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in creator/contributor: "Prothro, Lance"  
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open access

Mineralogic Zonation Within the Tuff Confining Unit, Yucca Flat, Nevada Test Site

Description: Recently acquired mineralogic data from drill hole samples in Yucca Flat show that the tuff confining unit (TCU) can be subdivided into three mineralogic zones based on the relative abundances of primary and secondary mineral assemblages. These zones are (1) an upper zone characterized by the abundance of the zeolite mineral clinoptilolite with lesser amounts of felsic and clay minerals; (2) a middle zone with felsic minerals dominant over clinoptilolite and clay minerals; and (3) a basal argil… more
Date: September 1, 2005
Creator: Prothro, Lance
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Analysis of Fracture in Cores from the Tuff Confining Unit beneath Yucca Flat, Nevada Test Site

Description: The role fractures play in the movement of groundwater through zeolitic tuffs that form the tuff confining unit (TCU) beneath Yucca Flat, Nevada Test Site, is poorly known. This is an important uncertainty, because beneath most of Yucca Flat the TCU lies between the sources of radionuclide contaminants produced by historic underground nuclear testing and the regional carbonate aquifer. To gain a better understanding of the role fractures play in the movement of groundwater and radionuclides thr… more
Date: March 1, 2008
Creator: Prothro, Lance
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

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

Description: 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 eno… more
Date: January 31, 2009
Creator: Prothro, Lance; Drellack, Sigmund, Jr. & Mercadante, Jennifer
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Lithology and Stratigraphy of Holes Drilled in LANL-Use Areas of the Nevada Test Site

Description: Geologic data for ten holes drilled in areas used by Los Alamos National Laboratory at the Nevada Test Site are presented in this report. The holes include emplacement holes, instrumentation holes, and Underground Test Area wells drilled during calendar years 1991 through 1995. For each hole a stratigraphic log, a detailed lithologic log, and one or two geologic cross sections are presented, along with a supplemental data sheet containing information about the drilling operations, geology, or r… more
Date: July 1, 1999
Creator: Prothro, Lance B.; Sigmund L. Drellack, Jr. & Allen, Brian M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Thoughts Regarding the Dimensions of Faults at Rainier and Aqueduct Mesas, Nye County, Nevada, Based on Surface and Underground Mapping

Description: The geologic setting and history, along with observations through 50 years of detailed geologic field work, show that large-displacement (i.e., greater than 30 meters of displacement) syn- to post-volcanic faults are rare in the Rainier Mesa area. Faults observed in tunnels and drill holes are mostly tight, with small displacements (most less than 1.5 meters) and small associated damage zones. Faults are much more abundant in the zeolitized tuffs than in the overlying vitric tuffs, and there is… more
Date: February 1, 2011
Creator: Drellack, Sigmund L.; Prothro, Lance B.; Townsend, Margaret J. & Townsend, Dean R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Observations on Faults and Associated Permeability Structures in Hydrogeologic Units at the Nevada Test Site

Description: Observational data on Nevada Test Site (NTS) faults were gathered from a variety of sources, including surface and tunnel exposures, core samples, geophysical logs, and down-hole cameras. These data show that NTS fault characteristics and fault zone permeability structures are similar to those of faults studied in other regions. Faults at the NTS form complex and heterogeneous fault zones with flow properties that vary in both space and time. Flow property variability within fault zones can be … more
Date: March 30, 2009
Creator: Prothro, Lance B.; Drellack, Sigmund L.; Haugstad, Dawn N.; Huckins-Gang, Heather E. & Townsend, Margaret J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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