Publications
Filter Total Items: 1492
Isotopic, geochemical, and temporal characterization of Proterozoic basement rocks in the Quitovac region, northwestern Sonora, Mexico: Implications for the reconstruction of the southwestern margin of Laurentia Isotopic, geochemical, and temporal characterization of Proterozoic basement rocks in the Quitovac region, northwestern Sonora, Mexico: Implications for the reconstruction of the southwestern margin of Laurentia
A detailed geochemical characterization of 19 representative Proterozoic basement rocks in the Quitovac region in northwestern Sonora, Mexico, has identified two distinct Paleoproterozoic basement blocks that coincide spatially with the previously proposed Caborca and "North America" blocks. New U-Pb zircon geochronology revises their age ranges, the Caborca (1.78-1.69 Ga) and "North...
Authors
A. Iriondo, W. R. Premo, Luis M. Martinez-Torres, J. R. Budahn, William W. Atkinson, D. F. Siems, B. Guaras-Gonzalez
Use of naturally occurring mercury to determine the importance of cutthroat trout to Yellowstone grizzly bears Use of naturally occurring mercury to determine the importance of cutthroat trout to Yellowstone grizzly bears
Spawning cutthroat trout (Oncorhynchus clarki (Richardson, 1836)) are a potentially important food resource for grizzly bears (Ursus arctos horribilis Ord, 1815) in the Greater Yellowstone Ecosystem. We developed a method to estimate the amount of cutthroat trout ingested by grizzly bears living in the Yellowstone Lake area. The method utilized (i) the relatively high, naturally...
Authors
L.A. Felicetti, C.C. Schwartz, R. O. Rye, K.A. Gunther, J.G. Crock, M.A. Haroldson, L. Waits, C.T. Robbins
Composition, dynamics, and fate of leached dissolved organic matter in terrestrial ecosystems: Results from a decomposition experiment Composition, dynamics, and fate of leached dissolved organic matter in terrestrial ecosystems: Results from a decomposition experiment
Fluxes of dissolved organic matter (DOM) are an important vector for the movement of carbon (C) and nutrients both within and between ecosystems. However, although DOM fluxes from throughfall and through litterfall can be large, little is known about the fate of DOM leached from plant canopies, or from the litter layer into the soil horizon. In this study, our objectives were to...
Authors
C.C. Cleveland, J. C. Neff, A.R. Townsend, E. Hood
Geochemistry of dust in the Exploratory Studies Facility, Yucca Mountain, Nevada Geochemistry of dust in the Exploratory Studies Facility, Yucca Mountain, Nevada
No abstract available.
Authors
Zell E. Peterman, James B. Paces, Leonid A. Neymark, D. Hudson
Summary of Chlorine-36 validation studies at Yucca Mountain, Nevada Summary of Chlorine-36 validation studies at Yucca Mountain, Nevada
No abstract available.
Authors
James B. Paces, Zell E. Peterman, Leonid A. Neymark, G. J. Nimz, M. Gascoyne, Brian D. Marshall
U-series disequilibrium as a test for unsaturated-zone hydrologic models at Yucca Mountain, Nevada U-series disequilibrium as a test for unsaturated-zone hydrologic models at Yucca Mountain, Nevada
No abstract available.
Authors
James B. Paces, Leonid A. Neymark
Reliability of U-Th-Pb dating of secondary silica at Yucca Mountain, Nevada Reliability of U-Th-Pb dating of secondary silica at Yucca Mountain, Nevada
No abstract available.
Authors
Leonid A. Neymark, James B. Paces, Y. V. Amelin
The Rocky Mountain glacial model; the Wind River Range, Wyoming The Rocky Mountain glacial model; the Wind River Range, Wyoming
No abstract available.
Authors
D. E. Dahms, R. D. Hall, Ralph R. Shroba, C. J. Sorenson, E. A. Lynch, M. T. Applegarth
Quaternary vegetation and climate change in the western United States: Developments, perspectives, and prospects Quaternary vegetation and climate change in the western United States: Developments, perspectives, and prospects
This chapter explores the strengths and shortcomings of the major sources of data on Quaternary vegetation and climate change and discusses the use of models as a means to explore past and potential future environmental changes. The flora and major vegetation types of the western United States are present for several million years. Ongoing changes in atmospheric chemistry, climate, and...
Authors
Robert S. Thompson, Sarah Shafer, Laura E. Strickland, Peter K. Van De Water, Katherine H. Anderson
Tectonic framework and Late Cenozoic tectonic history of the northern part of Cyprus: Implications for earthquake hazards and regional tectonics Tectonic framework and Late Cenozoic tectonic history of the northern part of Cyprus: Implications for earthquake hazards and regional tectonics
Located near the triple junction of the African, Arabia, and Eurasian Plate, Cyprus has had an active and complex neotectonic history, which includes devastating historical earthquakes. Investigations into the tectonic framework of the northern part of Cyprus provide important insights into regional tectonism of the Eastern Mediterranean and Middle East. The northern part of Cyprus is...
Authors
Richard W. Harrison, Wayne L. Newell, Hilmi Batihanli, Ioannis Panayides, John McGeehin, Shannon A. Mahan, Ayse Ozhur, Efthymios Tsiolakis, Mehmet Necdet
Pliocene to Holocene Lakes in the Western Great Basin, USA: New perspectives on paleoclimate, landscape dynamics, tectonics, and paleodistribution of aquatic species Pliocene to Holocene Lakes in the Western Great Basin, USA: New perspectives on paleoclimate, landscape dynamics, tectonics, and paleodistribution of aquatic species
No abstract available.
Authors
Marith C. Reheis, Joanna L. Redwine, K. Adams, S. Stine, K. Parker, R. Negrini, R. M. Burke, G. Kurth, John McGeehin, James B. Paces, F. Phillips, Andrei M. Sarna-Wojcicki, J. Smoot
The role of climate and vegetation change in shaping past and future fire regimes in the northwestern US and the implications for ecosystem management The role of climate and vegetation change in shaping past and future fire regimes in the northwestern US and the implications for ecosystem management
Fire is an important part of the disturbance regimes of northwestern US forests and its role in maintaining and altering forest vegetation is evident in the paleoecological record of the region. Long-term reconstructions of Holocene fire regimes, provided by the analysis of charcoal, pollen, and other fire proxies in a network of lake records, indicate that the Pacific Northwest and...
Authors
C. Whitlock, S.L. Shafer, J. Marlon