James Hein
zation
Geologist Emeritus with the USGS Pacific Coastal and Marine Science Center
Science and Products
Filter Total Items: 166
Low sulfur content in submarine lavas: An unreliable indicator of subaerial eruption
Low S content (<250 ppm) has been used to identify subaerially erupted Hawaiian and Icelandic lavas. Large differences in S content of submarine-erupted lavas from different tectonic settings indicate that the behavior of S is complex. Variations in S abundance in undegassed, submarine-erupted lavas can result from different source compositions, different percentages of partial melting, and crysta
Authors
A. S. Davis, D. A. Clague, M. S. Schulz, J. R. Hein
Age determinations and growth rates of Pacific ferromanganese deposits using strontium isotopes
87Sr86Sr ratios, trace element and REE compositions, and textural characteristics were determined for three hydrogenetic Fe-Mn crusts, one hydrothermal deposit, and two mixed hydrothermalhydrogenetic crusts from the Pacific. The Sr isotope data are compared to the Sr seawater curve for the Cenozoic to determine the ages and growth rates of the crusts. The 87Sr86Sr in the crusts does not increase m
Authors
B. L. Ingram, J. R. Hein, G. L. Farmer
Eocene diatom chert from Adak Island, Alaska
Bedded quartz cherts that contain recognizable diatoms are rare in the geologic record and are described here for the first time. The Eocene Andrew Lake Formation on Adak Island, Alaska consists of about 800 m of sedimentary and volcanogenic rocks. Quartz cherts containing diatoms occur in the upper part of the Andrew Lake Formation and crop out on the northern part of the island. The quartz chert
Authors
James R. Hein, Hseuh-Wen Yeh, John A. Barron
Insular and submarine ferromanganese mineralization of the Tonga-Lau region
Ferromanganese oxides in the Tonga-Lau region are divided into crusts and stratabound deposits. Crusts were collected from the Tonga and Lau Ridges and have Fe/Mn ratios greater than 1, and an average Co content of 0.25%. The crusts average less than 10 mm thick with a maximum of 50 mm, and growth rates of tens of millimeters per million years. The thickest crust is probably less than a million ye
Authors
J. R. Hein, M. S. Schulz, Jung-Keuk Kang
Age determinations and growth rates of Pacific ferromanganese deposits using strontium isotopes
87Sr 86Sr ratios, trace element and REE compositions, and textural characteristics were determined for three hydrogenetic Fe-Mn crusts, one hydrothermal deposit, and two mixed hydrothermalhydrogenetic crusts from the Pacific. The Sr isotope data are compared to the Sr seawater curve for the Cenozoic to determine the ages and growth rates of the crusts. The 87Sr 86Sr in the crusts does not increas
Authors
B. L. Ingram, J. R. Hein, G. L. Farmer
Geological, geochemical, geophysical, and oceanographic data and interpretations of seamounts and co-rich ferromanganese crusts from the Marshall Islands, KORDI-USGS R.V. Farnella cruise F10-89-CP
No abstract available.
Authors
J. R. Hein, Jung-Keuk Kang, M. S. Schulz, Byong-Kwon Park, Herbert Kirschenbaum, Suk-Hoon Yoon, R. L. Olson, V. K. Smith, Dong-Won Park, G. O. Riddle, P. J. Quinterno, Yoon-Oh Lee, A. S. Davis, R. S. Kim, M. S. Pringle, Dong-Lim Choi, L. G. Pickthorn, S. O. Schlanger, F. K. Duennebier, D. D. Bergersen, J. M. Lincoln
Mineralogy and geochemistry of Co-rich ferromanganese crusts and substrate rocks from Karin Ridge and Johnston Island, Farnella Cruise F7-86-HW
No abstract available.
Authors
J. R. Hein, Herbert Kirschenbaum, W. C. Schwab, Akira Usui, K.L. Olson, L. G. Pickthorn, M. S. Schulz, C.L. Morgan
Composition of Basaltic glasses dredged from seven seamounts offshore Southern California on R/V Farnella cruise F7-87-SC
No abstract available.
Authors
A. S. Davis, D. A. Clague, W.B. Friesen, J. R. Hein
Geochemistry and diagenesis of Miocene lacustrine siliceous sedimentary and pyroclastic rocks, Mytilinii basin, Samos Island, Greece
A Late Miocene non-marine stratigraphic sequence composed of limestone, opal-CT-bearing limestone, porcelanite, marlstone, diatomaceous marlstone, dolomite, and tuffite crops out on eastern Samos Island. This lacustrine sequence is subdivided into the Hora Beds and the underlying Pythagorion Formation. The Hora Beds is overlain by the clastic Mytilinii series which contains Turolian (Late Miocene)
Authors
M.G. Stamatakis, J. R. Hein, A.C. Magganas
Morphology of sea-floor landslides on Horizon Guyot: application of steady-state geotechnical analysis
Mass movement and erosion have been identified on the pelagic sediment cap of Horizon Guyot, a seamount in the Mid-Pacific Mountains. Trends in the size, shape and preservation of bedforms and sediment textural trends on the pelagic cap indicate that bottom-current-generated sediment transport direction is upslope. Slumping of the sediment cap occurred on and that the net bedload transport directi
Authors
R. E. Kayen, W. C. Schwab, H.J. Lee, M.E. Torresan, J. R. Hein, P. J. Quinterno, L.A. Levin
Comment and reply on "Bacterially mediated diagenetic origin for chert-hosted manganese deposits in the Franciscan Complex, California Coast Ranges"
No abstract available.
Authors
Loren A. Raymond, James R. Hein, Randolph A. Koski
Maps showing the Seabeam bathymetry and sedimentologic and biologic sample locations on Horizon Guyot, Mid-Pacific Mountains and a summary of existing data
Horizon Guyot (Fig. 1) is a 300-km-long, 75-km-wide volcanic ridge with a relatively flat summit that is diagnostic of guyots (Hess, 1946). The U. S. Geological Survey (USGS) began a study of Horizon Guyot in 1983 as part of a program on the origin, distribution, and composition of ferromanganese-oxide precipitates that encrust the hard substrate of sea floor edifices, such as seamounts and volcan
Authors
W. C. Schwab, J. R. Hein, K.L. Smith, C. P. de Moustier, L.A. Levin, Amatzia Genin, W.W. Wakefield, R.J. Baldwin
Science and Products
Filter Total Items: 166
Low sulfur content in submarine lavas: An unreliable indicator of subaerial eruption
Low S content (<250 ppm) has been used to identify subaerially erupted Hawaiian and Icelandic lavas. Large differences in S content of submarine-erupted lavas from different tectonic settings indicate that the behavior of S is complex. Variations in S abundance in undegassed, submarine-erupted lavas can result from different source compositions, different percentages of partial melting, and crysta
Authors
A. S. Davis, D. A. Clague, M. S. Schulz, J. R. Hein
Age determinations and growth rates of Pacific ferromanganese deposits using strontium isotopes
87Sr86Sr ratios, trace element and REE compositions, and textural characteristics were determined for three hydrogenetic Fe-Mn crusts, one hydrothermal deposit, and two mixed hydrothermalhydrogenetic crusts from the Pacific. The Sr isotope data are compared to the Sr seawater curve for the Cenozoic to determine the ages and growth rates of the crusts. The 87Sr86Sr in the crusts does not increase m
Authors
B. L. Ingram, J. R. Hein, G. L. Farmer
Eocene diatom chert from Adak Island, Alaska
Bedded quartz cherts that contain recognizable diatoms are rare in the geologic record and are described here for the first time. The Eocene Andrew Lake Formation on Adak Island, Alaska consists of about 800 m of sedimentary and volcanogenic rocks. Quartz cherts containing diatoms occur in the upper part of the Andrew Lake Formation and crop out on the northern part of the island. The quartz chert
Authors
James R. Hein, Hseuh-Wen Yeh, John A. Barron
Insular and submarine ferromanganese mineralization of the Tonga-Lau region
Ferromanganese oxides in the Tonga-Lau region are divided into crusts and stratabound deposits. Crusts were collected from the Tonga and Lau Ridges and have Fe/Mn ratios greater than 1, and an average Co content of 0.25%. The crusts average less than 10 mm thick with a maximum of 50 mm, and growth rates of tens of millimeters per million years. The thickest crust is probably less than a million ye
Authors
J. R. Hein, M. S. Schulz, Jung-Keuk Kang
Age determinations and growth rates of Pacific ferromanganese deposits using strontium isotopes
87Sr 86Sr ratios, trace element and REE compositions, and textural characteristics were determined for three hydrogenetic Fe-Mn crusts, one hydrothermal deposit, and two mixed hydrothermalhydrogenetic crusts from the Pacific. The Sr isotope data are compared to the Sr seawater curve for the Cenozoic to determine the ages and growth rates of the crusts. The 87Sr 86Sr in the crusts does not increas
Authors
B. L. Ingram, J. R. Hein, G. L. Farmer
Geological, geochemical, geophysical, and oceanographic data and interpretations of seamounts and co-rich ferromanganese crusts from the Marshall Islands, KORDI-USGS R.V. Farnella cruise F10-89-CP
No abstract available.
Authors
J. R. Hein, Jung-Keuk Kang, M. S. Schulz, Byong-Kwon Park, Herbert Kirschenbaum, Suk-Hoon Yoon, R. L. Olson, V. K. Smith, Dong-Won Park, G. O. Riddle, P. J. Quinterno, Yoon-Oh Lee, A. S. Davis, R. S. Kim, M. S. Pringle, Dong-Lim Choi, L. G. Pickthorn, S. O. Schlanger, F. K. Duennebier, D. D. Bergersen, J. M. Lincoln
Mineralogy and geochemistry of Co-rich ferromanganese crusts and substrate rocks from Karin Ridge and Johnston Island, Farnella Cruise F7-86-HW
No abstract available.
Authors
J. R. Hein, Herbert Kirschenbaum, W. C. Schwab, Akira Usui, K.L. Olson, L. G. Pickthorn, M. S. Schulz, C.L. Morgan
Composition of Basaltic glasses dredged from seven seamounts offshore Southern California on R/V Farnella cruise F7-87-SC
No abstract available.
Authors
A. S. Davis, D. A. Clague, W.B. Friesen, J. R. Hein
Geochemistry and diagenesis of Miocene lacustrine siliceous sedimentary and pyroclastic rocks, Mytilinii basin, Samos Island, Greece
A Late Miocene non-marine stratigraphic sequence composed of limestone, opal-CT-bearing limestone, porcelanite, marlstone, diatomaceous marlstone, dolomite, and tuffite crops out on eastern Samos Island. This lacustrine sequence is subdivided into the Hora Beds and the underlying Pythagorion Formation. The Hora Beds is overlain by the clastic Mytilinii series which contains Turolian (Late Miocene)
Authors
M.G. Stamatakis, J. R. Hein, A.C. Magganas
Morphology of sea-floor landslides on Horizon Guyot: application of steady-state geotechnical analysis
Mass movement and erosion have been identified on the pelagic sediment cap of Horizon Guyot, a seamount in the Mid-Pacific Mountains. Trends in the size, shape and preservation of bedforms and sediment textural trends on the pelagic cap indicate that bottom-current-generated sediment transport direction is upslope. Slumping of the sediment cap occurred on and that the net bedload transport directi
Authors
R. E. Kayen, W. C. Schwab, H.J. Lee, M.E. Torresan, J. R. Hein, P. J. Quinterno, L.A. Levin
Comment and reply on "Bacterially mediated diagenetic origin for chert-hosted manganese deposits in the Franciscan Complex, California Coast Ranges"
No abstract available.
Authors
Loren A. Raymond, James R. Hein, Randolph A. Koski
Maps showing the Seabeam bathymetry and sedimentologic and biologic sample locations on Horizon Guyot, Mid-Pacific Mountains and a summary of existing data
Horizon Guyot (Fig. 1) is a 300-km-long, 75-km-wide volcanic ridge with a relatively flat summit that is diagnostic of guyots (Hess, 1946). The U. S. Geological Survey (USGS) began a study of Horizon Guyot in 1983 as part of a program on the origin, distribution, and composition of ferromanganese-oxide precipitates that encrust the hard substrate of sea floor edifices, such as seamounts and volcan
Authors
W. C. Schwab, J. R. Hein, K.L. Smith, C. P. de Moustier, L.A. Levin, Amatzia Genin, W.W. Wakefield, R.J. Baldwin