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: 1939
Spread and frequency of explosive silicic volcanism of the Carpathian-Pannonian Region during Early Miocene: Clues from the SW Pannonian Basin and the Dinaridesion during Early Miocene: clues from the SW Pannonian Basin and the Dinarides Spread and frequency of explosive silicic volcanism of the Carpathian-Pannonian Region during Early Miocene: Clues from the SW Pannonian Basin and the Dinaridesion during Early Miocene: clues from the SW Pannonian Basin and the Dinarides
Explosive silicic volcanism of the Carpathian-Pannonian Region (CPR) is increasingly recognized as the primary source of tephra across the Alpine-Mediterranean region during the Early and Middle Miocene. However, the tephrostratigraphic framework for this period of volcanic activity is still incomplete. We present new multi-proxy data from Lower Miocene ignimbrites and tephra fallout...
Authors
Mihovil Brlek, Nina Trinajstic, Sean Patrick Gaynor, Steffen Kutterolf, Folkmar Hauff, Julie Schindlbeck-Belo, Sanja Suica, Kuo-Lung Wang, Hao-Yang Lee, Elena Watts, Svetoslav V. Georgiev, Vlatko Brcic, Marko Spelic, Ivan Misur, Duje Kukoc, Blair Schoene, Reka Lukacs
New occurrences of the rare, REE minerals daqingshanite, törnebohmite, biraite, sahamalite, and ferriperbøeite from the Sheep Creek area, Montana, USA New occurrences of the rare, REE minerals daqingshanite, törnebohmite, biraite, sahamalite, and ferriperbøeite from the Sheep Creek area, Montana, USA
Over 30 small, discontinuous, tabular carbonatite bodies are located in the Sheep Creek area, Ravalli County, southwest Montana. The age and origin of these REE-Nb-rich deposits are currently being investigated. The purpose of this paper is to document the occurrence of several rare minerals, including daqingshanite, törnebohmite, biraite, sahamalite, and ferriperbøeite, in two of the...
Authors
Chris Gammons, Sarah Risedorf, Gary Wyss, Heather A. Lowers
An accuracy assessment of the surface reflectance product from the EMIT imaging spectrometer An accuracy assessment of the surface reflectance product from the EMIT imaging spectrometer
The Earth surface Mineral dust source InvesTigation (EMIT) is an imaging spectrometer launched to the International Space Station in July 2022 to measure the mineral composition of Earth’s dust-producing regions. We present a systematic accuracy assessment of the EMIT surface reflectance product in two parts. First, we characterize the surface reflectance product’s overall performance...
Authors
Red Willow Coleman, David R. Thompson, Philip G. Brodrick, Eyal Ben-Dor, Evan Cox, Carlos Perez Garcıa-Pando, Todd M. Hoefen, Raymond F. Kokaly, John Michael Meyer, Francisco Ochoa, Gregory S. Okin, Daniela Heller Pearlshtien, Gregg A. Swayze, Robert O. Green
Beyond the wedge: Impact of tidal streams on salinization of groundwater in a coastal aquifer stressed by pumping and sea-level rise Beyond the wedge: Impact of tidal streams on salinization of groundwater in a coastal aquifer stressed by pumping and sea-level rise
Saltwater intrusion (SWI) is a well-studied phenomenon that threatens the freshwater supplies of coastal communities around the world. The development and advancement of numerical models has led to improved assessment of the risk of salinization. However, these studies often fail to include the impact of surface waters as potential sources of aquifer salinity and how they may impact SWI...
Authors
Mary C. Hingst, R.M. Housego, C. He, Burke J. Minsley, Lyndsay B. Ball, Holly A. Michael
Adaptation and Response in Drylands (ARID): Community insights for scoping a NASA terrestrial ecology field campaign in drylands Adaptation and Response in Drylands (ARID): Community insights for scoping a NASA terrestrial ecology field campaign in drylands
Dryland ecosystems cover 40% of our planet's land surface, support billions of people, and are responding rapidly to climate and land use change. These expansive systems also dominate core aspects of Earth's climate, storing and exchanging vast amounts of water, carbon, and energy with the atmosphere. Despite their indispensable ecosystem services and high vulnerability to change...
Authors
Andrew F. Feldman, Sasha C. Reed, Cibele Amaral, Alicja Babst-Kostecka, Flurin Babst, Joel A. Biederman, Charles Devine, Zheng Fu, Julia K. Green, Jessica Guo, Niall P. Hanan, Raymond F. Kokaly, Marcy Litvak, Natasha MacBean, David Moore, Dennis S. Ojima, Benjamin Poulter, Russell L. Scott, William K. Smith, Robert Swap, Compton J. Tucker, Lixin Wang, Jennifer D. Watts, Konrad Wessels, Fangyue Zhang, Wen Zhang
Mantle melting in regions of thick continental lithosphere: Examples from Late Cretaceous and younger volcanic rocks, Southern Rocky Mountains, Colorado (USA) Mantle melting in regions of thick continental lithosphere: Examples from Late Cretaceous and younger volcanic rocks, Southern Rocky Mountains, Colorado (USA)
Major- and trace-element data together with Nd and Sr isotopic compositions and 40Ar/39Ar age determinations were obtained for Late Cretaceous and younger volcanic rocks from north-central Colorado, USA, in the Southern Rocky Mountains to assess the sources of mantle-derived melts in a region underlain by thick (≥150 km) continental lithosphere. Trachybasalt to trachyandesite lava flows...
Authors
Lang Farmer, Leah E. Morgan, M. Cosca, James Mize, Treasure Bailey, Kenzie J. Turner, Cameron Mark Mercer, Eric T Ellison, Aaron Bell
Arctic Alaska deepwater organic carbon burial and environmental changes during the late Albian–early Campanian (103–82 Ma) Arctic Alaska deepwater organic carbon burial and environmental changes during the late Albian–early Campanian (103–82 Ma)
The middle Cretaceous greenhouse period experienced profound environmental change including episodes of enhanced global burial of organic carbon marked by carbon isotopic excursions (CIEs). However, the role and response of polar regions like the newly formed, partially enclosed Arctic Ocean Basin during middle Cretaceous carbon burial remains enigmatic. We present the first Arctic...
Authors
Richard O. Lease, Katherine J. Whidden, Julie A. Dumoulin, David W. Houseknecht, Palma J. Botterell, Mark F. Dreier, Neil Patrick Griffis, Roland Mundil, Andrew R.C. Kylander-Clark, Margaret M. Sanders, John W. Counts, Jean Self-Trail, Jared T. Gooley, William A. Rouse, Rebecca A. Smith, Christina A. DeVera
Airborne gamma-ray spectrometry inversion signatures of Hicks Dome area Airborne gamma-ray spectrometry inversion signatures of Hicks Dome area
No abstract available.
Authors
Jessica Weihermann, Yaoguo Li, Anne E. McCafferty
Assessing potential effects of oil and gas development activities on groundwater quality near and overlying the Elk Hills and North Coles Levee Oil Fields, San Joaquin Valley, California Assessing potential effects of oil and gas development activities on groundwater quality near and overlying the Elk Hills and North Coles Levee Oil Fields, San Joaquin Valley, California
Groundwater resources are utilized near areas of intensive oil and gas development in California’s San Joaquin Valley. In this study, we examined chemical and isotopic data to assess if thermogenic gas or saline water from oil producing formations have mixed with groundwater near the Elk Hills and North Coles Levee Oil Fields in the southwestern San Joaquin Valley. Major ion...
Authors
John G. Warden, Matthew K. Landon, Michael J. Stephens, Tracy Davis, Janice M. Gillespie, Peter B. McMahon, Justin T. Kulongoski, Andrew G. Hunt, David H. Shimabukuro, Riley Gannon, Lyndsay B. Ball
A multi-methodological approach: Combining textural observations and geochronology to study the J-M Reef Package and its Hanging Wall, Stillwater Complex, Montana A multi-methodological approach: Combining textural observations and geochronology to study the J-M Reef Package and its Hanging Wall, Stillwater Complex, Montana
No abstract available.
Authors
Michael Jenkins, Sam R. Corson, Ennis Geraghty, S.L. Kamo, Heather A. Lowers, James E. Mungall
Cathodoluminescence imaging and spectrometry of a jadeite microbeam reference crystal: Detection of Ce3+ Cathodoluminescence imaging and spectrometry of a jadeite microbeam reference crystal: Detection of Ce3+
Options for selecting a high Na concentration mineral for instrument calibration that are suitably stable under the electron beam are limited [1]. NaCl (approximately a mass fraction of 39 % Na) is not practical for use alongside other embedded and polished materials in a mounted block of standards. While albite (NaAlSi3O8; approximately a mass fraction of 8 % Na) represents a typical...
Authors
Thomas Lameris, Heather A. Lowers, Scott A. Wight, Edward P. Vicenzi
Correlating quantified cathodoluminescence spectra in jadeite with micro-scale color measurements in visible-near infrared reflectance spectrometry Correlating quantified cathodoluminescence spectra in jadeite with micro-scale color measurements in visible-near infrared reflectance spectrometry
Cultures throughout history have valued jadeite jade (hereinafter jade), a natural material assemblage composed predominately of the NaAl endmember pyroxene, jadeite (NaAlSi2O6) that is prized for its mechanical properties and enticing coloration [1, 2]. The geological setting for the formation of jadeite-rich rocks and associated complex geochemical phenomena is well documented in the...
Authors
Edward P. Vicenzi, Thomas Lameris, Heather A. Lowers, Colin MacRae