James Hein
zation
Geologist Emeritus with the USGS Pacific Coastal and Marine Science Center
Science and Products
Filter Total Items: 167
Actual timing of neodymium isotopic variations recorded by Fe-Mn crusts in the western North Atlantic Actual timing of neodymium isotopic variations recorded by Fe-Mn crusts in the western North Atlantic
Hydrogenetic ferromanganese (Fe-Mn) crusts from the western North Atlantic record variations in the Nd and Pb isotopic composition of Cenozoic deep water preserved during their growth. The timing and cause of the most striking change have been the subject of debate. Some have proposed that the shift took place after 4 Ma in response to the closure of the Panama gateway. Others have...
Authors
K.W. Burton, D.-C. Lee, J.N. Christensen, A. N. Halliday, J.R. Hein
Hafnium isotope stratigraphy of ferromanganese crusts Hafnium isotope stratigraphy of ferromanganese crusts
A Cenozoic record of hafnium isotopic compositions of central Pacific deep water has been obtained from two ferromanganese crusts. The crusts are separated by more than 3000 kilometers but display similar secular variations. Significant fluctuations in hafnium isotopic composition occurred in the Eocene and Oligocene, possibly related to direct advection from the Indian and Atlantic...
Authors
D.-C. Lee, A. N. Halliday, J.R. Hein, K.W. Burton, J.N. Christensen, D. Gunther
Co-rich Fe-Mn crusts from the Marshall Islands (Leg 1) and hydrothermal and hydrogenetic Fe-Mn deposits from Micronesia (Leg 2), KODOS 98-3 cruise, West Pacific Co-rich Fe-Mn crusts from the Marshall Islands (Leg 1) and hydrothermal and hydrogenetic Fe-Mn deposits from Micronesia (Leg 2), KODOS 98-3 cruise, West Pacific
No abstract available.
Authors
J.R. Hein, Jai-Woon Moon, Kyeong-Yong Lee, J.S. Dowling, Ki-Hyune Kim, Malia Burrows, S.H. Park, Youn-ji Choi, A.A. Schuetze, H.-S. Jung, Hyun-Sub Kim, G.C. Lee, Cheong-Kee Park, S.K. Son, Chan-Young Park
Stable isotope, chemical, and mineral compositions of the Middle Proterozoic Lijiaying Mn deposit, Shaanxi Province, China Stable isotope, chemical, and mineral compositions of the Middle Proterozoic Lijiaying Mn deposit, Shaanxi Province, China
The Lijiaying Mn deposit, located about 250 km southwest of Xian, is a high-quality ore characterized by low P and Fe contents and a mean Mn content of about 23%. The ore deposit occurs in shallow-water marine sedimentary rocks of probable Middle Proterozoic age. Carbonate minerals in the ore deposit include kutnahorite, calcite, Mn calcite, and Mg calcite. Carbon (−0.4 to −4.0‰) and...
Authors
Hsueh-Wen Yeh, James R. Hein, Jie Ye, Delian Fan
Composition of Co-rich ferromanganese crusts and substrate rocks from the Marshall Islands, cruise KODOS 97-4 Composition of Co-rich ferromanganese crusts and substrate rocks from the Marshall Islands, cruise KODOS 97-4
No abstract available.
Authors
James R. Hein, Jai-Woon Moon, Kyeong-Yong Lee, Ki-Hyun Kim, Leanne Roberts, Malia Burrows, S.H. Park, Jennifer Dowling, Youn-ji Choi, S.E. Zielinski, Sang-Bum Chi, Laura Benninger, Hyun-Sub Kim, Cheong-Kee Park
Climate and ocean dynamics and the lead isotopic records in Pacific ferromanganese crusts Climate and ocean dynamics and the lead isotopic records in Pacific ferromanganese crusts
As hydrogenous iron-manganese crusts grow, at rates of millimeters per million years, they record changes in the lead isotopic composition of ambient seawater. Time-resolved lead isotopic data for cut slabs of two central Pacific iron-manganese crusts that have been growing since about 50 million years ago were measured in situ by laser ablation, multiple-collector, inductively coupled...
Authors
John N. Christensen, Alex N. Halliday, Linda V. Godfrey, James R. Hein, David K. Rea
Science and Products
Filter Total Items: 167
Actual timing of neodymium isotopic variations recorded by Fe-Mn crusts in the western North Atlantic Actual timing of neodymium isotopic variations recorded by Fe-Mn crusts in the western North Atlantic
Hydrogenetic ferromanganese (Fe-Mn) crusts from the western North Atlantic record variations in the Nd and Pb isotopic composition of Cenozoic deep water preserved during their growth. The timing and cause of the most striking change have been the subject of debate. Some have proposed that the shift took place after 4 Ma in response to the closure of the Panama gateway. Others have...
Authors
K.W. Burton, D.-C. Lee, J.N. Christensen, A. N. Halliday, J.R. Hein
Hafnium isotope stratigraphy of ferromanganese crusts Hafnium isotope stratigraphy of ferromanganese crusts
A Cenozoic record of hafnium isotopic compositions of central Pacific deep water has been obtained from two ferromanganese crusts. The crusts are separated by more than 3000 kilometers but display similar secular variations. Significant fluctuations in hafnium isotopic composition occurred in the Eocene and Oligocene, possibly related to direct advection from the Indian and Atlantic...
Authors
D.-C. Lee, A. N. Halliday, J.R. Hein, K.W. Burton, J.N. Christensen, D. Gunther
Co-rich Fe-Mn crusts from the Marshall Islands (Leg 1) and hydrothermal and hydrogenetic Fe-Mn deposits from Micronesia (Leg 2), KODOS 98-3 cruise, West Pacific Co-rich Fe-Mn crusts from the Marshall Islands (Leg 1) and hydrothermal and hydrogenetic Fe-Mn deposits from Micronesia (Leg 2), KODOS 98-3 cruise, West Pacific
No abstract available.
Authors
J.R. Hein, Jai-Woon Moon, Kyeong-Yong Lee, J.S. Dowling, Ki-Hyune Kim, Malia Burrows, S.H. Park, Youn-ji Choi, A.A. Schuetze, H.-S. Jung, Hyun-Sub Kim, G.C. Lee, Cheong-Kee Park, S.K. Son, Chan-Young Park
Stable isotope, chemical, and mineral compositions of the Middle Proterozoic Lijiaying Mn deposit, Shaanxi Province, China Stable isotope, chemical, and mineral compositions of the Middle Proterozoic Lijiaying Mn deposit, Shaanxi Province, China
The Lijiaying Mn deposit, located about 250 km southwest of Xian, is a high-quality ore characterized by low P and Fe contents and a mean Mn content of about 23%. The ore deposit occurs in shallow-water marine sedimentary rocks of probable Middle Proterozoic age. Carbonate minerals in the ore deposit include kutnahorite, calcite, Mn calcite, and Mg calcite. Carbon (−0.4 to −4.0‰) and...
Authors
Hsueh-Wen Yeh, James R. Hein, Jie Ye, Delian Fan
Composition of Co-rich ferromanganese crusts and substrate rocks from the Marshall Islands, cruise KODOS 97-4 Composition of Co-rich ferromanganese crusts and substrate rocks from the Marshall Islands, cruise KODOS 97-4
No abstract available.
Authors
James R. Hein, Jai-Woon Moon, Kyeong-Yong Lee, Ki-Hyun Kim, Leanne Roberts, Malia Burrows, S.H. Park, Jennifer Dowling, Youn-ji Choi, S.E. Zielinski, Sang-Bum Chi, Laura Benninger, Hyun-Sub Kim, Cheong-Kee Park
Climate and ocean dynamics and the lead isotopic records in Pacific ferromanganese crusts Climate and ocean dynamics and the lead isotopic records in Pacific ferromanganese crusts
As hydrogenous iron-manganese crusts grow, at rates of millimeters per million years, they record changes in the lead isotopic composition of ambient seawater. Time-resolved lead isotopic data for cut slabs of two central Pacific iron-manganese crusts that have been growing since about 50 million years ago were measured in situ by laser ablation, multiple-collector, inductively coupled...
Authors
John N. Christensen, Alex N. Halliday, Linda V. Godfrey, James R. Hein, David K. Rea