James Hein
zation
Geologist Emeritus with the USGS Pacific Coastal and Marine Science Center
Science and Products
Filter Total Items: 166
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
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 oceans. Hafniu
Authors
D.-C. Lee, A. N. Halliday, J. R. Hein, K.W. Burton, J.N. Christensen, D. Gunther
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 oxygen (−3.7
Authors
Hsueh-Wen Yeh, James R. Hein, Jie Ye, Delian Fan
Ordovician reef-hosted Jiaodingshan Mn-Co deposit and Dawashan Mn deposit, Sichuan Province, China
The Jiaodingshan Mn-Co and Dawashan Mn deposits are located in the approximately 2-m thick Daduhe unit of the Wufengian strata of Late Ordovician (Ashgill) age. Paleogeographic reconstruction places the deposits at the time of their formation in a gulf between Chengdu submarine rise and the Kangdian continent. The Jiaodingshan and Dawashan deposits occur in algal-reef facies, the former in an atol
Authors
Delian Fan, James R. Hein, Jie Ye
Osmium isotope variations in the oceans recorded by Fe-Mn crusts
This study presents osmium (Os) isotope data for recent growth surfaces of hydrogenetic ferromanganese (Fe-Mn) crusts from the Pacific, Atlantic and Indian Oceans. In general, these data indicate a relatively uniform Os isotopic composition for modern seawater, but suggest that North Atlantic seawater is slightly more radiogenic than that of the Pacific and Indian Oceans. The systematic difference
Authors
K.W. Burton, B. Bourdon, J.-L. Birck, C.J. Allegre, J. R. Hein
Influence of substrate rocks on Fe-Mn crust composition
Principal Component and other statistical analyses of chemical and mineralogical data of Fe-Mn oxyhydroxide crusts and their underlying rock substrates in the central Pacific indicate that substrate rocks do not influence crust composition. Two ridges near Johnston Atoll were dredged repetitively and up to seven substrate rock types were recovered from small areas of similar water depths. Crusts w
Authors
J. R. Hein, C.L. Morgan
60 Myr records of major elements and Pb-Nd isotopes from hydrogenous ferromanganese crusts: Reconstruction of seawater paleochemistry
We compare the time series of major element geochemical and Pb- and Nd-isotopic composition obtained for seven hydrogenous ferromanganese crusts from the Atlantic, Indian, and Pacific Oceans which cover the last 60 Myr. Average crust growth rates and age-depth relationships were determined directly for the last about 10 Myr using 10Be/9Be profiles. In the absence of other information these were ex
Authors
M. Frank, R. K. O'Nions, J. R. Hein, V.K. Banakar
Diffuse-flow hydrothermal field in an oceanic fracture zone setting, Northeast Pacific: Deposit composition
This is the first reported occurrence of an active hydrothermal field in an oceanic fracture zone setting. The hydrothermal field occurs in a pull-apart basin within the Blanco Fracture Zone (BFZ), which has four distinct mineral deposit types: (1) barite mounds and chimneys, (2) barite stockwork breccia, (3) silica-barite beds, and (4) silica, barite, and Fe-Mn oxyhydroxide in sediments. All depo
Authors
J. R. Hein, R.A. Koski, R.W. Embley, J. Reid, S.-W. Chang
Composition and origin of Early Cambrian Tiantaishan phosphorite-Mn carbonate ores, Shaanxi Province, China
The Tiantaishan phosphorite-Mn carbonate ores occur in the Early Cambrian Tananpo Formation in complexly folded and faulted rocks located in southern Shaanxi Province. About 65 x 106 tonnes of 17% P2O5 ore reserves exist and Mn-ore reserves are about 8.3 x 106 tonnes of +18% Mn. The stratigraphic sequence in ascending order consists of black phyllite, black to gray phosphorite ore, black phyllite,
Authors
J. R. Hein, D. Fan, J. Ye, T. Liu, H.-W. Yeh
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
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 plasma mass
Authors
John N. Christensen, Alex N. Halliday, Linda V. Godfrey, James R. Hein, David K. Rea
The Hf isotopic composition of ferromanganese nodules and crusts and hydrothermal manganese deposits: Implications for seawater Hf
We present Hf and Pb isotopic data, and chemical compositions of the outermost layers of marine ferromanganese deposits of different types (hydrogenous and hydrothermal) with a worldwide distribution. The Hf isotopic compositions display a broad range and refine previously reported regional differences as follows: Atlantic Ocean ɛHf = −4to+2, Indian Ocean ɛHf = +2to+4, Pacific Ocean ɛHf = +3to+10.
Authors
L. V. Godfrey, D.-C. Lee, W. F. Sangrey, A. N. Halliday, V. J. M. Salters, James R. Hein, W. M. White
Science and Products
Filter Total Items: 166
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
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 oceans. Hafniu
Authors
D.-C. Lee, A. N. Halliday, J. R. Hein, K.W. Burton, J.N. Christensen, D. Gunther
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 oxygen (−3.7
Authors
Hsueh-Wen Yeh, James R. Hein, Jie Ye, Delian Fan
Ordovician reef-hosted Jiaodingshan Mn-Co deposit and Dawashan Mn deposit, Sichuan Province, China
The Jiaodingshan Mn-Co and Dawashan Mn deposits are located in the approximately 2-m thick Daduhe unit of the Wufengian strata of Late Ordovician (Ashgill) age. Paleogeographic reconstruction places the deposits at the time of their formation in a gulf between Chengdu submarine rise and the Kangdian continent. The Jiaodingshan and Dawashan deposits occur in algal-reef facies, the former in an atol
Authors
Delian Fan, James R. Hein, Jie Ye
Osmium isotope variations in the oceans recorded by Fe-Mn crusts
This study presents osmium (Os) isotope data for recent growth surfaces of hydrogenetic ferromanganese (Fe-Mn) crusts from the Pacific, Atlantic and Indian Oceans. In general, these data indicate a relatively uniform Os isotopic composition for modern seawater, but suggest that North Atlantic seawater is slightly more radiogenic than that of the Pacific and Indian Oceans. The systematic difference
Authors
K.W. Burton, B. Bourdon, J.-L. Birck, C.J. Allegre, J. R. Hein
Influence of substrate rocks on Fe-Mn crust composition
Principal Component and other statistical analyses of chemical and mineralogical data of Fe-Mn oxyhydroxide crusts and their underlying rock substrates in the central Pacific indicate that substrate rocks do not influence crust composition. Two ridges near Johnston Atoll were dredged repetitively and up to seven substrate rock types were recovered from small areas of similar water depths. Crusts w
Authors
J. R. Hein, C.L. Morgan
60 Myr records of major elements and Pb-Nd isotopes from hydrogenous ferromanganese crusts: Reconstruction of seawater paleochemistry
We compare the time series of major element geochemical and Pb- and Nd-isotopic composition obtained for seven hydrogenous ferromanganese crusts from the Atlantic, Indian, and Pacific Oceans which cover the last 60 Myr. Average crust growth rates and age-depth relationships were determined directly for the last about 10 Myr using 10Be/9Be profiles. In the absence of other information these were ex
Authors
M. Frank, R. K. O'Nions, J. R. Hein, V.K. Banakar
Diffuse-flow hydrothermal field in an oceanic fracture zone setting, Northeast Pacific: Deposit composition
This is the first reported occurrence of an active hydrothermal field in an oceanic fracture zone setting. The hydrothermal field occurs in a pull-apart basin within the Blanco Fracture Zone (BFZ), which has four distinct mineral deposit types: (1) barite mounds and chimneys, (2) barite stockwork breccia, (3) silica-barite beds, and (4) silica, barite, and Fe-Mn oxyhydroxide in sediments. All depo
Authors
J. R. Hein, R.A. Koski, R.W. Embley, J. Reid, S.-W. Chang
Composition and origin of Early Cambrian Tiantaishan phosphorite-Mn carbonate ores, Shaanxi Province, China
The Tiantaishan phosphorite-Mn carbonate ores occur in the Early Cambrian Tananpo Formation in complexly folded and faulted rocks located in southern Shaanxi Province. About 65 x 106 tonnes of 17% P2O5 ore reserves exist and Mn-ore reserves are about 8.3 x 106 tonnes of +18% Mn. The stratigraphic sequence in ascending order consists of black phyllite, black to gray phosphorite ore, black phyllite,
Authors
J. R. Hein, D. Fan, J. Ye, T. Liu, H.-W. Yeh
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
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 plasma mass
Authors
John N. Christensen, Alex N. Halliday, Linda V. Godfrey, James R. Hein, David K. Rea
The Hf isotopic composition of ferromanganese nodules and crusts and hydrothermal manganese deposits: Implications for seawater Hf
We present Hf and Pb isotopic data, and chemical compositions of the outermost layers of marine ferromanganese deposits of different types (hydrogenous and hydrothermal) with a worldwide distribution. The Hf isotopic compositions display a broad range and refine previously reported regional differences as follows: Atlantic Ocean ɛHf = −4to+2, Indian Ocean ɛHf = +2to+4, Pacific Ocean ɛHf = +3to+10.
Authors
L. V. Godfrey, D.-C. Lee, W. F. Sangrey, A. N. Halliday, V. J. M. Salters, James R. Hein, W. M. White