Geologic map of Tippipah Spring quadrangle, Nye County, Nevada

Orkild, P.P.

doi:10.3133/ofr61113

Cited by 20 publications

(37 citation statements)

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“…The geology encountered at UE20c ( of the TYBO-BENHAM area (Barnes et al, 1963;Gibbons et al, 1963;Orkild, 1963). The most plausible explanation for the presence of shale and siltstone within the UE20c samples is that they were introduced into the UE20c circulation system during drilling by equipment that had not been thoroughly cleaned from previous drilling operations.…”

Section: Geology Of Ue20cmentioning

confidence: 99%

Geology in the Vicinity of the TYBO and BENHAM Underground Nuclear Tests, Pahute Mesa, Nevada Test Site

Prothro¹

2001

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Recent radiochemical evidence from groundwater characterization and monitoring wells in the vicinity of the TYBO and BENHAM underground nuclear tests in Area 20 of the Nevada Test Site, suggests that migration of radionuclides within groundwater beneath this portion of Area 20 may be more rapid than previously thought. In order to gain a better understanding of the hydrogeologic conditions in the TYBO-BENHAM area for more accurate flow and transport modeling, a reevaluation of the subsurface geologic environment in the vicinity of the two underground tests was conducted. Eight existing drill holes provided subsurface control for the area. These holes included groundwater characterization and monitoring wells, exploratory holes, and large-diameter emplacement holes used for underground nuclear weapons tests. Detailed and consistent geologic descriptions of these holes were produced by updating existing geologic descriptions with data from petrographic, chemical, and mineralogic analyses, and current stratigraphic concepts of the region. The updated descriptions, along with surface geologic data, were used to develop a detailed geologic model of the TYBO-BENHAM area. This model is represented by diagrams that correlate stratigraphic, lithologic, and alteration intervals between holes, and by isopach and structure maps and geologic cross sections. Regional data outside the TYBO-BENHAM area were included in the isopach and structure maps to better evaluate the geology of the TYBO-BENHAM area in a regional context. The geologic model was then evaluated with regard to groundwater flow and radionuclide migration to assess the model's implications for flow and transport modeling. Implications include: 1) confirmation of the general hydrogeology of the area described in previous studies; 2) the presence of two previously unrecognized buried faults that could act as zones of enhanced permeability within aquifers; and 3) secondary alteration within tuff confining units that is much more complex than previously described.iv This page intentionally left blank.

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Section: Geology Of Ue20cmentioning

confidence: 99%

Geology in the Vicinity of the TYBO and BENHAM Underground Nuclear Tests, Pahute Mesa, Nevada Test Site

Prothro¹

2001

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“…As in Yucca Flat, these silicic volcanic tuffs were deposited unconformably on an irregular pre-Tertiary (upper Precambrian and Paleozoic age) surface of sedimentary rocks (Gibbons et al, 1963;Orkild, 1963) NSTec, 2007). All the rocks in the Rainier Mesa-Shoshone Mountain (RM-SM) study area can be classified as one of nine HGUs, which include the AA, four volcanic HGUs, two intrusive units, and two HGUs that represent the pre-Tertiary rocks (see Table A -3).…”

Section: Physiographymentioning

confidence: 99%

“…The hydrostratigraphy of the pre-Tertiary section at Shoshone Mountain is surmised from a single deep drill hole, Well ER-16-1 (NNSA/NSO, 2006a), and from surficial geology (Orkild, 1963). From oldest to youngest, the hydrogeologic section for the Shoshone Mountain UGTA consists of the regional carbonate aquifer, the upper clastic confining unit, tuff confining units, vitric-tuff aquifers, and welded-tuff aquifers at the surface ( Figure A-11).…”

Section: Physiographymentioning

confidence: 99%

Nevada National Security Site Environmental Report 2010, Attachment A: Site Description

Wills¹

2011

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“…As in Yucca Flat, these silicic volcanic tuffs were deposited unconformably on an irregular pre-Tertiary (upper Precambrian and Paleozoic) surface of sedimentary rocks (Gibbons et al, 1963;Orkild, 1963) Table A-7).…”

Section: A554 Rainier Mesa/shoshone Mountainmentioning

confidence: 99%

Nevada Test Site Environmental Report 2003

Nevada¹

2004

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Introduction section which formerly included a description of the NTS and its environment, the NTS mission, and history of the site. The environmental description of the site was expanded to include climatology and cultural resources and was placed in a stand-alone appendix. A description of NTS missions and its history were placed in the Executive Summary. There are five major portions or divisions of the NTSER. The summary below is provided so the reader can see the overall organization and content of the report. Summary of SectionsExecutive Summary -This portion of the report is meant to provide the reader with: (1) the purpose of the NTSER, (2) the current mission and history of the NTS, (3) a description of possible radiological dose pathways to the public, (4) a description of any radiological releases, (5) the estimated radiological dose to the public resulting from site operations, (6) a description of any non-radiological releases from the site, (7) a summary of any environmental incidents of noncompliance that occurred during the year and actions taken in response to them, (8) a description of the management system used to ensure that work is conducted in compliance with environmental and public health protection, and (9) a summary of any significant environmental program or effort.Compliance Summary -The purpose of this portion (Section 1.0) of the NTSER is to: (1) present those federal, state, and local environmental regulations which govern how operations are conducted on the NTS in order to ensure that the environment and the public are protected; (2) present in tabular form a concise summary of how NTS operations complied with these regulations during the year; and (3) direct the reader to subsequent sections of this NTSER where environmental activities and programs are described in more detail. This section is divided into multiple subsections based on the type of regulations presented (e.g., water quality regulations are presented in a separate subsection from historic preservation regulations). There are a total of 12 sections within the Compliance Summary (Sections 1.1 -1.12), the last section being a list of all active environmental permits. Environmental Monitoring and Compliance Activities -This portion constitutes the main body of the NTSER.It is divided into multiple sections (Sections 2.0 -12.0) which present the reporting year's environmental compliance activities related to monitoring and protecting the public, air, water, biota, cultural resources, and sensitive species and ecosystems on the NTS. These are the sections of the NTSER which are specifically referenced in the Compliance Summary, Section 1.0 and which support the compliance determinations presented in summary tabular form in Section 1.0. They include:• Radiological and Non-Radiological Air Monitoring -presents the methods and results of monitoring radioactive air emissions and non-radioactive air emissions (e.g., other air pollutants) on the NTS which are a result of past and present NTS operations.• Radiological and Non-R...

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Geologic map of Tippipah Spring quadrangle, Nye County, Nevada

Cited by 20 publications

References 0 publications

Geology in the Vicinity of the TYBO and BENHAM Underground Nuclear Tests, Pahute Mesa, Nevada Test Site

Geology in the Vicinity of the TYBO and BENHAM Underground Nuclear Tests, Pahute Mesa, Nevada Test Site

Nevada National Security Site Environmental Report 2010, Attachment A: Site Description

Nevada Test Site Environmental Report 2003

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