Geologie Structure of Yucca Flat Area, Nevada

Hinrichs, E.N.

doi:10.1130/mem110-p239

Cited by 17 publications

(20 citation statements)

References 1 publication

(1 reference statement)

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“…The northernmost tip of Yucca Flat contains Mesozoic intrusive bodies, the Gold Meadows stock just to the northwest of the basin, and the Climax stock, at the north end (Hinrichs, 1968). The basin fill is composed of mid to late Miocene volcanic deposits and Quaternary sediments.…”

Section: Introductionmentioning

confidence: 99%

Thickness of Cenozoic Deposits of Yucca Flat Inferred from Gravity Data, Nevada Test Site, Nevada

Phelps¹,

Langenheim²,

Jachens³

1999

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The basin-basement contact for Yucca Flat was modeled using isostatic gravity data, a linear density-depth function for the basin deposits, and drill-hole constraints to produce a digital database of both the depth to basement and the gravitational anomaly associated with the basement rocks. The model predicts a depth of roughly 2,500 m in the deepest, southern part of the basin. The model shows offsets in the basement rocks along both the Carpetbag and Yucca faults. The basement rocks of Yucca Flat have a higher gravity anomaly west of the N-S trending Carpetbag fault, suggesting higher density rocks on the west side of the valley.

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Section: Introductionmentioning

confidence: 99%

Thickness of Cenozoic Deposits of Yucca Flat Inferred from Gravity Data, Nevada Test Site, Nevada

Phelps¹,

Langenheim²,

Jachens³

1999

Open-File Report

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“…During late Cenozoic time, these rocks and the Cenozoic basin fill were affected by east-west extension that resulted in the formation of predominantly northstriking normal faults (Hinrichs, 1968). The Cenozoic volcanic units have been tilted west and have offset hundreds of meters by the major normal faults within the basin, including the Carpetbag, Topgallant, and Yucca faults (fig.…”

Section: Geologic Setting Of Yucca Flatmentioning

confidence: 99%

Detailed Geophysical Fault Characterization in Yucca Flat, Nevada Test Site, Nevada

Asch¹,

Sweetkind²,

Burton³

et al. 2009

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“…These units consist of a diverse assemblage of interbedded volcanic and sedimentary rocks deposited primarily in lacustrine and fluvial environments. Specific lithologies include ash-flow tuff, ash-fall tuff, and reworked tuff; shale; tuffaceous sandstone and argillaceous sandstone; siltstone and mudstone; conglomerate; and lesser limestone (Hinrichs, 1968;Barnes et al, 1982;Bohanon, 1984).…”

Section: Volcaniclastic Confining Unit (Vcu)mentioning

confidence: 99%

A Hydrostratigraphic Model and Alternatives for the Groundwater Flow and Contaminant Transport Model of Corrective Action Unit 97: Yucca Flat-Climax Mine, Lincoln and Nye Counties, Nevada

2006

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A new three-dimensional hydrostratigraphic framework model for the Yucca Flat-Climax Mine Corrective Action Unit was completed in 2005. The model area includes Yucca Flat and Climax Mine, former nuclear testing areas at the Nevada Test Site, and proximal areas. The model area is approximately 1,250 square kilometers in size and is geologically complex.Yucca Flat is a topographically closed basin typical of many valleys in the Basin and Range province. Faulted and tilted blocks of Tertiary-age volcanic rocks and underlying Proterozoic and Paleozoic sedimentary rocks form low ranges around the structural basin. During the Cretaceous Period a granitic intrusive was emplaced at the north end of Yucca Flat.A diverse set of geological and geophysical data collected over the past 50 years was used to develop a structural model and hydrostratigraphic system for the basin. These were integrated using EarthVision ® software to develop the 3-dimensional hydrostratigraphic framework model. Fifty-six stratigraphic units in the model area were grouped into 25 hydrostratigraphic units based on each unit's propensity toward aquifer or aquitard characteristics. The authors organized the alluvial section into 3 hydrostratigraphic units including 2 aquifers and 1 confining unit. The volcanic units in the model area are organized into 13 hydrostratigraphic units that include 8 aquifers and 5 confining units. The underlying pre-Tertiary rocks are divided into 7 hydrostratigraphic units, including 3 aquifers and 4 confining units. Other units include 1 Tertiary-age sedimentary confining unit and 1 Mesozoic-age granitic confining unit. The model depicts the thickness, extent, and geometric relationships of these hydrostratigraphic units ("layers" in the model) along with the major structural features (i.e., faults). The model incorporates 178 high-angle normal faults of Tertiary age and 2 low-angle thrust faults of Mesozoic age.The complexity of the model area and the non-uniqueness of some of the interpretations incorporated into the base model made it necessary to formulate alternative interpretations for some of the major features in the model. Five of these alternatives were developed so they could be modeled in the same fashion as the base model.

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Geologie Structure of Yucca Flat Area, Nevada

Abstract: The Yucca

Cited by 17 publications

References 1 publication

Thickness of Cenozoic Deposits of Yucca Flat Inferred from Gravity Data, Nevada Test Site, Nevada

Thickness of Cenozoic Deposits of Yucca Flat Inferred from Gravity Data, Nevada Test Site, Nevada

Detailed Geophysical Fault Characterization in Yucca Flat, Nevada Test Site, Nevada

A Hydrostratigraphic Model and Alternatives for the Groundwater Flow and Contaminant Transport Model of Corrective Action Unit 97: Yucca Flat-Climax Mine, Lincoln and Nye Counties, Nevada

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