Jim Budahn
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Active evaporite tectonics and collapse in the Eagle River valley and the southwestern flank of the White River uplift, Colorado
This field trip presents field evidence for Neogene evaporite tectonism, dissolution of evaporates, and related collapse in Eagle River valley and along the southwestern flank of the White River uplift. In the Eagle collapse center, Pennsylvanian evaporite flowed to form anticlinal diapirs, dissolved, and disrupted a lower Miocene basaltic plateau...
Scott, R. B.; Lidke, D.J.; Hudson, M.R.; Perry, W.J.; Bryant, Bruce; Kunk, Michael J.; Budahn, J. R.; Byers, F.M. Radionuclides in fly ash and bottom ash: Improved characterization based on radiography and low energy gamma-ray spectrometry
Two radiation-based techniques for determining the distribution and relative abundance of radionuclides are described, and applied to a suite of fly ash and bottom ash samples from a Kentucky power plant. The technique of fission-track radiography provides new observations of the variety of uranium hosts and of uranium distribution in individual...
Zielinski, Robert A.; Budahn, James R.
Geologic map, petrochemistry, and geochronology of the Precambrian rocks of the Bull Camp Peak Quadrangle, Albany County, Wyoming
Snyder, G.L.; Budahn, J. R.; Nealey, L.D.; Bartel, A.J.; Ludwig, K. R.; Nicholls, J.W. Influence of stretching and density contrasts on the chemical evolution of continental magmas: An example from the Ivrea-Verbano Zone
The southern Ivrea-Verbano Zone of the Italian Western Alps contains a huge mafic complex that intruded high-grade metamorphic rocks while they were resident in the lower crust. Geologic mapping and chemical variations of the igneous body were used to study the evolution of underplated crust. Slivers of crustal rocks (septa) interlayered with...
Sinigoi, S.; Quick, J.E.; Mayer, A.; Budahn, J.
An empirical equation for modeling rare earth element mineral-mineral partitioning; an application to mantle metasomatism
Budahn, James R. Rare earth element contents and multiple mantle sources of the transform-related Mount Edgecumbe basalts, southeastern Alaska
Pleistocene basalt of the Mount Edgecumbe volcanic field (MEF) is subdivided into a plagioclase type and an olivine type. Th/La ratios of plagioclase basalt are similar to those of mid-ocean-ridge basalt (MORB), whereas those of olivine basalt are of continental affinity. Rare earth element (REE) contents of the olivine basalt, which resemble...
Riehle, J.R.; Budahn, J. R.; Lanphere, M. A.; Brew, D.A. Actualistic models of mantle metasomatism documented in a composite xenolith from Dish Hill, California
Major and trace-element whole rock and mineral variations in composite hornblendite-peridotite xenolith Ba-2-1, from Dish Hill, CA, are due to a single event of metasomatism in the mantle. The hornblendite is the crystallized selvage of a dike conduit charged with incompatible-element-enriched hydrous mafic magma. The magma infiltrated the...
Nielson, J.E.; Budahn, J. R.; Unruh, D.M.; Wilshire, H.G. Back-arc with frontal-arc component origin of Triassic Karmutsen basalt, British Columbia, Canada
The largely basaltic, ???4.5-6.2-km-thick, Middle to Upper Triassic Karmutsen Formation is a prominent part of the Wrangellian sequence. Twelve analyses of major and minor elements of representative samples of pillowed and massive basalt flows and sills from Queen Charlotte and Vancouver Islands are ferrotholeiites that show a range of 10.2-3.8%...
Barker, F.; Sutherland, Brown A.; Budahn, J. R.; Plafker, G. Pillow basalts of the Angayucham terrane: oceanic plateau and island crust accreted to the Brooks Range
The Angayucham Mountains (north margin of the Yukon-Koyukuk province) are made up of an imbricate stack of four to eight east-west trending, steeply dipping, fault slabs composed of Paleozoic, Middle to Late Triassic, and Early Jurassic oceanic upper crustal rocks. Field relations and geochemical characteristics of the basaltic rocks suggest that...
Pallister, J.S.; Budahn, J. R.; Murchey, B.L. Ocean plateau-seamount origin of basaltic rocks, Angayucham terrane, central Alaska
The Angayucham terrane of north-central Alaska (immediately S of the Brooks Range) is a large (ca. 500 km E-W), allochthonous complex of Devonian to Lower Jurassic pillow basalt, diabase sills, gabbro plutons, and chert. The mafic rocks are transitional normal-to-enriched, mid-ocean-ridge (MORB) type tholeiites (TiO2 1.2-3.4%, Nb 7-23 ppm, Ta 0.24...
Barker, F.; Jones, D.L.; Budahn, J. R.; Coney, P.J. Evidence for equilibrium conditions during the partitioning of nickel between olivine and komatiite liquids.
Olivine-liquid partition coefficients for Ni(DNi), calculated from Ni vs MgO abundance variations in komatiite series basalts, compare favourably with experimentally determined values, if Ni variations in olivine-controlled basalts can be modelled with an equation that assumes equilibrium between the entire olivine crystal and its coexisting...
Budahn, J. R.
Trace-element geochemistry of postorogenic granites from the northeastern Arabian Shield, Kingdom of Saudi Arabia
Concentrations determined for all of the trace elements included in this study of postorogenic granites from the northeastern Arabian Shield are best described by log-normal distributions. The trace elements are divided into two groups: (1) compatible lithophile and siderophile elements (strontium, cobalt, scandium, manganese, europium, and...
Stuckless, John S.; Knight, R.J.; VanTrump, G.; Budahn, J. R.