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Featured researches published by Laurie Wirt.


Geochimica et Cosmochimica Acta | 1993

HIGH-PRECISION MEASUREMENT OF CHLORINE STABLE ISOTOPE RATIOS

Austin Long; Christopher J. Eastoe; Ronald S. Kaufmann; Jennifer G Martin; Laurie Wirt; Jim B. Finley

We present an analysis procedure that allows stable isotopes of chlorine to be analyzed with precision sufficient for geological and hydrological studies. The total analytical precision is ≤±0.09%., and the present known range of chloride in the surface and near-surface environment is 3.5‰. As Cl− is essentially nonreactive in natural aquatic environments, it is a conservative tracer and its δ37Cl is also conservative. Thus, the δ37Cl parameter is valuable for quantitative evaluation of mixing of different sources of chloride in brines and aquifers.


Environmental Earth Sciences | 2012

Using geochemistry to identify the source of groundwater to Montezuma Well, a natural spring in Central Arizona, USA: part 2

Raymond H. Johnson; Ed DeWitt; Laurie Wirt; Andrew H. Manning; Andrew G. Hunt

Montezuma Well is a natural spring located within a “sinkhole” in the desert environment of the Verde Valley in Central Arizona. It is managed by the National Park Service as part of Montezuma Castle National Monument. Because of increasing development of groundwater in the area, this research was undertaken to better understand the sources of groundwater to Montezuma Well. The use of well logs and geophysics provides details on the geology in the area around Montezuma Well. This includes characterizing the extent and position of a basalt dike that intruded a deep fracture zone. This low permeability barrier forces groundwater to the surface at the Montezuma Well “pool” with sufficient velocity to entrain sand-sized particles from underlying bedrock. Permeable fractures along and above the basalt dike provide conduits that carry deep sourced carbon dioxide to the surface, which can dissolve carbonate minerals along the transport path in response to the added carbon dioxide. At the ground surface, CO2 degasses, depositing travertine. Geologic cross sections, rock geochemistry, and semi-quantitative groundwater flow modeling provide a hydrogeologic framework that indicates groundwater flow through a karstic limestone at depth (Redwall Limestone) as the most significant source of groundwater to Montezuma Well. Additional groundwater flow from the overlying formations (Verde Formation and Permian Sandstones) is a possibility, but significant flow from these units is not indicated.


Open-File Report | 2005

Geologic framework of aquifer units and ground-water flowpaths, Verde River headwaters, north-central Arizona

Laurie Wirt; Ed DeWitt; V.E. Langenheim


Scientific Investigations Report | 2006

Geophysical framework based on analysis of aeromagnetic and gravity data, upper and middle Verde River watershed, Yavapai County, Arizona

Vicki E. Langenheim; Ed DeWitt; Laurie Wirt


Scientific Investigations Report | 2008

Uranium in Surface Waters and Sediments Affected by Historical Mining in the Denver West 1:100,000 Quadrangle, Colorado

Robert A. Zielinski; James K. Otton; R. Randall Schumann; Laurie Wirt


Open-File Report | 2007

Geochemistry of Surface and Ground Water in Cement Creek from Gladstone to Georgia Gulch and in Prospect Gulch, San Juan County, Colorado

Raymond H. Johnson; Laurie Wirt; Andrew H. Manning; Kenneth J. Leib; David L. Fey; Douglas B. Yager


Open-File Report | 2005

Preliminary geophysical framework of the upper and middle Verde River watershed, Yavapai County, Arizona

V.E. Langenheim; Ed DeWitt; Laurie Wirt


Open-File Report | 2011

Water and rock geochemistry, geologic cross sections, geochemical modeling, and groundwater flow modeling for identifying the source of groundwater to Montezuma Well, a natural spring in central Arizona

Raymond H. Johnson; Ed DeWitt; Laurie Wirt; L. Rick Arnold; John D. Horton


US Geological Survey professional paper | 2007

Geochemical and Hydrologic Processes Controlling Formation of Ferricrete

Laurie Wirt; Kirk R. Vincent; Philip L. Verplanck; Douglas B. Yager; Stanley E. Church; David L. Fey


Open-File Report | 2009

Geochemical Analyses of Rock, Sediment, and Water from the Region In and Around the Tuba City Landfill, Tuba City, Arizona

Raymond H. Johnson; Laurie Wirt

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Ed DeWitt

United States Geological Survey

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Raymond H. Johnson

United States Geological Survey

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Andrew H. Manning

United States Geological Survey

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David L. Fey

United States Geological Survey

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Douglas B. Yager

United States Geological Survey

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Andrew G. Hunt

United States Geological Survey

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