James Hein
zation
Geologist Emeritus with the USGS Pacific Coastal and Marine Science Center
Science and Products
Filter Total Items: 166
Paleogene geology and chronology of southwestern Umnak Island, Aleutian Islands, Alaska
The rocks of southwestern Umnak Island (Nikolski area) consist mainly of a slightly deformed marine sedimentary sequence intruded by hypabyssal quartz diorite sills and small plutons. Laminated and thin-bedded argillaceous and tuffaceous mudstone and siltstone reflect volcanic arc sedimentation from late Eocene to early Oligocene time. Zeolite facies minerals formed during diagenesis include heula
Authors
H. McLean, J. R. Hein
Distribution of clay minerals in the suspended and bottom sediments from the northern Bering Sea shelf area, Alaska
No abstract available.
Authors
Frederika C. Moser, James R. Hein
Reconnaissance geology of southern Atka Island, Aleutian Islands, Alaska
No abstract available.
Authors
James R. Hein, Hugh McLean, T.L. Vallier
Uranium and thorium enrichment in rocks from the base of DSDP Hole 465A, Hess Rise, central North Pacific
Uranium and thorium are concentrated in Cretaceous limestone, chert, ash, basalt, and other rock types at Deep Sea Drilling Project Site 465 located on the southern Hess Rise in the central North Pacific. U concentrations, up to 194 ppm on a carbonate-free basis, are among the highest recorded for any deep-sea deposits. U was initially derived from seawater and concentrated by absorption on terrig
Authors
J. R. Hein, R.A. Koski, L.A. Morgenson
Petrographic and chemical characteristics of pyrite-marcasite mineralization in hole 465A, southern Hess Rise
Core recovered from Hess Rise contains concentrations of pyrite, marcasite, and barite in the lowermost meter of limestone (Unit II) and in the brecciated upper part of the underlying volcanic basement (Unit HI). Petrographic and chemical data indicate that the sulfide-barite assemblage in the limestone is mainly a product of low-temperature diagenetic processes. The iron-sulfide phases are biogen
Authors
Randolph A. Koski, James R. Hein
Reconnaissance geologic map of Atka and Amlia islands, Alaska
No abstract available.
Authors
James R. Hein, Hugh McLean, T.L. Vallier
Bibliography of fine-grained siliceous deposits
This bibliography was compiled under the auspices of the International Geologic Correlations Project's (IGCP) Research Group 115, "Siliceous Deposits of the Pacific Region"; IGCP is sponsored by UNESCO and the International Union of Geological Sciences (IUGS). Research Group 115 was originally proposed to IGCP in 1974 by Professor Azuma Iijima, University of Tokyo, and is now headed by James R. He
Authors
James R. Hein
Clay mineralogy, fine-grained sediment dispersal, and inferred current patterns, lower Cook Inlet and Kodiak shelf, Alaska
Because lower Cook Inlet and Kodiak shelf are being explored and developed for their petroleum resources, it is essential for environmental reasons to understand the sediment dispersal routes and current patterns. The Susitna River flows into upper Cook Inlet and is the source of clay minerals in Holocene deposits found in western lower Cook Inlet. The Copper River, in the northern Gulf of Alaska,
Authors
J. R. Hein, A.H. Bouma, M. A. Hampton, Ross C. Robin
Episodes of Aleutian Ridge explosive volcanism
Earlier workers have overlooked deep-sea bentonite beds when unraveling the Cenozoic volcanic history of an area. In the North Pacific, identification of Miocene and older volcanic episodes is possible only if both altered (bentonite) and unaltered ash beds are recognized. Our study, which includes bentonite beds, shows that volcanism on the Aleutian Ridge and Kamchatka Peninsula has been cyclic.
Authors
J. R. Hein, D.W. Scholl, J. Miller
Distribution of clay minerals in lower Cook Inlet and Kodiak Shelf sediment, Alaska
No abstract available.
Authors
James R. Hein, Arnold H. Bouma, Monty A. Hampton
Science and Products
Filter Total Items: 166
Paleogene geology and chronology of southwestern Umnak Island, Aleutian Islands, Alaska
The rocks of southwestern Umnak Island (Nikolski area) consist mainly of a slightly deformed marine sedimentary sequence intruded by hypabyssal quartz diorite sills and small plutons. Laminated and thin-bedded argillaceous and tuffaceous mudstone and siltstone reflect volcanic arc sedimentation from late Eocene to early Oligocene time. Zeolite facies minerals formed during diagenesis include heula
Authors
H. McLean, J. R. Hein
Distribution of clay minerals in the suspended and bottom sediments from the northern Bering Sea shelf area, Alaska
No abstract available.
Authors
Frederika C. Moser, James R. Hein
Reconnaissance geology of southern Atka Island, Aleutian Islands, Alaska
No abstract available.
Authors
James R. Hein, Hugh McLean, T.L. Vallier
Uranium and thorium enrichment in rocks from the base of DSDP Hole 465A, Hess Rise, central North Pacific
Uranium and thorium are concentrated in Cretaceous limestone, chert, ash, basalt, and other rock types at Deep Sea Drilling Project Site 465 located on the southern Hess Rise in the central North Pacific. U concentrations, up to 194 ppm on a carbonate-free basis, are among the highest recorded for any deep-sea deposits. U was initially derived from seawater and concentrated by absorption on terrig
Authors
J. R. Hein, R.A. Koski, L.A. Morgenson
Petrographic and chemical characteristics of pyrite-marcasite mineralization in hole 465A, southern Hess Rise
Core recovered from Hess Rise contains concentrations of pyrite, marcasite, and barite in the lowermost meter of limestone (Unit II) and in the brecciated upper part of the underlying volcanic basement (Unit HI). Petrographic and chemical data indicate that the sulfide-barite assemblage in the limestone is mainly a product of low-temperature diagenetic processes. The iron-sulfide phases are biogen
Authors
Randolph A. Koski, James R. Hein
Reconnaissance geologic map of Atka and Amlia islands, Alaska
No abstract available.
Authors
James R. Hein, Hugh McLean, T.L. Vallier
Bibliography of fine-grained siliceous deposits
This bibliography was compiled under the auspices of the International Geologic Correlations Project's (IGCP) Research Group 115, "Siliceous Deposits of the Pacific Region"; IGCP is sponsored by UNESCO and the International Union of Geological Sciences (IUGS). Research Group 115 was originally proposed to IGCP in 1974 by Professor Azuma Iijima, University of Tokyo, and is now headed by James R. He
Authors
James R. Hein
Clay mineralogy, fine-grained sediment dispersal, and inferred current patterns, lower Cook Inlet and Kodiak shelf, Alaska
Because lower Cook Inlet and Kodiak shelf are being explored and developed for their petroleum resources, it is essential for environmental reasons to understand the sediment dispersal routes and current patterns. The Susitna River flows into upper Cook Inlet and is the source of clay minerals in Holocene deposits found in western lower Cook Inlet. The Copper River, in the northern Gulf of Alaska,
Authors
J. R. Hein, A.H. Bouma, M. A. Hampton, Ross C. Robin
Episodes of Aleutian Ridge explosive volcanism
Earlier workers have overlooked deep-sea bentonite beds when unraveling the Cenozoic volcanic history of an area. In the North Pacific, identification of Miocene and older volcanic episodes is possible only if both altered (bentonite) and unaltered ash beds are recognized. Our study, which includes bentonite beds, shows that volcanism on the Aleutian Ridge and Kamchatka Peninsula has been cyclic.
Authors
J. R. Hein, D.W. Scholl, J. Miller
Distribution of clay minerals in lower Cook Inlet and Kodiak Shelf sediment, Alaska
No abstract available.
Authors
James R. Hein, Arnold H. Bouma, Monty A. Hampton