Publications
Publications from the staff of the Geology, Minerals, Energy, and Geophysics Science Center
Filter Total Items: 2536
Noble and base metal distribution and processes affecting ore tenors in the disrupted lower stratigraphy of the Stillwater Complex, USA Noble and base metal distribution and processes affecting ore tenors in the disrupted lower stratigraphy of the Stillwater Complex, USA
Exploration continues for contact-style Ni-Cu sulfide and chromitite-associated PGE mineralization in ultramafic rocks of the Stillwater Complex. At the Iron and Chrome Mountain areas, massive sulfides occur along the complex’s footwall contact and anomalous concentrations of PGE+Au are associated with the three lowermost chromitite seams. Southeast of Chrome Mountain, magmatic layering...
Authors
Allen K. Andersen, Michael Jenkins
Estimation of the accessible and useful resource base for electric-grade enhanced geothermal systems (EGS) resources of the Great Basin, USA Estimation of the accessible and useful resource base for electric-grade enhanced geothermal systems (EGS) resources of the Great Basin, USA
Scientists with the U.S. Geological Survey (USGS) recently completed a provisional assessment of the electric-grade geothermal resources associated with the low-permeability geologic formations of the Great Basin, USA, where resources are assumed to be accessible using enhanced geothermal systems (EGS) technologies (i.e., the engineering of sufficient permeability to facilitate efficient...
Authors
Erick R. Burns, Luke P. Frash, Colin F. Williams
Preventing overfitting when using tree-based methods for mapping hydrothermal favorability Preventing overfitting when using tree-based methods for mapping hydrothermal favorability
Ensemble tree-based algorithms are robust tools for estimating sparsely distributed resources with non-linear dependencies (e.g., hydrothermal systems). These algorithms naturally accommodate the threshold conditions necessary to enable and support hydrothermal systems (e.g., having sufficient heat and permeability) and are simpler than many other non-linear machine learning strategies...
Authors
Stanley Paul Mordensky, Erick R. Burns, John Lipor, Jacob DeAngelo
Structural controls on splay fault rupture dynamics during Cascadia megathrust earthquakes Structural controls on splay fault rupture dynamics during Cascadia megathrust earthquakes
Great subduction earthquakes (Mw ≥ 8.0) can generate devastating tsunamis by rapidly displacing the seafloor and overlying water column. These potentially tsunamigenic seafloor offsets result from coseismic fault slip and deformation beneath or within the accretionary wedge. The mechanics of these shallow rupture phenomena and their dependence on subduction zone properties remain...
Authors
James Burkhardt Biemiller, Alice-Agnes Gabriel, Lydia M. Staisch, Thomas Ulrich, Audrey M. Dunham, Erin A. Wirth, Janet Watt, Madeleine C. Lucas, Anna Ledeczi
Assessment of coastal and fluvial morphodynamic changes using Structure-for-Motion: A case study of the Sfȃntu Gheorghe Mouth (Danube Delta, Romania) Assessment of coastal and fluvial morphodynamic changes using Structure-for-Motion: A case study of the Sfȃntu Gheorghe Mouth (Danube Delta, Romania)
The ability to accurately map erosion, flooding, and habitat loss in coastal environments is crucial for formulating national strategies aimed at preventing and mitigating the impacts of natural disasters. A fundamental component of this process is the implementation of coastal morphodynamics monitoring through Structure-from-Motion (SfM) techniques, utilizing high-resolution 2D/3D data...
Authors
Andrei Gabriel Dragos, Gabriel Iordache, Florin Dutu, Monica Palaseanu-Lovejoy, Florin Pitea, Irina Stanciu, Adrian Stanica
The Mammoth magnetic anomaly, Pinal County, Arizona The Mammoth magnetic anomaly, Pinal County, Arizona
A high-resolution Earth Mapping Resources Initiative airborne geophysical survey was flown in the southwest North American porphyry copper province to improve bedrock geologic maps and to identify areas that have unrecognized critical mineral resource potential. During the review of the aeromagnetic data, a distinctly monopolar-shaped, negative magnetic anomaly was observed at a flight...
Authors
Callum Andrew Walter, Daniel S. Scheirer, Carl Joseph Beno, Jackson Stone Borchardt, Dylan Mark Connell
Relationship of basin structure and bedrock lithology to faulting in the 2019 Ridgecrest earthquake region, California, from gravity and aeromagnetic data Relationship of basin structure and bedrock lithology to faulting in the 2019 Ridgecrest earthquake region, California, from gravity and aeromagnetic data
We investigate patterns of cumulative offsets on the faults that ruptured in 2019 and along the Garlock Fault in the Ridgecrest region, California using recently published gravity and aeromagnetic data. We also examine the relationship of basin structure and bedrock structure to the 2019 M7.1 Ridgecrest earthquake ruptures (Fig. 1A), which were primarily along a dextral northwest...
Authors
Victoria Langenheim, Elizabeth Haddon
Rare earth element-mineralized carbonatite in the Bear Lodge Alkaline Complex, USA—Ore genesis implications from fluid inclusion characterization Rare earth element-mineralized carbonatite in the Bear Lodge Alkaline Complex, USA—Ore genesis implications from fluid inclusion characterization
Rare earth element (REE) resources of the Bear Lodge Alkaline Complex, Wyoming, are hosted in variably leached carbonatite spatially related to diatreme breccia pipes. We investigated the genesis of REE and lesser-known gold resources through fluid inclusion analysis of carbonatite, fluorite breccia, and smoky quartz vein samples. Physicochemical characteristics of inclusion-trapped...
Authors
Allen K. Andersen, Danielle A. Olinger, Mitchell M. Bennett
Guidelines for producing integrated 210Pb and 14C age-models Guidelines for producing integrated 210Pb and 14C age-models
Accurate reconstructions of past environmental changes are crucial in paleoecological research and require reliable chronologies of sedimentary archives. Establishing robust age-models and obtaining the most appropriate proxies for analysis is a complex scientific endeavor, requiring extensive resources and collaboration among specialists, including radiochronologists. Radiometric dating...
Authors
Joan-Albert Sanchez-Cabeza, Marco A. Aquino-López, Maarten Blaauw, Ana Carolina Ruiz-Fernández, Johanna Jupin, Lysanna Anderson, Clarke Alexandra Knight, Marie Rhondelle Champagne, Nicole K. Sanderson, Simon Goring, J. Andrés Christen
VIPER site analysis VIPER site analysis
We needed to evaluate available orbital data of NASA’s Volatiles Investigating Polar Exploration Rover (VIPER) mission area in order to derive a variety of maps to help the science team identify scientifically interesting places for the rover to visit and to provide scientific context for our mission. Some of these maps also fulfilled engineering and mission design needs to enable safe...
Authors
Ross A. Beyer, Mark Shirley, Anthony Colaprete, Caleb I. Fassett, Benjamin Fernando, Tanish P. Himani, Myriam Lemelin, José Martinez-Comacho, Matthew A. Siegler, Andrew M. Annex, Edward Balaban, Valentin T. Bickel, Joshua A. Coyan, Ariel N. Deutsch, Jennifer L. Heldmann, Masatoshi Hirabayashi, Laszlo P. Keszthelyi, Kevin W. Lewis, Darlene S.S. Lim, Eldar Noe Dobrea
Petrogenesis and mineralization potential of spinifex komatiitic basalts in the Bradley Peak greenstone terrane, Wyoming Province Petrogenesis and mineralization potential of spinifex komatiitic basalts in the Bradley Peak greenstone terrane, Wyoming Province
Komatiitic volcanic rocks are important hosts of Ni sulfide mineralization and record early Earth evolution; however, those in the well-studied Archean Wyoming Province have received little attention. Here, we elucidate the timing and petrogenesis of the Bradley Peak komatiitic volcanic rocks using field and textural observations, geochronology, and geochemistry. Detrital and igneous...
Authors
Lisa J. Zieman, Michael Jenkins, Jacob Evan Poletti
A global database of soil microbial phospholipid fatty acids and enzyme activities A global database of soil microbial phospholipid fatty acids and enzyme activities
Soil microbes drive ecosystem function and play a critical role in how ecosystems respond to global change. Research surrounding soil microbial communities has rapidly increased in recent decades, and substantial data relating to phospholipid fatty acids (PLFAs) and potential enzyme activity have been collected and analysed. However, studies have mostly been restricted to local and...
Authors
Laura G. van Galen, Gabriel Reuben Smith, Andrew J. Margenot, Mark P. Waldrop, Thomas W. Crowther, Kabir G. Peay, Robert B. Jackson, Kailiang Yu, Anna Abrahão, Talaat A. Ahmed, Sten Anslan, Mark A. Anthony, Ademir Sergio Ferreira Araujo, Judith Ascher-Jenull, Elizabeth M. Bach, Mohammad Bahram, Christopher C.M. Baker, Petr Baldrian, Richard D. Bardgett, M. Noelia Barrios-Garcia, Felipe Bastida, Francesca Beggi, Liane G. Benning, Luca Bragazza, Arth A.D. Broadbent, Concha Cano-Díaz, Anna M. Cates, Carlos E.P. Cerri, Simone Cesarz, Baodong Chen, Amy T. Classen, Mathilde Borg Dahl, Manuel Delgado-Baquerizo, Nico Eisenhauer, Svetlana Evgrafova, Nicolas Fanin, Flavio Fornasier, Romeu Francisco, Andre L.C. Franco, Serita D. Frey, Hannu Fritze, Carlos García, Pablo García-Palacios, Maria Gómez-Brandón, Marina Gonzalez-Polo, Beatriz Gozalo, Robert Griffiths, Carlos Guerra, Moritz Hallama, Inga Hiiesalu, Hossain, Yajun Hu, Heribert Insam, Vincent E.J. Jassey, Lili Jiang, Ellen Kandeler, Petr Kohout, Urmas Kõljalg, Valentyna Krashevska, Xiaofei Li, Jing-Zhong Lu, Xiankai Lu, Shan Luo, Stefanie Lutz, Kathleen Allison Mackie-Haas, Fernanado T. Maestre, Minna Malmivaara-Lämsä, Kai Mangelsdorf, Maria Manjarrez, Sven Marhan, Ashley Martin, Kelly E. Mason, Jordan Mayor, Rebecca L. McCulley, Mari Moora, Paula V. Morais, Miriam Muñoz-Rojas, Rajasekaran Murugan, Andrew T. Nottingham, Victoria Ochoa, Raul Ochoa-Hueso, Jane Oja, Pål Axel Olsson, Maarja Öpik, Nick Ostle, Krista Peltoniemi, Taina Pennanen, David S. Pescador, G. Kenny Png, Christian Poll, Sergei Põlme, Anton M. Potapov, Anders Priemé, William Pritchard, Jeremy Puissant, Sandra Mara Barbosa Rocha, Christoph Rosinger, Liliane Ruess, Emma J. Sayer, Stefan Scheu, Robert L. Sinsabaugh, Lindsey C. Slaughter, Nadejda A. Soudzilovskaia, Jose Paulo Sousa, Lee Stanish, Shu-ichi Sugiyama, Leho Tedersoo, Pankaj Trivedi, Tanel Vahter, Jana Voriskova, Dirk Wagner, Cong Wang, David A. Wardle, Jeanette Whitaker, Yuanhe Yang, Zhiwei Zhong, Kai Zhu, Lori A. Ziolkowski, Martin Zobel, Johan van den Hoogen