James Hein
zation
Geologist Emeritus with the USGS Pacific Coastal and Marine Science Center
Science and Products
Filter Total Items: 167
The Hf isotopic composition of ferromanganese nodules and crusts and hydrothermal manganese deposits: Implications for seawater Hf The Hf isotopic composition of ferromanganese nodules and crusts and hydrothermal manganese deposits: Implications for seawater Hf
We present Hf and Pb isotopic data, and chemical compositions of the outermost layers of marine ferromanganese deposits of different types (hydrogenous and hydrothermal) with a worldwide distribution. The Hf isotopic compositions display a broad range and refine previously reported regional differences as follows: Atlantic Ocean ɛHf = −4to+2, Indian Ocean ɛHf = +2to+4, Pacific Ocean ɛHf...
Authors
L. V. Godfrey, D.-C. Lee, W. F. Sangrey, A. N. Halliday, V. J. M. Salters, James R. Hein, W. M. White
Composition of Co-rich ferromanganese crusts and substrate rocks from the NW Marshall Islands and international waters to the north, Tunes 6 cruise Composition of Co-rich ferromanganese crusts and substrate rocks from the NW Marshall Islands and international waters to the north, Tunes 6 cruise
No abstract available.
Authors
James R. Hein, S.E. Zielinski, Hubert Staudigel, Se-Won Chang, Michelle Greene, M. S. Pringle
Iron and manganese oxide mineralization in the Pacific Iron and manganese oxide mineralization in the Pacific
Iron, manganese, and iron-manganese deposits occur in nearly all geomorphologic and tectonic environments in the ocean basins and form by one or more of four processes: (1) hydrogenetic precipitation from cold ambient seawater, (2) precipitation from hydrothermal fluids, (3) precipitation from sediment pore waters that have been modified from bottom water compositions by diagenetic...
Authors
J.R. Hein, A. Koschinsky, P. Halbach, F.T. Manheim, M. Bau, J.-K. Kang, N. Lubick
Evolution of Nd and Pb isotopes in Central Pacific seawater from ferromanganese crusts Evolution of Nd and Pb isotopes in Central Pacific seawater from ferromanganese crusts
Hydrogenetic ferromanganese crusts incorporate elements from ambient seawater during their growth on seamounts. By analysing Nd, Pb and Be isotope profiles within crusts it is possible to reconstruct seawater tracer histories. Depth profiles of 10Be/9Be ratios in three Pacific ferromanganese crusts have been used to obtain growth rates which are between 1.4 and 3.8 mm/Ma. Nd and Pb...
Authors
H.F. Ling, K.W. Burton, R. K. O’Nions, B.S. Kamber, F. Von Blanckenburg, A.J. Gibb, J.R. Hein
238U-234U-230Th disequilibrium in hydrogenous oceanic Fe-Mn crusts: Palaeoceanographic record or diagenetic alteration? 238U-234U-230Th disequilibrium in hydrogenous oceanic Fe-Mn crusts: Palaeoceanographic record or diagenetic alteration?
A detailed TIMS study of (234Uexc/238U), (230Th/232Th), and Th/U ratios have been performed on the outermost margin of ten hydrogenous FeMn crusts from the equatorial Pacific Ocean and west-central Indian Ocean.Th/U concentration ratios generally decrease from the crust's surface down to 0.5-1 mm depth and growth rates estimated by uranium and thorium isotope ratios are significantly...
Authors
F. Chabaux, R. K. O’Nions, A.S. Cohen, J.R. Hein
Mineralogy and stable isotopes of black shale-hosted manganese ores, Southwestern Taurides, Turkey Mineralogy and stable isotopes of black shale-hosted manganese ores, Southwestern Taurides, Turkey
No abstract available.
Authors
H. Ozturk, J.R. Hein
Science and Products
Filter Total Items: 167
The Hf isotopic composition of ferromanganese nodules and crusts and hydrothermal manganese deposits: Implications for seawater Hf The Hf isotopic composition of ferromanganese nodules and crusts and hydrothermal manganese deposits: Implications for seawater Hf
We present Hf and Pb isotopic data, and chemical compositions of the outermost layers of marine ferromanganese deposits of different types (hydrogenous and hydrothermal) with a worldwide distribution. The Hf isotopic compositions display a broad range and refine previously reported regional differences as follows: Atlantic Ocean ɛHf = −4to+2, Indian Ocean ɛHf = +2to+4, Pacific Ocean ɛHf...
Authors
L. V. Godfrey, D.-C. Lee, W. F. Sangrey, A. N. Halliday, V. J. M. Salters, James R. Hein, W. M. White
Composition of Co-rich ferromanganese crusts and substrate rocks from the NW Marshall Islands and international waters to the north, Tunes 6 cruise Composition of Co-rich ferromanganese crusts and substrate rocks from the NW Marshall Islands and international waters to the north, Tunes 6 cruise
No abstract available.
Authors
James R. Hein, S.E. Zielinski, Hubert Staudigel, Se-Won Chang, Michelle Greene, M. S. Pringle
Iron and manganese oxide mineralization in the Pacific Iron and manganese oxide mineralization in the Pacific
Iron, manganese, and iron-manganese deposits occur in nearly all geomorphologic and tectonic environments in the ocean basins and form by one or more of four processes: (1) hydrogenetic precipitation from cold ambient seawater, (2) precipitation from hydrothermal fluids, (3) precipitation from sediment pore waters that have been modified from bottom water compositions by diagenetic...
Authors
J.R. Hein, A. Koschinsky, P. Halbach, F.T. Manheim, M. Bau, J.-K. Kang, N. Lubick
Evolution of Nd and Pb isotopes in Central Pacific seawater from ferromanganese crusts Evolution of Nd and Pb isotopes in Central Pacific seawater from ferromanganese crusts
Hydrogenetic ferromanganese crusts incorporate elements from ambient seawater during their growth on seamounts. By analysing Nd, Pb and Be isotope profiles within crusts it is possible to reconstruct seawater tracer histories. Depth profiles of 10Be/9Be ratios in three Pacific ferromanganese crusts have been used to obtain growth rates which are between 1.4 and 3.8 mm/Ma. Nd and Pb...
Authors
H.F. Ling, K.W. Burton, R. K. O’Nions, B.S. Kamber, F. Von Blanckenburg, A.J. Gibb, J.R. Hein
238U-234U-230Th disequilibrium in hydrogenous oceanic Fe-Mn crusts: Palaeoceanographic record or diagenetic alteration? 238U-234U-230Th disequilibrium in hydrogenous oceanic Fe-Mn crusts: Palaeoceanographic record or diagenetic alteration?
A detailed TIMS study of (234Uexc/238U), (230Th/232Th), and Th/U ratios have been performed on the outermost margin of ten hydrogenous FeMn crusts from the equatorial Pacific Ocean and west-central Indian Ocean.Th/U concentration ratios generally decrease from the crust's surface down to 0.5-1 mm depth and growth rates estimated by uranium and thorium isotope ratios are significantly...
Authors
F. Chabaux, R. K. O’Nions, A.S. Cohen, J.R. Hein
Mineralogy and stable isotopes of black shale-hosted manganese ores, Southwestern Taurides, Turkey Mineralogy and stable isotopes of black shale-hosted manganese ores, Southwestern Taurides, Turkey
No abstract available.
Authors
H. Ozturk, J.R. Hein