Geophysical framework of the southwestern Nevada volcanic field and hydrogeologic implications

Grauch, V.J.S.; Sawyer, David A.; Fridrich, Christopher J.; Hudson, Mark R.

doi:10.3133/pp1608

Cited by 18 publications

(17 citation statements)

References 38 publications

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“…This structural bench, designated the Northwestern Timber Mountain Bench by Warren et al (2000) but referred to as simply the Bench in this and other Phase II documents (SNJV, 2009a;NNSA/NSO, 2010a), is bounded on the north by the NTMMSZ and on the south by the buried northern structural margin of the TMCC (Figure 4-1). The NTMMSZ is a north-northwest trending buried structural zone first recognized geophysically (Mankinen et al, 1999;Grauch et al, 1999) and subsequently confirmed by data from PM-OV Phase I drilling (DOE/NV, 2000b). The NTMMSZ is a down-on-the-southwest fault (or fault zone) that displaces rock units as young as the Rainier Mesa Tuff by more than 300 m (1,000 ft).…”

Section: Geologic Settingmentioning

confidence: 78%

Completion Report for Wells ER-20-8 and ER-20-8#2 Corrective Action Units 101 and 102: Central and Western Pahute Mesa

2011

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, as part of the Pahute Mesa Phase II drilling program. The primary purpose of these wells was to provide detailed hydrogeologic information in the Tertiary volcanic section that will help address uncertainties within the Pahute Mesa-Oasis Valley hydrostratigraphic framework model. They may also be used as long-term monitoring wells. The original plan was to drill one well, with completion zones in each of three aquifers originally predicted at this location. However, a fourth aquifer located below the first aquifer was unexpectedly encountered and contained low levels of tritium. The upper two aquifers were isolated behind casing before drilling into the lower aquifers in Well ER-20-8.Well ER-20-8#2 was then drilled on the same pad and did not penetrate the lower two aquifers; completions were installed in the upper two aquifers.

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Section: Geologic Settingmentioning

confidence: 78%

Completion Report for Wells ER-20-8 and ER-20-8#2 Corrective Action Units 101 and 102: Central and Western Pahute Mesa

2011

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“…However, these data are insufficient to uniquely constrain the groundwater flow and transport models. Multiple configurations of the groundwater flow and as the "corridor" in the geophysical framework report of Grauch et al (1999). Those same geochemical mixing models indicate limited flow along the east side of Timber Mountain.…”

Section: Summary Of Phase I Flow and Transport Modelingmentioning

confidence: 97%

Phase II Corrective Action Investigation Plan for Corrective Action Units 101 and 102: Central and Western Pahute Mesa, Nevada Test Site, Nye County, Nevada, Revision 2 with ROTC 1 and 2

Marutzky

2009

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“…ground penetrating radar and resistivity profile) and surface structural analyses with the monitoring of water level to characterize the joint system of an aquifer and its water flow (Degnan et al 2004). Other geophysical methods that improve the identification of subsurface structures -and, thus, of potential water flow paths -are the electric, magnetic and gravity (Grauch et al 1999;Robinson et al 2008). However, some regional scale methods, such as the airborne surveys (Grauch et al 1999;Robinson et al 2008), are usually part of larger and governmental projects due to their high cost, not always related to geological surveys, although they may be used in the studies such as the ones discussed here.…”

Section: Geophysical Surveysmentioning

confidence: 99%

Structural hydrogeology in the Kenogami uplands, Quebec, Canada /

Silva¹

2012

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Characterizing the joint system is a very significant component of investigations on fractured rock aquifers, as the secondary porosity controls the groundwater flow. It is also important to analyze the types of interactions between the joints, e.g., the types of termination and the dominancy of a certain joint set, since such information helps to understand the tectonic events that were responsible for the generation of the joint systems in the aquifer. Moreover, the current stress field is usually the most significant in controlling joint aperture, which plays a major role in groundwater flow.The main objective of this work is to characterize an aquifer in fractured crystalline rocks with a fairly homogeneous lithology, defining a hydrogeological model of the study area, through structural surveys at different scales and hydrogeologic data analyses. This study was carried out in the Kenogami uplands, within the Saguenay graben, Quebec. It aimed to answer the following questions: (1) is there a structured joint system in the bedrock, that is, is it possible to identify preferential joint orientations and structural domains? (2) Can joint systems be defined at different scales, e.g. regional and local scales? If yes, are there any relationships between the systems observed at different scales? (3) Can any correlation between the joint system(s) and the past and present stress fields be identified? (4) Is there a relationship between the hydrogeological properties obtained from boreholes and the joint system(s)?The structural survey involved three main phases. First, a characterization at the regional scale of the joint system is derived from air photo interpretation, lineament analysis, and a general field survey at selected sites. The latter involves the investigation IV of the spatial distribution of the main joint sets, and the study of the relative ages of joint sets and past stress field components conducted on horizontal outcrops. Second, a detailed structural survey of selected road cuts was carried out to define and characterize the main joint sets that compose the joint system in the study area. Third, the realization of geophysical borehole logging provided valuable information at depth, especially regarding subhorizontal joint sets. These steps allowed to answer the questions proposed in the beginning of this research.This project allowed the characterization of an aquifer in fractured crystalline rocks, regarding the following aspects: joint systems at different scales, past stress fields, hydraulic properties and the possible relationships between these parameters. The methodology adopted may be applied to other studies on fractured rock aquifers.Finally, a conceptual model was developed for the fractured rock aquifer in the Kenogami uplands, using the unit block approach. This model may be extrapolated to a regional scale, and it reflects the predominance of the subvertical joints in the study area.Other contributions from this work include the introduction of procedures for applying Terzag...

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Geophysical framework of the southwestern Nevada volcanic field and hydrogeologic implications

Cited by 18 publications

References 38 publications

Completion Report for Wells ER-20-8 and ER-20-8#2 Corrective Action Units 101 and 102: Central and Western Pahute Mesa

Completion Report for Wells ER-20-8 and ER-20-8#2 Corrective Action Units 101 and 102: Central and Western Pahute Mesa

Phase II Corrective Action Investigation Plan for Corrective Action Units 101 and 102: Central and Western Pahute Mesa, Nevada Test Site, Nye County, Nevada, Revision 2 with ROTC 1 and 2

Structural hydrogeology in the Kenogami uplands, Quebec, Canada /

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