Year of Publication
Doctor of Philosophy (PhD)
Arts and Sciences
Earth and Environmental Sciences (Geology)
Dr. William A. Thomas
As indicated by drilling and geophysical data, the Mississippi Valley Graben, the Rough Creek Graben, together with the Rome Trough of eastern Kentucky and West Virginia, are fault-bounded graben structures filled with as much as 27,000 feet of Early to Middle Cambrian sediments. Detailed regional mapping of Cambrian and younger strata within and surrounding these structures indicates that they formed contemporaneously. The proximity of these structures suggests they developed within the same regional stress fields and tectonic environments. These three structures are mechanically and kinematically connected, and formed part of a single continent-scale rift system produced during the breakup of Rodinia and the separation of Laurentia from Amazonia.
Data including stratigraphic tops from 1,764 wells, interpretations of 106 seismic profiles, aeromagnetic and gravity survey analysis, and mapped surface geology and structures were used within this project. Seven stratigraphic packages resolvable in both geophysical well logs and reflection seismic profiles were mapped in the subsurface across parts of Kentucky, Ohio, Indiana, Illinois, Missouri, and Tennessee. These stratigraphic units were then analyzed through structure maps, isopachous maps, and across 12 regional well-based cross sections.
Detailed analysis of thickness patterns of seven major stratigraphic packages was used to identify the locations and timing of major fault movements within the study area. The regional patterns of fault movements through time were used to investigate how the structures evolved in response to the tectonic episodes in southeastern Laurentia during the Cambrian through Devonian Periods.
Active rifting of the Precambrian crystalline bedrock began by the Early Cambrian, and resulted in a thick deposit of Reelfoot Arkose and Eau Claire Formation within the Mississippi Valley and Rough Creek Grabens, and the Rome Formation and Conasauga Group within the Rome Trough. Major tectonic extension ended by the Late Cambrian, prior to the deposition of the Knox Supergroup. Counter-clockwise rotation of the regional sigma-1 stress field between the Middle Ordovician and Early Mississippian (Taconic through Acadian Orogenies) resulted in the reactivation of varying sets of preexisting faults through time. The locations, orientations, and timing of these active faults relate to the deep architecture of the rift system.
Hickman, John Bibb Jr., "STRUCTURAL EVOLUTION OF AN INTRACRATONIC RIFT SYSTEM; MISSISSIPPI VALLEY GRABEN, ROUGH CREEK GRABEN, AND ROME TROUGH OF KENTUCKY, USA" (2011). University of Kentucky Doctoral Dissertations. 144.
Plate_02_Unit_G.pdf (1668 kB)
Plate_03_Isopach_G.pdf (1399 kB)
Plate_04_Unit_F.pdf (2631 kB)
Plate_05_Isopach_F.pdf (1253 kB)
Plate_06_Unit_E.pdf (1888 kB)
Plate_07_Isopach_E.pdf (1239 kB)
Plate_08_Unit_D.pdf (1997 kB)
Plate_09_Isopach_D.pdf (1269 kB)
Plate_10_Unit_C.pdf (5556 kB)
Plate_11_Isopach_C.pdf (3762 kB)
Plate_12_Unit_B.pdf (4001 kB)
Plate_13_Isopach_B.pdf (2631 kB)
Plate_14_Unit_A.pdf (1235 kB)
Plate_15_Isopach_A.pdf (1254 kB)
Plate_16_Top_of_PCMB.pdf (2712 kB)
Plate_17_Aeromag_RTP.pdf (2765 kB)
Plate_18_Aeromag_2VD.pdf (2985 kB)
Plate_19_Bouguer_Gravity.pdf (1240 kB)
Plate_20_RCG_D1.pdf (1158 kB)
Plate_21_RCG_D2.pdf (1107 kB)
Plate_22_RCG_D3.pdf (1170 kB)
Plate_23_RCG_D4.pdf (1131 kB)
Plate_24_RCG_D5.pdf (1037 kB)
Plate_25_MVG_DA.pdf (1074 kB)
Plate_26_MVG_DB.pdf (2329 kB)
Plate_27_MVG_DC.pdf (4626 kB)
Plate_28_Strike_1.pdf (1226 kB)
Plate_29_Strike_2N_and2S.pdf (1049 kB)
Plate_30_Strike_3.pdf (1265 kB)
Plate_31_Strike_4.pdf (1124 kB)