James Hein
zation
Geologist Emeritus with the USGS Pacific Coastal and Marine Science Center
Science and Products
Filter Total Items: 166
Seamount characteristics and mine-site model applied to exploration- and mining-lease-block selection for cobalt-rich ferromanganese crusts
Regulations are being developed through the International Seabed Authority (ISBA) for the exploration and mining of cobalt-rich ferromanganese crusts. This paper lays out geologic and geomorphologic criteria that can be used to determine the size and number of exploration and mine-site blocks that will be the focus of much discussion within the ISBA Council deliberations. The surface areas of 155
Authors
James R. Hein, Tracey A. Conrad, Rachel E. Dunham
New constraints on the Pb and Nd isotopic evolution of NE Atlantic water masses
Time series of lead (Pb) and neodymium (Nd) isotope compositions were measured on three ferromanganese crusts recording the evolution of NE Atlantic water masses over the past 15 Ma. The crusts are distributed along a depth profile (∼700–4600 m) comprising the present-day depths of Mediterranean Outflow Water and North East Atlantic Deep Water. A pronounced increase of the 206Pb/204Pb in the two d
Authors
S. B. Muinos, M. Frank, C. Maden, J. R. Hein, T. van de Flierdt, S. M. Lebreiro, L. Gaspar, J. H. Monteiro, A. N. Halliday
Metalliferous sediment and a silica-hematite deposit within the Blanco fracture zone, Northeast Pacific
A Tiburon ROV dive within the East Blanco Depression (EBD) increased the mapped extent of a known hydrothermal field by an order of magnitude. In addition, a unique opal-CT (cristobalite-tridymite)-hematite mound was discovered, and mineralized sediments and rock were collected and analyzed. Silica-hematite mounds have not previously been found on the deep ocean floor. The light-weight rock of the
Authors
J. R. Hein, D. A. Clague, R.A. Koski, R.W. Embley, R.E. Dunham
Seawater osmium isotope evidence for a middle Miocene flood basalt event in ferromanganese crust records
Three ferromanganese crusts from the northeast, northwest and central Atlantic were re-dated using osmium (Os) isotope stratigraphy and yield ages from middle Miocene to the present. The three Os isotope records do not show evidence for growth hiatuses. The reconstructed Os isotope-based growth rates for the sections older than 10??Ma are higher than those determined previously by the combined ber
Authors
V. Klemm, M. Frank, S. Levasseur, A. N. Halliday, J. R. Hein
Diffuse flow hydrothermal manganese mineralization along the active Mariana and southern Izu-Bonin arc system, western Pacific
Abundant ferromanganese oxides were collected along 1200 km of the active Izu-Bonin-Mariana arc system. Chemical compositions and mineralogy show that samples were collected from two deposit types: Fe-Mn crusts of mixed hydrogenetic/hydrothermal origin and hydrothermal Mn oxide deposits; this paper addresses only the second type. Mn oxides cement volcaniclastic and biogenic sandstone and breccia l
Authors
J. R. Hein, M. S. Schulz, R.E. Dunham, R.J. Stern, S.H. Bloomer
Deep-sea mining: Integrating geology, oceanography, and engineering
[No abstract available]
Authors
F.M. Meyer, P.E. Halbach, P.N. Martens, J. R. Hein, S. Scott
Platinum group elements and gold in ferromanganese crusts from Afanasiy-Nikitin seamount, equatorial Indian Ocean: Sources and fractionation
The major element relationships in ferromanganese (Fe-Mn) crusts from Afanasiy-Nikitin seamount (ANS), eastern equatorial Indian Ocean, appear to be atypical. High positive correlations (r = 0.99) between Mn/Co and Fe/Co ratios, and lack of correlation of those ratios with Co, Ce, and Ce/Co, indicate that the ANS Fe-Mn crusts are distinct from Pacific seamount Fe-Mn crusts, and reflect region-spec
Authors
V.K. Banakar, J. R. Hein, R.P. Rajani, A.R. Chodankar
Lithium contents and isotopic compositions of ferromanganese deposits from the global ocean
To test the feasibility of using lithium isotopes in marine ferromanganese deposits as an indicator of paleoceanographic conditions and seawater composition, we analyzed samples from a variety of tectonic environments in the global ocean. Hydrogenetic, hydrothermal, mixed hydrogenetic–hydrothermal, and hydrogenetic–diagenetic samples were subjected to a two-step leaching and dissolution procedure
Authors
L.-H. Chan, J. R. Hein
Barite-forming environments along a rifted continental margin, Southern California Borderland
The Southern California Continental Borderland (SCCB) is part of the broad San Andreas transform-fault plate boundary that consists of a series of fault-bounded, petroleum-generating basins. The SCCB has high heat flow and geothermal gradients produced by thinned continental crust and Neogene volcanism. Barite deposits in the SCCB occur along faults.Barite samples from two sea-cliff sites and four
Authors
James R. Hein, Robert A. Zierenberg, J. Barry Maynard, Mark D. Hannington
Quantitative x-ray diffraction mineralogy of Los Angeles basin core samples
This report contains X-ray diffraction (XRD) analysis of mineralogy for 81 sediment samples from cores taken from three drill holes in the Los Angeles Basin in 2000-2001. We analyzed 26 samples from Pier F core, 29 from Pier C core, and 26 from the Webster core. These three sites provide an offshore-onshore record across the Southern California coastal zone. This report is designed to be a data re
Authors
James R. Hein, Brandie R. McIntyre, Brian D. Edwards, Orion I. Lakota
Long-term eruptive activity at a submarine arc volcano
Three-quarters of the Earth's volcanic activity is submarine, located mostly along the mid-ocean ridges, with the remainder along intraoceanic arcs and hotspots at depths varying from greater than 4,000 m to near the sea surface. Most observations and sampling of submarine eruptions have been indirect, made from surface vessels or made after the fact. We describe here direct observations and sampl
Authors
R.W. Embley, W.W. Chadwick, E.T. Baker, D.A. Butterfield, J.A. Resing, Cornel E. J. de Ronde, V. Tunnicliffe, J.E. Lupton, S.K. Juniper, K.H. Rubin, R.J. Stern, G.T. Lebon, K.-I. Nakamura, S.G. Merle, J. R. Hein, D.A. Wiens, Y. Tamura
Methanogenic calcite, 13C-depleted bivalve shells, and gas hydrate from a mud volcano offshore southern California
Methane and hydrogen sulfide vent from a cold seep above a shallowly buried methane hydrate in a mud volcano located 24 km offshore southern California in?? 800 m of water. Bivalves, authigenic calcite, and methane hydrate were recovered in a 2.1 m piston core. Aragonite shells of two bivalve species are unusually depleted in 13C (to -91??? ??13C), the most 13C-depleted shells of marine macrofauna
Authors
J. R. Hein, W. R. Normark, B.R. McIntyre, T.D. Lorenson, C.L. Powell
Science and Products
Filter Total Items: 166
Seamount characteristics and mine-site model applied to exploration- and mining-lease-block selection for cobalt-rich ferromanganese crusts
Regulations are being developed through the International Seabed Authority (ISBA) for the exploration and mining of cobalt-rich ferromanganese crusts. This paper lays out geologic and geomorphologic criteria that can be used to determine the size and number of exploration and mine-site blocks that will be the focus of much discussion within the ISBA Council deliberations. The surface areas of 155
Authors
James R. Hein, Tracey A. Conrad, Rachel E. Dunham
New constraints on the Pb and Nd isotopic evolution of NE Atlantic water masses
Time series of lead (Pb) and neodymium (Nd) isotope compositions were measured on three ferromanganese crusts recording the evolution of NE Atlantic water masses over the past 15 Ma. The crusts are distributed along a depth profile (∼700–4600 m) comprising the present-day depths of Mediterranean Outflow Water and North East Atlantic Deep Water. A pronounced increase of the 206Pb/204Pb in the two d
Authors
S. B. Muinos, M. Frank, C. Maden, J. R. Hein, T. van de Flierdt, S. M. Lebreiro, L. Gaspar, J. H. Monteiro, A. N. Halliday
Metalliferous sediment and a silica-hematite deposit within the Blanco fracture zone, Northeast Pacific
A Tiburon ROV dive within the East Blanco Depression (EBD) increased the mapped extent of a known hydrothermal field by an order of magnitude. In addition, a unique opal-CT (cristobalite-tridymite)-hematite mound was discovered, and mineralized sediments and rock were collected and analyzed. Silica-hematite mounds have not previously been found on the deep ocean floor. The light-weight rock of the
Authors
J. R. Hein, D. A. Clague, R.A. Koski, R.W. Embley, R.E. Dunham
Seawater osmium isotope evidence for a middle Miocene flood basalt event in ferromanganese crust records
Three ferromanganese crusts from the northeast, northwest and central Atlantic were re-dated using osmium (Os) isotope stratigraphy and yield ages from middle Miocene to the present. The three Os isotope records do not show evidence for growth hiatuses. The reconstructed Os isotope-based growth rates for the sections older than 10??Ma are higher than those determined previously by the combined ber
Authors
V. Klemm, M. Frank, S. Levasseur, A. N. Halliday, J. R. Hein
Diffuse flow hydrothermal manganese mineralization along the active Mariana and southern Izu-Bonin arc system, western Pacific
Abundant ferromanganese oxides were collected along 1200 km of the active Izu-Bonin-Mariana arc system. Chemical compositions and mineralogy show that samples were collected from two deposit types: Fe-Mn crusts of mixed hydrogenetic/hydrothermal origin and hydrothermal Mn oxide deposits; this paper addresses only the second type. Mn oxides cement volcaniclastic and biogenic sandstone and breccia l
Authors
J. R. Hein, M. S. Schulz, R.E. Dunham, R.J. Stern, S.H. Bloomer
Deep-sea mining: Integrating geology, oceanography, and engineering
[No abstract available]
Authors
F.M. Meyer, P.E. Halbach, P.N. Martens, J. R. Hein, S. Scott
Platinum group elements and gold in ferromanganese crusts from Afanasiy-Nikitin seamount, equatorial Indian Ocean: Sources and fractionation
The major element relationships in ferromanganese (Fe-Mn) crusts from Afanasiy-Nikitin seamount (ANS), eastern equatorial Indian Ocean, appear to be atypical. High positive correlations (r = 0.99) between Mn/Co and Fe/Co ratios, and lack of correlation of those ratios with Co, Ce, and Ce/Co, indicate that the ANS Fe-Mn crusts are distinct from Pacific seamount Fe-Mn crusts, and reflect region-spec
Authors
V.K. Banakar, J. R. Hein, R.P. Rajani, A.R. Chodankar
Lithium contents and isotopic compositions of ferromanganese deposits from the global ocean
To test the feasibility of using lithium isotopes in marine ferromanganese deposits as an indicator of paleoceanographic conditions and seawater composition, we analyzed samples from a variety of tectonic environments in the global ocean. Hydrogenetic, hydrothermal, mixed hydrogenetic–hydrothermal, and hydrogenetic–diagenetic samples were subjected to a two-step leaching and dissolution procedure
Authors
L.-H. Chan, J. R. Hein
Barite-forming environments along a rifted continental margin, Southern California Borderland
The Southern California Continental Borderland (SCCB) is part of the broad San Andreas transform-fault plate boundary that consists of a series of fault-bounded, petroleum-generating basins. The SCCB has high heat flow and geothermal gradients produced by thinned continental crust and Neogene volcanism. Barite deposits in the SCCB occur along faults.Barite samples from two sea-cliff sites and four
Authors
James R. Hein, Robert A. Zierenberg, J. Barry Maynard, Mark D. Hannington
Quantitative x-ray diffraction mineralogy of Los Angeles basin core samples
This report contains X-ray diffraction (XRD) analysis of mineralogy for 81 sediment samples from cores taken from three drill holes in the Los Angeles Basin in 2000-2001. We analyzed 26 samples from Pier F core, 29 from Pier C core, and 26 from the Webster core. These three sites provide an offshore-onshore record across the Southern California coastal zone. This report is designed to be a data re
Authors
James R. Hein, Brandie R. McIntyre, Brian D. Edwards, Orion I. Lakota
Long-term eruptive activity at a submarine arc volcano
Three-quarters of the Earth's volcanic activity is submarine, located mostly along the mid-ocean ridges, with the remainder along intraoceanic arcs and hotspots at depths varying from greater than 4,000 m to near the sea surface. Most observations and sampling of submarine eruptions have been indirect, made from surface vessels or made after the fact. We describe here direct observations and sampl
Authors
R.W. Embley, W.W. Chadwick, E.T. Baker, D.A. Butterfield, J.A. Resing, Cornel E. J. de Ronde, V. Tunnicliffe, J.E. Lupton, S.K. Juniper, K.H. Rubin, R.J. Stern, G.T. Lebon, K.-I. Nakamura, S.G. Merle, J. R. Hein, D.A. Wiens, Y. Tamura
Methanogenic calcite, 13C-depleted bivalve shells, and gas hydrate from a mud volcano offshore southern California
Methane and hydrogen sulfide vent from a cold seep above a shallowly buried methane hydrate in a mud volcano located 24 km offshore southern California in?? 800 m of water. Bivalves, authigenic calcite, and methane hydrate were recovered in a 2.1 m piston core. Aragonite shells of two bivalve species are unusually depleted in 13C (to -91??? ??13C), the most 13C-depleted shells of marine macrofauna
Authors
J. R. Hein, W. R. Normark, B.R. McIntyre, T.D. Lorenson, C.L. Powell