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Publications

Results from our Program’s research and minerals information activities are published in USGS publications series as well as in outside journals.  To follow Minerals Information Periodicals, subscribe to the Mineral Periodicals RSS feed.

Filter Total Items: 2545

Accretionary lapilli: what’s holding them together? 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 on the basaltic glass clasts, and subsequently...
Authors
Paul M. Adams, David K. Lynch, David C. Buesch

Contemporary deformation in the Yakima fold and thrust belt estimated with GPS 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 boundary between northern Oregon and central
Authors
Robert McCaffrey, Robert W. King, Ray E. Wells, Matthew Lancaster, M. Meghan Miller

Potash in 2015 Potash in 2015

No abstract available.
Authors
Stephen M. Jasinski

Pumice in 2015 Pumice in 2015

No abstract available.
Authors
Robert Crangle

Boron in 2015 Boron in 2015

No abstract available.
Authors
Robert Crangle

Rare earths: Market disruption, innovation, and global supply chains Rare earths: Market disruption, innovation, and global supply chains

Rare earths, sometimes called the vitamins of modern materials, captured public attention when their prices increased more than ten-fold in 2010 and 2011. As prices fell between 2011 and 2016, rare earths receded from public view—but less visibly they became a major focus of innovative activity in companies, government laboratories and universities. Geoscientists worked to better...
Authors
Roderick Eggert, Cyrus Wadia, Corby Anderson, Diana Bauer, Fletcher Fields, Lawrence D. Meinert, Patrick Taylor

Isotopically constrained lead sources in fugitive dust from unsurfaced roads in the southeast Missouri mining district 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 characterized heterogeneous end members. End...
Authors
Emitt C. Witt, Michael J. Pribil, John P. Hogan, David Wronkiewicz

Chemical abrasion-SIMS (CA-SIMS) U-Pb dating of zircon from the late Eocene Caetano caldera, Nevada Chemical abrasion-SIMS (CA-SIMS) U-Pb dating of zircon from the late Eocene Caetano caldera, Nevada

Zircon geochronology is a critical tool for establishing geologic ages and time scales of processes in the Earth's crust. However, for zircons compromised by open system behavior, achieving robust dates can be difficult. Chemical abrasion (CA) is a routine step prior to thermal ionization mass spectrometry (TIMS) dating of zircon to remove radiation-damaged parts of grains that may have
Authors
Kathryn E. Watts, Matthew A. Coble, Jorge A. Vazquez, Christopher D. Henry, Joseph P. Colgan, David A. John

Manual hierarchical clustering of regional geochemical data using a Bayesian finite mixture model Manual hierarchical clustering of regional geochemical data using a Bayesian finite mixture model

Interpretation of regional scale, multivariate geochemical data is aided by a statistical technique called “clustering.” We investigate a particular clustering procedure by applying it to geochemical data collected in the State of Colorado, United States of America. The clustering procedure partitions the field samples for the entire survey area into two clusters. The field samples in...
Authors
Karl J. Ellefsen, David Smith
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