Thermal uplift occurred when the Bermuda hotspot was under the Mississippi River Valley, which brought on the rejuvenation of the Reelfoot rift basement faults and pluton intrusion. The Late-Cretaceous uplift led to the development of the Late Cretaceous unconformity. Subsequently, Late Cretaceous thermal subsidence occurred when the CMRV moved off the hotspot, ensuing in the inundation of the landscape by the Gulf of Mexico to type the Mississippi embayment.
Paleozoic rocks overlying the Reelfoot rift consist of the Lower to Upper Cambrian Potsdam Megagroup and are divided into the basal Lamotte sandstone, ascending to the Bonneterre dolomite, and the Elvin shale (Figure 4; Howe and Thompson, 1984; McKeown et al., 1990). Upper Cambrian to Lower Ordovician strata of the undifferentiated Knox Megagroup instantly overlie the Potsdam Megagroup (Howe and Thompson, 1984; Howe, 1985; McKeown et al., 1990; Nelson and Zhang, 1991; Lumsden and Caudle, 2001). The Paleozoic Era concluded in the area with the formation of the Appalachian-Ouachita orogenic belt . The Appalachian-Ouachita mountain belt was erosionally breached during the Middle Cretaceous when the North American plate drifted over the Bermuda hotspot (Cox and Van Arsdale, 1997, 2002; Van Arsdale and Cox, 2007).
In addition, there are two previously unidentified faults in southern Lake County that displace the tops of the Paleozoic and Cretaceous . The AF isn’t obvious in Figure 9A although the Cretaceous thickens at this location but is obvious in Figure 9B with up-to-the-west displacement on the tops of the Paleozoic and the Cretaceous. The Cottonwood Grove and Ridgely faults are evident as the west-bounding and east-bounding faults, respectively, of the Ridgely ridge horst at depth. The CGF has up-to-the-east displacement on the tops of the Paleozoic and the Cretaceous but does not appear to point out displacement on the highest of the Eocene.
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Red and blue dashed strains characterize Guo et al. and Odum et al. interpreted areas of the NMF, respectively. Brown dashed lines represent beforehand interpreted faults. T, Tiptonville; R, Ridgely; RL, Reelfoot Lake; AF, Axial; CGF, Cottonwood Grove; RF, Ridgely; RNF, Reelfoot North; RSF, Reelfoot South; TDB, Tiptonville dome back thrust; LCUB, Lake County uplift back thrust faults; KY, Kentucky; MO, Missouri; TN, Tennessee.
It can be high on both the Tiptonville dome and Ridgely ridge and low beneath Reelfoot Lake basin. The prime of the Paleozoic has the same highs and lows because the Cretaceous, however the prime of the Paleozoic is highest beneath Ridgely ridge . Elevations of stratigraphic tops from seismic reflection surveys have been included from publications by Purser and Van Arsdale , Van Arsdale et al. , Csontos and Van Arsdale , Guo et al. , and Greenwood et al. . When elevations of stratigraphic tops in a seismic reflection line were not in a publication, conversions from two-way travel instances were performed utilizing revealed interval velocities .
The Mississippi River point bar sequence sands and underlying channel sandy gravels are positioned from 25 ft (7.6 m) to a maximum depth of about 250 ft (76.2 m) . Reelfoot Lake is assumed to be approximately 5 ft (1.5 m) deep over many of the lake, and so the lake water is just shown on the surface and the first 5 ft (1.5 m) depth interval . On December sixteen, 1811 the ∼M 7.5 earthquake occurred on the northeast-striking, dextral strike-slip axial fault close to the city of Blytheville, Arkansas (Figure 1; Johnston and Schweig, 1996).
Guo et al. additionally suggest that the NMF is parallel to the Reelfoot scarp and that it displaces models from the Paleozoic to the Paleogene and possibly into the Quaternary. The geologic cross-sections (Figures 8–10) and the Lake County fault map are of explicit value to the residents of Lake County. These figures illustrate where faulting may produce floor rupture and what sense of displacement is expected kinderhook bank login if a big earthquake had been to occur inside the county. Cross-sections have been made from stacked structure contour maps in ArcMap. This software creates cross-sections based mostly on manually entered parameters such because the search distance of borings from a cross-section line and vertical exaggeration.
Greenwood et al. argue that the RSF is not offset by the CGF or RF. Displaced Quaternary stream terraces and displacement of the Upland Complex within the Mississippi River bluffs just to the east of Lake County in Obion County signify that the RSF and Tiptonville dome proceed southeast into Obion County (Greenwood et al., 2016). Lake County, Tennessee with places of Cross-Sections A-A’, B-B’, and C-C’.
