Preliminary geologic map of the Aztec 1° x 2° quadrangle, northwestern New Mexico and southern Colorado

Manley, Kim; Scott, G.R.; Wobus, R.A.

doi:10.3133/ofr78466

Cited by 5 publications

(11 citation statements)

References 1 publication

(1 reference statement)

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“…On gravity maps (Aiken, 1975;Suits and Cordell, 1981), L7 lies along a northeast-trending gravity gradient marking the southeastern flank of a broad, northeast-trending gravity high extending from northeastern Arizona to the San Juan volcanic field in southwestern Colorado. This boundary also corresponds to a northeast-trending belt of magnetic anomalies in Arizona (Sauck and Sumner, 1970) that extends from the southwestern end of L7 southwestward through the There are no folds or faults mapped in the vicinity of L8 (Manley and Scott, 1978) with which to make comparisons of structural orientations. But L8 does mark the axis of a northeast-trending prong of high gravity that protrudes northeastward across the center of the San Juan Basin (Suits and Cordell, 1981) suggesting that there may be a northeast-trending feature in the Precambrian basement that has influenced the development of northeast-trending linear features in the Tertiary sediments.…”

Section: Domain Boundary Lineamentmentioning

confidence: 99%

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Lineaments derived from analysis of linear features mapped from Landsat images of the Four Corners region of the Southwestern United States

Knepper¹

1982

Open-File Report

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Linear features are relatively short, distinct, non-cultural linear elements mappable on Landsat multispectral scanner images (MSS). Most linear features are related to local topographic features, such as cliffs, slope breaks, narrow ridges, and stream valley segments that are interpreted as reflecting directed aspects of local geologic structure including faults, zones of fracturing (joints), and the strike of tilted beds. 6,050 linear features were mapped on computer-enhanced Landsat MSS images of 11 Landsat scenes covering an area from the Rio Grande rift zone on the east to the Grand Canyon on the west and from the San Juan Mountains, Colorado, on the north to the Mogollon Rim on the south. Computer-aided statistical analysis of the linear feature data revealed 5 statistically important trend intervals: 1.) N.10W.-N.16E., 2.) N.35-72E., 3.) N.33-59W., 4.) N.74-83W., and 5.) N.89-9-W. and N.89-90E. Subsequent analysis of the distribution of the linear features indicated that only the first three trend intervals are of regional geologic significance. Computer-generated maps of the linear features in each important trend interval were prepared, as well as contour maps showing the relative concentrations of linear features in each trend interval. These maps were then analyzed for patterns suggestive of possible regional tectonic lines. 20 possible tectonic lines, or lineaments, were interpreted from the maps. One lineament is defined by an obvious change in overall linear feature concentrations along a northwest-trending line cutting across northeastern Arizona. Linear features are abundant northeast of the line and relatively scarce to the southwest. The remaining 19 lineaments represent the axes of clusters of parallel linear features elongated in the direction of the linear feature trends. Most of these lineaments mark previously known structural zones controlled by linear features in the Precambrian basement or show newly recognized relationships to geological and/or geophysical patterns that suggest probable influence by buried basement features. The remaining few lineaments are not strongly correlative with geological or geophysical patterns, but on the basis of existing data they cannot be dismissed as being possible expressions of basement features. NO. OF DATA = 27044

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Section: Domain Boundary Lineamentmentioning

confidence: 99%

“…Structurally, the southeast end of LI5 marks the tectonic boundary between the Rio Puerco fault zone on the north and the Lucero uplift on the -south (Kelley and Clinton, 1960;Callender and Zilinski, 1976, p. 53, Fig. 1 (Manley and Scott, 1978).…”

Section: Domain Boundary Lineamentmentioning

confidence: 99%

Lineaments derived from analysis of linear features mapped from Landsat images of the Four Corners region of the Southwestern United States

Knepper¹

1982

Open-File Report

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“…Northwest-trending lineaments associated with faults, including the Tusas and Vallecitos fault zones, in the Tusas Mountains are apparent from previous geologic mapping (e.g., Aby, 2008;Aby et al, 2010;Barker, 1958;Butler, 1946;Koning et al, 2007;Manley et al, 1987) and aeromagnetic data (Drenth et al, 2011(Drenth et al, , 2019 (Figure S5 in Supporting Information S1; Data Set S2; Thompson Jobe & Chupik, 2021). These NW-trending faults have clear geomorphic expression across the landscape, and commonly exhibit down-to-the-southwest vertical separation of Mesozoic, Miocene, and even Pliocene strata (Drenth et al, 2011).…”

Section: Nw-trending Lineaments and Faults In The Tusas Mountainsmentioning

confidence: 88%

“…Previous work by Manley et al. (1987) did not map Quaternary displacements across the Gallina fault, but field observations from Derouin and Su (2013) document subtle evidence of Quaternary deposits displaced along small (1–2 m high), discontinuous scarps. Based on field reconnaissance by Derouin and Su (2013), the fault was characterized as either an older Quaternary fault (early to mid‐Pleistocene) and/or a very slow‐moving fault.…”

Section: Geologic Settingmentioning

confidence: 98%

“…In the area near El Vado Reservoir, the fault splays into closely spaced, stepping, and distributed faults (Figure 3) with small vertical separation across all faults (∼10-50 m) that terminate into the southern end of the AA (Landis & Dane, 1968). Manley et al (1987) did not map Quaternary displacements across the Gallina fault, but field observations from Derouin and Su (2013) document subtle evidence of Quaternary deposits displaced along small (1-2 m high), discontinuous scarps. Based on field reconnaissance by Derouin and Su (2013), the fault was characterized as either an older Quaternary fault (early to mid-Pleistocene) and/or a very slow-moving fault.…”

Section: Gallina-nacimiento Fault Systemmentioning

confidence: 99%

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Low‐Rate Faulting on the Margin of the Colorado Plateau and Rio Grande Rift in North‐Central New Mexico

Jobe

Chupik

2021

Tectonics

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In northern New Mexico, seismic hazard outside of the Rio Grande Rift (RGR) is generally considered low due to limited historical seismicity and few mapped Quaternary faults. Although the region has a complex tectonic history, nearly all known faults are considered inactive because of a lack of faulted Quaternary deposits. Analysis of lidar and existing geologic and geomorphic mapping permits identification and characterization of four faults on the Colorado Plateau/RGR margin. The Gallina, Willow Creek, and East and West Brazos Peak faults are normal or dextral‐normal faults that strike NW‐SE with lengths from 15 to 50 km. The Willow Creek fault has scarp heights <0.5–6.4 m on five Quaternary surfaces, with displacement increasing with relative surface age. An ∼5‐m‐high scarp on the ∼250 ka Brazos basalt yields an ∼0.02 mm/yr minimum dip‐slip rate. Oblique slip is recorded by dextral offset (∼40 m) of a middle Quaternary (?) terrace riser, a linear and en‐echelon stepping fault pattern, and a consistent down‐to‐the‐northeast fault expression. The West Brazos Peak fault displaces late Quaternary (?) surfaces by <4 m down‐to‐the‐southwest. We interpret these faults are Laramide‐aged faults reactivated as normal or dextral‐oblique faults in the Quaternary, consistent with regional stress and geodetic data. Although the faults have low slip rates (<0.1 mm/yr), the fault lengths suggest they may rupture in M6‐7 earthquakes and may pose a previously unrecognized seismic hazard to the region. Dextral transtension within the eastern Colorado Plateau is consistent with geodetic strain rates and earthquake focal mechanisms.

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Progradational‐to‐retrogradational styles of Palaeogene fluvial fan successions in the San Juan Basin, New Mexico

Zellman,

Plink‐Björklund,

Spangler

2023

Basin Research

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Basin‐scale outcrop analyses of fluvial architecture in the Palaeogene San Juan Basin, New Mexico, document lateral and vertical trends in channel, floodplain and palaeosol characteristics. Herein, the uppermost part of the Palaeocene Nacimiento Formation and lower Eocene Cuba Mesa and Regina Members of the San Jose Formation are identified as deposits of large fluvial fans based on trends observed across the basin. Stratigraphic trends suggest two packages originated by fluvial fan progradation. Progradation of the lower fan system provides a new explanation for the transitional nature of a disconformity at the Nacimiento–San Jose Formation contact, previously thought to be a low‐angle unconformity. The two fan systems are separated by a retrogradational interval that culminates in a depositional hiatus at the contact between the Cuba Mesa and Regina Members. This, combined with poor age constraints, indicates that the duration of the disconformity at the base of the Cuba Mesa Member may have been overestimated. Furthermore, the succession is interpreted as deposits of variable‐discharge rivers, based on the combined abundance of upper flow regime and high deposition rate sedimentary structures indicative of intense flooding events, preservation of in‐channel bioturbation and paedogenic modification indicating periods of prolonged dryness, lack of identifiable bar strata and alternations of poorly drained and well‐drained floodplain deposits with pedofacies indicating alternating wet–dry cycles. This dataset adds to a growing body of evidence linking the formation of large fluvial fans to discharge variability and thus to hydroclimates with significant inter‐ and intra‐annual precipitation variability and intense rainfall. A long‐term stratigraphic shift from poorly drained to well‐drained floodplain deposits across two progradational fan successions indicates that a predictive model suggesting downstream decreases in soil drainage conditions is not encompassing of all large fan systems, and instead suggests a transition to a more arid climate across the Palaeocene–Eocene boundary.

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Preliminary geologic map of the Aztec 1° x 2° quadrangle, northwestern New Mexico and southern Colorado

Cited by 5 publications

References 1 publication

Lineaments derived from analysis of linear features mapped from Landsat images of the Four Corners region of the Southwestern United States

Lineaments derived from analysis of linear features mapped from Landsat images of the Four Corners region of the Southwestern United States

Low‐Rate Faulting on the Margin of the Colorado Plateau and Rio Grande Rift in North‐Central New Mexico

Progradational‐to‐retrogradational styles of Palaeogene fluvial fan successions in the San Juan Basin, New Mexico

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