Jim Budahn
Jim Budahn is a Scientist Emeritus with the Geosciences and Environmental Change Science Center
Science and Products
Filter Total Items: 61
Compelling new evidence for Paleocene dinosaurs in the Ojo Alamo Sandstone, San Juan Basin, New Mexico and Colorado, USA
No abstract available.
Authors
James E. Fassett, Spencer G. Lucas, Robert A. Zielinski, James R. Budahn
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 originally at elevations as high as 3.35 km by til
Authors
R. B. Scott, D. J. Lidke, M. R. Hudson, W. J. Perry, Bruce Bryant, Michael J. Kunk, J. R. Budahn, F.M. Byers
Elemental analyses of modern dust in southern Nevada and California
Selected samples of modern dust collected in marble traps at sites in southern Nevada and California (Reheis and Kihl, 1995; Reheis, 1997) have been analyzed for elemental composition using instrumental neutron activation analysis (INAA) and inductively coupled plasma atomic emission spectroscopy (ICP-AES) and inductively coupled plasma mass spectroscopy (ICP-MS). For information on these analytic
Authors
M. C. Reheis, J. R. Budahn, P. J. Lamothe
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 particles of fly ash, and thus aids prediction of th
Authors
Robert A. Zielinski, James R. Budahn
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 igneous mafic rocks are concentrated in a narrow zone d
Authors
S. Sinigoi, J. E. Quick, A. Mayer, J. Budahn
An empirical equation for modeling rare earth element mineral-mineral partitioning; an application to mantle metasomatism
No abstract available.
Authors
James R. Budahn
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. Olivine basalt crops out farther inboard from the nearby Fairweather transform than plagioclase basalt. 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. The olivine basalt has
Authors
J.R. Riehle, J. R. Budahn, M. A. Lanphere, D. A. Brew
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 refractory peridotite wallrock, reacted with its constitue
Authors
J. E. Nielson, J. R. Budahn, D.M. Unruh, H. G. Wilshire
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% MgO (as normalized, H2O- and CO2-free) and related i
Authors
F. Barker, Brown A. Sutherland, J. R. Budahn, G. Plafker
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 the fault slabs were derived from an oceanic platea
Authors
J.S. Pallister, J. R. Budahn, B. L. Murchey
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 0.24-1.08 ppm, Zr 69-214 ppm, and light REE's slightly
Authors
F. Barker, D. L. Jones, J. R. Budahn, P.J. Coney
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 liquid.-J.A.Z.
Authors
J. R. Budahn
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Filter Total Items: 61
Compelling new evidence for Paleocene dinosaurs in the Ojo Alamo Sandstone, San Juan Basin, New Mexico and Colorado, USA
No abstract available.AuthorsJames E. Fassett, Spencer G. Lucas, Robert A. Zielinski, James R. BudahnActive 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 originally at elevations as high as 3.35 km by tilAuthorsR. B. Scott, D. J. Lidke, M. R. Hudson, W. J. Perry, Bruce Bryant, Michael J. Kunk, J. R. Budahn, F.M. ByersElemental analyses of modern dust in southern Nevada and California
Selected samples of modern dust collected in marble traps at sites in southern Nevada and California (Reheis and Kihl, 1995; Reheis, 1997) have been analyzed for elemental composition using instrumental neutron activation analysis (INAA) and inductively coupled plasma atomic emission spectroscopy (ICP-AES) and inductively coupled plasma mass spectroscopy (ICP-MS). For information on these analyticAuthorsM. C. Reheis, J. R. Budahn, P. J. LamotheRadionuclides 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 particles of fly ash, and thus aids prediction of thAuthorsRobert A. Zielinski, James R. BudahnInfluence 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 igneous mafic rocks are concentrated in a narrow zone dAuthorsS. Sinigoi, J. E. Quick, A. Mayer, J. BudahnAn empirical equation for modeling rare earth element mineral-mineral partitioning; an application to mantle metasomatism
No abstract available.AuthorsJames R. BudahnRare 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. Olivine basalt crops out farther inboard from the nearby Fairweather transform than plagioclase basalt. 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. The olivine basalt hasAuthorsJ.R. Riehle, J. R. Budahn, M. A. Lanphere, D. A. BrewActualistic 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 refractory peridotite wallrock, reacted with its constitueAuthorsJ. E. Nielson, J. R. Budahn, D.M. Unruh, H. G. WilshireBack-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% MgO (as normalized, H2O- and CO2-free) and related iAuthorsF. Barker, Brown A. Sutherland, J. R. Budahn, G. PlafkerPillow 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 the fault slabs were derived from an oceanic plateaAuthorsJ.S. Pallister, J. R. Budahn, B. L. MurcheyOcean 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 0.24-1.08 ppm, Zr 69-214 ppm, and light REE's slightlyAuthorsF. Barker, D. L. Jones, J. R. Budahn, P.J. ConeyEvidence 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 liquid.-J.A.Z.AuthorsJ. R. Budahn