Geologic Map of the Death Valley Ground-water Model Area, Nevada and California

Workman, Jeremiah B.; Menges, Christopher M.; Page, William R.; Ekren, E.B.; Rowley, Peter D.; Dixon, G.L.

doi:10.2172/809981

Cited by 24 publications

(27 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The silicified zone was misclassified into unaltered areas because the silicified rocks had no or weak diagnostic absorptions from 2.0 to 2.5 µm. The number of classes, which was necessary and important input for k-means clustering, was determined as 10, based on the number of geologic formations in the existing geological map (Workman et al, 2002). Figure 3 shows the result of kmeans clustering.…”

Section: Resultsmentioning

confidence: 99%

Geological Mapping by Combining Spectral Unmixing and Cluster Analysis for Hyperspectral Data

Ishidoshiro¹,

Yamaguchi²,

Noda³

et al. 2016

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

View full text Add to dashboard Cite

Commission VIII, WG VIII/5 KEY WORDS: Geology, Mineral, Unmixing, Cluster Analysis, Hyperspectral, Cuprite ABSTRACT:Spectral unmixing of hyperspectral data often fails to select some minerals and rocks having flat spectra but no diagnostic absorption features as endmembers, even if they are actually important endmembers. To avoid this problem, we propose a novel approach that combined two methods: spectral unmixing and full-pixel classification. First, all pixels were divided into two categories, hydrothermally altered areas and unaltered rocks based on the absorption depth of 2.0 to 2.5 µm. For the hydrothermally altered areas, endmembers were extracted by the Improved Causal Random Pixel Purity Index (ICRPPI) method, which was improved from the existing Pixel Purity Index (PPI) and Causal Random Pixel Purity Index (CRPPI) methods. Endmember abundance in each pixel was calculated by linear spectral unmixing. In a separate operation, k-means clustering was applied to the unaltered rock areas. Finally, the results of these two methods were combined to generate a single distribution map of rocks and minerals. This approach was applied to the airborne hyperspectral HyMap data of Cuprite, Nevada, U.S.A. We confirmed that our mapping result was consistent with the existing geological map as well as our field survey result.

show abstract

Section: Resultsmentioning

confidence: 99%

Geological Mapping by Combining Spectral Unmixing and Cluster Analysis for Hyperspectral Data

Ishidoshiro¹,

Yamaguchi²,

Noda³

et al. 2016

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

View full text Add to dashboard Cite

show abstract

“…The geologic quadrangle maps are an extremely valuable resource, and the UGTA Sub-Project is fortunate to have access to such basic, high quality geologic data. Larger scale geologic compilation maps include Frizzell and Shulters (1990), Slate et al (1999), and Workman et al (2002).…”

Section: Geologic Mappingmentioning

confidence: 99%

A Hydrostratigraphic System for Modeling Groundwater Flow and Radionuclide Migration at the Corrective Action Unit Scale, Nevada Test Site and Surrounding Areas, Clark, Lincoln, and Nye Counties, Nevada

Prothro¹,

Drellack²,

Mercadante³

2009

View full text Add to dashboard Cite

Underground Test Area (UGTA) corrective action unit (CAU) groundwater flow and contaminant transport models of the Nevada Test Site (NTS) and vicinity are built upon hydrostratigraphic framework models (HFMs) that utilize the hydrostratigraphic unit (HSU) as the fundamental modeling component. The delineation and three-dimensional (3-D) modeling of HSUs within the highly complex geologic terrain that is the NTS requires a hydrostratigraphic system that is internally consistent, yet flexible enough to account for overlapping model areas, varied geologic terrain, and the development of multiple alternative HFMs. The UGTA CAUscale hydrostratigraphic system builds on more than 50 years of geologic and hydrologic work in the NTS region. It includes 76 HSUs developed from nearly 300 stratigraphic units that span more than 570 million years of geologic time, and includes rock units as diverse as marine carbonate and siliciclastic rocks, granitic intrusives, rhyolitic lavas and ash-flow tuffs, and alluvial valley-fill deposits.The UGTA CAU-scale hydrostratigraphic system uses a geology-based approach and two-level classification scheme. The first, or lowest, level of the hydrostratigraphic system is the hydrogeologic unit (HGU). Rocks in a model area are first classified as one of ten HGUs based on the rock's ability to transmit groundwater (i.e., nature of their porosity and permeability), which at the NTS is mainly a function of the rock's primary lithology, type and degree of postdepositional alteration, and propensity to fracture.

show abstract

“…Briefly, the basin is bounded to the east and west by ranges underlain by Neoproterozoic through Palaeozoic carbonates, quartzites, and Tertiary volcanic rocks (Workman et al 2002). To the south, a sequence of poorly consolidated Tertiary debris flows, fanglomerate, pumice beds and gypsum-bearing mudstones (China Ranch beds; Hillhouse, 1987) bound the basin.…”

Section: Geologic and Hydrogeologic Settingmentioning

confidence: 99%

“…2(a) is north of the tufa deposits, and shows that rocks of the siliciclastic aquitard comprise a barrier in the Resting Spring Range at that location. However, immediately east of the tufa deposits, bedrock of the Resting Spring Range is dominated by rocks of the carbonate aquifer (Workman et al, 2002;Thomas et al, 1996). Finally, flow from the California-Nevada state line westward would be against the dip of bedding in the carbonate aquifer, which is known to contain impermeable interbeds (e.g.…”

Section: Sources Of Palaeodischargementioning

confidence: 99%

“…Interbasin flow is viewed to occur wherever carbonate rocks are in continuous contact as an aquifer through which water may shaded arrows labelled 1 and 2 indicate possible palaeoflowpaths discussed in the text. Bedrock, faults and potentiometric contours were adapted from Workman et al (2002). Imperfect correlation between the mapped fault and tufa locations may be due to errors in geo-referencing, discharge controlled within a fault zone, and the fact that the fault was mapped as concealed transit multiple basins and ranges.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Using fossil spring deposits in the Death Valley region, USA to evaluate palaeoflowpaths

Miner

Nelson

Tingey

et al. 2007

J Quaternary Science

View full text Add to dashboard Cite

Spring deposits reveal the timing and environment of past groundwater discharge. Herein, however, the potential for fossil spring deposits to infer water sources and palaeoflowpaths through trace elements and stable and radiogenic isotopes is examined.Past discharge (70 to 285 ka) in the Tecopa Basin in the Death Valley region of southeastern California is represented by tufa deposits, including mounds, pools, cemented ledges and rare calcite feeder veins. d 18 O values indicate that spring discharge was a mixture of far-travelled (regional) water with a significant, and perhaps dominant contribution of local recharge on a nearby range front and alluvial pediment, rather than simply representing an elevated regional water table. d 13 C values indicate regional water had a high TDS, whereas solute data imply low overall solute contents, consistent with dilution by a large component of local recharge.Radiogenic isotope data (U-series, 87 Sr/ 86 Sr) for tufa indicate that siliciclastic rocks (a regional aquitard) interacted with discharging water. To access this aquitard, regional flow was probably partitioned into a permeable north-south damage zone of a north-south range-bounding fault along the foot of the Resting Spring Range, which ultimately controlled the location of groundwater discharge. Existing models for modern discharge in the Tecopa Basin, by contrast, call upon westward interbasin flow in carbonate rocks from the Spring Mountains through the intervening (and nearly perpendicular) Nopah and Resting Spring Ranges. Understanding the controls on regional groundwater flow is critical in this and other arid regions where water is, by definition, a scarce resource. Thus, although it is a case study, this report highlights a fruitful approach to palaeohydrology that can be widely applied.

show abstract

Geologic Map of the Death Valley Ground-water Model Area, Nevada and California

Cited by 24 publications

References 42 publications

Geological Mapping by Combining Spectral Unmixing and Cluster Analysis for Hyperspectral Data

Geological Mapping by Combining Spectral Unmixing and Cluster Analysis for Hyperspectral Data

A Hydrostratigraphic System for Modeling Groundwater Flow and Radionuclide Migration at the Corrective Action Unit Scale, Nevada Test Site and Surrounding Areas, Clark, Lincoln, and Nye Counties, Nevada

Using fossil spring deposits in the Death Valley region, USA to evaluate palaeoflowpaths

Contact Info

Product

Resources

About