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Filter Total Items: 785
Year Published: 2017

Mineralogical characterization of weathered outcrops as a tool for constraining water chemistry predictions during project planning

Weathered samples from naturally exposed outcrops of troctolite associated with a magmatic Ni-Cu sulphide deposit were characterized by synchrotron-based micro-X-ray fluorescence mapping (µ-XRF) and X-ray absorption spectroscopy (XAS), as well as by lab-based X-ray diffraction, electron microscopy, Raman spectroscopy and wet chemical methods....

Diedrich, Tamara; Fix, Paul; Foster, Andrea L.
T. Diedrich, P. Fix, and A. Foster (2017) Mineralogical characterization of weathered outcrops as a tool for constraining water chemistry predictions during project planning. Proceedings of IMWA 2017, "Mine Water and Circular Economy" , Wolkersdorfer C, Sartz L., and Hakkinen A, Editors, p. 712-719

Year Published: 2017

The late Cenozoic Eastern California Shear Zone after 25 years of study

No abstract available.

Miller, David
Miller, D.M., 2017, The late Cenozoic Eastern California Shear Zone after 25 years of study, in Reynolds, R.E., ed., Revisiting the Eastern California Shear Zone: California State University, Fullerton, Desert Studies Consortium, p. 45-54.

Year Published: 2017

Impact-related microspherules in Late Pleistocene Alaskan and Yukon “muck” deposits signify recurrent episodes of catastrophic emplacement

Large quantities of impact-related microspherules have been found in fine-grained sediments retained within seven out of nine, radiocarbon-dated, Late Pleistocene mammoth (Mammuthus primigenius) and bison (Bison priscus) skull fragments. The well-preserved fossils were recovered from frozen “muck” deposits (organic-rich silt) exposed within the...

Hagstrum, Jonathan T.; Firestone, Richard B.; West, Allen; Weaver, James C.; Bunch, Ted E.
Hagstrum, JT, Firestone, RB, West, A, Weaver, JC, and Bunch, TE (2017) Impact-related microspherules in Late Pleistocene Alaskan and Yukon “muck” deposits signify recurrent episodes of catastrophic emplacement. Scientific Reports 7:16620, DOI: 10.1038/s41598-017-16958-2.

Year Published: 2017

Lidar-revised geologic map of the Des Moines 7.5' quadrangle, King County, Washington

This map is an interpretation of a modern lidar digital elevation model combined with the geology depicted on the Geologic Map of the Des Moines 7.5' Quadrangle, King County, Washington (Booth and Waldron, 2004). Booth and Waldron described, interpreted, and located the geology on the 1:24,000-scale topographic map of the Des Moines 7.5'...

Tabor, Rowland W.; Booth, Derek B.
Tabor, R.W., and Booth, D.B., 2017, Lidar-revised geologic map of the Des Moines 7.5' quadrangle, King County, Washington: U.S. Geological Survey Scientific Investigations Map 3384, 17 p., 1 sheet, scale 1:24,000, https://doi.org/10.3133/sim3384.

Year Published: 2017

Introduction

No abstract available.

Bundtzen, Thomas K.; Nokleberg, Warren J.; Price, Raymond A.; Scholl, David W.; Stone, David B.; Nokleberg, Warren J.
Nokleberg, W.J., 2017, Introduction to E-Book on Dynamic Geology of the Northern Cordillera (Alaska and Western Canada) and Adjacent Marine Areas: Tectonics, Hazards, and Resources, in Nokleberg, W.J., ed., Dynamic Geology of the Northern Cordillera (Alaska and Western Canada) and Adjacent Marine Areas: Tectonics, Hazards, and Resources: University of Alaska ScholarWorks@UA, 18 p.

Year Published: 2017

Landscapes and seascapes and tectonics

No abstract available.

Bundtzen, Thomas K.; Nokleberg, Warren J.; Price, Raymond A.; Scholl, David W.; Stone, David B.; Nokleberg, Warren J.; Scholl, David; Bundtzen, Thomas K.; Stone, David B.
Nokleberg, W.J., Bundtzen, T.K., Scholl, D.W., and Stone, D.B., 2017, Landscapes and Seascapes and Tectonics, in Nokleberg, W.J., ed., Dynamic Geology of the Northern Cordillera (Alaska and Western Canada) and Adjacent Marine Areas: Tectonics, Hazards, and Resources: University of Alaska ScholarWorks@UA, 59 p.

Year Published: 2017

Marine geology and tectonics--What is under all that water?

This chapter is divided into two main sections. The first section is on Marine Geology Seascapes (what earth scientists call bathymetry). The second section is on Tectonics of Marine Areas.

Bundtzen, Thomas K.; Nokleberg, Warren J.; Price, Raymond A.; Scholl, David W.; Stone, David B.; Scholl, David W.; Nokleberg, Warren J.

Year Published: 2017

Regional geology and tectonics

This chapter describes the regional geology and tectonic origins of the major geologic units for the Northern Cordillera. The goals of the chapter are to: (1) provide a summary and regional overview of this vast region that contains a complicated geologic history; and (2) describe the major geologic units and tectonic events that cover a broad...

Bundtzen, Thomas K.; Nokleberg, Warren J.; Price, Raymond A.; Scholl, David W.; Stone, David B.; Nokleberg, Warren J.

Year Published: 2017

The story of a Yakima fold and how it informs Late Neogene and Quaternary backarc deformation in the Cascadia subduction zone, Manastash anticline, Washington, USA

The Yakima folds of central Washington, USA, are prominent anticlines that are the primary tectonic features of the backarc of the northern Cascadia subduction zone. What accounts for their topographic expression and how much strain do they accommodate and over what time period? We investigate Manastash anticline, a north vergent fault propagation...

Kelsey, Harvey M.; Ladinsky, Tyler C.; Staisch, Lydia; Sherrod, Brian; Blakely, Richard J.; Pratt, Thomas; Stephenson, William; Odum, Jackson K.; Wan, Elmira
Kelsey, H. M., Ladinsky, T. C., Staisch L., Sherrod, B. L., Blakely, R. J., Pratt, T. L.,… Wan, E. (2017). The story of a Yakima fold and how it informs late Neogene and Quaternary backarc deformation in the Cascadia Subduction Zone, Manastash anticline, Washington, USA. Tectonics, 36, 2085–2107. https://doi.org/10.1002/ 2017TC004558

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

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)

Filter Total Items: 140
Close up of Feldspar
March 23, 2017

Feldspar

Mineral: Feldspar
Primary Commodity: Feldspar
Primary Commodity Uses: Feldspar is one of the most common minerals on the planet and is mostly used for glassmaking and ceramics.

Close up of Garnet Schist
March 23, 2017

Garnet Schist

Mineral: Garnet Schist
Primary Commodity: Garnet
Primary Commodity Uses: Garnet is mostly used for abrasives, water filtration, and some electronics

Close up of Silicon Carbide
March 23, 2017

Silicon Carbide

Mineral: Silicon Carbide
Mineral Origin: Sample donated by Norton Company
Primary Commodity: Silica (abrasive)
Primary Commodity Uses: Just as their name implies, abrasives are used to abrade, clean, etch, grind, polish, scour, or otherwise remove material

Close up of Silicon Carbide
March 23, 2017

Silicon Carbide

Mineral: Silicon Carbide
Mineral Origin: Sample donated by Norton Company
Primary Commodity: Silica (abrasive)
Primary Commodity Uses: Just as their name implies, abrasives are used to abrade, clean, etch, grind, polish, scour, or otherwise remove material

Close up of Silicon Carbide
March 23, 2017

Silicon Carbide

Mineral: Silicon Carbide
Mineral Origin: Sample donated by Norton Company
Primary Commodity: Silica (abrasive)
Primary Commodity Uses: Just as their name implies, abrasives are used to abrade, clean, etch, grind, polish, scour, or otherwise remove material

Close up of Tungsten Ore - Wolframite
March 23, 2017

Wolframite

Mineral: Wolframite
Primary Commodity: Tungsten
Primary Commodity Uses: Tungsten is one of the densest metals on the planet, and therefore gets used in metalworking and construction, as well as in heat sinks, weights, and even vibrating batteries.

Close up of Vanadinite
March 23, 2017

Vanadinite

Mineral: Vanadinite
Mineral Origin: J.C. Holmes Claim, Patagonia, AZ (Sample donated by G. van Oss)
Primary Commodity: Vanadium
Primary Commodity Uses: Vanadium is used mostly in metal alloys, primarily in car parts and jet engines. The United States is currently 100% reliant on foreign sources for vanadium used...

Close up of Bismuthinite
March 23, 2017

Bismuthinite

Primary Commodity: Bismuth

Primary Commodity Uses: Bismuth is the heaviest of the heavy metals and the only non-toxic one at that. As such, it’s seen a lot of use in replacements for lead, as well as in medications and atomic research.

Close up of Fluorite
March 23, 2017

Fluorite

Mineral: Fluorite
Mineral Origin: Cave-in-Rock District, IL (Sample donated by H.B. Wood)
Primary Commodity: Fluorspar 
Primary Commodity Uses: Fluorspar is used directly or indirectly to manufacture products such as aluminum, gasoline, insulating foams, refrigerants, steel, and uranium fuel. 

Close up of Rutile
March 23, 2017

Rutile

Mineral: Rutile
Primary Commodity: Titanium
Primary Commodity Uses: The vast majority of titanium is used in whiteners in the form of titanium oxide. Titanium metal makes up a comparatively small amount of the use for titanium, but as a metal it is used in metal coatings and medical implants.

Close up of Spodumene
March 23, 2017

Spodumene

Mineral origin: Hallman Beam Mine, Cherryville, NC
Primary mineral commodity: Lithium
Uses: batteries for cell phones, laptops, and electric and hybrid vehicles

Close up of Alumina-Zirconia
March 23, 2017

Alumina-Zirconia Abrasive

Mineral: Alumina-Zirconia Abrasive
Mineral Origin: Manufactured in Huntsville, AL (Sample on loan from J.B. Hedrick)
Primary Commodity: Aluminum and zirconia
Primary Commodity Uses: This abrasive is primarily used in metal casting and the foundry process

Filter Total Items: 135
Date published: October 16, 2017

When Ice Yields Fire

When can ice yield fire? That’s the burning question at the heart of one of USGS’s longest-running research programs to date: the exploration of gas hydrates.

Date published: October 11, 2017

EarthWord–Discovery

Eureka often accompanies this EarthWord.

Date published: October 6, 2017

EarthWord–Thermal Maturity

No, this EarthWord isn’t a trait of adult petroleum basins, but it is related to how old they are...

Date published: October 5, 2017

Forecasting the World’s Energy Resources

It is difficult to overstate the importance of energy to the American economy.  Managing this vital sector depends on knowing how many energy resources we have, how many we use and need, and how these resources are transported.

Date published: October 4, 2017

EarthWord–Cracking

This EarthWord is probably what you’ve been doing thanks to our fantastic puns...

Date published: October 3, 2017

EarthWord–Continuous Resources

This EarthWord may sound infinite, but it actually refers to a type of finite resource...

Date published: October 1, 2017

New Uranium Mineral Named for USGS Scientist

Everyone’s seen the news–scientists discover a new species of fly and name it for Beyonce; scientists discover a new species of monkey and auction its name off; etc. Hundreds of new species of animals, plants, and other organisms are discovered and named every year. But did you know that dozens of minerals are discovered every year too?

Date published: September 25, 2017

Helicopter Study to Map Beneath Mountain Watershed Near Crested Butte

Editor:  In the public interest and in accordance with Federal Aviation Administration regulations, the USGS is announcing this low-level airborne project. Your assistance in informing the local communities is appreciated.

Date published: August 21, 2017

Stitching Together the New Digital Geologic Quilt of the United States

A carbonatite here, a glacial moraine there, a zig-zagging fault or two, even a behemoth of a batholith. The geology of the 50 States is an enormous patchwork of varied forms, beautiful in their variance but challenging to present as a single map.

Date published: August 11, 2017

MEDIA ADVISORY: Upcoming Low-Level Flights in Oklahoma to Image Unmapped Faults and Underground Geology

Editor:  In the public interest and in accordance with Federal Aviation Administration regulations, the USGS is announcing this low-level airborne project.  Your assistance in informing the local communities is appreciated.

Date published: August 3, 2017

USGS Assesses Billions of Potential Potash Resources in Ukraine

The Dnieper-Donets Basin of Ukraine could contain an estimated 4.3 billion tons of undiscovered potassium-bearing salt according to a recent U.S. Geological Survey assessment. In addition, previous estimates show that the nearby Pripyat Basin of Belarus could contain 80–200 billion metric tons of undiscovered potash resources.

Date published: July 17, 2017

USGS Releases Three Approaches for Estimating Recovery Factors in Carbon Dioxide Enhanced Oil Recovery

The U.S. Geological Survey has evaluated three methods for estimating how much oil and gas could be produced by injecting carbon dioxide (CO2) into petroleum reservoirs.