James Hein
zation
Geologist Emeritus with the USGS Pacific Coastal and Marine Science Center
Science and Products
Filter Total Items: 167
Two major Cenozoic episodes of phosphogenesis recorded in equatorial Pacific seamount deposits Two major Cenozoic episodes of phosphogenesis recorded in equatorial Pacific seamount deposits
Seamount phosphorites have been recognized since the 1950s, but this is the first study to provide an in depth exploration of the origin and history of these widespread deposits. Representative samples from equatorial Pacific Cretaceous seamounts were analyzed for chemical, mineralogical, and stable isotope compositions. The phosphorites occur in a wide variety of forms, but most...
Authors
J.R. Hein, Yeh Hsueh-Wen, S.H. Gunn, W.V. Sliter, L.M. Benninger, Wang Chung-Ho
Hydrothermal palygorskite and ferromanganese mineralization at a central California margin fracture zone Hydrothermal palygorskite and ferromanganese mineralization at a central California margin fracture zone
Ferromanganese oxyhydroxide crusts and nodules associated with palygorskite were recovered from the Santa Lucia Escarpment where the Morro Fracture Zone intersects the central California continental margin. Palygorskite was found in pure, high-Mg, low-Al, boxwork-textured veins, and disseminated in poorly consolidated palygorskite-rich mudstone. The purity of the palygorskite boxwork...
Authors
A. E. Gibbs, J.R. Hein, S.D. Lewis, D. S. McCulloch
Variations in the fine-scale composition of a central Pacific ferromanganese crust: Paleoceanographic implications Variations in the fine-scale composition of a central Pacific ferromanganese crust: Paleoceanographic implications
A 47- to 60-mm-thick Fe-Mn crust from Horizon Guyot (water depth 1800–1780 m), central Pacific, was used to evaluate the potential of crusts as recorders of Neogene paleoceanographic and paleoclimatic conditions. The chemical composition was determined by microprobe for 16 elements from a polished thin section. Three analyses were made per millimeter and averaged to give the composition...
Authors
J.R. Hein, W.A. Bohrson, M. S. Schulz, M. Noble, D.A. Clague
Geology, geophysics, geochemistry, and deep-sea mineral deposits, Federated States of Micronesia: KORDI-USGS R.V. Farnella Cruise F11-90-CP Geology, geophysics, geochemistry, and deep-sea mineral deposits, Federated States of Micronesia: KORDI-USGS R.V. Farnella Cruise F11-90-CP
No abstract available.
Authors
James R. Hein, Jung-Ho Ahn, J.C. Wong, Jung-Keuk Kang, V. K. Smith, Suk-Hoon Yoon, W. M. d’Angelo, Sang-Ok Yoo, A. E. Gibbs, Han-Joon Kim, P. J. Quinterno, Moon-Young Jung, A. S. Davis, Byong-Kwon Park, J.R. Gillison, M. S. Marlow, M. S. Schulz, D. F. Siems, J. E. Taggart, Norma Rait, L. G. Pickthorn, M.J. Malcolm, M. G. Kavulak, Hsueh-Wen Yeh, D. M. Mann, M.A. Noble, G. O. Riddle, B. H. Roushey, Hezekiah Smith
Dolomitization of Quaternary reef limestones, Aitutaki, Cook Islands Dolomitization of Quaternary reef limestones, Aitutaki, Cook Islands
Six holes were drilled to depths of 30–69 m in the shallow lagoon of Aitutaki in the southern Cook Islands. One hole encountered pervasively dolomitized reef limestones at 36 m subbottom depth, which extended to the base of the drilled section at 69·3 m. This hole was drilled near the inner edge of the present barrier reef flat on the flank of a seismically defined subsurface ridge. Both...
Authors
James R. Hein, S.C. Gray, B. M. Richmond, L. D. White
Geochronology and subsurface stratigraphy of Pukapuka and Rakahanga atolls, Cook Islands: Late Quaternary reef growth and sea level history Geochronology and subsurface stratigraphy of Pukapuka and Rakahanga atolls, Cook Islands: Late Quaternary reef growth and sea level history
Eustatic sea-level cycles superposed on thermal subsidence of an atoll produce layers of high sea-level reefs separated by erosional unconformities. Coral samples from these reefs from cores drilled to 50 m beneath the lagoons of Pukapuka and Rakahanga atolls, northern Cook Islands give electron spin resonance (ESR) and U-series ages ranging from the Holocene to 600,000 yr B.P. Subgroups...
Authors
S.C. Gray, J.R. Hein, R. Hausmann, U. Radtke
Science and Products
Filter Total Items: 167
Two major Cenozoic episodes of phosphogenesis recorded in equatorial Pacific seamount deposits Two major Cenozoic episodes of phosphogenesis recorded in equatorial Pacific seamount deposits
Seamount phosphorites have been recognized since the 1950s, but this is the first study to provide an in depth exploration of the origin and history of these widespread deposits. Representative samples from equatorial Pacific Cretaceous seamounts were analyzed for chemical, mineralogical, and stable isotope compositions. The phosphorites occur in a wide variety of forms, but most...
Authors
J.R. Hein, Yeh Hsueh-Wen, S.H. Gunn, W.V. Sliter, L.M. Benninger, Wang Chung-Ho
Hydrothermal palygorskite and ferromanganese mineralization at a central California margin fracture zone Hydrothermal palygorskite and ferromanganese mineralization at a central California margin fracture zone
Ferromanganese oxyhydroxide crusts and nodules associated with palygorskite were recovered from the Santa Lucia Escarpment where the Morro Fracture Zone intersects the central California continental margin. Palygorskite was found in pure, high-Mg, low-Al, boxwork-textured veins, and disseminated in poorly consolidated palygorskite-rich mudstone. The purity of the palygorskite boxwork...
Authors
A. E. Gibbs, J.R. Hein, S.D. Lewis, D. S. McCulloch
Variations in the fine-scale composition of a central Pacific ferromanganese crust: Paleoceanographic implications Variations in the fine-scale composition of a central Pacific ferromanganese crust: Paleoceanographic implications
A 47- to 60-mm-thick Fe-Mn crust from Horizon Guyot (water depth 1800–1780 m), central Pacific, was used to evaluate the potential of crusts as recorders of Neogene paleoceanographic and paleoclimatic conditions. The chemical composition was determined by microprobe for 16 elements from a polished thin section. Three analyses were made per millimeter and averaged to give the composition...
Authors
J.R. Hein, W.A. Bohrson, M. S. Schulz, M. Noble, D.A. Clague
Geology, geophysics, geochemistry, and deep-sea mineral deposits, Federated States of Micronesia: KORDI-USGS R.V. Farnella Cruise F11-90-CP Geology, geophysics, geochemistry, and deep-sea mineral deposits, Federated States of Micronesia: KORDI-USGS R.V. Farnella Cruise F11-90-CP
No abstract available.
Authors
James R. Hein, Jung-Ho Ahn, J.C. Wong, Jung-Keuk Kang, V. K. Smith, Suk-Hoon Yoon, W. M. d’Angelo, Sang-Ok Yoo, A. E. Gibbs, Han-Joon Kim, P. J. Quinterno, Moon-Young Jung, A. S. Davis, Byong-Kwon Park, J.R. Gillison, M. S. Marlow, M. S. Schulz, D. F. Siems, J. E. Taggart, Norma Rait, L. G. Pickthorn, M.J. Malcolm, M. G. Kavulak, Hsueh-Wen Yeh, D. M. Mann, M.A. Noble, G. O. Riddle, B. H. Roushey, Hezekiah Smith
Dolomitization of Quaternary reef limestones, Aitutaki, Cook Islands Dolomitization of Quaternary reef limestones, Aitutaki, Cook Islands
Six holes were drilled to depths of 30–69 m in the shallow lagoon of Aitutaki in the southern Cook Islands. One hole encountered pervasively dolomitized reef limestones at 36 m subbottom depth, which extended to the base of the drilled section at 69·3 m. This hole was drilled near the inner edge of the present barrier reef flat on the flank of a seismically defined subsurface ridge. Both...
Authors
James R. Hein, S.C. Gray, B. M. Richmond, L. D. White
Geochronology and subsurface stratigraphy of Pukapuka and Rakahanga atolls, Cook Islands: Late Quaternary reef growth and sea level history Geochronology and subsurface stratigraphy of Pukapuka and Rakahanga atolls, Cook Islands: Late Quaternary reef growth and sea level history
Eustatic sea-level cycles superposed on thermal subsidence of an atoll produce layers of high sea-level reefs separated by erosional unconformities. Coral samples from these reefs from cores drilled to 50 m beneath the lagoons of Pukapuka and Rakahanga atolls, northern Cook Islands give electron spin resonance (ESR) and U-series ages ranging from the Holocene to 600,000 yr B.P. Subgroups...
Authors
S.C. Gray, J.R. Hein, R. Hausmann, U. Radtke