Richard I Grauch
Richard Grach is a Scientist Emeritus with the Geology, Geophysics, and Geochemistry Science Center.
Science and Products
Filter Total Items: 55
Stratigraphic sections and equivalent uranium (eU), Meade Peak phosphatic shale member of Permian Phosphoria Formation, east-central part of Rasmussen Ridge, Caribou County, Idaho
No abstract available.
Authors
Russell G. Tysdal, R. I. Grauch, G. A. Desborough, J. R. Herring
Stratigraphic sections and equivalent uranium (eU), Meade Peak Phosphatic Shale Member of Permian Phosphoria Formation, Dry Valley, Caribou County, Idaho
No abstract available.
Authors
Russell G. Tysdal, G. A. Desborough, J. R. Herring, R. I. Grauch, L.A. Stillings
Chemical composition of weathered and less weathered strata of the Meade Peak Phosphatic Shale Member of the Permian Phosphoria Formation
No abstract available.
Authors
J. R. Herring, R. I. Grauch, G. A. Desborough, S. A. Wilson, R. G. Tysdal
Stratigraphic sections and equivalent uranium (eU), Meade Peak phosphatic shale member of Permian Phosphoria Formation, Sage Creek area of Webster Range, Caribou County, Idaho
No abstract available.
Authors
Russell G. Tysdal, J. R. Herring, R. I. Grauch, G. A. Desborough, E. A. Johnson
Sedimentary exhalative nickel-molybdenum ores in south China
Unique bedded Ni-Mo ores hosted by black shales were discovered in localized paleobasins along the Yangzte platform of southern China in 1971. Textural evidence and radiometric dates imply ore formation during sedimentation of black shales that grade into readily combustible beds, termed stone coals, which contain 10 to 15 percent organic carbon. Studies of 427 fluid inclusions indicate extreme va
Authors
D.A. Lott, R.M. Coveney, J.B. Murowchick, R. I. Grauch
Chemical composition of weathered and unweathered strata of the Meade Peak Phosphatic Shale Member of the Permian Phosphoria Formation-A. Measured sections A and B, central part of Rasmussen Ridge, Caribou County, Idaho
No abstract available.
Authors
J. R. Herring, G. A. Desborough, S. A. Wilson, R. G. Tysdal, R. I. Grauch, M. E. Gunter
Rhenium and osmium isotopes in black shales and Ni-Mo-PGE-rich sulfide layers, Yukon Territory, Canada, and Hunan and Guizhou provinces, China
Rhenium and osmium abundances and osmium isotopic compositions were determined by negative thermal ionization mass spectrometry for samples of Devonian black shale and an associated Ni-enriched sulfide layer from the Yukon Territory, Canada. The same composition information was also obtained for samples of early Cambrian Ni-Mo-rich sulfide layers hosted in black shale in Guizhou and Hunan province
Authors
M.F. Horan, J. W. Morgan, R. I. Grauch, R.M. Coveney, J.B. Murowchick, L.J. Hulbert
Hogtuvaite, a new beryllian member of the aenigmatite group from Norway, with new X-ray data on aenigmatite
Hogtuvaite is a new beryllian member of the aenigmatite group that was discovered in Nordland County, Norway. It is a metamorphic mineral, hosted by Proterozoic granitic gneisses and mafic pegmatites of metamorphic origin. Compositional variations within and between gneiss-hosted samples of hogtuvaite are minimal; however, pegmatite-hosted samples of hogtuvaite are significantly different, contain
Authors
R. I. Grauch
Cyclic variations of sulfur isotopes in Cambrian stratabound Ni-Mo-(PGE-Au) ores of southern China
Cyclic variations of δ34S values over a range of at least 48‰ in pyrite nodules from stratabound Ni-Mo-PGE(Au) ores of southern China are attributed to biogenic reduction of seawater sulfate in an anoxic, phosphogenic, and metallogenic basin. Cyclic introduction and mixing of normal seawater into typically stagnant basin waters led to extreme variations in δ34S values of aqueous sulfide species pr
Authors
J.B. Murowchick, R.M. Coveney, R. I. Grauch, C.S. Eldridge, K.L. Shelton
Field relations, origins, and resource implications for platiniferous molybdenum-nickel ores in black shale of South China
No abstract available
Authors
R.M. Coveney, J.B. Murowchick, R. I. Grauch, Chen Nansheng, M.D. Glascock
Gold and platinum in shales with evidence against extraterrestrial sources of metals
Few black shales contain concentrations of precious metals higher than average continental crust (i.e. ???5 ppb Au). Yet Au and Pt alloys have been reported from the Kupferschiefer in Poland. Moreover, thin sulfide beds in certain Chinese and Canadian shales contain several hundred ppb Au, Pd and Pt and average ???4% Mo and ???2.5% Ni in an association that is difficult to explain. Volcanic and no
Authors
R.M. Coveney, J.B. Murowchick, R. I. Grauch, M.D. Glascock, J.R. Denison
Metalliferous black shales and related ore deposits; proceedings, 1989 United States Working Group meeting, International Geological Correlation Program Project 254
No abstract available.
Authors
Richard I. Grauch, Holly L.O. Huyck
Science and Products
Filter Total Items: 55
Stratigraphic sections and equivalent uranium (eU), Meade Peak phosphatic shale member of Permian Phosphoria Formation, east-central part of Rasmussen Ridge, Caribou County, Idaho
No abstract available.
Authors
Russell G. Tysdal, R. I. Grauch, G. A. Desborough, J. R. Herring
Stratigraphic sections and equivalent uranium (eU), Meade Peak Phosphatic Shale Member of Permian Phosphoria Formation, Dry Valley, Caribou County, Idaho
No abstract available.
Authors
Russell G. Tysdal, G. A. Desborough, J. R. Herring, R. I. Grauch, L.A. Stillings
Chemical composition of weathered and less weathered strata of the Meade Peak Phosphatic Shale Member of the Permian Phosphoria Formation
No abstract available.
Authors
J. R. Herring, R. I. Grauch, G. A. Desborough, S. A. Wilson, R. G. Tysdal
Stratigraphic sections and equivalent uranium (eU), Meade Peak phosphatic shale member of Permian Phosphoria Formation, Sage Creek area of Webster Range, Caribou County, Idaho
No abstract available.
Authors
Russell G. Tysdal, J. R. Herring, R. I. Grauch, G. A. Desborough, E. A. Johnson
Sedimentary exhalative nickel-molybdenum ores in south China
Unique bedded Ni-Mo ores hosted by black shales were discovered in localized paleobasins along the Yangzte platform of southern China in 1971. Textural evidence and radiometric dates imply ore formation during sedimentation of black shales that grade into readily combustible beds, termed stone coals, which contain 10 to 15 percent organic carbon. Studies of 427 fluid inclusions indicate extreme va
Authors
D.A. Lott, R.M. Coveney, J.B. Murowchick, R. I. Grauch
Chemical composition of weathered and unweathered strata of the Meade Peak Phosphatic Shale Member of the Permian Phosphoria Formation-A. Measured sections A and B, central part of Rasmussen Ridge, Caribou County, Idaho
No abstract available.
Authors
J. R. Herring, G. A. Desborough, S. A. Wilson, R. G. Tysdal, R. I. Grauch, M. E. Gunter
Rhenium and osmium isotopes in black shales and Ni-Mo-PGE-rich sulfide layers, Yukon Territory, Canada, and Hunan and Guizhou provinces, China
Rhenium and osmium abundances and osmium isotopic compositions were determined by negative thermal ionization mass spectrometry for samples of Devonian black shale and an associated Ni-enriched sulfide layer from the Yukon Territory, Canada. The same composition information was also obtained for samples of early Cambrian Ni-Mo-rich sulfide layers hosted in black shale in Guizhou and Hunan province
Authors
M.F. Horan, J. W. Morgan, R. I. Grauch, R.M. Coveney, J.B. Murowchick, L.J. Hulbert
Hogtuvaite, a new beryllian member of the aenigmatite group from Norway, with new X-ray data on aenigmatite
Hogtuvaite is a new beryllian member of the aenigmatite group that was discovered in Nordland County, Norway. It is a metamorphic mineral, hosted by Proterozoic granitic gneisses and mafic pegmatites of metamorphic origin. Compositional variations within and between gneiss-hosted samples of hogtuvaite are minimal; however, pegmatite-hosted samples of hogtuvaite are significantly different, contain
Authors
R. I. Grauch
Cyclic variations of sulfur isotopes in Cambrian stratabound Ni-Mo-(PGE-Au) ores of southern China
Cyclic variations of δ34S values over a range of at least 48‰ in pyrite nodules from stratabound Ni-Mo-PGE(Au) ores of southern China are attributed to biogenic reduction of seawater sulfate in an anoxic, phosphogenic, and metallogenic basin. Cyclic introduction and mixing of normal seawater into typically stagnant basin waters led to extreme variations in δ34S values of aqueous sulfide species pr
Authors
J.B. Murowchick, R.M. Coveney, R. I. Grauch, C.S. Eldridge, K.L. Shelton
Field relations, origins, and resource implications for platiniferous molybdenum-nickel ores in black shale of South China
No abstract available
Authors
R.M. Coveney, J.B. Murowchick, R. I. Grauch, Chen Nansheng, M.D. Glascock
Gold and platinum in shales with evidence against extraterrestrial sources of metals
Few black shales contain concentrations of precious metals higher than average continental crust (i.e. ???5 ppb Au). Yet Au and Pt alloys have been reported from the Kupferschiefer in Poland. Moreover, thin sulfide beds in certain Chinese and Canadian shales contain several hundred ppb Au, Pd and Pt and average ???4% Mo and ???2.5% Ni in an association that is difficult to explain. Volcanic and no
Authors
R.M. Coveney, J.B. Murowchick, R. I. Grauch, M.D. Glascock, J.R. Denison
Metalliferous black shales and related ore deposits; proceedings, 1989 United States Working Group meeting, International Geological Correlation Program Project 254
No abstract available.
Authors
Richard I. Grauch, Holly L.O. Huyck