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Filter Total Items: 716
Year Published: 2017

Geologic map of the northern White Hills, Mohave County, Arizona

IntroductionThe northern White Hills map area lies within the Kingman Uplift, a regional structural high in which Tertiary rocks lie directly on Proterozoic rocks as a result of Cretaceous orogenic uplift and erosional stripping of Paleozoic and Mesozoic strata. The Miocene Salt Spring Fault forms the major structural boundary in the map area....

Howard, Keith A.; Priest, Susan S.; Lundstrom, Scott C.; Block, Debra L.
Howard, K.A., Priest, S.S., Lundstrom, S.C., and Block, D.L., 2017, Geologic map of the northern White Hills, Mohave County, Arizona: U.S. Geological Survey Scientific Investigations Map 3372, pamphlet 31 p., scale 1:50,000, https://doi.org/10.3133/sim3372.

Year Published: 2017

Quantifying the heterogeneity of the tectonic stress field using borehole data

The heterogeneity of the tectonic stress field is a fundamental property which influences earthquake dynamics and subsurface engineering. Self-similar scaling of stress heterogeneities is frequently assumed to explain characteristics of earthquakes such as the magnitude-frequency relation. However, observational evidence for such scaling of the...

Schoenball, Martin; Davatzes, Nicholas C.
[complete this] Schoenball, Martin, and Davatzes, Nicholas C., 2016, Quantifying the heterogeneity of the tectonic stress field using local and global borehole data: Journal of Geophysical Research, doi:10.1002/2017JB014370.

Year Published: 2017

10Be dating of late Pleistocene megafloods and Cordilleran Ice Sheet retreat in the northwestern United States

During the late Pleistocene, multiple floods from drainage of glacial Lake Missoula further eroded a vast anastomosing network of bedrock channels, coulees, and cataracts, forming the Channeled Scabland of eastern Washington State (United States). However, the timing and exact pathways of these Missoula floods remain poorly constrained, thereby...

Balbas, Andrea M.; Barth, Aaron M.; Clark, Peter U.; Clark, Jorie; Caffee, Marc A.; O'Connor, Jim E.; Baker, Victor R.; Konrad, Kevin; Bjornstad, Bruce
Balbas, A., Barth, A.M., Clark, P.U., Clark, J., Caffee, M, O’Connor, J.E., Baker, V.R., Konrad, K., Bjornstad, B.,2 017, 10Be dating of late-Pleistocene megafloods and Cordilleran ice-sheet retreat in the northwestern U.S. Geology. First published on May 8, 2017, doi:10.1130/G38956.1

Year Published: 2017

Microbial survival strategies in ancient permafrost: insights from metagenomics

In permafrost (perennially frozen ground) microbes survive oligotrophic conditions, sub-zero temperatures, low water availability and high salinity over millennia. Viable life exists in permafrost tens of thousands of years old but we know little about the metabolic and physiological adaptations to the challenges presented by life in frozen ground...

Mackelprang, Rachel; Burkert, Alexander; Haw, Monica; Mahendrarajah, Tara; Conaway, Christopher H.; Douglas, Thomas A.; Waldrop, Mark P.
The ISME Journal 11, 2305–2318 (2017)

Year Published: 2017

Spatiotemporal analysis of changes in lode mining claims around the McDermitt Caldera, northern Nevada and southern Oregon

Resource managers and agencies involved with planning for future federal land needs are required to complete an assessment of and forecast for future land use every ten years. Predicting mining activities on federal lands is difficult as current regulations do not require disclosure of exploration results. In these cases, historic mining claims...

Coyan, Joshua; Zientek, Michael L.; Mihalasky, Mark J.
Coyan, J.A., Zientek, M.L. & Mihalasky, M.J. Nat Resour Res (2017) 26: 319. doi:10.1007/s11053-017-9324-9

Year Published: 2017

The interacting roles of climate, soils, and plant production on soil microbial communities at a continental scale

Soil microbial communities control critical ecosystem processes such as decomposition, nutrient cycling, and soil organic matter formation. Continental scale patterns in the composition and functioning of microbial communities are related to climatic, biotic, and edaphic factors such as temperature and precipitation, plant community composition,...

Waldrop, Mark P.; Holloway, JoAnn M.; Smith, David; Goldhaber, Martin B.; Drenovsky, R.E.; Scow, K.M.; Dick, R.; Howard, Daniel M.; Wylie, Bruce K.; Grace, James B.
Waldrop, M.P., Holloway, J.M., Smith, D.B., Goldhaber, M.B., Drenovsky, R.E., Scow, K.M., Dick, R., Howard, D., Wylie, B., and Grace, J.B., 2017, The interacting roles of climate, soils, and plant production on soil microbial communities at a continental scale: Ecology, v. 98, no. 7, p. 1957-1967, https://doi.org/10.1002/ecy.1883.

Year Published: 2017

The Neogene genus Streptochilus (Brönnimann and Resig, 1971) from the Gulf of California

Four species of the planktonic foraminiferal genus Streptochilus from key Neogene marine localities are documented in relation to the evolution of the Gulf of California: S. globigerus, S. latus, S. macdougallae sp. nov., and S. inglei sp. nov. Planktonic foraminiferal bioevents and strontium isotopes in the Bouse, Tirabuzón, Carmen and Ojo de...

Miranda Martínez, A.Y.; Carreño, A.L.; McDougall, Kristin
Miranda-Martínez, A. Y., Carreño, A. L., & McDougall, K. (2017, April). The Neogene genus Streptochilus (Brönnimann and Resig, 1971) from the Gulf of California. Marine Micropaleontology. Elsevier BV. https://doi.org/10.1016/j.marmicro.2017.05.001

Year Published: 2017

Geologic map of the Beacon Rock quadrangle, Skamania County, Washington

The Beacon Rock 7.5′ quadrangle is located approximately 50 km east of Portland, Oregon, on the north side of the Columbia River Gorge, a scenic canyon carved through the axis of the Cascade Range by the Columbia River. Although approximately 75,000 people live within the gorge, much of the region remains little developed and is encompassed by the...

Evarts, Russell C.; Fleck, Robert J.
Evarts, R.C., and Fleck, R.J., 2017, Geologic map of the Beacon Rock quadrangle, Skamania County, Washington: U.S. Geological Survey Scientific Investigations Map 3367, pamphlet 61 p., scale 1:24,000, https://doi.org/10.3133/sim3367.

Year Published: 2017

Regional and temporal variability of melts during a Cordilleran magma pulse: Age and chemical evolution of the jurassic arc, eastern mojave desert, California

Intrusive rock sequences in the central and eastern Mojave Desert segment of the Jurassic Cordilleran arc of the western United States record regional and temporal variations in magmas generated during the second prominent pulse of Mesozoic continental arc magmatism. U/Pb zircon ages provide temporal control for describing variations in rock and...

Barth, A.P.; Wooden, J.L.; Miller, David; Howard, Keith A.; Fox, Lydia; Schermer, Elizabeth R.; Jacobson, C.E.
Regional and temporal variability of melts during a Cordilleran magma pulse: Age and chemical evolution of the Jurassic arc, eastern Mojave Desert, California. Barth A.P., Wooden J.L., Miller D.M., Howard K.A., Fox L.K., Schermer E.R., Jacobson C.E. Geological Society of America Bulletin. 5 October 2016. v. 129 no. 3-4 p. 429-448

Year Published: 2017

Assessing changes in the physico-chemical properties and fluoride adsorption capacity of activated alumina under varied conditions

Adsorption using activated alumina is a simple method for removing fluoride from drinking water, but to be cost effective the adsorption capacity must be high and effective long-term. The intent of this study was to assess changes in its adsorption capacity under varied conditions. This was determined by evaluating the physico-chemical properties...

Craig, Laura; Stillings, Lisa; Decker, David L.

Year Published: 2017

Re-Os systematics and geochemistry of cobaltite (CoAsS) in the Idaho cobalt belt, Belt-Purcell Basin, USA: Evidence for middle Mesoproterozoic sediment-hosted Co-Cu sulfide mineralization with Grenvillian and Cretaceous remobilization

We report the first study of the Re-Os systematics of cobaltite (CoAsS) using disseminated grains and massive sulfides from samples of two breccia-type and two stratabound deposits in the Co-Cu-Au Idaho cobalt belt (ICB), Lemhi subbasin to the Belt-Purcell Basin, Idaho, USA. Using a 185Re + 190Os spike solution, magnetic and non-...

Saintilan, N.J.; Creaser, R.A.; Bookstrom, Arthur A.
Saintilan, N.J., Creaser, R.A., and Bookstrom, A.A., 2017, Re-Os systematics and geochemistry of cobaltite (CoAsS) in the Idaho cobalt belt, Belt-Purcell Basin, USA: Evidence for middle Mesoproterozoic sediment-hosted Co-Cu sulfide mineralization with Grenvillian and Cretaceous remobilization: Ore Geology Reviews, v. ?, p. ?

Year Published: 2017

Cascadia subduction tremor muted by crustal faults

Deep, episodic slow slip on the Cascadia subduction megathrust of western North America is accompanied by low-frequency tremor in a zone of high fluid pressure between 30 and 40 km depth. Tremor density (tremor epicenters per square kilometer) varies along strike, and lower tremor density statistically correlates with upper plate faults that...

Wells, Ray; Blakely, Richard J.; Wech, Aaron G.; McCrory, Patricia A.; Michael, Andrew
Wells, RE, Blakely, RJ, Wech, AG, McCrory, Michael, A., 2017, Cascadia subduction tremor muted by crustal faults. Geology, 45(6) 515-518.

Filter Total Items: 139
Close up of Sphalerite
March 23, 2017

Sphalerite

Sphalerite, zinc sulfide, is and has been the principal ore mineral in the world. Zinc uses range from metal products to rubber and medicines. Zinc alloys readily with other metals and is chemically active. On exposure to air, it develops a thin gray oxide film (patina), which inhibits deeper oxidation (corrosion) of the metal. The metal’s resistance to corrosion is an important characteristic...

Close up of Chromite
March 23, 2017

Chromite

Mineral: Chromite
Mineral Origin: Owings Mills, MD
Primary Commodity: Chromium
Primary Commodity Uses: Chromium mostly goes into stainless steel and other alloys, as well as in color pigments.

Close up of salt, sodium, chlorine
March 23, 2017

Salt, Sodium, Chlorine

Mineral: Halite (NaCl)
Primary mineral Commodity: Salt
Commodity Uses: Highway deicing accounted for about 44% of total salt consumed in 2016. Salt is also used as feedstock for chlorine and caustic soda manufacture; these two inorganic chemicals are used to make many consumer-related end-use products, such as polyvinyl chloride (PVC...

Close up Stibnite
March 23, 2017

Stibnite

Stibnite (Sb2S3) is the predominant ore mineral of antimony. Antimony compounds help prevent skin burns, increase battery life, and refine glass used for cellphones. A surprising 83% of antimony consumed stateside is imported—mostly from China—leaving the US susceptible to supply disruption. The largest domestic antimony resource (estimated at 41,000 tonnes) is in a meso- to epithermal gold-...

Close up of Chalcopyrite, Pentlandite, and Pyrrhotite
March 23, 2017

Chalcopyrite, Pentlandite, and Pyrrhotite

Mineral: Chalcopyrite, Pentlandite, Pyrrhotite
Mineral Origin: Creighton Mine, Sudbury, Ontario, Canada (Sample on loan from George J. Coakley)
Primary Commodity: Copper and nickel
Primary Commodity Uses: Copper is used primarily in electronics, mostly in building construction and industrial electronics. Nickel...

Full view of Molybdenite
March 23, 2017

Molybdenite

Mineral: Molybdenite
Mineral Origin: Henderson Mine, Empire, CO
Primary Mineral Commodity: Molybdenum
Mineral Commodity Uses: In the late 19th century, French metallurgists discovered that molybdenum, when alloyed (mixed) with steel in small quantities, creates a substance that is remarkably tougher than steel...

Close up of Bertrandite
March 23, 2017

Bertrandite

Mineral: Bertrandite (in carbonate clasts that have been largely replaced by fluorite (purple) that contains submicroscopic bertrandite)
Mineral Origin: Spor Mountain, UT
Primary Commodity: Beryllium
Primary Commodity Uses: Beryllium alloys are used in making connectors, springs, switches and other components of...

Close up of Lead
March 23, 2017

Lead

Lead is a corrosion-resistant dense metal that is easily molded and shaped. 85% of lead in the US is used for lead-acid batteries, which are used in automobiles, as industrial-type batteries for standby power for computer and telecommunications networks, and for motive power.

Full view of Bauxite sample
March 23, 2017

Bauxite

Mineral: Bauxite
Mineral Origin: Les Baux, France (Sample donated by Gary Kingston)
Primary Commodity: Aluminum and Gallium
Primary Commodity Uses: Aluminum is one of the most used metals on the planet, finding roles in transportation, construction, packaging, electronics, and other consumer goods. Gallium is...

Close up of Graphite
March 23, 2017

Graphite in Pegmatite Rock

Mineral: Graphite (C) in pegmatite rock
Mineral Origin: Ticonderoga, NY
Primary Mineral Commodity: Graphite
Mineral Commodity Uses: brake linings, foundry operations, heat-resistant lubricants, refractory applications, and steelmaking

Close up of Bauxite
March 23, 2017

Bauxite

Mineral: Bauxite
Mineral Origin: Les Baux, France (Sample donated by Gary Kingston)
Primary Commodity: Aluminum and Gallium
Primary Commodity Uses: Aluminum is one of the most used metals on the planet, finding roles in transportation, construction, packaging, electronics, and other consumer goods. Gallium is...

Close up of Specularite
March 23, 2017

Specularite

Mineral: Specularite (a variety of Hematite)
Mineral Origin: Republic Mine, MI
Primary Mineral Commodity: Iron
Commodity Uses: Steelmaking

Filter Total Items: 131
Date published: May 11, 2017

Magmas to Metals

No one wants to have an active volcano in their backyard (just ask Dionisio Pulido), but ancient eroded volcanoes can sometimes be literal goldmines for mineral ores.

Date published: May 3, 2017

Plumbing the Depths of the Great Basin

Vast mineral wealth has been discovered in the Great Basin since the 1800s. As each new generation of prospectors and geologists brings their cutting-edge tools with them, the arid ridgelines of the desert Southwest have shown more and more potential.

Date published: April 30, 2017

Bon Anniversaire, Louisiane!

On its 205th anniversary, Louisiana still rocks.

Date published: April 28, 2017

Happy 229th Birthday, Maryland!

On its 229th birthday, Maryland still rocks.

Date published: April 25, 2017

EarthWord–Placer

Whether you pan for gold or rare earths, you’ll get a lot of sand...and this EarthWord!

Date published: April 20, 2017

USGS Spectral Library gets Ultra- and Hyper- Revamp

We've got a library full of spectral signatures, like a police fingerprint library for minerals and other substances!

Date published: April 18, 2017

EarthWord–Ferrous

While not a Ferris wheel, this EarthWord is just as magnetic an attraction...

Date published: April 14, 2017

The Top 5 Mineral-Producing States

In 2016, these five states led the pack in mineral production, accounting for about one third of the total mineral production value for the entire country.

Date published: April 13, 2017

USGS Estimates 304 Trillion Cubic Feet of Natural Gas in the Bossier and Haynesville Formations of the U.S. Gulf Coast

USGS also estimates 4 billion barrels of oil and 2 billion barrels of natural gas liquids in the two formations.