Publications
Browse more than 160,000 publications authored by our scientists over the past 100+ year history of the USGS. Publications available are: USGS-authored journal articles, series reports, book chapters, other government publications, and more.
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A channel sampling strategy for measurement of mineral modal and chemical composition of drill cores: Application to lower oceanic crustal rocks from IODP Expedition 345 to the Hess Deep rift A channel sampling strategy for measurement of mineral modal and chemical composition of drill cores: Application to lower oceanic crustal rocks from IODP Expedition 345 to the Hess Deep rift
We report a new sampling strategy for collecting representative samples of drill core. By splitting the core with a diamond saw into working and archive halves, the saw cuttings constitute a “channel” sample, the best subsample from which to obtain an average mineralogical and geochemical composition of a core. We apply this procedure to sampling core of the lower oceanic crust in the...
Authors
Robert P. Wintsch, Romain Meyer, David Bish, Ryan T. Deasy, Toshio Nozaka, Carley Johnson
Precaldera mafic magmatism at Long Valley, California: Magma-tectonic siting and incubation of the Great Rhyolite System Precaldera mafic magmatism at Long Valley, California: Magma-tectonic siting and incubation of the Great Rhyolite System
The iconic volcanic center at Long Valley has released ∼820 km3 of rhyolite in at least 110 eruptions. From 2.2 Ma until 0.23 Ma, products were exclusively rhyolitic, and ∼ 700 km3 were high-silica rhyolite severely depleted in Sr, Ba, and Eu. The rhyolitic interval was preceded by an interval from 3.9 to 2.6 Ma with numerous basalt-andesite-dacite eruptions accompanied by no rhyolite at...
Authors
Edward Hildreth, Judith E. Fierstein, Andrew T. Calvert
Magma storage and transport timescales for the 1959 Kīlauea Iki eruption and implications for diffusion chronometry studies using time-series samples versus tephra deposits Magma storage and transport timescales for the 1959 Kīlauea Iki eruption and implications for diffusion chronometry studies using time-series samples versus tephra deposits
Complex crystal cargo in basaltic eruptions has the potential to yield diverse insights on pre- and syn-eruptive timescales of magma storage and transport. Research on eruption products from the 1959 eruption from Kīlauea Iki Crater at Kīlauea volcano (Hawai‘i) demonstrates that time-series samples collected during an eruption can yield a wealth of information not accessible by studying...
Authors
Kendra J. Lynn, Rosalind L. Helz
Evaluating the sensitivity of multi-dimensional model predictions of salmon habitat to the source of remotely sensed river bathymetry Evaluating the sensitivity of multi-dimensional model predictions of salmon habitat to the source of remotely sensed river bathymetry
Multi-dimensional numerical models are fundamental tools for investigating biophysical processes in aquatic ecosystems. Remote sensing techniques increase the feasibility of applying such models at riverscape scales, but tests of model performance on large rivers have been limited. We evaluated the potential to develop two-dimensional (2D) and three-dimensional (3D) hydrodynamic models...
Authors
Lee R. Harrison, Carl J. Legleiter, Vamsi K Sridharana, Peter Dudley, Miles E. Daniels
Diet composition and overlap for adult walleye, lake whitefish, and yellow perch in Green Bay, Lake Michigan Diet composition and overlap for adult walleye, lake whitefish, and yellow perch in Green Bay, Lake Michigan
Interspecific interactions among walleye Sander vitreus, lake whitefish Coregonus clupeaformis, and yellow perch Perca flavescens in Green Bay could influence the population status of each species, but potential trophic interactions are poorly understood. Our objectives were to determine if diet assemblages for each species and diet overlap among species varied spatially and temporally...
Authors
Lucas D. Koeniga, Daniel J. Dembkowski, Scott P. Hansen, Iyob Tsehaye, Tammie J. Paoli, Troy G. Zorn, Daniel A. Isermann
Energy expenditure of fat in a large herbivore is non-linear over winter Energy expenditure of fat in a large herbivore is non-linear over winter
No abstract available.
Authors
Anna C. Ortega, Tayler N. Lasharr, Matthew J. Kauffman, Kevin L. Monteith
Integration of lithofacies and geochemical observation to interpret depositional processes and environments associated with carbon burial during Oceanic Anoxic Event 2 Integration of lithofacies and geochemical observation to interpret depositional processes and environments associated with carbon burial during Oceanic Anoxic Event 2
No abstract available.
Authors
Jason A. Flaum, Justin E. Birdwell, Katherine L. French
Lithologic and geochemical observations of the lower Eagle Ford from the USGS GC-2 core in the East Texas Basin Lithologic and geochemical observations of the lower Eagle Ford from the USGS GC-2 core in the East Texas Basin
No abstract available.
Authors
Jason A. Flaum, Stanley T. Paxton, Justin E. Birdwell, Katherine L. French
Facies identification through lithologic and geochemical observation of the Oceanic Anoxic Event 2 interval in the Cretaceous Western Interior Seaway—Examples from the Rebecca K. Bounds core Facies identification through lithologic and geochemical observation of the Oceanic Anoxic Event 2 interval in the Cretaceous Western Interior Seaway—Examples from the Rebecca K. Bounds core
No abstract available.
Authors
Jason A. Flaum, Jay Kalbas
Using the delta log R method to predict TOC in the Tuscaloosa marine shale, Mississippi, U.S.A. Using the delta log R method to predict TOC in the Tuscaloosa marine shale, Mississippi, U.S.A.
No abstract available.
Authors
Celeste D. Lohr, Matthew D. Merrill
Environmental monitoring for invasive fungal pathogens of ʽŌhiʽa (Metrosideros polymorpha) on the Island of Hawaiʽi Environmental monitoring for invasive fungal pathogens of ʽŌhiʽa (Metrosideros polymorpha) on the Island of Hawaiʽi
The invasive rust Austropuccina psidii was detected in the Hawaiian Islands in 2005 and has become widely established throughout the archipelago in both native and introduced species of Myrtaceae. Initial predictions about the impacts of the fungus on native ʽōhiʽa lehua (Metrosideros polymorpha), a keystone native tree, have not materialized, but there is ongoing concern that...
Authors
Carter T. Atkinson, Kylle Roy
Partnering in search of answers: Seabird die-offs in the Bering and Chukchi Seas Partnering in search of answers: Seabird die-offs in the Bering and Chukchi Seas
Prior to 2015, seabird die-offs in Alaskan waters were rare; they typically occurred in mid-winter, linked to epizootic disease events or above-average ocean temperatures associated with strong El Nino-Southern Oscillation events (Bodenstein et al. 2015, Jones et al. 2019, Romano et al. 2020). Since 2015, the U.S. Fish and Wildlife Service (USFWS) has monitored mortality events that have...
Authors
Robb A. S. Kaler, Gay Sheffield, S Backensto, Jackie Lindsey, T. Jones, J. Parrish, B Ahmasuk, Barbara L. Bodenstein, Robert J. Dusek, Caroline R. Van Hemert, Matthew M. Smith, P Schwalenberg