Publications
Products (journal articles, reports, fact sheets) authored by current and past scientists are listed below. Please check the USGS Pubs Warehouse for other USGS publications.
Filter Total Items: 2018
Tectonic and metallogenic model for northeast Asia, Chapter 9 in Metallogenesis and tectonics of northeast Asia Tectonic and metallogenic model for northeast Asia, Chapter 9 in Metallogenesis and tectonics of northeast Asia
The major purposes of this chapter are to provide (1) an overview of the regional geology, tectonics, and metallogenesis of Northeast Asia for readers who are unfamiliar with the region, (2) a general scientific introduction to the succeeding chapters of this volume, and (3) an overview of the methodology of metallogenic and tectonic analysis used in this study. We also describe how a...
Authors
Leonid M. Parfenov, Nikolai A. Berzin, Gombosuren Badarch, Valentina G. Belichenko, Alexander N. Bulgatov, Sergey I. Dril, Alexander I. Khanchuk, Galina L. Kirillova, Mikhail I. Kuz'min, Warren J. Nokleberg, Masatsugu Ogasawara, Alexander A. Obolenskiy, Andrei V. Prokopiev, Sergey M. Rodionov, Christopher R. Scotese, Vladimir F. Timofeev, Onongyn Tomurtogoo, Hongquan Yan
Middle Jurassic through Quaternary metallogenesis and tectonics of northeast Asia, Chapter 8 in Metallogenesis and tectonics of northeast Asia Middle Jurassic through Quaternary metallogenesis and tectonics of northeast Asia, Chapter 8 in Metallogenesis and tectonics of northeast Asia
The major purposes of this chapter are to provide (1) an overview of the regional geology, tectonics, and metallogenesis of Northeast Asia for readers who are unfamiliar with the region, (2) a general scientific introduction to the succeeding chapters of this volume, and (3) an overview of the methodology of metallogenic and tectonic analysis used in this study. We also describe how a...
Authors
Sergey M. Rodionov, Alexander I. Khanchuk, Alexander A. Obolenskiy, Masatsugu Ogasawara, Zhan V. Seminskiy, Andrei V. Prokopiev, Vladimir F. Timofeev, Warren J. Nokleberg
Methodology of a combined regional metallogenic and tectonic analysis for northeast Asia, Chapter 2 in Metallogenesis and tectonics of northeast Asia Methodology of a combined regional metallogenic and tectonic analysis for northeast Asia, Chapter 2 in Metallogenesis and tectonics of northeast Asia
The major purposes of this chapter are to provide (1) an overview of the regional geology, tectonics, and metallogenesis of Northeast Asia for readers who are unfamiliar with the region, (2) a general scientific introduction to the succeeding chapters of this volume, and (3) an overview of the methodology of metallogenic and tectonic analysis used in this study. We also describe how a...
Authors
Warren J. Nokleberg, Thomas K. Bundtzen, Kenneth M. Dawson, Roman A. Eremin, Nikolai A. Goryachev, Alexander I. Khanchuk, James W.H. Monger, Alexander A. Obolenskiy, Leonid M. Parfenov, Andrei V. Prokopiev, Vladimir V. Ratkin, Sergey M. Rodionov, Vladimir I. Shpikerman
High-Frequency, Crosswell Radar Data Collected in a Laboratory Tank High-Frequency, Crosswell Radar Data Collected in a Laboratory Tank
Crosswell radar data were collected among three wells in a laboratory tank filled with dry sand. Embedded within the sand was a long plastic box, which was the target for the data collection. Two datasets were collected between each pair of wells, making a total of six datasets. The frequencies in the data ranged from 0.5 to 1.5 gigahertz, and the peak frequency was 0.9 gigahertz. The...
Authors
Bas Peters, Craig W. Moulton, Karl J. Ellefsen, Robert Horton, Jason R. McKenna
To reactivate or not to reactivate: nature and varied behavior of structural inheritance in the Proterozoic basement of the Eastern Colorado mineral belt over 1.7 billion years of earth history To reactivate or not to reactivate: nature and varied behavior of structural inheritance in the Proterozoic basement of the Eastern Colorado mineral belt over 1.7 billion years of earth history
The eastern central Front Range of the Rocky Mountains in Colorado has long been a region of geologic interest because of Laramide-age hydrothermal polymetallic vein-related ores. The region is characterized by a well-exposed array of geologic structures associated with ductile and brittle deformation, which record crustal strain over 1.7 billion years of continental growth and evolution...
Authors
Jonathan S. Caine, John Ridley, Zachary R. Wessel
Frequency domain, waveform inversion of laboratory crosswell radar data Frequency domain, waveform inversion of laboratory crosswell radar data
A new waveform inversion for crosswell radar is formulated in the frequency-domain for a 2.5D model. The inversion simulates radar waves using the vector Helmholtz equation for electromagnetic waves. The objective function is minimized using a backpropagation method suitable for a 2.5D model. The inversion is tested by processing crosswell radar data collected in a laboratory tank. The...
Authors
Karl J. Ellefsen, Aldo T. Mazzella, Robert Horton, Jason R. McKenna
Estimating structural dip from gravity and magnetic profile data Estimating structural dip from gravity and magnetic profile data
The anomalies of ideal sources, dipping magnetic contacts and dipping density sheets, provide the theoretical basis for estimating structural dip from gravity and magnetic profile data. The dip is always related to the local phase angle of a complex analytic signal evaluated directly over the source. For magnetic sheets, the complex analytic signal is constructed from the anomaly and its...
Authors
Jeffrey Phillips
Development of assessment methodologies in support of USGS integrated science-Wyoming Landscape Conservation Initiative Development of assessment methodologies in support of USGS integrated science-Wyoming Landscape Conservation Initiative
No abstract available.
Authors
Robert R. McDougal, JoAnn M. Holloway, Travis S. Schmidt, L.L. Stillings, L.W. Tuttle, S.W. Blecker
Introduction to the JEEG Agricultural Geophysics Special Issue Introduction to the JEEG Agricultural Geophysics Special Issue
Near-surface geophysical methods have become increasingly important tools in applied agricultural practices and studies. The great advantage of geophysical methods is their potential rapidity, low cost, and spatial continuity when compared to more traditional methods of assessing agricultural land, such as sample collection and laboratory analysis. Agricultural geophysics investigations...
Authors
Barry J. Allred, Bruce D. Smith
Formation of the Wiesloch Mississippi Valley-type Zn-Pb-Ag deposit in the extensional setting of the Upper Rhinegraben, SW Germany Formation of the Wiesloch Mississippi Valley-type Zn-Pb-Ag deposit in the extensional setting of the Upper Rhinegraben, SW Germany
The Mississippi Valley-type (MVT) Zn–Pb–Ag deposit in the Wiesloch area, Southwest Germany, is controlled by graben-related faults of the Upper Rhinegraben. Mineralization occurs as vein fillings and irregular replacement ore bodies consisting of sphalerite, banded sphalerite, galena, pyrite, sulfosalts (jordanite and geocronite), barite, and calcite in the Middle Triassic carbonate host...
Authors
Katharina Pfaff, Ludwig H. Hildebrandt, David L. Leach, Dorrit E. Jacob, Gregor Markl
A review of silver-rich mineral deposits and their metallogeny A review of silver-rich mineral deposits and their metallogeny
Mineral deposits with large inventories or high grades of silver are found in four genetic groups: (1) volcanogenic massive sulfide (VMS), (2) sedimentary exhalative (SEDEX), (3) lithogene, and, (4) magmatichydrothermal. Principal differences between the four groups relate to source rocks and regions, metal associations, process and timing of mineralization, and tectonic setting. These...
Authors
Frederick Graybeal, Peter G. Vikre
Calibration and filtering strategies for frequency domain electromagnetic data Calibration and filtering strategies for frequency domain electromagnetic data
echniques for processing frequency-domain electromagnetic (FDEM) data that address systematic instrument errors and random noise are presented, improving the ability to invert these data for meaningful earth models that can be quantitatively interpreted. A least-squares calibration method, originally developed for airborne electromagnetic datasets, is implemented for a ground-based...
Authors
Burke J. Minsley, Bruce D. Smith, Richard Hammack, James I. Sams, Garret Veloski