James Hein
zation
Geologist Emeritus with the USGS Pacific Coastal and Marine Science Center
Science and Products
Filter Total Items: 167
New constraints on the sources and behavior of neodymium and hafnium in seawater from Pacific Ocean ferromanganese crusts New constraints on the sources and behavior of neodymium and hafnium in seawater from Pacific Ocean ferromanganese crusts
The behavior of dissolved Hf in the marine environment is not well understood due to the lack of direct seawater measurements of Hf isotopes and the limited number of Hf isotope time-series obtained from ferromanganese crusts. In order to place better constraints on input sources and develop further applications, a combined Nd-Hf isotope time-series study of five Pacific ferromanganese...
Authors
T. van de Flierdt, M. Frank, D.-C. Lee, A. N. Halliday, B.C. Reynolds, J.R. Hein
The global variation in the iron isotope composition of marine hydrogenetic ferromanganese deposits: Implications for seawater chemistry? The global variation in the iron isotope composition of marine hydrogenetic ferromanganese deposits: Implications for seawater chemistry?
The iron (Fe) isotope compositions of 37 hydrogenetic ferromanganese deposits from various oceans have been analysed by MC-ICPMS; they permit the construction of a global map of Fe isotopic values. The isotopic compositions range between -1.2 and -0.1??? in ??57FeIRMM14. Averages for the Atlantic and the Pacific are -0.41 and -0.88???, but their standard deviations are identical (0.27, 1...
Authors
S. Levasseur, M. Frank, J.R. Hein, A. N. Halliday
Tracing the history of submarine hydrothermal inputs and the significance of hydrothermal hafnium for the seawater budget - A combined Pb-Hf-Nd isotope approach Tracing the history of submarine hydrothermal inputs and the significance of hydrothermal hafnium for the seawater budget - A combined Pb-Hf-Nd isotope approach
Secular variations in the Pb isotopic composition of a mixed hydrogenous-hydrothermal ferromanganese crust from the Bauer Basin in the eastern Equatorial Pacific provide clear evidence for changes in hydrothermal contributions during the past 7 Myr. The nearby Galapagos Rise spreading center provided a strong hydrothermal flux prior to 6.5 Ma. After 6.5 Ma, the Pb became stepwise more...
Authors
T. van de Flierdt, M. Frank, A. N. Halliday, J.R. Hein, B. Hattendorf, D. Gunther, P.W. Kubik
Deep and bottom water export from the Southern Ocean to the Pacific over the past 38 million years Deep and bottom water export from the Southern Ocean to the Pacific over the past 38 million years
The application of radiogenic isotopes to the study of Cenozoic circulation patterns in the South Pacific Ocean has been hampered by the fact that records from only equatorial Pacific deep water have been available. We present new Pb and Nd isotope time series for two ferromanganese crusts that grew from equatorial Pacific bottom water (D137-01, "Nova," 7219 m water depth) and southwest...
Authors
T. van de Flierdt, M. Frank, A. N. Halliday, J.R. Hein, B. Hattendorf, D. Gunther, P.W. Kubik
Cenozoic marine geochemistry of thallium deduced from isotopic studies of ferromanganese crusts and pelagic sediments Cenozoic marine geochemistry of thallium deduced from isotopic studies of ferromanganese crusts and pelagic sediments
Cenozoic records of Tl isotope compositions recorded by ferromanganese (Fe-Mn) crusts have been obtained. Such records are of interest because recent growth surfaces of Fe-Mn crusts display a nearly constant Tl isotope fractionation relative to seawater. The time-series data are complemented by results for bulk samples and leachates of various marine sediments. Oxic pelagic sediments and...
Authors
M. Rehkamper, M. Frank, J.R. Hein, A. Halliday
Geochemistry of Permian rocks from the margins of the Phosphoria Basin: Lakeridge core, western Wyoming Geochemistry of Permian rocks from the margins of the Phosphoria Basin: Lakeridge core, western Wyoming
The Permian Phosphoria Formation and interbedded units of the Park City Formation and Shedhorn Sandstone in western Wyoming represent deposition along a carbonate ramp at the eastern margin of the Phosphoria Basin, with portions of the Phosphoria units reflecting periods of upwelling and widespread phosphogenesis. Thickness-weighted slab-samples of these units were collected at a maximum...
Authors
Robert B. Perkins, Brandie McIntyre, James R. Hein, David Z. Piper
By
Geology, Energy, and Minerals Mission Area, Energy Resources Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Groundwater and Streamflow Information Program, Pacific Coastal and Marine Science Center, Geology, Minerals, Energy, and Geophysics Science Center
Science and Products
Filter Total Items: 167
New constraints on the sources and behavior of neodymium and hafnium in seawater from Pacific Ocean ferromanganese crusts New constraints on the sources and behavior of neodymium and hafnium in seawater from Pacific Ocean ferromanganese crusts
The behavior of dissolved Hf in the marine environment is not well understood due to the lack of direct seawater measurements of Hf isotopes and the limited number of Hf isotope time-series obtained from ferromanganese crusts. In order to place better constraints on input sources and develop further applications, a combined Nd-Hf isotope time-series study of five Pacific ferromanganese...
Authors
T. van de Flierdt, M. Frank, D.-C. Lee, A. N. Halliday, B.C. Reynolds, J.R. Hein
The global variation in the iron isotope composition of marine hydrogenetic ferromanganese deposits: Implications for seawater chemistry? The global variation in the iron isotope composition of marine hydrogenetic ferromanganese deposits: Implications for seawater chemistry?
The iron (Fe) isotope compositions of 37 hydrogenetic ferromanganese deposits from various oceans have been analysed by MC-ICPMS; they permit the construction of a global map of Fe isotopic values. The isotopic compositions range between -1.2 and -0.1??? in ??57FeIRMM14. Averages for the Atlantic and the Pacific are -0.41 and -0.88???, but their standard deviations are identical (0.27, 1...
Authors
S. Levasseur, M. Frank, J.R. Hein, A. N. Halliday
Tracing the history of submarine hydrothermal inputs and the significance of hydrothermal hafnium for the seawater budget - A combined Pb-Hf-Nd isotope approach Tracing the history of submarine hydrothermal inputs and the significance of hydrothermal hafnium for the seawater budget - A combined Pb-Hf-Nd isotope approach
Secular variations in the Pb isotopic composition of a mixed hydrogenous-hydrothermal ferromanganese crust from the Bauer Basin in the eastern Equatorial Pacific provide clear evidence for changes in hydrothermal contributions during the past 7 Myr. The nearby Galapagos Rise spreading center provided a strong hydrothermal flux prior to 6.5 Ma. After 6.5 Ma, the Pb became stepwise more...
Authors
T. van de Flierdt, M. Frank, A. N. Halliday, J.R. Hein, B. Hattendorf, D. Gunther, P.W. Kubik
Deep and bottom water export from the Southern Ocean to the Pacific over the past 38 million years Deep and bottom water export from the Southern Ocean to the Pacific over the past 38 million years
The application of radiogenic isotopes to the study of Cenozoic circulation patterns in the South Pacific Ocean has been hampered by the fact that records from only equatorial Pacific deep water have been available. We present new Pb and Nd isotope time series for two ferromanganese crusts that grew from equatorial Pacific bottom water (D137-01, "Nova," 7219 m water depth) and southwest...
Authors
T. van de Flierdt, M. Frank, A. N. Halliday, J.R. Hein, B. Hattendorf, D. Gunther, P.W. Kubik
Cenozoic marine geochemistry of thallium deduced from isotopic studies of ferromanganese crusts and pelagic sediments Cenozoic marine geochemistry of thallium deduced from isotopic studies of ferromanganese crusts and pelagic sediments
Cenozoic records of Tl isotope compositions recorded by ferromanganese (Fe-Mn) crusts have been obtained. Such records are of interest because recent growth surfaces of Fe-Mn crusts display a nearly constant Tl isotope fractionation relative to seawater. The time-series data are complemented by results for bulk samples and leachates of various marine sediments. Oxic pelagic sediments and...
Authors
M. Rehkamper, M. Frank, J.R. Hein, A. Halliday
Geochemistry of Permian rocks from the margins of the Phosphoria Basin: Lakeridge core, western Wyoming Geochemistry of Permian rocks from the margins of the Phosphoria Basin: Lakeridge core, western Wyoming
The Permian Phosphoria Formation and interbedded units of the Park City Formation and Shedhorn Sandstone in western Wyoming represent deposition along a carbonate ramp at the eastern margin of the Phosphoria Basin, with portions of the Phosphoria units reflecting periods of upwelling and widespread phosphogenesis. Thickness-weighted slab-samples of these units were collected at a maximum...
Authors
Robert B. Perkins, Brandie McIntyre, James R. Hein, David Z. Piper
By
Geology, Energy, and Minerals Mission Area, Energy Resources Program, Mineral Resources Program, National Laboratories Program, Science and Decisions Center, Groundwater and Streamflow Information Program, Pacific Coastal and Marine Science Center, Geology, Minerals, Energy, and Geophysics Science Center