James Hein
zation
Geologist Emeritus with the USGS Pacific Coastal and Marine Science Center
Science and Products
Filter Total Items: 167
Geophysical investigation of seamounts near the Ogasawara fracture zone, western Pacific Geophysical investigation of seamounts near the Ogasawara fracture zone, western Pacific
This paper provides an analysis of multi-channel seismic data obtained during 2000-2001 on seamounts near the Ogasawara Fracture Zone (OFZ) northwest of the Marshall Islands in the western Pacific. The OFZ is unique in that it is a wide rift zone that includes many seamounts. Seven units are delineated on the basis of acoustic characteristics and depth: three units (I, II, and III) on...
Authors
T.-G. Lee, Kenneth Lee, J.R. Hein, J.-W. Moon
Thallium isotope evidence for a permanent increase in marine organic carbon export in the early Eocene Thallium isotope evidence for a permanent increase in marine organic carbon export in the early Eocene
The first high resolution thallium (Tl) isotope records in two ferromanganese crusts (Fe-Mn crusts), CD29 and D11 from the Pacific Ocean are presented. The crusts record pronounced but systematic changes in 205Tl/203Tl that are unlikely to reflect diagenetic overprinting or changes in isotope fractionation between seawater and Fe-Mn crusts. It appears more likely that the Fe-Mn crusts...
Authors
S.G. Nielsen, S. Mar-Gerrison, A. Gannoun, D. LaRowe, V. Klemm, A. N. Halliday, K.W. Burton, J.R. Hein
New constraints on the Pb and Nd isotopic evolution of NE Atlantic water masses 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...
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
Deep-sea mining: Integrating geology, oceanography, and engineering 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
Metalliferous sediment and a silica-hematite deposit within the Blanco fracture zone, Northeast Pacific 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...
Authors
J.R. Hein, D.A. Clague, R.A. Koski, R.W. Embley, R.E. Dunham
Diffuse flow hydrothermal manganese mineralization along the active Mariana and southern Izu-Bonin arc system, western Pacific 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...
Authors
J.R. Hein, M. S. Schulz, R.E. Dunham, R. J. Stern, S.H. Bloomer
Science and Products
Filter Total Items: 167
Geophysical investigation of seamounts near the Ogasawara fracture zone, western Pacific Geophysical investigation of seamounts near the Ogasawara fracture zone, western Pacific
This paper provides an analysis of multi-channel seismic data obtained during 2000-2001 on seamounts near the Ogasawara Fracture Zone (OFZ) northwest of the Marshall Islands in the western Pacific. The OFZ is unique in that it is a wide rift zone that includes many seamounts. Seven units are delineated on the basis of acoustic characteristics and depth: three units (I, II, and III) on...
Authors
T.-G. Lee, Kenneth Lee, J.R. Hein, J.-W. Moon
Thallium isotope evidence for a permanent increase in marine organic carbon export in the early Eocene Thallium isotope evidence for a permanent increase in marine organic carbon export in the early Eocene
The first high resolution thallium (Tl) isotope records in two ferromanganese crusts (Fe-Mn crusts), CD29 and D11 from the Pacific Ocean are presented. The crusts record pronounced but systematic changes in 205Tl/203Tl that are unlikely to reflect diagenetic overprinting or changes in isotope fractionation between seawater and Fe-Mn crusts. It appears more likely that the Fe-Mn crusts...
Authors
S.G. Nielsen, S. Mar-Gerrison, A. Gannoun, D. LaRowe, V. Klemm, A. N. Halliday, K.W. Burton, J.R. Hein
New constraints on the Pb and Nd isotopic evolution of NE Atlantic water masses 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...
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
Deep-sea mining: Integrating geology, oceanography, and engineering 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
Metalliferous sediment and a silica-hematite deposit within the Blanco fracture zone, Northeast Pacific 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...
Authors
J.R. Hein, D.A. Clague, R.A. Koski, R.W. Embley, R.E. Dunham
Diffuse flow hydrothermal manganese mineralization along the active Mariana and southern Izu-Bonin arc system, western Pacific 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...
Authors
J.R. Hein, M. S. Schulz, R.E. Dunham, R. J. Stern, S.H. Bloomer