versão On-line ISSN 1405-3322
Bol. Soc. Geol. Mex vol.63 no.2 México ago. 2011
New constraints on timing of Hidalgoan (Laramide) deformation in the Parras and La Popa basins, NE Mexico
Nuevas limitantes en la temporalidad de la deformación Hidalgoana (Laramídica) en las cuencas de Parras y La Popa, NE México
Gary G. Gray1,* y Timothy F. Lawton2
1 ExxonMobil Upstream Research Company, Houston, Texas 77027, USA.*email@example.com.
2 New Mexico State University, Las Cruces, New Mexico 88003, USA.
Manuscript received: July 9, 2009.
Corrected manuscript received: May 12, 2010.
Manuscript accepted: June 11, 2010.
The Parras and La Popa basins of northeastern Mexico together contain at least three separate types of structures that were active during Maastrichtian through Early Eocene time. These structures include salt diapirs and salt welds, EW trending anticlines detached within the Campanian Parras shale, and large NWSE trending anticlines detached within the Jurassic salt layers. The oldest halokinetic structure, the La Popa salt weld, began to form by Late Aptian time. This structure is parallel to the later NWSE contractional folds, but it predates regional contraction. The earliest dated contractional structures in the Sierra Madre Oriental are EW trending folds and faults found east of the La Popa syncline. These structures were active only briefly during the deposition of the lower Maastrichtian Muerto Formation. Very similar eastwest structures in the northern Parras Basin contain growth strata of upper Maastrichtian and Paleocene age. Folding of upper Paleocene beds indicates that this shortening continued into the Eocene. Very Large amplitude NWSE trending anticlines in La Popa Basin also formed due to regional contraction, and they clearly refold the shallowdetached EW set. Regional evidence suggests that all contractional deformation ceased around 40 Ma. Salt withdrawal may have continued after the cessation of contractional deformation. The contractional deformation in these basins is similar in structural style to the Sevier orogen in the U. S. A., but it is later and of shorter duration than the Sevier orogeny; it is timeequivalent to the Laramide orogeny, but it differs significantly from the Laramide structural style. Thus, the Mexican orogenic system differs from the U. S. A. orogens. This uniqueness was recognized by Guzmán and De Cserna (1963) who named this deformational event in Mexico the Hidalgoan orogeny.
Keywords: Laramide orogeny, Hidalgoan orogeny, Mexico, La Popa Basin, Parras Basin, Sierra Madre Oriental.
En las Cuencas de Parras y La Popa del noreste del México, contienen al menos tres estilos de estructuras distintas que estuvieron activas durante el Maastrichtiano hasta el Ecoeno temprano.. Estas estructuras incluyen diapiros de sal, soldaduras de sal, anticlinales orientados EW, despegados en la lutita Parras del Campaniano, y grandes anticlinales orientados noroestesureste despegados en capas de sal del Jurásico. La estructura halocinética mas antigua, la soldadura de La Popa, inició su formación en el Aptiano tardío. Dicha estructura es paralela a pliegues de contracción NWSE posteriores, pero precede a la contracción regional. Las estructuras de contracción más temprana fechadas en la Sierra Madre Oriental son pliegues y fallas de orientación EsteOeste ubicados al oriente del sinclinal de La Popa. Estas estructuras estuvieron activas sólo brevemente durante la deposición de la Formación El Muerto del Maastrichtiano inferior. Estructuras muy similares EW al norte de la Cuenca de Parras contienen estratos de crecimiento del Maastrichtiano superior y del Paleoceno. El plegamiento de las capas del Paleoceno superior indica que el acortamiento continuó en el Eoceno. Anticlinales de gran amplitud, orientados NWSE en la Cuenca de La Popa se formaron también por la contracción regional y claramente repliegan las estructuras de desprendimiento someros orientadas EW. La evidencia regional sugiere que la deformación contraccional terminó hace alrededor de 40 Ma. La evacuación de la sal pudo haber continuado después del cese de la deformación contraccional. La deformación por contracción en estas cuencas es similar en estilo estructural a la orogenia Sevier en los E. U. A., pero es de ocurrencia posterior y de menor duración; es equivalente en tiempo a la orogenia Laramide, pero difiere significativamente de su estilo estructural. Por lo tanto, el sistema orogénico mexicano es diferente al de los E. U. A. Esta particularidad fue reconocida por Guzmán y De Cserna (1963), quienes nombraron este episodio deformacional la orogenia Hidalgoana en México.
Palabras Clave: Orogenia Laramide, orogenia Hidalgoana, Cuenca de La Popa, Cuenca de Parras, Sierra Madre Oriental.
The greater Sierra Madre Oriental and adjacent Coahuila foldbelt of NE Mexico comprise one of the most spectacular fold provinces on Earth (Figure 1). This mountain belt is an extension of the SevierLaramide orogenic system into Mexico (De Cserna, 1956; ArandaGarcía, 1991). A thick succession of Upper Jurassic through lower Eocene strata (Figure 2) is fully involved in the deformation (De Cserna, 1971; Eguiluz de Antuñano, 2001; Gray et al., 2001), indicating a minimum early Cenozoic age for the contractional deformation. This timing is coeval with the latter part of the Laramide and Sevier events in the western United States (Craddock et al., 1988, Kulik and Schmidt 1988; Lawton and Trexler, 1991; Lawton et al., 1993). The style of deformation in the Mexican cordillera is predominantly thinskinned, similar to the Sevier orogen in the U. S. A. (e.g., De Cserna, 1956; Armstrong, 1968; Padilla y Sánchez, 1985).
The timing of this orogenic event has been previously inferred from unconformities in adjacent basins (Prost et al., 1994; Prost and Aranda, 2001; Eguiluz de Antuñano, 2001) and from interpretations of synkinematic and postkinematic plutons in the Sabinas Basin (ChávezCabello, 2005). Although the onset of folding has not been previously constrained, these analyses place the end of contractional deformation in the late Eocene (4138 Ma). Gray et al. (2001) attempted to date cooling related to the onset of this orogeny via apatite fission track analysis, but all apatites they examined were thermally reset in the midTertiary. Gray et al. (2001) did obtain a 62 Ma K/Ar age on fault gouge from a Hidalgoan thrust near Xilitla, San Luis Potosí, that was interpreted as the last stage of movement on this structure.
Contractional deformation created two distinct fold trends in the region (Figure 3; e.g., Soegaard et al., 2003). Very large northwestsoutheast folds are parallel to the overall trend of the orogen and are detached within the underlying Middle Jurassic evaporites. Smaller eastwest folds are detached within the Upper Cretaceous Parras shale. These two sets of structures are superimposed in the La Popa Basin. The primary purpose of this paper is to document this overprinting relationship and to present detailed evidence for the timing of the two sets of structures. In particular, we review evidence for the onset of contractional deformation in the early Maastrichtian.
2. Salt vs. 'Tectonic' structures
The southern end of the Sabinas Basin encompasses a region of structures arising from the movement of underlying salt layers (Figure 3; Lawton et al., 2001; Rowan et al., 2003). Part of this region also has a significant accumulation of Cenozoic strata. The area with significant Cenozoic deposits is referred to as La Popa Basin (McBride et al., 1974; Laudon, 1984; VegaVera et al., 1989; Lawton et al., 2001). La Popa Basin is unique in the region in that it contains the only welldocumented examples of salt diapirs and vertical salt welds in northern Mexico (Lawton et al., 2001). La Popa and the southern Sabinas Basin contain very large, northwesttrending folds. These folds have average lengths of > 60 km, widths of 8 km, and amplitudes in excess of 1 km. The folds are detached within the Jurassic Minas Viejas Formation. They trend parallel to analogous detachment folds in Lower Cretaceous carbonate strata that occupy the Coahuila folded province (Eguiluz de Antuñano, 2001; ChávezCabello, 2005).
Relatively thick Cenozoic strata are also present in the Parras Basin, although no salt structures are present (Figure 3; McBride et al., 1974; Ye et al., 1997; Soegaard et al., 2003). These rocks are folded into EW trending, northverging anticlines with larger amplitudes in the south that decrease to the north. Well exposed folds along the plunging eastern margin of the Coahuila uplift indicate that these structures are detached within the Campanian Parras Shale (Figure 5; Couch, 2005). In the Parras Basin, where no salt is known to exist, all of the structures are tectonic in origin and have northward vergence (Weidie and Murray, 1967; Dillman, 1985). In contrast, the salt diapirs and salt weld structures of the La Popa Basin are halokinetic in origin (Giles and Lawton, 1999, 2002; Rowan et al., 2003). To the north, in the Coahuila folded belt, northwesttrending saltcored anticlines are clearly part of the regional, northeastdirected contractional deformation (Eguiluz de Antuñano, 2001). The northwesttrending folds in La Popa and Sabinas basins are interpreted to be detached on salt, and to be cored by salt. Although the role of contractional tectonics in forming the large northwesttrending folds in La Popa Basin is not clear, the similarity of fold trends in the La Popa and Sabinas basins suggests that the La Popa folds are largely the result of regional shortening.
3. Evidence for the timing of salt structures
The onset of salt movement in La Popa Basin is primarily determined from growth relationships adjacent to the salt bodies. The most obvious growth strata are localized shoaling carbonate bodies, named lentils by McBride et al. (1974). These lentils are generally composed of bioclastic limestone near the salt bodies, and become more carbonate mudrich as they thin away from the salt. They are interpreted to represent deposition on localized bathymetric highs related to the upward movement of salt (Giles and Lawton, 2002; Rowan et al., 2003). The oldest recognized lentil is Aptian (Lawton et al., 2001) adjacent to the La Popa salt weld. The lentils range from Aptian to early Eocene, with an apparent increase in number (as currently exposed in the basin) in the upper Maastrichtian through Paleocene section.
The large northwestsoutheast trending folds that characterize La Popa Basin, in particular the El Gordo anticline, appear to be younger than the onset of diapirism, although they too are interpreted to be cored by salt (Lawton et al., 2001; Rowan et al., 2003). Weislogel (2001) demonstrated that the Maastrichtian Muerto Formation thins in proximity to the El Gordo diapir, yet maintains constant thickness across the adjacent northwesttrending El Gordo anticline, indicating that the diapir predates and the anticline postdates deposition of the Muerto Formation. Hon (2001) demonstrated that the Muerto Formation onlaps the margin of the La Popa weld, but does not thicken into the adjacent northwesttrending La Popa syncline likewise indicating postMuerto Formation onset of shortening (Figure 5). Druke (2005) documented growth geometries within the La Popa syncline in strata of the upper Maastrichtian Potrerillos Formation (Figure 6). Thus, the La Popa salt weld, with lentils as old as Aptian, is the oldest documented salt structure in the basin. The El Gordo diapir is also an early structure (Weislogel, 2001). The oldest salt rise associated with the El Papalote diapir can only be dated as late Maastrichtian due to lack of exposure of older units. On the basis of the data described above, the earliest reliable age for the northwestsoutheast folding away from the La Popa weld is late Maastrichtian.
Evidence for the end of salt deformation in La Popa Basin varies depending upon the particular salt structure in question. Local thinning relationships demonstrate that the El Papalote diapir continued to rise during deposition of the Paleocene upper sandstone member of the Potrerillos Formation (Shelley and Lawton, 2005), but ceased to move during deposition of the lower Eocene Adjuntas Formation (Gray, unpublished data). Lower Eocene Viento beds are folded by the El Gordo diapir, so salt movement there continued later into the early Eocene, but that is the end of the sedimentary record. The youngest unit preserved in the basin is the early Eocene Carroza Formation (VegaVera et al., 1989), which is only present in a minibasin directly southwest of the La Popa weld. There are no preserved early Eocene beds on the north side of the weld, but projection of the top Paleocene surface onto the weld, from both sides, indicates an offset of at least 1 km. This postearly Eocene displacement is approximately 30 % of the total slip along this weld and suggests that salt movement along the La Popa weld continued well into the Tertiary.
4. Evidence for timing of contractional structures
The first indication of orogeny in the ParrasLa Popa basin area is recorded by a marked shift from carbonate to clastic deposition at the beginning of Campanian time. Marls of the Santonian Indidura Formation and the Campanian Parras Shale are both deep marine deposits, but the striking change in mineralogy at the beginning of the Campanian suggests that uplift and erosion had begun in the west (Gray et al., 2001; Gray and Lawton, 2008). Thick Campanian shales are prominent features of the Cretaceous Western Interior Seaway of the central U. S. A.; however, the transition to Campanian shale is more marked in NE Mexico due to the abrupt termination of carbonate deposition. The initial appearance of carbonate rock fragments in Parras Basin strata occurs in the upper Campanian Cañon del Tule Formation (Baker, 1970). These recycled carbonate lithic grains were derived from an uplifted hinterland that exposed Lower Cretaceous carbonates to the west (e.g., Lawton et al., 2009).
The oldest direct evidence for the onset of tectonic shortening is folding and faulting of the Muerto Formation in the La Popa Basin, east of La Popa syncline (Figure 7). These structures are eastwest trending and have an overall appearance very similar to the EW trending structures in the Parras Basin. These structures are detached within the Campanian Parras Shale, although the detachment depth is not the same in all structures (Figure 7; Couch et al., 2004; Couch, 2005). Near La Popa syncline, these structures deform the lower Muerto Formation, but the uppermost Muerto Formation sands onlap the folds (Figure 8). These onlapping upper Muerto Formation beds in turn are slightly folded. The lower Potrerillos Formation overlaps these structures without evidence of EW folding. These contractional structures are therefore early Maastrichtian in age. In the northern Parras Basin, Couch (2005) documented syntectonic growth on two eastwesttrending folds, which she named the Los Tulillos fold complex. The main period of growth on the Los Tulillos structures occurred during deposition of the upper Maastrichtian Las Encinas Formation. Couch (2005) also demonstrated that fold growth appears to be younger to the south.
The EW trending folds in the Parras Basin involve the entire stratigraphic section above the Parras Shale (Figure 2). Even the upper Paleocene growth strata in the Los Tulillos folds have been folded, indicating that contractional deformation in the Parras Basin continued into the Eocene. In the eastern La Popa Basin, all of the EW trending contractional structures appear to be early Maastrichtian. The EW structures in western La Popa Basin have not been dated, although it appears that they involve only the lower Potrerillos Formation and hence could be slightly younger than the eastern structures. These relationships suggest a probable latest Cretaceous in age (Figure 3).
Eguiluz de Antuñano (2001) interpreted the end of folding in the Coahuila folded province at 39.5 Ma, based upon an angular unconformity in the adjacent Burgos Basin. ChavezCabello (2005) also placed an upper age limit on contractional deformation in the Coahuila folded belt using evidence from the late Eocene MonclovaCandela intrusive suite. He interpreted the 44 Ma Mercado intrusive as a syntectonic pluton based upon a pronounced foliation within the body, while the slightly younger 4239 Ma intrusives appear to be entirely posttectonic. There are no preserved overlapping strata of late Eocene age or younger, so these textural data are the best extant constraints regarding the end of contractional deformation in the region.
5. Relationship between halokinetic and contractional structures
The oldest of structures in the Parras, La Popa, and southern Sabinas basins are related to the vertical movement of salt. These structures began to move by Aptian time, and appear to have formed as a result of sediment loading alone while the surrounding region was a very large carbonate platform (Goldhammer, 1999; Lehmann et al., 1999). The diapiric structures in La Popa Basin do not appear to have a preferred orientation. The large salt weld along the northeast side of the basin, however, parallels the later contractional structures. The carbonates deposited in this platform are regionally quite uniform in thickness, indicating that regional tectonic deformation had not begun. Salt withdrawal continued into Eocene and possibly into Oligocene time (Gray et al., 2001). Eastwest trending contractional structures in eastern La Popa Basin were the next structures to form. These structures formed during a brief time of shortening in the early Maastrichtian.
Between late Maastrichtian and early Eocene time, both EW and NWSE trending structures were active, but the EW folds were limited to the Parras Basin area, and the northwesttrending folds were active in the La Popa and southern Sabinas basins (Figure 2). We speculate that folding of the early Maastrichtian décollements in La Popa Basin by salt movement, as documented at La Popa syncline (Druke, 2005) and La Gavia anticline (Couch et al., 2004; Couch, 2005), may have prevented further development of detached structures within the Parras Shale, and limited subsequent deformation on EW trending folds to the Parras Basin.
6. Comparison of timing between NE Mexico and SevierLaramide province
As noted earlier, the NWSE and EW trending folding in northeast Mexico was coeval in part with the late stages of both the Sevier and Laramide orogenies in the western U. S. A. The Late CretaceousPaleogene timing of deformation in Mexico is typically referred to as "Laramide" by most authors. We take exception to the usage of the term Laramide for several reasons. First and foremost is the implication that Laramide structures are characterized by the basementinvolved style present at the 'type' Laramide in southern Wyoming. Secondly, despite abundant references citing the Laramide orogeny as occurring over a very similar time period as deformation in northeast Mexico (e.g. Dickinson et al., 1988), a growing number of studies demonstrate that this distinctive structural style began earlier in the Cretaceous within the classic Laramide province than previously thought (DeCelles, 1986; Craddock et al., 1988; Barth et al., 2004; JacquesAyala et al., 2009). "Laramidetime" and "Seviertime" are therefore essentially synonymous (Figure 9).
An obvious alternative would be to compare the Sierra Madre Oriental and Sabinas structures to the Sevier orogen. They are similar in style, especially in the areas where the Mexican foldbelts are strongly faulted. The late stages of the Sevier orogeny also overlap completely in time with the Mexican orogen (Craddock et al., 1988; Lawton and Trexler, 1991; Lawton et al., 1993) but the Sevier thrusting began in the Early Cretaceous, whereas the Sierra Madre Oriental and Sabinas structures were demonstrably not active until the latest Cretaceous. Although there are many similarities with the type Sevier and Laramide systems to the north, we think the differences in structural history within Mexico are significant enough to warrant retaining the term Hidalgoan orogeny as originally proposed by Guzmán and De Cserna (1963) by virtue of younger age and contrasting, salt and shaledetached style of deformation in the northeastern Mexican cordillera. It is only by recognizing the kinematic and temporal differences between these areas that we will understand important variations in crustal type, crustal structure, stratigraphy, and plate interactions that drove these deformational events all along the margin of North America.
The authors would like to thank NMSU students Rachel Couch, Dominic Druke, Kevin Hon, David Shelley and Amy Weislogel, whose MS work was critical to this summary. The authors have benefited from discussions with many other colleagues regarding the geology of NE Mexico, in particular Samuel Eguiluz, Kate Giles, Bob Goldhammer, Rolando Peterson and James Wilson. Mark Rowan, Dante Morán and Gabriel Chávez Cabello are thanked for their thoughtful reviews. ExxonMobil Upstream Research Company is thanked for supporting many years of fieldwork and analyses and for permission to publish this work.
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