James Hein
zation
Geologist Emeritus with the USGS Pacific Coastal and Marine Science Center
Science and Products
Filter Total Items: 167
Marine ferromanganese encrustations: Archives of changing oceans Marine ferromanganese encrustations: Archives of changing oceans
Marine iron–manganese oxide coatings occur in many shallow and deep-water areas of the global ocean and can form in three ways: 1) Fe–Mn crusts can precipitate from seawater onto rocks on seamounts; 2) Fe–Mn nodules can form on the sediment surface around a nucleus by diagenetic processes in sediment pore water; 3) encrustations can precipitate from hydrothermal fluids. These oxide...
Authors
Andrea Koschinsky, James R. Hein
Formation of Fe-Mn crusts within a continental margin environment Formation of Fe-Mn crusts within a continental margin environment
This study examines Fe-Mn crusts that form on seamounts along the California continental-margin (CCM), within the United States 200 nautical mile exclusive economic zone. The study area extends from approximately 30° to 38° North latitudes and from 117° to 126° West longitudes. The area of study is a tectonically active northeast Pacific plate boundary region and is also part of the...
Authors
Tracey A. Conrad, James R. Hein, Adina Paytan, David A. Clague
Ferromanganese crusts and nodules, rocks that grow Ferromanganese crusts and nodules, rocks that grow
Ferromanganese (Fe-Mn) crusts and nodules are marine sed- imentary mineral deposits, composed mostly of iron and manganese oxides. They precipitate very slowly from seawa- ter, or for nodules also from deep-sea sediment pore waters, recording the chemical signature of these source waters as they grow. Additional elements incorporate via sorption pro- cesses onto the Fe-Mn oxides...
Authors
Kira Mizell, James R. Hein
News from the seabed: Geological characteristics and resource potential of deep-sea mineral resources News from the seabed: Geological characteristics and resource potential of deep-sea mineral resources
Marine minerals such as manganese nodules, Co-rich ferromanganese crusts, and seafloor massive sulfides are commonly seen as possible future resources that could potentially add to the global raw materials supply. At present, a proper assessment of these resources is not possible due to a severe lack of information regarding their size, distribution, and composition. It is clear, however...
Authors
Swen Petersen, Anna Kratschell, Nico Augustin, John Jamieson, James R. Hein, Mark D. Hannington
Marine phosphorites as potential resources for heavy rare earth elements and yttrium Marine phosphorites as potential resources for heavy rare earth elements and yttrium
Marine phosphorites are known to concentrate rare earth elements and yttrium (REY) during early diagenetic formation. Much of the REY data available are decades old and incomplete, and there has not been a systematic study of REY distributions in marine phosphorite deposits that formed over a range of oceanic environments. Consequently, we initiated this study to determine if marine...
Authors
James R. Hein, Andrea Koschinsky, Mariah Mikesell, Kira Mizell, Craig R. Glenn, Ray Wood
Controls on ferromanganese crust composition and reconnaissance resource potential, Ninetyeast Ridge, Indian Ocean Controls on ferromanganese crust composition and reconnaissance resource potential, Ninetyeast Ridge, Indian Ocean
A reconnaissance survey of Fe-Mn crusts from the 5000 km long (~31°S to 10°N) Ninetyeast Ridge (NER) in the Indian Ocean shows their widespread occurrence along the ridge as well as with water depth on the ridge flanks. The crusts are hydrogenetic based in growth rates and discrimination plots. Twenty samples from 12 crusts from 9 locations along the ridge were analyzed for chemical and
Authors
James R. Hein, Tracey A. Conrad, Kira Mizell, Virupaxa K. Banakar, Frederick A. Frey, William W. Sager
Science and Products
Filter Total Items: 167
Marine ferromanganese encrustations: Archives of changing oceans Marine ferromanganese encrustations: Archives of changing oceans
Marine iron–manganese oxide coatings occur in many shallow and deep-water areas of the global ocean and can form in three ways: 1) Fe–Mn crusts can precipitate from seawater onto rocks on seamounts; 2) Fe–Mn nodules can form on the sediment surface around a nucleus by diagenetic processes in sediment pore water; 3) encrustations can precipitate from hydrothermal fluids. These oxide...
Authors
Andrea Koschinsky, James R. Hein
Formation of Fe-Mn crusts within a continental margin environment Formation of Fe-Mn crusts within a continental margin environment
This study examines Fe-Mn crusts that form on seamounts along the California continental-margin (CCM), within the United States 200 nautical mile exclusive economic zone. The study area extends from approximately 30° to 38° North latitudes and from 117° to 126° West longitudes. The area of study is a tectonically active northeast Pacific plate boundary region and is also part of the...
Authors
Tracey A. Conrad, James R. Hein, Adina Paytan, David A. Clague
Ferromanganese crusts and nodules, rocks that grow Ferromanganese crusts and nodules, rocks that grow
Ferromanganese (Fe-Mn) crusts and nodules are marine sed- imentary mineral deposits, composed mostly of iron and manganese oxides. They precipitate very slowly from seawa- ter, or for nodules also from deep-sea sediment pore waters, recording the chemical signature of these source waters as they grow. Additional elements incorporate via sorption pro- cesses onto the Fe-Mn oxides...
Authors
Kira Mizell, James R. Hein
News from the seabed: Geological characteristics and resource potential of deep-sea mineral resources News from the seabed: Geological characteristics and resource potential of deep-sea mineral resources
Marine minerals such as manganese nodules, Co-rich ferromanganese crusts, and seafloor massive sulfides are commonly seen as possible future resources that could potentially add to the global raw materials supply. At present, a proper assessment of these resources is not possible due to a severe lack of information regarding their size, distribution, and composition. It is clear, however...
Authors
Swen Petersen, Anna Kratschell, Nico Augustin, John Jamieson, James R. Hein, Mark D. Hannington
Marine phosphorites as potential resources for heavy rare earth elements and yttrium Marine phosphorites as potential resources for heavy rare earth elements and yttrium
Marine phosphorites are known to concentrate rare earth elements and yttrium (REY) during early diagenetic formation. Much of the REY data available are decades old and incomplete, and there has not been a systematic study of REY distributions in marine phosphorite deposits that formed over a range of oceanic environments. Consequently, we initiated this study to determine if marine...
Authors
James R. Hein, Andrea Koschinsky, Mariah Mikesell, Kira Mizell, Craig R. Glenn, Ray Wood
Controls on ferromanganese crust composition and reconnaissance resource potential, Ninetyeast Ridge, Indian Ocean Controls on ferromanganese crust composition and reconnaissance resource potential, Ninetyeast Ridge, Indian Ocean
A reconnaissance survey of Fe-Mn crusts from the 5000 km long (~31°S to 10°N) Ninetyeast Ridge (NER) in the Indian Ocean shows their widespread occurrence along the ridge as well as with water depth on the ridge flanks. The crusts are hydrogenetic based in growth rates and discrimination plots. Twenty samples from 12 crusts from 9 locations along the ridge were analyzed for chemical and
Authors
James R. Hein, Tracey A. Conrad, Kira Mizell, Virupaxa K. Banakar, Frederick A. Frey, William W. Sager