Andrew G Hunt
Andy Hunt is a Research Geologist with the Geology, Geophysics, and Geochemistry Science Center.
Science and Products
Filter Total Items: 66
Geochemical investigation of the hydrothermal system on Akutan Island, Alaska, July 2012 Geochemical investigation of the hydrothermal system on Akutan Island, Alaska, July 2012
We have studied the geochemistry of the hot springs on Akutan Island in detail for the first time since the early 1980s. Springs in four discrete groups (A-D) along Hot Springs Creek showed generally higher temperatures and substantially higher Na, Ca, and Cl concentrations than previously reported, and total hot-spring discharge has also increased markedly. The springs now account for a...
Authors
D. Bergfeld, Jennifer L. Lewicki, William C. Evans, Andrew G. Hunt, Kinga Revesz, Mark Huebner
Noble gas geochemistry investigation of high CO2 natural gas at the LaBarge Platform, Wyoming, USA Noble gas geochemistry investigation of high CO2 natural gas at the LaBarge Platform, Wyoming, USA
A regional sampling of gases from thermal springs near the LaBarge Field, Wyoming, USA to determine the extent of the total carbon dioxide system (TCDS) indicates that the system may extend up to 70 km to the northwest of the field. Geochemical evidence from noble gas isotopes, stable element isotopes, and gas composition provide the foundation for these conclusions. Samples from Soda...
Authors
Matthew D. Merrill, Andrew G. Hunt, Celeste D. Lohr
Evidence for high salinity of Early Cretaceous sea water from the Chesapeake Bay crater Evidence for high salinity of Early Cretaceous sea water from the Chesapeake Bay crater
High salinity groundwater more than 1000 metres deep in the Atlantic Coastal Plain of the United States has been documented in several locations1,2, most recently within the 35 million-year-old Chesapeake Bay impact crater3,4,5. Suggestions for the origin of increased salinity in the crater have included evaporite dissolution6, osmosis6, and evaporation from heating7 associated with the...
Authors
Ward E. Sanford, Michael W. Doughten, Tyler B. Coplen, Andrew G. Hunt, Thomas D. Bullen
Groundwater ages and mixing in the Piceance Basin natural gas province, Colorado Groundwater ages and mixing in the Piceance Basin natural gas province, Colorado
Reliably identifying the effects of energy development on groundwater quality can be difficult because baseline assessments of water quality completed before the onset of energy development are rare and because interactions between hydrocarbon reservoirs and aquifers can be complex, involving both natural and human processes. Groundwater age and mixing data can strengthen interpretations...
Authors
Peter B. McMahon, Judith C. Thomas, Andrew G. Hunt
Chemistry and age of groundwater in the Piceance structural basin, Rio Blanco county, Colorado, 2010-12 Chemistry and age of groundwater in the Piceance structural basin, Rio Blanco county, Colorado, 2010-12
Fourteen monitoring wells were sampled by the U.S. Geological Survey, in cooperation with the Bureau of Land Management, to better understand the chemistry and age of groundwater in the Piceance structural basin in Rio Blanco County, Colorado, and how they may relate to the development of underlying natural-gas reservoirs. Natural gas extraction in the area has been ongoing since at...
Authors
Peter B. McMahon, Judith C. Thomas, Andrew G. Hunt
Tracing groundwater with low-level detections of halogenated VOCs in a fractured carbonate-rock aquifer, Leetown Science Center, West Virginia, USA Tracing groundwater with low-level detections of halogenated VOCs in a fractured carbonate-rock aquifer, Leetown Science Center, West Virginia, USA
Measurements of low-level concentrations of halogenated volatile organic compounds (VOCs) and estimates of groundwater age interpreted from 3H/3He and SF6 data have led to an improved understanding of groundwater flow, water sources, and transit times in a karstic, fractured, carbonate-rock aquifer at the Leetown Science Center (LSC), West Virginia. The sum of the concentrations of a set...
Authors
Niel Plummer, Philip L. Sibrell, Gerolamo C. Casile, Eurybiades Busenberg, Andrew G. Hunt, Peter Schlosser
Science and Products
Filter Total Items: 66
Geochemical investigation of the hydrothermal system on Akutan Island, Alaska, July 2012 Geochemical investigation of the hydrothermal system on Akutan Island, Alaska, July 2012
We have studied the geochemistry of the hot springs on Akutan Island in detail for the first time since the early 1980s. Springs in four discrete groups (A-D) along Hot Springs Creek showed generally higher temperatures and substantially higher Na, Ca, and Cl concentrations than previously reported, and total hot-spring discharge has also increased markedly. The springs now account for a...
Authors
D. Bergfeld, Jennifer L. Lewicki, William C. Evans, Andrew G. Hunt, Kinga Revesz, Mark Huebner
Noble gas geochemistry investigation of high CO2 natural gas at the LaBarge Platform, Wyoming, USA Noble gas geochemistry investigation of high CO2 natural gas at the LaBarge Platform, Wyoming, USA
A regional sampling of gases from thermal springs near the LaBarge Field, Wyoming, USA to determine the extent of the total carbon dioxide system (TCDS) indicates that the system may extend up to 70 km to the northwest of the field. Geochemical evidence from noble gas isotopes, stable element isotopes, and gas composition provide the foundation for these conclusions. Samples from Soda...
Authors
Matthew D. Merrill, Andrew G. Hunt, Celeste D. Lohr
Evidence for high salinity of Early Cretaceous sea water from the Chesapeake Bay crater Evidence for high salinity of Early Cretaceous sea water from the Chesapeake Bay crater
High salinity groundwater more than 1000 metres deep in the Atlantic Coastal Plain of the United States has been documented in several locations1,2, most recently within the 35 million-year-old Chesapeake Bay impact crater3,4,5. Suggestions for the origin of increased salinity in the crater have included evaporite dissolution6, osmosis6, and evaporation from heating7 associated with the...
Authors
Ward E. Sanford, Michael W. Doughten, Tyler B. Coplen, Andrew G. Hunt, Thomas D. Bullen
Groundwater ages and mixing in the Piceance Basin natural gas province, Colorado Groundwater ages and mixing in the Piceance Basin natural gas province, Colorado
Reliably identifying the effects of energy development on groundwater quality can be difficult because baseline assessments of water quality completed before the onset of energy development are rare and because interactions between hydrocarbon reservoirs and aquifers can be complex, involving both natural and human processes. Groundwater age and mixing data can strengthen interpretations...
Authors
Peter B. McMahon, Judith C. Thomas, Andrew G. Hunt
Chemistry and age of groundwater in the Piceance structural basin, Rio Blanco county, Colorado, 2010-12 Chemistry and age of groundwater in the Piceance structural basin, Rio Blanco county, Colorado, 2010-12
Fourteen monitoring wells were sampled by the U.S. Geological Survey, in cooperation with the Bureau of Land Management, to better understand the chemistry and age of groundwater in the Piceance structural basin in Rio Blanco County, Colorado, and how they may relate to the development of underlying natural-gas reservoirs. Natural gas extraction in the area has been ongoing since at...
Authors
Peter B. McMahon, Judith C. Thomas, Andrew G. Hunt
Tracing groundwater with low-level detections of halogenated VOCs in a fractured carbonate-rock aquifer, Leetown Science Center, West Virginia, USA Tracing groundwater with low-level detections of halogenated VOCs in a fractured carbonate-rock aquifer, Leetown Science Center, West Virginia, USA
Measurements of low-level concentrations of halogenated volatile organic compounds (VOCs) and estimates of groundwater age interpreted from 3H/3He and SF6 data have led to an improved understanding of groundwater flow, water sources, and transit times in a karstic, fractured, carbonate-rock aquifer at the Leetown Science Center (LSC), West Virginia. The sum of the concentrations of a set...
Authors
Niel Plummer, Philip L. Sibrell, Gerolamo C. Casile, Eurybiades Busenberg, Andrew G. Hunt, Peter Schlosser