Publications
Publications from the staff of the Geology, Minerals, Energy, and Geophysics Science Center
Filter Total Items: 2354
Apatite trace element geochemistry and cathodoluminescent textures—Acomparison between regional magmatism and the Pea Ridge IOA-REE andBoss IOCG deposits, southeastern Missouri iron metallogenic province, USA
The southeast Missouri iron metallogenic province contains a remarkable wealth of historically important Fe, Cu, Au, and rare earth element (REE) deposits including the Pea Ridge iron oxide-apatite-rare earth element (IOA-REE) deposit and the Boss iron oxide-copper-gold (IOCG) deposit. These deposits are coeval with silicic and intermediate composition magmatism in the St. Francois Mountains terra
Authors
Celestine N. Mercer, Kathryn E. Watts, Juliane Gross
Detection of rock bridges by infrared thermal imaging and modeling
Characterization of rock discontinuities and rock bridges is required to define stability conditions of fractured rock masses in both natural and engineered environments. Although remote sensing methods for mapping discontinuities have improved in recent years, remote detection of intact rock bridges on cliff faces remains challenging, with their existence typically confirmed only after failure. I
Authors
Antoine Guerin, Michel Jaboyefoff, Brian D. Collins, Marc-Henri Derron, Greg M. Stock, Battista Matasci, Martin Boesiger, Caroline Lefeuvre, Yury Y. Podladchikov
On the portability of ML-MC as a depth discriminant for small seismic events recorded at local distances
In this paper we show that ML-MC is a viable and regionally portable depth discriminant and therefore may contribute in nuclear test ban treaty verification. A recent study found that the difference between local magnitude (ML) and coda duration magnitude (MC) discriminates shallow seismic events (mining blasts, mining-induced earthquakes, and shallow tectonic earthquakes) from deeper tectonic ear
Authors
Monique M. Holt, Keith D. Koper, William L. Yeck, Sebastiano D’Amico, Zongshan Li, J. Mark Hale, Relu Burlacu
Gravity surveys using a mobile atom interferometer
Mobile gravimetry is important in metrology, navigation, geodesy, and geophysics. Atomic gravimeters could be among the most accurate mobile gravimeters, but are currently constrained by being complex and fragile. Here, we demonstrate a mobile atomic gravimeter, measuring tidal gravity variations in the laboratory as well as surveying gravity in the field. The tidal gravity measurements achieve a
Authors
Xuejian Wu, Zachary Pagel, Bola S. Malek, Timothy H. Nguyen, Fei Zi, Daniel Scheirer, Holger Muller
A river is born: Highlights of the geologic evolution of the Colorado River extensional corridor and its river: A field guide honoring the life and legacy of Warren Hamilton
The Colorado River extensional corridor, which stretched by a factor of 2 in the Miocene, left a series of lowland basins and intervening bedrock ranges that, at the dawn of the Pliocene, were flooded by Colorado River water newly diverted from the Colorado Plateau through Grand Canyon. This water and subsequent sediment gave birth, through a series of overflowing lakes, to an integrated Colorado
Authors
Keith A. Howard, Kyle House, Barbara E John, Ryan S. Crow, Philip A Pearthree
Mesozoic to Cenozoic sedimentation, tectonics, and metallogeny of Sonora, Mexico
We will embark on a five-day journey through northern, western, and central
Sonora, in which we will see excellent examples of mostly Mesozoic to Cenozoic tectonics,
sedimentation, and metallogeny. On Day 1, we will visit the porphyry copper
deposit at Ajo, Arizona, and several Pleistocene cinder cones and maar craters in
the Pinacate Biosphere Reserve. On Day 2, we will see L- and L-S tectonites
Authors
Jason Price, Thierry Calmus, S. Bennett, Lucas Ochoa-Landín
Porphyry copper potential of the U.S. Southern Basin and Range using ASTER data integrated with geochemical and geologic datasets to assess potential near-surface deposits in well-explored permissive tracts
ArcGIS was used to spatially assess and rank potential porphyry copper deposits using Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) data together with geochemical and geologic datasets in order to estimate undiscovered deposits in the southern Basin and Range Province in the southwestern United States. The assessment was done using a traditional expert opinion three-part m
Authors
John C. Mars, Gilpin R. Robinson,, Jane M. Hammarstrom, Lukas Zürcher, Helen A. Whitney, Federico Solano, Mark E. Gettings, Stephen Ludington
One hundred and sixty years of Grand Canyon geological mapping
No abstract available.
Authors
Karl Karlstrom, Laura Crossey, Peter W. Huntoon, George Billingsley, Michael Timmons, Ryan S. Crow
Radiocarbon and geologic evidence reveal Ilopango volcano as source of the colossal 'mystery' eruption of 539/40 CE
Ilopango volcano (El Salvador) erupted violently during the Maya Classic Period (250–900 CE) in a densely-populated and intensively-cultivated region of the southern Maya realm, causing regional abandonment of an area covering more than 20,000 km2. However, neither the regional nor global impacts of the Tierra Blanca Joven (TBJ) eruption in Mesoamerica have been well appraised due to limitations i
Authors
Robert A. Dull, John R. Southon, Steffen Kutterolf, Kevin J. Anchukaitis, Armin Freundt, David Wahl, Payson Sheets, Paul Amaroli, Walter Hernandez, Micheal C. Weimann, Clive Oppenheimer
Occurrence and sources of radium in groundwater associated with oil fields in the southern San Joaquin Valley, California
Geochemical data from 40 water wells were used to examine the occurrence and sources of radium (Ra) in groundwater associated with three oil fields in California (Fruitvale, Lost Hills, South Belridge). 226Ra+228Ra activities (range=0.010-0.51 Bq/L) exceeded the 0.185 Bq/L drinking-water standard in 18% of the wells (not drinking-water wells). Radium activities were correlated with TDS concentrati
Authors
Peter B. McMahon, Avner Vengosh, Tracy Davis, Matthew K. Landon, Rebecca L. Tyne, Michael Wright, Justin T. Kulongoski, Andrew G. Hunt, Peter H. Barry, A.J. Kondash, Z. Wang, Christopher J. Ballentine
An initial assessment of areas where landslides could enter the West Arm of Glacier Bay, Alaska and implications for tsunami hazards
Tsunamis generated by landslides in Glacier Bay are uncommon, but have potential to be extraordinarily destructive when they occur. This article identifies areas that are susceptible to landslides that could generate tsunamis and discusses approaches to characterize hazard and risk from these events.
Authors
Jeffrey A. Coe, Robert G. Schmitt, Erin Bessette-Kirton
Paleoenvironmental, epigraphic, and archaeological evidence of total warfare among the Classic Maya
Despite over a century of archaeological research, the nature and broader consequences of Classic Maya warfare remain poorly understood. Based on frequent epigraphic references and iconographic themes, Classic period (250-950 CE) Maya warfare has largely been viewed as ritualized and limited in scope. Evidence of warfare in the Terminal Classic period (TCP, 800-950 CE) is interpreted as an escalat
Authors
David Wahl, Lysanna Anderson, Francisco Estrada-Belli, Alexandre Tokovinine