Williston basins. Uplifts include the: (1) Frontenac arch; (2) Adirondack uplift; (3) Cincinnati arch; (4) Ozark dome; (5) Wisconsin dome and arch; (6) Nemaha uplift; (7) Wichita uplift; (8) Llano uplift; (9) Matador arch-Red River uplift; (10) central Kansas uplift-Chadron arch; (11) Black Hills uplift; (12) Big Horn uplift; (13) Sioux uplift; (14) Bear Paws and Little Rocky Mountains; and (15) Sweet Grass arch. In addition, there is the oldest and largest structure, the Midcontinent Gravity High with its native copper, iron, and copper-nickel-cobalt deposits. Many types of mineral deposits, such as diamond pipes, bauxite and helium deposits occur within these lineaments, as well as some complex breccias such as the fluorine, thorium, rare earth, beryllium and niobium deposits in the Hicks Dome cryptovolcano. Other deposits as those in the main Mississippi Valley districts, are near the larger lineaments, and they are structurally related to them. Also, perhaps heat and some elements were provided by heated solutions rising from these lineaments. Most of the largest and most important lineaments trend eastward and northward. Connecting them are northeastward and northwestward trending generally smaller lineaments, but at least one major rift valley in the Mississippi River Embayment and its central Reelfoot Rift.