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Filter Total Items: 646
Year Published: 2016

Geochemistry of the Black Sea during the last 15 kyr: A protracted evolution of its hydrography and ecology

The Black Sea is a 2200 m deep anoxic, marine sea connected to the Mediterranean Sea via the Dardanelles Strait, Marmara Sea, and the 3 km wide, 35 m deep Bosphorus Strait. The biogeochemistry of sediment from the Anatolia slope has recorded changes to the hydrography leading up to and following the input of Mediterranean water at ~9.4 ka (103 ...

Piper, David Z.
Piper, D.Z., 2016, Geochemistry of the Black Sea during the last 15 kyr; a protracted evolution of its hydrography and ecology: Paleoceanography.

Year Published: 2016

Late Neogene deformation of the Chocolate Mountains Anticlinorium: Implications for deposition of the Bouse Formation and early evolution of the Lower Colorado River

Deformation related to late Neogene dextral shear can explain a shift from an estuarine to lacustrine depositional environment in the southern Bouse Formation north of Yuma, Arizona. We infer that late Neogene deformation in the Chocolate Mountain Anticlinorium (CMA) created a barrier that blocked an estuary inlet, and that pre-existing and...

Beard, Sue; Haxel, Gordon B.; Dorsey, Rebecca J.; McDougall, Kristin A.; Jacobsen, Carl E.

Year Published: 2016

The Provo shoreline of Lake Bonneville: Chapter 7

G.K. Gilbert studied the Bonneville basin 150 years ago and his findings have largely stood the test of time: The Provo shoreline, the most prominent geomorphic feature of Lake Bonneville, reflects threshold-stabilized overflow of the lake after the Bonneville flood and before a drier climate caused the lake to shrink. Subsequent refinements in...

Miller, David
D.M. Miller, The Provo Shoreline of Lake Bonneville, Developments in Earth Surface Processes, Volume 20, 2016, Pages 127-144, ISSN 0928-2025, http://dx.doi.org/10.1016/B978-0-444-63590-7.00007-X.

Year Published: 2016

Spatial database for a global assessment of undiscovered copper resources: Chapter Z in Global mineral resource assessment

As part of the first-ever U.S. Geological Survey global assessment of undiscovered copper resources, data common to several regional spatial databases published by the U.S. Geological Survey, including one report from Finland and one from Greenland, were standardized, updated, and compiled into a global copper resource database. This integrated...

Zientek, Michael L.; Hammarstrom, Jane M.; Johnson, Kathleen M.; Dicken, Connie L.; Dunlap, Pamela; Parks, Heather L.; Hammarstrom, Jane M.; Zientek, Michael L.
Dicken, C.L., Dunlap, Pamela, Parks, H.L., Hammarstrom, J.M., and Zientek, M.L., 2016, Spatial database for a global assessment of undiscovered copper resources: U.S. Geological Survey Scientific Investigations Report 2010–5090–Z, 29 p., and GIS data, available at http://dx.doi.org/10.3133/sir20105090Z.

Year Published: 2016

Aeromagnetic map of northwest Utah and adjacent parts of Nevada and Idaho

Two aeromagnetic surveys were flown to promote further understanding of the geology and structure in northwest Utah and adjacent parts of Nevada and Idaho by serving as a basis for geophysical interpretations and by supporting geological mapping, water and mineral resource investigations, and other topical studies. Although this area is in general...

Langenheim, Victoria

Year Published: 2016

GIS methodology for geothermal play fairway analysis: Example from the Snake River Plain volcanic province

Play fairway analysis in geothermal exploration derives from a systematic methodology originally developed within the petroleum industry and is based on a geologic and hydrologic framework of identified geothermal systems. We are tailoring this methodology to study the geothermal resource potential of the Snake River Plain and surrounding region....

DeAngelo, Jacob; Shervais, John W.; Glen, Jonathan; Nielson, Dennis L.; Garg, Sabodh; Dobson, Patrick; Gasperikova, Erika; Sonnenthal, Eric; Visser, Charles; Liberty, Lee M.; Siler, Drew; Evans, James P.; Santellanes, Sean

Year Published: 2016

Hyperspectral surveying for mineral resources in Alaska

Alaska is a major producer of base and precious metals and has a high potential for additional undiscovered mineral resources. However, discovery is hindered by Alaska’s vast size, remoteness, and rugged terrain. New methods are needed to overcome these obstacles in order to fully evaluate Alaska’s geology and mineral resource...

Kokaly, Raymond F.; Graham, Garth E.; Hoefen, Todd M.; Kelley, Karen D.; Johnson, Michaela R.; Hubbard, Bernard E.
Kokaly, R.F., Graham, G.E., Hoefen, T.M., Kelley, K.D., Johnson, M.R., and Hubbard, B.E., Hyperspectral surveying for mineral resources in Alaska: U.S. Geological Survey Fact Sheet 2016-3029, 2 p., http://dx.doi.org/10.3133/fs20163029.

Year Published: 2016

The Pilot Valley shoreline: An early record of Lake Bonneville dynamics: Chapter 3

The Pilot Valley shoreline is named for distinctive gravel beaches on the eastern, northern, and western sides of Pilot Valley playa, Utah. The shoreline has been identified across the Bonneville basin where it is characterized by one to three beach crests between ~ 1305 and 1309 m elevation, all overlain by deep-water marl of Lake...

Miller, David; Phelps, Geoffrey

Year Published: 2016

Accretionary lapilli: what’s holding them together?

Accretionary lapilli from Tagus cone, Isla Isabela, Galápagos were analyzed using scanning electron microscope (SEM) and energy-dispersive X-ray spectroscopy (EDS) techniques. Our main findings are (1) the lapilli formed and hardened in a few minutes while still aloft in the dispersing eruption column. (2) Palagonite rinds developed first...

Adams, Paul M.; Lynch, David K.; Buesch, David C.
Adams, P.M., Lynch, D.K., and Buesch, D.C., 2016, Accretionary lapilli: what’s holding them together? in Reynolds, R.E., ed, “Going LOCO: Investigations along the Lower Colorado River”, California State University Desert Studies Consortium, p. 256-265.

Year Published: 2016

Architecture, geochemistry, and paleomagnetic directions of the 5.42 Ma Broadwell Mesa basalt volcanic field, Bristol Mountains, California

No abstract available.

Buesch, David C.; Phelps, Geoffrey
Buesch, D.C., and Phelps, G.A., 2016, Architecture, geochemistry, and paleomagnetic directions of the 5.42 Ma Broadwell Mesa basalt volcanic field, Bristol Mountains, California: in Reynolds, R.E., ed, “Going LOCO: Investigations along the Lower Colorado River”, California State University Desert Studies Consortium, p. 253-255.

Year Published: 2016

Contemporary deformation in the Yakima fold and thrust belt estimated with GPS

Geodetic, geologic and palaeomagnetic data reveal that Oregon (western USA) rotates clockwise at 0.3 to 1.0° Ma−1 (relative to North America) about an axis near the Idaho–Oregon–Washington border, while northeast Washington is relatively fixed. This rotation has been going on for at least 15 Ma. The Yakima fold and thrust belt (YFTB) forms the...

McCaffrey, Robert; King, Robert W.; Wells, Ray; Lancaster, Matthew; Miller, M. Meghan

Year Published: 2016

Isotopically constrained lead sources in fugitive dust from unsurfaced roads in the southeast Missouri mining district

The isotopic composition of lead (Pb) in fugitive dust suspended by a vehicle from 13 unsurfaced roads in Missouri was measured to identify the source of Pb within an established long-term mining area. A three end-member model using 207Pb/206Pb and concentration as tracers resulted in fugitive dust samples plotting in the mixing field of well...

Witt, Emitt C.; Pribil, Michael; Hogan, John P; Wronkiewicz, David

Filter Total Items: 135
Image shows a scanning electron microscope image of finchite
December 31, 2015

Scanning Electron Microscope Image of Finchite

A scanning electron microscope image of the newly discovered mineral finchite. The Denver Microbeam Lab provided this scan of finchite in order to help describe and identify the mineral as a new one. Finchite is a uranium mineral first observed in Martin County, Texas. Read more about our uranium research here

Image shows a sample of the mineral finchite with a chair wheel for scale
December 31, 2015

Finchite Mineral

A sample of finchite, a newly discovered uranium mineral. Finchite is the yellow material on the surface of the rock. Finchite is found in the late Pleistocene sediments deposited during the Illinoian glacial stage. It was first observed in Martin County, Texas. Read more about our uranium research here

Image shows a sample of finchite with a quarter for scale
December 31, 2015

Finchite Mineral

A sample of finchite, a newly discovered uranium mineral. Finchite is the yellow material on the surface of the rock. Finchite is found in the late Pleistocene sediments deposited during the Illinoian glacial stage. It was first observed in Martin County, Texas. Read more about our uranium research here

Image shows a man examine rock layers
December 31, 2015

USGS Scientist Examining Texas Rock Layers for Finchite Minerals

USGS scientist Bradley Van Gosen examines rock layers for the newly discovered mineral finchite near Lamesa, Texas. Van Gosen was the first to recognize the existence of the new mineral, which was named for long-time USGS uranium geologist Warren Finch. Read more about our uranium research here

Image shows a dry creek bed with two men standing on the banks
December 31, 2015

USGS Scientists Seeking Finchite by the Sulfur Springs Draw in Texas

Between Lamesa and Big Spring, Texas, runs the Sulfur Spring Draw, a dry creek. It's the site of an economic calcrete-type uranium deposit, the Sulfur Springs Draw Deposit, where a new mineral was discovered in 2015. The mineral, first observed by USGS scientist Bradley Van Gosen, is a uranium-mineral named finchite after long-time USGS uranium geologist Warren Finch. Read more about our...

USGS scientists stand on the edge of a ship, preparing equipment to go into the ocean
December 31, 2015

Sediment Sampling for Gas Hydrate

USGS scientists collect sediment samples in a gas hydrates area during a cruise on the U.S. Atlantic margin in 2015.

Image shows sand in a hand
December 31, 2015

Frac Sands in Hand

Frac sands used in unconventional oil and gas development.

Image shows a rock outcropping surrounded by desert vegation
December 31, 2015

Calcrete near Sulfur Springs Draw

A calcrete outcropping near Sulfur Springs Draw in Texas. This deposit dates to the Pliocene and Pleistocene, and hosts uranium-vanadate minerals.

October 21, 2015

What's the Big Idea? — Creating Cleaner Energy from Coal

Elliott Barnhart, a hydrologist with the USGS Wyoming-Montana Water Science Center, describes his work developing what could be a cleaner way to develop coal.

Image shows USGS scientists standing beside a drill rig in protective gear.
September 16, 2015

Black and White Night Drilling for the Eagle Ford

USGS scientists drilling a research core near Waco, Texas. This core was drilled by USGS during field work for an oil and gas assessment for the Eagle Ford of the Gulf Coast Basins. Cores like these provide information on the various rock layers, such as their make-up, their age, etc.

The USGS assesses undiscovered, technically recoverable oil and gas resources for the onshore United...

Image shows USGS scientists standing beside a drill rig in protective gear.
September 16, 2015

Moonrise over Night Drilling for the Eagle Ford

USGS scientists drilling a research core near Waco, Texas. This core was drilled by USGS during field work for an oil and gas assessment for the Eagle Ford of the Gulf Coast Basins. Cores like these provide information on the various rock layers, such as their make-up, their age, etc.

The USGS assesses undiscovered, technically recoverable oil and gas resources for the onshore United...

Image shows USGS scientists standing beside a drill rig in protective gear.
September 16, 2015

Moonlight over Night Drilling for the Eagle Ford

USGS scientists drilling a research core near Waco, Texas. This core was drilled by USGS during field work for an oil and gas assessment for the Eagle Ford of the Gulf Coast Basins. Cores like these provide information on the various rock layers, such as their make-up, their age, etc.

The USGS assesses undiscovered, technically recoverable oil and gas resources for the onshore United...

Filter Total Items: 129
Date published: January 19, 2016

Decades of Bat Observations Reveal Uptick in New Causes of Mass Mortality

FORT COLLINS, Colorado – Reports of bat deaths worldwide due to human causes largely unique to the 21st century are markedly rising, according to a new USGS-led analysis published in Mammal Review.

Date published: January 5, 2016

First Ever Digital Geologic Map of Alaska Published

ANCHORAGE, Alaska – A new digital geologic map of Alaska is being released today providing land users, managers and scientists geologic information for the evaluation of land use in relation to resource extraction, conservation, natural hazards and recreation.

Date published: December 18, 2015

EarthWord – Medical Geology

Medical Geology is an earth science specialty that concerns how geologic materials and earth processes affect human health. 

Date published: December 17, 2015

USGS Estimates 53 Trillion Cubic Feet of Gas Resources in Barnett Shale

The Barnett Shale contains estimated mean volumes of 53 trillion cubic feet of shale natural gas, 172 million barrels of shale oil and 176 million barrels of natural gas liquids, according to an updated assessment by the U.S. Geological Survey. This estimate is for undiscovered, technically recoverable resources.

Date published: December 17, 2015

U.S. Reliance on Nonfuel Mineral Imports Increasing

Key nonfuel mineral commodities that support the U.S. economy and national security are increasingly being sourced from outside the U.S., according to a new U.S. Geological Survey publication.

Date published: December 14, 2015

New Method for Ranking Global Copper Deposits Saves Time and Money

A new approach to ranking copper resources could result in identifying future supplies of copper while saving both time and money, according to the U.S. Geological Survey.

Date published: December 10, 2015

USGS Reports Large Shifts in Global Primary Tantalum Mining from 2000 to 2014

Reston, VA— The United States is completely reliant on imports of tantalum, which is a commonly used element in electronics, to meet its domestic consumption for economic and national security needs. A new U.S. Geological Survey report illustrates the dramatic change of the international sources of primary mined tantalum over the past 15 years.

Date published: December 2, 2015

Estimates of Potential Uranium in South Texas Could Equal Five Years of U.S. Needs

The uranium oxide is located in sandstone formations throughout the South Texas Coastal Plain, which borders the Gulf of Mexico. The area has long been known to contain uranium, and two mines are currently in operation, with a number of companies actively exploring for uranium.

Date published: November 18, 2015

Estimates of Undiscovered Copper in Middle East Ten Times Current World Production

More than 180 million metric tons of undiscovered copper resources may be found in an area of the Middle East that covers Turkey, Georgia, Armenia, Azerbaijan, Iran, western Pakistan and southwestern Afghanistan, according to a recent assessment by the U.S. Geological Survey.

Date published: November 3, 2015

New Tool Rates Stream Vulnerability to Unconventional Oil and Gas Development

On average, streams in the Niobrara-Mowry Play of eastern Wyoming, Fayetteville Play of Arkansas, and Barnett Play of Texas ranked most vulnerable to unconventional oil and gas development, but for different reasons, according to recent U.S. Geological Survey coauthored research.

Date published: October 14, 2015

Birds in the Bakken: Oil Development Can Affect Critical Habitat

Many grassland bird species in the Bakken shale region, including some seriously declining populations, are displaced from their habitats as a result of oil and gas development, according to new U.S. Geological Survey research.

Date published: October 12, 2015

EarthWord: Graben

A graben is a piece of Earth’s crust that is shifted downward in comparison to adjacent crust known as “horsts,” which are shifted upward.