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Filter Total Items: 591
Year Published: 2016

Geologic history of the Blackbird Co-Cu district in the Lemhi subbasin of the Belt-Purcell Basin

The Blackbird cobalt-copper (Co-Cu) district in the Salmon River Mountains of east-central Idaho occupies the central part of the Idaho cobalt belt—a northwest-elongate, 55-km-long belt of Co-Cu occurrences, hosted in grayish siliciclastic metasedimentary strata of the Lemhi subbasin (of the Mesoproterozoic Belt-Purcell Basin). The Blackbird...

Bookstrom, Arthur A.; Box, Stephen E.; Cossette, Pamela M.; Frost, Thomas P.; Gillerman, Virginia; King, George; Zirakparvar, N. Alex

Year Published: 2016

Geology of the Greenwater Range, and the dawn of Death Valley, California—Field guide for the Death Valley Natural History Conference, 2013

Much has been written about the age and formation of Death Valley, but that is one—if not the last—chapter in the fascinating geologic history of this area. Igneous and sedimentary rocks in the Greenwater Range, one mountain range east of Death Valley, tell an earlier story that overlaps with the formation of Death Valley proper. This...

Calzia, J.P.; Rämö, O.T.; Jachens, Robert; Smith, Eugene; Knott, Jeffrey
Calzia, J.P., Rämö, O.T., Jachens, Robert, Smith, Eugene, and Knott, Jeffrey, 2016, Geology of the Greenwater Range, and the dawn of Death Valley, California—Field guide for the Death Valley Natural History Conference, 2013: U.S. Geological Survey Open-File Report 2016–1064, 32 p., http://dx.doi.org/10.3133/ofr20161064.

Year Published: 2016

Geologic and geochemical insights into the formation of the Taiyangshan porphyry copper–molybdenum deposit, Western Qinling Orogenic Belt, China

Taiyangshan is a poorly studied copper–molybdenum deposit located in the Triassic Western Qinling collisional belt of northwest China. The intrusions exposed in the vicinity of the Taiyangshan deposit record episodic magmatism over 20–30 million years. Pre-mineralization quartz diorite porphyries, which host some of the...

Kun-Feng Qiu; Taylor, Ryan D.; Yao-Hui Song; Hao-Cheng Yu; Kai-Rui Song; Nan Li

Year Published: 2016

Magnetotelluric investigation of the Vestfold Hills and Rauer Group, East Antarctica

The Vestfold Hills and Rauer Group in East Antarctica have contrasting Archean to Neoproterozoic geological histories and are believed to be juxtaposed along a suture zone that now lies beneath the Sørsdal Glacier. Exact location and age of this suture zone are unknown, as is its relationship to regional deformation associated with the...

Peacock, Jared R.; Selway, Katherine
Selway, K., and J. R. Peacock (2016), Magnetotelluric investigation of the Vestfold Hills and Rauer Group, East Antarctica, J. Geophys. Res. Solid Earth, 121, doi:10.1002/2015JB012677.

Year Published: 2016

The Chahnaly low sulfidation epithermal gold deposit, western Makran volcanic arc, southeastern Iran

The Chahnaly low-sulfidation epithermal Au deposit and nearby Au prospects are located northwest of the intermittently active Bazman stratovolcano on the western end of the Makran volcanic arc, which formed as the result of subduction of the remnant Neo-Tethyan oceanic crust beneath the Lut block. The arc hosts the Siah Jangal epithermal and...

Sholeh, Ali; Rastad, Ebrahim; Huston, David L.; Gemmell, J. Bruce; Taylor, Ryan D.
Sholeh, A., Rastad, E., Huston, D., Gemmell, J.B., and Taylor, R.D., 2016, The Chahnaly low sulfidation epithermal gold deposit, western Makran volcanic arc, southeastern Iran: Economic Geology, v. 111, p. 619-639

Year Published: 2016

User’s guide for GcClust—An R package for clustering of regional geochemical data

GcClust is a software package developed by the U.S. Geological Survey for statistical clustering of regional geochemical data, and similar data such as regional mineralogical data. Functions within the software package are written in the R statistical programming language. These functions, their documentation, and a copy of the user’s guide are...

Ellefsen, Karl J.; Smith, David B.
Ellefsen, K.J, and Smith, D.B., 2016, User's guide for GcClust—An R package for clustering of regional geochemical data: U.S. Geological Survey report Techniques and Methods 7–C13, 21 p., http://dx.doi.org/10.3133/tm7c13.

Year Published: 2016

Assessment of undiscovered oil and gas resources of the Taoudeni Basin Province, Mali and Mauritania, 2015

Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean resources of 160 million barrels of conventional oil, 1,880 billion cubic feet of conventional gas, 602 million barrels of shale oil, and 6,395 billion cubic feet of shale gas in the Taoudeni Basin Province in Mali and...

Brownfield, Michael E.; Schenk, Christopher J.; Klett, Timothy R.; Tennyson, Marilyn E.; Pitman, Janet K.; Gaswirth, Stephanie B.; Le, Phuong A.; Leathers-Miller, Heidi M.; Mercier, Tracey J.; Marra, Kristen R.; Hawkins, Sarah J.
Brownfield, M.E., Schenk, C.J., Klett, T.R., Tennyson, M.E., Pitman, J.K., Gaswirth, S.B., Le, P.A., Leathers-Miller, H.M., Mercier, T.J., Marra, K.R., and Hawkins, S.J., 2016, Assessment of undiscovered oil and gas resources of the Taoudeni Basin Province, Mali and Mauritania, 2015: U.S. Geological Survey Fact Sheet 2016-3003, 2 p., http://dx.doi.org/10.3133/fs20163003.

Year Published: 2016

A process for reducing rocks and concentrating heavy minerals

To obtain minerals suitable for age-dating and other analyses, it is necessary to first reduce the mineral-bearing rock to a fine, sand-like consistency. Reducing whole rock requires crushing, grinding, and sieving. Ideally, the reduced material should range in size from 80- to 270-mesh (an opening between wires in a sieve). The openings in an 80-...

Strong, Thomas R.; Driscoll, Rhonda L.
Strong, T.R., and Driscoll, R.L., 2016, A process for reducing rocks and concentrating heavy minerals: U.S. Geological Survey Open-File Report 2016–1022, 16 p., http://dx.doi.org/10.3133/ofr20161022.

Year Published: 2016

Geology and undiscovered resource assessment of the potash-bearing Central Asia Salt Basin, Turkmenistan, Uzbekistan, Tajikistan, and Afghanistan: Chapter AA in Global mineral resource assessment

Undiscovered potash resources in the Central Asia Salt Basin (CASB) of Turkmenistan, Uzbekistan, Tajikistan, and Afghanistan were assessed as part of a global mineral resource assessment led by the U.S. Geological Survey. The term “potash” refers to potassium-bearing, water-soluble salts derived from evaporite basins, where seawater...

Wynn, Jeff; Orris, Greta J.; Dunlap, Pamela; Cocker, Mark D.; Bliss, James D.
Wynn, Jeff, Orris, G.J., Dunlap, Pamela, Cocker, M.D., and Bliss, J.D., 2016, Geology and undiscovered resource assessment of the potash-bearing Central Asia Salt Basin, Turkmenistan, Uzbekistan, Tajikistan, and Afghanistan: U.S. Geological Survey Scientific Investigations Report SIR 2010–5090–AA, 106 p., and spatial data, http://dx.doi.org/10.3133/sir20105090AA.

Year Published: 2016

Critical elements in sediment-hosted deposits (clastic-dominated Zn-Pb-Ag, Mississippi Valley-type Zn-Pb, sedimentary rock-hosted Stratiform Cu, and carbonate-hosted Polymetallic Deposits): A review: Chapter 12

Some sediment-hosted base metal deposits, specifically the clastic-dominated (CD) Zn-Pb deposits, carbonate-hosted Mississippi Valley-type (MVT) deposits, sedimentary-rock hosted stratiform copper deposits, and carbonate-hosted polymetallic (“Kipushi type”) deposits, are or have been important sources of critical elements including Co, Ga, Ge,...

Marsh, Erin; Hitzman, Murray W.; Leach, David L.

Year Published: 2016

Rockfall triggering by cyclic thermal stressing of exfoliation fractures

Exfoliation of rock deteriorates cliffs through the formation and subsequent opening of fractures, which in turn can lead to potentially hazardous rockfalls. Although a number of mechanisms are known to trigger rockfalls, many rockfalls occur during periods when likely triggers such as precipitation, seismic activity and freezing conditions are...

Collins, Brian; Stock, Greg M.
Collins, B.D. and Stock, G.M., 2016, Rockfall triggering by cyclic thermal stressing of exfoliation fractures, Nature Geoscience, Vol. 9, pp. 395-401, doi:10.1038/ngeo2686.

Year Published: 2016

Paleozoic magmatism and porphyry Cu-mineralization in an evolving tectonic setting in the North Qilian Orogenic Belt, NW China

The NWW-striking North Qilian Orogenic Belt records the Paleozoic accretion–collision processes in NW China, and hosts Paleozoic Cu–Pb–Zn mineralization that was temporally and spatially related to the closure of the Paleo Qilian-Qinling Ocean. The Wangdian Cu deposit is located in the eastern part of the North Qilian Orogenic...

Qiu, Kun-Feng; Deng, Jun; Taylor, Ryan D.; Song, Kai-Rui; Song, Yao-Hui; Li, Quan-Zhong; Goldfarb, Richard J.
Qiu, K.F., Deng, J., Taylor, R.D., Song, K.R., Song, Y.H., Li, Q.Z., and Goldfarb, R.J., 2016, Paleozoic magmatism and porphyry Cu-mineralization in an evolving tectonic setting in the North Qilian orogenic belt, NW China: Journal of Asian Earth Sciences, v. 122, p. 20-40.

Filter Total Items: 112
October 21, 2015
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
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 States and...
Image shows USGS scientists standing beside a drill rig in protective gear.
September 16, 2015
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 States and...
A vehicle is shown at night, with its trunk open and floodlights on
September 16, 2015
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 States and...
Image shows USGS scientists standing beside a drill rig in protective gear.
September 16, 2015
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 States and...
Image shows USGS scientists standing beside a drill rig in protective gear.
September 16, 2015
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 States and...
Image shows USGS scientists standing beside a drill rig in protective gear.
September 16, 2015
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 States and...
Image shows USGS scientists standing beside a drill rig in protective gear.
September 14, 2015
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 States and...
Image shows USGS scientists standing beside a drill rig in protective gear.
September 14, 2015
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 States and...
Image shows a drill core in a box with cardboard dividers
September 12, 2015
A drill core from 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 States and state territorial waters...
Image shows a drill core in a box with cardboard dividers
September 12, 2015
A drill core from 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 States and state territorial waters...
Image shows a cross-section of a drill core, held in two gloved hands
September 12, 2015
A drill core from 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 States and state territorial waters...
Filter Total Items: 114
A map showing the Barnett Shale assessment area in east Texas
December 17, 2015

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.

USGS science for a changing world logo
December 17, 2015

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.

Figure showing the top three ranked areas.
December 14, 2015

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.

Graph: Annual mine production of tantalum contained in mined concentrates
December 10, 2015

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.

Map: Area of Uranium Assessment in Texas
December 2, 2015

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.

Map of Undiscovered Cooper Estimate in the Middle East
November 18, 2015

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.

USGS science for a changing world logo
November 3, 2015

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.

USGS science for a changing world logo
October 14, 2015

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.

Aerial view of the Grabens, Canyonlands National Park
October 12, 2015

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.

Map of San Joaquin Basin Province
October 6, 2015

The Monterey Formation in the deepest parts of California’s San Joaquin Basin contains an estimated mean volumes of 21 million barrels of oil, 27 billion cubic feet of gas, and 1 million barrels of natural gas liquids, according to the first USGS assessment of continuous (unconventional), technically recoverable resources in the Monterey Formation.

An image of calcite.
September 21, 2015

The process in which magnesium is removed from the mineral dolomite (calcium magnesium carbonate) leaving behind the minerals calcite (calcium carbonate) and periclase (magnesium oxide.)

Image: Moon over Half Dome
September 7, 2015

Despite sounding like something out of Harry Potter, a batholith is a type of igneous rock that forms when magma rises into the earth’s crust, but does not erupt onto the surface. The magma cools beneath the earth’s surface, forming a rock structure that extends at least one hundred square kilometers across (40 square miles), and extends to an unknown depth.