It is thought that structural controls provided by the Balcones Fault Zone on the west and by the Luling-Mexia-Talco Fault Zone on the east localize the warm waters. The East Texas salt basin is bounded by the Mexia-Talco fault zone in the north and west, the Sabine Uplift in the east, and the Angelina Flexure in the south (fig. Mexia's dramatic proof of what that fault west of town could mean spurred wildcatters to probing oth-er structures on that same fault that angled across the state Geol-ogy texts officially call the fields that resulted "Mexia fault zone" fields, and by 1925. they had pro-duced a total of 204,760,967 barrels of oil. Interspersed among the sandstone are impermeable layers of clay and mudstone. A gross graben structure is commonly developed in the belt of en echelon faults; thus, the zone is an extensional feature. A belt of three major fault zones, the Luling-Mexia-Talco, Arkansas, and Pickens-Gilbertown, generally follows the strike of sediments across the Gulf Coastal Plain and more or less forms . 1). At present six producing oil fields lie along this fault zone--Mexia, Wortham, The Mexia-Powell fault zone is a belt of fracturing that extends from the southern part of Limestone County, Tex., northeast-ward to the eastern border of Navarro County, Tex. These fault systems have produced abundant near The LFZ is the result of post collisional extension along the Fault Salt weld Plio - Pleistocene * Undifferentiated beneath shelf and slope 1. The salt basin extends from the Luling-Mexia-Talco fault zone to the Sigsbee escarpment. Pangea and the rifting of North and South America. The Luling-Mexia-Talco fault zone has worried me and my loved ones for many decades. The blue rectangle shows the study area that is detailed in Figure 2. Shelf-margin extensional (growth) fault zones 4. Mexia- Mt. Location of published heat flow values (blue crosses) and generalized structure map of Texas, showing the position of basement uplifts and intervening basins.Also shown are the Balcones, Mexia and Talco Fault Zones. 32 16. Schematic dip-oriented seismic section along line A from Mexia-Talco fault zone to Mount Sylvan diapir, East Texas Basin. references appendix a. wells used on isopach maps and cross sections. 3 In the East Texas Basin, the Middle Jurassic was marked by the opening of the Compressional anticlines East Texas salt basin 3. This fault zone trends north-south, consists of en echelon horsts and grabens striking about 30/sup 0/ east of the zone's trend, and was active from the Jurassic through the Eocene. Map of study area in East Texas and West Louisiana showing Late Jurassic structural elements and the Haynesville Shale productive area (red striped area). 1. major tectonic elements around the east texas basin. The Elkhart-Mt. The lease area is located along the Mexia-Talco fault zone which is the western margin of the East TX embayment, a negative feature within the Gulf Coast Geosyncline. The dominant feature of the geology of Limestone County is the Mexia Fault Zone. Dome Province, Mexia-Talco Fault Zone, and location of seismic line B (Fig. CENOZOIC. Then the Mexia changes direction and bends abruptly eastward to become the Talco Fault Zone. Mexia - Talco fault zone 2. 15. echelon, normal faults comprising the Balcones, Luling, and Mexia fault zones (Brucks, 1927; Weeks, 1945; Fowler, 1956). Enterprise fault system is part of the Sabine uplift and forms an eastern sealing boundary for the saline aquifer region (Kreitler, 1981). A number of wells in north-central Texas, extending from the Fort Worth basin in the west to the Mexia-Talco fault zones suggest the Ouachita tectonic front represents an important thermal boundary. 2. Transfer downdip of the resultant compressional stress likely boosted diapirism of the La Rue salt, uplifting and faulting the Upper Cretaceous overburden until the strain in the diapir was relieved. The Balcones Fault or Balcones Fault Zone is an area of largely normal faulting in the U.S. state of Texas that runs roughly from the southwest part of the state near Del Rio to the north-central region near Dallas along Interstate 35.The Balcones Fault zone is made up of many smaller features, including normal faults, grabens, and horsts. Mexia Fault Zone. The wells used in this study are located in Palo Duro and Fort Worth Basins, Dallas area, Balcones, Mexia, and Talco Fault zones (red crosses). The Talco continues easterly toward southwestern Arkansas. Balcones and Mexia faults are typically downthrown on the southeast, whereas Luling faults generally have their downthrown sides on the northwest. Mexia-Talco fault zone contains an en echelon array of grabens formed in response to basinward gravity gliding and spreading above the Louann salt. van shallow field. 16) (Modified from Jackson, 1981)..... 24 Figure 16. The embayment is flanked on the east by the Sabine uplift. The aquifer exists within the Mexia-Talco fault zone, one of the defining seismic formations of northern Texas. Enterprise Fault Zones. Isopach thicknesses of the Woodbine range from 375 ft in the west to more than 900 ft in the east (basinward). The Devine Test Site is located in Medina County, approximately 2 miles southwest of Yancey, Texas (Figure 1).The site is located on the northern margin of the Luling Fault Zone (Figures 2 and 3), which is the southern segment of the Luling-Mexia-Talco Fault Zone (LMT) that strikes approximately northeast from the test site area and extends into the northeastern corner of Texas. mexia-talco fault trend. BERG - HUGHES C E N T E R Mexia–Talco Fault Zone • Updip detachment surface of gravity sliding due to the underlying Louann Salts • Fault trend traces the extent of the salt body • Graben structures are conducive to lateral migration of fluids transport pathway. Com-mercial quantities of crude oil are produced from Cretaceous carbonate Data are presented on a series of maps, and interpretations appear in the brief text accompanying the maps. Structural features in Freestone County include the East Texas basin, the Sabine uplift, the Mexia-Talco fault zone, and the East Texas salt province. For Mexia proved to be the bung depositional history . acknowledgments . appendix c. thin section descriptions. REGIONAL STRATIGRAPHY AND SUBSURFACE GEOLOGY OF CENOZOIC DEPOSITS < and . Schematic dip-oriented seismic section along line B from Mexia-Talco fault zone to near Mount Sylvan diapir, East Texas Basin . Paleogene canopies 5. Luling Fault Zone (LFZ) is a parallel continuation of the Miocene aged Balcones- Luling- Mexia -Talco fault system (Walthall and Walper, 1967). I feel for the people of Montgomery County and surrounding areas. The Mexia‐Talco fault zone is one segment of a structural zone that forms the northern rim of the Gulf of Mexico basin. • Monoclines on up-thrown surface (Ambrose et al., 2009) W E Enterprise Fault Zone T alco Fault Zone s a x e T a n i s i u o L Early Sabine arch Sabine Uplift Figure 1. Composition The Nacatoch Aquifer is made up of discontinuous layers of marine sandstone, which grow coarser toward the surface. Along the Mexia Fault Zone, which is approximately parallel to and east of the Balcones Fault Zone, pressure heads are somewhat lower than surrounding heads, suggesting that the Fault Zone is the locus of groundwater discharge from the Hosston/Cotton Valley, and possibly from aquifers beneath the Hosston/Cotton Valley. Schematic interpretation of dip-oriented seismic section along line B from Mexia-Talco fault zone to near Mount Sylvan diapir, East Texas Basin (modified from Jackson, 1981). Neogene canopies and mini-basins 6. To the south, the Mexia is flanked by strong magnetic maxima representing basement high blocks which are offset along trend by northwest-southeast linear features. . One of the obvious features is the Mount Bonnell Fault. The Mexia-Talco Fault Zone borders the eastern and northern portions of East Texas with the Elkhart-Mt. The Big Barn fault formed during the Jurassic but there is evidence that the fault plane has been recently reactivated. This fault zone determined the location of much of the oil and gas discovered within the county prior to deep drilling in the 1970's. • 32 17. Within the past 20 years, extensive deformation and fractures within the vicinity of the fault have formed on … figures. An arcuate trend of high values (220 km/100 km 2) demarcates the Mexia-Talco Fault Zone. This structure was initiated as down-to­ the-basin basement faulting during the opening of the Gulf of Mexico. Other density highs occur near the Angelina Flexure and the South Arkansas and Elkhart-Mt. Mexia-Talco Fault Zone forms the northern and western edges, and the Angeline Flexure defines the southern limit. Enterprise Fault Zone dissecting the study area (Figure 4), associated with the Ouachita tectonic front and the Saltillo-St. Lawrence shear system respectively (Adams, 1990). The Mexia-Talco fault system provides a potential barrier between the saline region of the Woodbine formation and recharge zones in the Woodbine outcrops to the northwest (Oliver, 1971). This extension formed a primary graben, and numerous half-grabens, with the BFZ to the north, and the LFZ to the south (Maclay and Small, 1984). ^ The Woodbine Fault-Line fields stretch along the Mexia Fault Zone, which runs through Milam, Falls, Limestone, Freestone, Navarro, Henderson, and Kaufman counties in east central Texas ^ 1920 United States Federal Census Name: Lee W Tomar [Lee W Tomer] Home in 1920: Justice Precinct 4, Limestone, Texas Age: 46 years ^ THOMAS v. The Mexia-Talco Fault Zone generally delineates the subsurface limit of the aquifer. appendix b. electric log patierns and descriptions of sidewall cores and well cuttings . The groundwater in the aquifer is typically alkaline, high in sodium bicarbonate, and soft. 1). It also determined the distribution of surface geological formations and the soils that formed from them. Figure 1: Regional and structural setting of the East Texas Basin (Montgomery et al., 1999). 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