Publications
Publications from the staff of the Geology, Minerals, Energy, and Geophysics Science Center
Filter Total Items: 2354
Trails through time: A geologist's guide to Jefferson County open space parks
Introduction
Jefferson County straddles one of the most conspicuous and important geographic and geologic boundaries in westernNorth America, the eastern flank of the Rocky Mountains. To the east you can travel 1,100 miles across Great Plains andCentral Lowlands before you sight the western foothills of the Appalachians. If you travel in the other direction you willcross or skirt mountain range af
Authors
John C. Reed
Digital data from the Great Sand Dunes airborne gravity gradient survey, south-central Colorado
This report contains digital data and supporting explanatory files describing data types, data formats, and survey procedures for a high-resolution airborne gravity gradient (AGG) survey at Great Sand Dunes National Park, Alamosa and Saguache Counties, south-central Colorado. In the San Luis Valley, the Great Sand Dunes survey covers a large part of Great Sand Dunes National Park and Preserve. The
Authors
B. J. Drenth, J.D. Abraham, V. J. S. Grauch, V.F. Labson, G. Hodges
Bedrock and surficial geologic map of the Satan Butte and Greasewood 7.5’ quadrangles, Navajo and Apache Counties, northern Arizona
The geologic map of the Satan Butte and Greasewood 7.5’ quadrangles is the result of a cooperative effort of the U.S. Geological Survey (USGS) and the Navajo Nation to provide regional geologic information for management and planning officials. This map provides geologic information useful for range management, plant and animal studies, flood control, water resource investigations, and natural haz
Authors
Lee Amoroso, Susan S. Priest, Margaret Hiza-Redsteer
Status of a reconnaissance field study of the Susitna basin, 2011
The Alaska Division of Geological & Geophysical Surveys (DGGS) and Alaska Division of Oil and Gas
(DOG), in collaboration with the U.S. Geological Survey (USGS) performed reconnaissance field studies for ten
days in late June 2011, in the Susitna basin, directly north of Cook Inlet, south-central Alaska (fig. 1). The purpose
of our investigation was to reconnoiter outcrops in the basin and along i
Authors
Robert J. Gillis, Richard G. Stanley, David L. LePain, David J. Mauel, Trystan M. Herriott, Kenneth P. Helmold, C. Shaun Peterson, Marwan A. Wartes, Diane P. Shellenbaum
Investigating the potential impact of efflorescent mineral crusts on water quality: complementing analytical techniques with geochemical modelling
Efflorescent crusts are a common feature forming on the surface of gold mining sites
and tailings storage facilities during the dry season. Their dissolution at the start of the wet sea-
son releases an acidic pulse of water rich in metal pollutants. The composition of the crusts is
indicative of the water from which they precipitated. This study aimed at assessing the crust
formation and dissolut
Authors
Bronwyn Camden-Smith, Raymond H. Johnson, Robert Richardson, David Billing, Hlanganani Tutu
Reactive transport modeling at uranium in situ recovery sites: uncertainties in uranium sorption on iron hydroxides
Geochemical changes that can occur down gradient from uranium in situ recovery (ISR) sites are important for various stakeholders to understand when evaluating potential effects on surrounding groundwater quality. If down gradient solid-phase material consists of sandstone with iron hydroxide coatings (no pyrite or organic carbon), sorption of uranium on iron hydroxides can control uranium mobilit
Authors
Raymond H. Johnson, Hlanganani Tutu
Expression of terrain and surface geology in high-resolution helicopter-borne gravity gradient (AGG) data: examples from Great Sand Dunes National Park, Rio Grande Rift, Colorado
Airborne gravity gradient (AGG) data are rapidly becoming standard components of geophysical mapping programs, due to their advantages in cost, access, and resolution advantages over measurements of the gravity field on the ground. Unlike conventional techniques that measure the gravity field, AGG methods measure derivatives of the gravity field. This means that effects of terrain and near-surface
Authors
Benjamin J. Drenth
Geologic framework and petroleum systems of Cook Inlet basin, south-central Alaska
This report provides a comprehensive overview of the stratigraphy, structure, tectonics, and petroleum systems of the Cook Inlet basin, an important oil- and gas-producing region in south-central Alaska.
Authors
D. L. LePain, Richard G. Stanley, K. P. Helmold, D.P. Shellenbaum
Eocene extension in Idaho generated massive sediment floods into Franciscan trench and into Tyee, Great Valley, and Green River basins
The Franciscan Complex accretionary prism was assembled during an ∼165-m.y.-long period of subduction of Pacific Ocean plates beneath the western margin of the North American plate. In such fossil subduction complexes, it is generally difficult to reconstruct details of the accretion of continent-derived sediments and to evaluate the factors that controlled accretion. New detrital zircon U-Pb ages
Authors
Trevor A. Dumitru, W. G. Ernst, James E. Wright, Joseph L. Wooden, Ray E. Wells, Lucia P. Farmer, Adam J. R. Kent, Stephan A. Graham
Preliminary isostatic residual gravity map of the Newfoundland Mountains 30' by 60' quadrangle and east part of the Wells 30' by 60' quadrangle, Box Elder County, Utah
A new isostatic residual gravity map of the Newfoundland Mountains and east of the Wells 30×60 quadrangles of Utah is based on compilation of preexisting data and new data collected by the Utah and U.S. Geological Surveys. Pronounced gravity lows occur over Grouse Creek Valley and locally beneath the Great Salt Lake Desert, indicating significant thickness of low-density Tertiary sedimentary rocks
Authors
Victoria E. Langenheim, N. D. Athens, B. A. Churchel, H. Willis, N.E. Knepprath, Jose J. Rosario, J. Roza, S.M. Kraushaar, C.L. Hardwick
Preliminary isostatic gravity map of the Grouse Creek and east part of the Jackpot 30 by 60 quadrangles, Box Elder County, Utah, and Cassia County, Idaho
A new isostatic residual gravity map of the northwest corner of Utah is based on compilation of preexisting data and new data collected by the Utah and United States Geological Surveys. Pronounced gravity lows occur over Junction, Grouse Creek, and upper Raft River Valleys, indicating significant thickness of low-density Tertiary sedimentary rocks and deposits. Gravity highs coincide with exposure
Authors
Victoria E. Langenheim, H. Willis, N. D. Athens, Bruce A. Chuchel, J. Roza, H.I. Hiscock, C.L. Hardwick, S.M. Kraushaar, N.E. Knepprath, Jose J. Rosario
ULFEM time series analysis package
This manual describes how to use the Ultra-Low-Frequency ElectroMagnetic (ULFEM) software package. Casual users can read the quick-start guide and will probably not need any more information than this. For users who may wish to modify the code, we provide further description of the routines.
Authors
Susan M. Karl, Darcy McPhee, Jonathan M. G. Glen, Simon L. Klemperer