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
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 = +3to+10.
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
No abstract available.
Authors
James R. Hein, S.E. Zielinski, Hubert Staudigel, Se-Won Chang, Michelle Greene, M. S. Pringle
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 isotopes provide
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?
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 different in
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
No abstract available.
Authors
H. Ozturk, J. R. Hein
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 reactions in th
Authors
J. R. Hein, A. Koschinsky, P. Halbach, F. T. Manheim, M. Bau, J.-K. Kang, N. Lubick
Precambrian to modern manganese mineralization: Changes in ore type and depositional environment
No abstract available.
Authors
Keith Nicholson, James R. Hein, Bernhard Bühn, Somnath Dasgupta
Comparison of the partitioning behaviours of yttrium, rare earth elements, and titanium between hydrogenetic marine ferromanganese crusts and seawater
In order to evaluate details of the partitioning behaviours of Y, rare earth elements (REEs), and Ti between inorganic metal oxide surfaces and seawater, we studied the distribution of these elements in hydrogenetic marine ferromanganese (Fe-Mn) crusts from the Central Pacific Ocean. Nonphosphatized Fe-Mn crusts display shale-normalized rare earths and yttrium (REYSN) patterns (Y inserted between
Authors
Michael Bau, Andrea Koschinsky, Peter Dulski, James R. Hein
Ferromanganese crusts as indicators for paleoceanographic events in the NE Atlantic
Hydrogenetic ferromanganese crusts reflect the chemical conditions of the sewater from which they formed. Fine-scale geochemical analysis of crust layers in combination with age determinations can therefore be used to investigate paleoceanographic changes which are recorded in geochemical gradients in the crusts. At Tropic seamount (off northwest Africa), uniform crust growth influenced by terrige
Authors
A. Koschinsky, P. Halbach, J. R. Hein, A. Mangini
The zeolite deposits of Greece
Zeolites are present in altered pyroclastic rocks at many localities in Greece, and large deposits of potential economic interest are present in three areas: (1) the Evros region of the province of Thrace in the north-eastern part of the Greek mainland; (2) the islands of Kimolos and Poliegos in the western Aegean; and (3) the island of Samos in the eastern Aegean Sea. The deposits in Thrace are o
Authors
M.G. Stamatakis, A. Hall, J. R. Hein
Global distribution of beryllium isotopes in deep ocean water as derived from Fe-Mn crusts
The direct measurement of the ratio of cosmogenic 10Be (T12= 1.5 Ma) to stable terrigenously sourced 9Be in deep seawater or marine deposits can be used to trace water mass movements and to quantify the incorporation of trace metals into the deep sea. In this study a SIMS-based technique has been used to determine the 10Be9Be ratios of the outermost millimetre of hydrogenetic ferromanganese crusts
Authors
F. Von Blanckenburg, R. K. O'Nions, N.S. Belshaw, A. Gibb, J. R. Hein
Distribution and sources of pre-anthropogenic lead isotopes in deep ocean water from Fe-Mn crusts
The lead isotope composition of ocean water is not well constrained due to contamination by anthropogenic lead. Here the global distribution of lead isotopes in deep ocean water is presented as derived from dated (ca. 100 ka) surface layers of hydrogenetic Fe-Mn crusts. The results indicate that the radiogenic lead in North Atlantic deep water is probably supplied from the continents by river part
Authors
F. Von Blanckenburg, R. K. O'Nions, 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
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 = +3to+10.
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
No abstract available.
Authors
James R. Hein, S.E. Zielinski, Hubert Staudigel, Se-Won Chang, Michelle Greene, M. S. Pringle
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 isotopes provide
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?
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 different in
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
No abstract available.
Authors
H. Ozturk, J. R. Hein
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 reactions in th
Authors
J. R. Hein, A. Koschinsky, P. Halbach, F. T. Manheim, M. Bau, J.-K. Kang, N. Lubick
Precambrian to modern manganese mineralization: Changes in ore type and depositional environment
No abstract available.
Authors
Keith Nicholson, James R. Hein, Bernhard Bühn, Somnath Dasgupta
Comparison of the partitioning behaviours of yttrium, rare earth elements, and titanium between hydrogenetic marine ferromanganese crusts and seawater
In order to evaluate details of the partitioning behaviours of Y, rare earth elements (REEs), and Ti between inorganic metal oxide surfaces and seawater, we studied the distribution of these elements in hydrogenetic marine ferromanganese (Fe-Mn) crusts from the Central Pacific Ocean. Nonphosphatized Fe-Mn crusts display shale-normalized rare earths and yttrium (REYSN) patterns (Y inserted between
Authors
Michael Bau, Andrea Koschinsky, Peter Dulski, James R. Hein
Ferromanganese crusts as indicators for paleoceanographic events in the NE Atlantic
Hydrogenetic ferromanganese crusts reflect the chemical conditions of the sewater from which they formed. Fine-scale geochemical analysis of crust layers in combination with age determinations can therefore be used to investigate paleoceanographic changes which are recorded in geochemical gradients in the crusts. At Tropic seamount (off northwest Africa), uniform crust growth influenced by terrige
Authors
A. Koschinsky, P. Halbach, J. R. Hein, A. Mangini
The zeolite deposits of Greece
Zeolites are present in altered pyroclastic rocks at many localities in Greece, and large deposits of potential economic interest are present in three areas: (1) the Evros region of the province of Thrace in the north-eastern part of the Greek mainland; (2) the islands of Kimolos and Poliegos in the western Aegean; and (3) the island of Samos in the eastern Aegean Sea. The deposits in Thrace are o
Authors
M.G. Stamatakis, A. Hall, J. R. Hein
Global distribution of beryllium isotopes in deep ocean water as derived from Fe-Mn crusts
The direct measurement of the ratio of cosmogenic 10Be (T12= 1.5 Ma) to stable terrigenously sourced 9Be in deep seawater or marine deposits can be used to trace water mass movements and to quantify the incorporation of trace metals into the deep sea. In this study a SIMS-based technique has been used to determine the 10Be9Be ratios of the outermost millimetre of hydrogenetic ferromanganese crusts
Authors
F. Von Blanckenburg, R. K. O'Nions, N.S. Belshaw, A. Gibb, J. R. Hein
Distribution and sources of pre-anthropogenic lead isotopes in deep ocean water from Fe-Mn crusts
The lead isotope composition of ocean water is not well constrained due to contamination by anthropogenic lead. Here the global distribution of lead isotopes in deep ocean water is presented as derived from dated (ca. 100 ka) surface layers of hydrogenetic Fe-Mn crusts. The results indicate that the radiogenic lead in North Atlantic deep water is probably supplied from the continents by river part
Authors
F. Von Blanckenburg, R. K. O'Nions, J. R. Hein