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Year Published: 2018

Rare earth element and rare metal inventory of central Asia

Rare earth elements (REE), with their unique physical and chemical properties, are an essential part of modern living. REE have enabled development and manufacture of high-performance materials, processes, and electronic technologies commonly used today in computing and communications, clean energy and transportation, medical treatment and health...

Mihalasky, Mark J.; Tucker, Robert D.; Renaud, Karine; Verstraeten, Ingrid M.
Mihalasky, M.J., Tucker, R.D., Renaud, K., and Verstraeten, I.M., 2018, Rare earth element and rare metal inventory of central Asia: U.S. Geological Survey Fact Sheet 2017–3089, 4 p., https://doi.org/10.3133/fs20173089.

Year Published: 2018

Thermal influences on spontaneous rock dome exfoliation

Rock domes, with their onion-skin layers of exfoliation sheets, are among the most captivating landforms on Earth. Long recognized as integral in shaping domes, the exact mechanism(s) by which exfoliation occurs remains enigmatic, mainly due to the lack of direct observations of natural events. In August 2014, during the hottest days of summer, a...

Collins, Brian D.; Stock, Greg M.; Eppes, Martha C.; Lewis, Scott W.; Corbett, Skye C.; Smith, Joel B.
Collins, B.D., Stock, G.M., Eppes, M.C., Lewis, S., Corbett, S.C., Smith, J.B., 2018, Thermal influences on spontaneous rock dome exfoliation, Nature Communications 9, 762, 12p., doi:10.1038/s41467-017-02728-1.

Year Published: 2018

The Colorado River and its deposits downstream from Grand Canyon in Arizona, California, and Nevada

Understanding the evolution of the Colorado River system has direct implications for (1) the processes and timing of continental-scale river system integration, (2) the formation of iconic landscapes like those in and around Grand Canyon, and (3) the availability of groundwater resources. Spatial patterns in the position and type of Colorado River...

Crow, Ryan S.; Block, Debra L.; Felger, Tracey J.; House, P. Kyle; Pearthree, Philip A.; Gootee, Brian F.; Youberg, Ann M.; Howard, Keith A.; Beard, L. Sue
Crow, R.S., Block, D., Felger, T.J., House, P.K., Pearthree, P.A., Gootee, B.F., Youberg, A.M., Howard, K.A., and Beard, L.S., 2018, The Colorado River and its deposits downstream from Grand Canyon in Arizona, California, and Nevada: U.S. Geological Survey Open-File Report 2018–1005, 6 p., https://doi.org/10.3133/ofr20181005.

Year Published: 2018

Punctuated sediment discharge during early Pliocene birth of the Colorado River: Evidence from regional stratigraphy, sedimentology, and paleontology

The Colorado River in the southwestern U.S. provides an excellent natural laboratory for studying the origins of a continent-scale river system, because deposits that formed prior to and during river initiation are well exposed in the lower river valley and nearby basinal sink. This paper presents a synthesis of regional stratigraphy,...

Dorsey, Rebecca J.; O’Connell, Brennan; McDougall-Reid, Kristin; Homan, Mindy B.
Rebecca J. Dorsey, Brennan O'Connell, Kristin McDougall, and Mindy B. Homan, 2018, Punctuated sediment discharge during early Pliocene birth of the Colorado River; evidence from regional stratigraphy, sedimentology, and paleontology: Sedimentary Geology, v. 363, p. 1-33, https://doi.org/10.1016/j.sedgeo.2017.09.018.

Year Published: 2018

Ore-forming adakitic porphyry produced by fractional crystallization of oxidized basaltic magmas in a subcrustal chamber (Jiamate, East Junggar, NW China)

Adakitic intrusions are supposed to have a close genetic and spatial relationship to porphyry Cu deposits. However, the genesis of adakitic intrusions is still under dispute. Here, we describe newly discovered intrusive complex rocks, which are composed of ore-bearing, layered magnetite-bearing gabbroic and adakitic rocks in Jiamate, East Junggar...

Hong, Tao; Xu, Xing-Wang; Gao, Jun; Peters, Stephen; Zhang, Di; Jielili, Reyaniguli; Xiang, Peng; Li, Hao; Wu, Chu; You, Jun; Liu, Jie; Ke, Qiang
Tao Hong, Xing-Wang Xu, Jun Gao, Stephen G. Peters, Di Zhang, Reyaniguli Jielili, Peng Xiang, Hao Li, Chu Wu, Jun You, Jie Liu, Qiang Ke, 2017, Ore-forming adakitic porphyry produced by fractional crystallization of oxidized basaltic magmas in a subcrustal chamber (Jiamate, East Junggar, NW China). Lithos, https://doi.org/10.1016/j.lithos.2017.11.004.

Year Published: 2018

Networking our science to characterize the state, vulnerabilities, and management opportunities of soil organic matter

Soil organic matter (SOM) supports the Earth's ability to sustain terrestrial ecosystems, provide food and fiber, and retains the largest pool of actively cycling carbon. Over 75% of the soil organic carbon (SOC) in the top meter of soil is directly affected by human land use. Large land areas have lost SOC as a result of land use practices, yet...

Harden, Jennifer W.; Hugelius, Gustaf; Ahlström, Anders; Blankinship, Joseph C.; Bond-Lamberty, Ben; Lawrence, Corey; Loisel, Julie; Malhotra, Avni; Jackson, Robert B.; Ogle, Stephen M.; Phillips, Claire; Ryals, Rebecca; Todd-Brown, Katherine; Vargas, Rodrigo; Vergara, Sintana E.; Cotrufo, M. Francesca; Keiluweit, Marco; Heckman, Katherine; Crow, Susan E.; Silver, Whendee L.; DeLonge, Marcia; Nave, Lucas E.
Harden JW, Hugelius G, Ahlström A, et al. Networking our science to characterize the state, vulnerabilities, and management opportunities of soil organic matter. Glob Change Biol. 2017;00:1–14. https://doi.org/10.1111/gcb.13896

Year Published: 2017

Element migration of pyrites during ductile deformation of the Yuleken porphyry Cu deposit (NW-China)

The strongly deformed Yuleken porphyry Cu deposit (YPCD) occurs in the Kalaxiangar porphyry Cu belt (KPCB), which occupies the central area of the Central Asian Orogenic Belt (CAOB) between the Sawu’er island arc and the Altay Terrane in northern Xinjiang. The YPCD is one of several typical subduction-related deposits in the KPCB, which has...

Hong, Tao; Xu, Xing-Wang; Gao, Jun; Peters, Stephen; Li, Jilei; Cao, Mingjian; Xiang, Peng; Wu, Chu; You, Jun
Tao Hong, Xing-Wang Xu, Jun Gao, Peters, S.G., Jilei Li, Mingjian Cao, Peng Xiang, Chu Wu, and Jun You, 2017, Element migration of pyrites during ductile deformation of the Yuleken porphyry Cu deposit (NW-China): Ore Geology Reviews, , https://doi.org/10.1016/j.oregeorev.2017.10.019.

Year Published: 2017

Control of landslide volume and hazard by glacial stratigraphic architecture, Northwest Washington state, USA

Landslide volumes span many orders of magnitude, but large-volume slides tend to travel farther and consequently can pose a greater hazard. In northwest Washington State, USA, a landscape abounding with landslides big and small, the recent occurrence of the large-volume and tragically deadly State Route 530 (Oso) landslide is a stark reminder of...

Perkins, Jonathan; Reid, Mark E.; Schmidt, Kevin M.
Perkins, J.P., Reid, M.E., and Schmidt, K.M. 2017, Control of landslide volume and hazard by glacial stratigraphic architecture, northwest Washington State, USA: Geology, v. 45, https://doi.org/10.1130/G39691.1

Year Published: 2017

Analysis of the age and paleomagnetic orientation of the Broadwell Mesa Basalt, Bristol Mountains, CA

To add to the regional paleomagnetic data documenting block rotation in eastern California, we determined the age and paleomagnetic rotation of the Broadwell Mesa basalt, a basalt in the Bristol Mountains, CA as part of an effort to constrain the timing and rotation of blocks adjacent to the fault. The east-striking sinistral Broadwell Mesa fault...

Phelps, Geoffrey; Hillhouse, John; Fleck, Robert J.; Miller, David M.; Buesch, David C.; Cyr, Andrew J.; Schmidt, Kevin M.
Phelps, G.A., Hillhouse, J.W., Fleck, R.J., Miller, D.M., Buesch, D.C., Cyr, A., and Schmidt, K.M., 2017, Analysis of the Age and Paleomagnetic Orientation of the Broadwell Mesa Basalt, Bristol Mountains, CA: in R. E. Reynolds, ed. Eastern California Shear Zone (ECSZ) Changes in Latitude, Changes in Altitude, 2017 Desert Symposium Field Guide and Proceedings April 2017

Year Published: 2017

Evaluation of hypotheses for right-lateral displacement of Neogene strata along the San Andreas Fault between Parkfield and Maricopa, California

We used geological field studies and diatom biostratigraphy to test a published hypothesis that Neogene marine siliceous strata in the Maricopa and Parkfield areas, located on opposite sides of the San Andreas Fault, were formerly contiguous and then were displaced by about 80–130 kilometers (km) of right-lateral slip along the fault. In the...

Stanley, Richard G.; Barron, John A.; Powell, Charles L.
Stanley, R.G., Barron, J.A., and Powell, C.L., II, 2017, Evaluation of hypotheses for right-lateral displacement of Neogene strata along the San Andreas Fault between Parkfield and Maricopa, California: U.S. Geological Survey Scientific Investigations Report 2017–5125, 26 p., https://doi.org/10.3133/sir20175125.

Year Published: 2017

Fluorine

Fluorine compounds are essential in numerous chemical and manufacturing processes. Fluorspar is the commercial name for fluorite (isometric CaF2), which is the only fluorine mineral that is mined on a large scale. Fluorspar is used directly as a fluxing material and as an additive in different manufacturing processes. It is the source of fluorine...

Schulz, Klaus J.; DeYoung,, John H.; Seal, Robert R.; Bradley, Dwight C.; Hayes, Timothy S.; Miller, M. Michael; Orris, Greta J.; Piatak, Nadine M.
Hayes, T.S., Miller, M.M., Orris, G.J., and Piatak, N.M., 2017, Fluorine, chap. G of Schulz, K.J., DeYoung, J.H., Jr., Seal, R.R., II, and Bradley, D.C., eds., Critical mineral resources of the United States—Economic and environmental geology and prospects for future supply: U.S. Geological Survey Professional Paper 1802, p. G1–G80, http://doi.org/10.3133/pp1802G.

Year Published: 2017

Platinum-group elements

The platinum-group elements (PGEs)—platinum, palladium, rhodium, ruthenium, iridium, and osmium—are metals that have similar physical and chemical properties and tend to occur together in nature. PGEs are indispensable to many industrial applications but are mined in only a few places. The availability and accessibility of PGEs could be disrupted...

Schulz, Klaus J.; DeYoung,, John H.; Seal, Robert R.; Bradley, Dwight C.; Zientek, Michael L.; Loferski, Patricia J.; Parks, Heather L.; Schulte, Ruth F.; Seal, Robert R.
Zientek, M.L., Loferski, P.J., Parks, H.L., Schulte, R.F., and Seal, R.R., II, 2017, Platinum-group elements, chap. N of Schulz, K.J., DeYoung, J.H., Jr., Seal, R.R., II, and Bradley, D.C., eds., Critical mineral resources of the United States—Economic and environmental geology and prospects for future supply: U.S. Geological Survey Professional Paper 1802, p. N1–N91, https://doi.org/10.3133/pp1802N.