3: Regional gravity and tectonic patterns: Their relation to late Cenozoic epeirogeny and lateral spreading in the western Cordillera

Eaton, Gordon P.; Wahl, Ronald R.; Prostka, Harold J.; Mabey, Don R.; Kleinkopf, M.D.

doi:10.1130/mem152-p51

Cited by 124 publications

(37 citation statements)

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“…These include lithospheric-scale tectonic features of rifting on continental crust, important aspects of the crust-mantle geochemical system, and clues to the nature of magmatic differentiation and the genesis of igneous rocks in the continental rift environment [e.g., Leeman, 1982 This area lies along the axis of geophysical symmetry outlined by Eaton et al [1978] for the central Great Basin, and is isolated from the well-developed volcanic fields of the Sierran Pliocene activity in the Reveille Range commenced with the eruption of a relatively large volume of alkalic basalt (5.1-5.9 Ma), which was followed by trachytic volcanism (4.3 Ma) and finally by a second eruptive episode of lower volume basalt (3.0-4.7 Ma, see Naumann et al [1991] for information on dates). These map units are shown in Figure 2 and will be referred to throughout this paper as (1) the episode 1 basalts, (2) the trachytic rocks, and (3) the episode 2 basalts.…”

Section: Introductionmentioning

confidence: 99%

Evolution of a mafic volcanic field in the central Great Basin, south central Nevada

Yogodzinski¹,

Naumann²,

Smith³

et al. 1996

J. Geophys. Res.

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Section: Introductionmentioning

confidence: 99%

Evolution of a mafic volcanic field in the central Great Basin, south central Nevada

Yogodzinski¹,

Naumann²,

Smith³

et al. 1996

J. Geophys. Res.

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“…At the subregional scale of the study area, this correlation is not apparent because the correlation is due to very long wavelength phenomenon on sub-continental and regional scales. The regional Bouguer-to-elevation inverse correlation is apparent on the Simple Bouguer map of Eaton et al (1978), which is shown on Figure C-3. On this figure, the labeled regional gravity low is due to the regional uplift, lithospheric thinning, and upwelling of hot aesthenosphere beneath the Basin and Range Province and its environs to the north.…”

Section: C-1 Gravity Datamentioning

confidence: 99%

“…The bulk of this evaluation relies on the Geophysical Data for the Northern Rocky Mountains with the data sets of Eaton et al (1978) and used to clarify specific characteristics of the geophysical data.…”

Section: C-6mentioning

confidence: 99%

“…Gravity and aeromagnetic evaluation of the study area utilized the newly published ) USGS Geophysical Data for the Northern Rocky Mountains, the Western Cordillera gravity analysis of Eaton et al (1978), and the original USGS aeromagnetic and gravity data collected at the INL . The bulk of this evaluation relies on the Geophysical Data for the Northern Rocky Mountains with the data sets of Eaton et al (1978) and used to clarify specific characteristics of the geophysical data.…”

Section: C-6mentioning

confidence: 99%

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Development Report on the Idaho National Laboratory Sitewide Three-Dimensional Aquifer Model

Wood¹,

Helm-Clark²,

Huang³

et al. 2007

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A sub-regional scale, three-dimensional flow model of the Snake River Plain Aquifer was developed to support remediation decisions for Waste Area Group 10, Operable Unit 10-08 at the Idaho National Laboratory (INL) Site. This model has been calibrated primarily to water levels and secondarily to groundwater velocities interpreted from stable isotope disequilibrium studies and the movement of anthropogenic contaminants in the aquifer from facilities at the INL. The three-dimensional flow model described in this report is one step in the process of constructing a fully three-dimensional groundwater flow and contaminant transport model as prescribed in the Idaho National Engineering and Environmental Laboratory Operable Unit 10-08 Sitewide Groundwater Model Work Plan.An updated three-dimensional hydrogeologic conceptual model is presented along with the geologic basis for the conceptual model. Sediment-dominated three-dimensional volumes were used to represent the geology and constrain groundwater flow as part of the conceptual model. Hydrological, geochemical, and geological data were summarized and evaluated to infer aquifer behavior. A primary observation from development and evaluation of the conceptual model was that relative to flow on a regional scale, the aquifer can be treated with steady-state conditions. Boundary conditions developed for the three-dimensional flow model are presented along with inverse simulations that estimate parameterization of hydraulic conductivity. Inverse simulations were performed using the pilot-point method to estimate permeability distributions. Thermal modeling at the regional aquifer scale and at the sub-regional scale using the inverted permeabilities is presented to corroborate the results of the flow model.The results from the flow model show good agreement with simulated and observed water levels almost always within 1 meter. Simulated velocities show generally good agreement with some discrepancies in an interpreted low-velocity region near the toe of the Arco Hills. This discrepancy persisted in each of the aquifer bottom thickness scenarios that were simulated precluding decisions on which aquifer bottom thickness to use in transport simulations. When joint-calibration was performed using both water levels and velocities assigned as calibration targets, the discrepancy was prevented. This result highlighted the need to consider multiple calibration objectives and not rely solely on calibration to water levels.

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“…These intrusions include the Climax, Gold Meadows, and Twin Ridge Stocks. Emplacement of the Gold Meadows Stock occurred near the Jurassic,Cretaceous boundary, but timing of the other two stocks is uncertain (Gibbons et al 1963 Eaton et al 1978). Interbedded with these silicic tufts and rhyolites are minor deposits of basalt, andesite, tuffaceous alluvium, and breccia.…”

Section: Geologic Histqrymentioning

confidence: 99%

Remote geologic structural analysis of Yucca Flat

Foley¹,

Heasler²,

Hoover

et al. 1991

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The Remote Geologic Analysis (RGA) system was developed by Pacific Northwest Laboratory (PNL) to identify crustal structures that may affect seismic wave propagaUon from nuclear tests. Using automated methods, the RGA system identifies all valleys in a digital elevation model (DEM), fits three-dimensional vectors to valley bottoms, and catalogs all potential fracture or fault planes defined by coplanar pairs of valley vectors. The system generates a cluster hierarchy of planar features having greater-than-random density that may represent areas of anomalous to-" pography manifesting structural control of erosional drainage development. Because RGA uses computer methods to identify zones of hypothesized structural control of topography, ground truth using a weU-characterized test site was critical in our evaluation of RGA's characterization of inaccessible test sites for seismic verification studies. Therefore, we applied RGA to a study area centered on Yucca Flat at the Nevada Test Site (NTS) and compared our results with both mapped geology and geologic structures and with seismic yield-magnitude models. This is the final report of PNL's RGA developmem project for peer review within the U.S. Department of Energy Office of Arms Control (OAC) seismic-verification coL_-nunity. In this report, we discuss the Yucca Flat study area, the analytical basis of the RGA system and its application to Yucca Flat, the results of the analysis, and the relation of the analytical results to known topography, geology, and geologic structures.Our analysis consisted of three parts.The first part was a geomorphic pattern-recognition analysis in which we applied a valley-finder algorithm, a vector-flttir_g algorithm, and coplanar analysis to the entire Yucca Flat DEM to identify coplanar valley segments that may be evidence of erosional control by planar fracture zones. The RGA algorithms generated 26,473 planes from the Yucca Flat area of the NTS. In the second part, we used statistical cluster analysis to locate zones of coplanar valley segments that were of anomalously high density (compared with random associations), which were the final output of the remote analysis. We derived several thousand clusters containing as many as 2,351 planes. From these, we picked the most significant clusters based on statistical and geologic criteriadeveloped in previous test applications; the result was 21 clusters to be evaluated with geologic and geophysical data from Yucca Flat. In the third part, we compared output of the remote analysis with topographic, geologic, and geophysical features to evaluate structural significance.By comparing these clusters with topographic, geologic, and geophysical data for Yucca Flat, we concluded that H_ accurately detects vaneys in the DEM, performs accurate coplanar correlations, and isolates statistically meaningful plane clusters that can be ranked in order of significance. While segments of RGA plane clusters correlate with numerous mapped faults, no sini, gle fault or associations of fault zones seem to ...

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3: Regional gravity and tectonic patterns: Their relation to late Cenozoic epeirogeny and lateral spreading in the western Cordillera

Cited by 124 publications

References 0 publications

Evolution of a mafic volcanic field in the central Great Basin, south central Nevada

Evolution of a mafic volcanic field in the central Great Basin, south central Nevada

Development Report on the Idaho National Laboratory Sitewide Three-Dimensional Aquifer Model

Remote geologic structural analysis of Yucca Flat

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