James Hein
zation
Geologist Emeritus with the USGS Pacific Coastal and Marine Science Center
Science and Products
Filter Total Items: 167
Maps showing the Seabeam bathymetry and sedimentologic and biologic sample locations on Horizon Guyot, Mid-Pacific Mountains and a summary of existing data 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...
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
Description; mineralogical, chemical, and isotopic compositions; petrography; diagenesis; and uranium-series ages of drill cores from the Lagoon of Aitutaki, Cook Islands Description; mineralogical, chemical, and isotopic compositions; petrography; diagenesis; and uranium-series ages of drill cores from the Lagoon of Aitutaki, Cook Islands
No abstract available.
Authors
J.R. Hein, B. M. Richmond, S.C. Gray, Ruth Hausmann, M.W. Colgan, Dallilah El Sabbagh, L.M. Gein
Cobalt- and platinum-rich ferromanganese crusts and associated substrate rocks from the Marshall Islands Cobalt- and platinum-rich ferromanganese crusts and associated substrate rocks from the Marshall Islands
Ferromanganese crusts cover most hard substrates on seafloor edifices in the central Pacific basin. Crust samples and their associated substrates from seven volcanic edifices of Cretaceous age along the Ratak chain of the Marshall Islands are discussed. The two most abundant substrate lithologies recovered were limestone, dominantly fore-reef slope deposits, and volcanic breccia composed...
Authors
J.R. Hein, W. C. Schwab, A. Davis
Sr and Nd isotopic variations in ferromanganese crusts from the Central Pacific: Implications for age and source provenance Sr and Nd isotopic variations in ferromanganese crusts from the Central Pacific: Implications for age and source provenance
Isotopic analyses of two hydrogenetic ferromanganese (Fe-Mn) crusts from volcanic edifices in the central Pacific Ocean reveal systematic variations in 87Sr86Sr and 143Nd144Nd, with both ratios decreasing as a function of depth into the Fe-Mn crusts. Leaching experiments suggest that Sr in the crusts is contained in at least two discrete sites. A loosely bound Sr, dominated by modern...
Authors
K. Futa, Z. E. Peterman, J.R. Hein
Submarine ferromanganese deposits from the Mariana and Volcano volcanic arcs, West Pacific Submarine ferromanganese deposits from the Mariana and Volcano volcanic arcs, West Pacific
No abstract available.
Authors
J.R. Hein, C.L. Fleishman, L.A. Morgenson, S.H. Bloomer, R. J. Stern
Farnella Cruise F7-86-HW, cobalt-rich ferromanganese crust data report for Karin Ridge and Johnston Island, Central Pacific Farnella Cruise F7-86-HW, cobalt-rich ferromanganese crust data report for Karin Ridge and Johnston Island, Central Pacific
No abstract available.
Authors
J.R. Hein, W. C. Schwab, D.G. Foot, Yoshio Masuda, Akira Usui, A. S. Davis, C.L. Fleishman, D.L. Barna, L. G. Pickthorn, D.A. Larson, Peter Ruzzi, L.M. Benninger, L.M. Gein
Science and Products
Filter Total Items: 167
Maps showing the Seabeam bathymetry and sedimentologic and biologic sample locations on Horizon Guyot, Mid-Pacific Mountains and a summary of existing data 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...
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
Description; mineralogical, chemical, and isotopic compositions; petrography; diagenesis; and uranium-series ages of drill cores from the Lagoon of Aitutaki, Cook Islands Description; mineralogical, chemical, and isotopic compositions; petrography; diagenesis; and uranium-series ages of drill cores from the Lagoon of Aitutaki, Cook Islands
No abstract available.
Authors
J.R. Hein, B. M. Richmond, S.C. Gray, Ruth Hausmann, M.W. Colgan, Dallilah El Sabbagh, L.M. Gein
Cobalt- and platinum-rich ferromanganese crusts and associated substrate rocks from the Marshall Islands Cobalt- and platinum-rich ferromanganese crusts and associated substrate rocks from the Marshall Islands
Ferromanganese crusts cover most hard substrates on seafloor edifices in the central Pacific basin. Crust samples and their associated substrates from seven volcanic edifices of Cretaceous age along the Ratak chain of the Marshall Islands are discussed. The two most abundant substrate lithologies recovered were limestone, dominantly fore-reef slope deposits, and volcanic breccia composed...
Authors
J.R. Hein, W. C. Schwab, A. Davis
Sr and Nd isotopic variations in ferromanganese crusts from the Central Pacific: Implications for age and source provenance Sr and Nd isotopic variations in ferromanganese crusts from the Central Pacific: Implications for age and source provenance
Isotopic analyses of two hydrogenetic ferromanganese (Fe-Mn) crusts from volcanic edifices in the central Pacific Ocean reveal systematic variations in 87Sr86Sr and 143Nd144Nd, with both ratios decreasing as a function of depth into the Fe-Mn crusts. Leaching experiments suggest that Sr in the crusts is contained in at least two discrete sites. A loosely bound Sr, dominated by modern...
Authors
K. Futa, Z. E. Peterman, J.R. Hein
Submarine ferromanganese deposits from the Mariana and Volcano volcanic arcs, West Pacific Submarine ferromanganese deposits from the Mariana and Volcano volcanic arcs, West Pacific
No abstract available.
Authors
J.R. Hein, C.L. Fleishman, L.A. Morgenson, S.H. Bloomer, R. J. Stern
Farnella Cruise F7-86-HW, cobalt-rich ferromanganese crust data report for Karin Ridge and Johnston Island, Central Pacific Farnella Cruise F7-86-HW, cobalt-rich ferromanganese crust data report for Karin Ridge and Johnston Island, Central Pacific
No abstract available.
Authors
J.R. Hein, W. C. Schwab, D.G. Foot, Yoshio Masuda, Akira Usui, A. S. Davis, C.L. Fleishman, D.L. Barna, L. G. Pickthorn, D.A. Larson, Peter Ruzzi, L.M. Benninger, L.M. Gein