Richard Grach is a Scientist Emeritus with the Geology, Geophysics, and Geochemistry Science Center.
Science and Products
Filter Total Items: 55
Weathering of the meade peak phosphatic shale member, phosphoria formation: Observations based on uranium and its decay products
Variably weathered outcrop samples of the Meade Peak Phosphatic Shale Member of the Phosphoria Formation have 5-10% of the contained uranium (U) in a form readily extractable by 0.1 M sodium bicarbonate. Fission track radiography of outcrop samples and other less-weathered channel and core samples indicate that this mobile fraction of U is likely hosted by organic matter, secondary iron oxides and
Authors
Robert A. Zielinski, James R. Budahn, Richard I. Grauch, J. B. Paces, K. R. Simmons
Chapter 8 Petrogenesis and mineralogic residence of selected elements in the meade peak phosphatic shale member of the permian phosphoria formation, Southeast Idaho
The Meade Peak Phosphatic Shale Member of the Permian Phosphoria Formation hosts the ore mined by the phosphate industry of southeast Idaho. It also hosts environmentally sensitive elements (ESE) such as Se, As, Hg, Ni, Cd, Zn, and Cr. Primary chemistry, elemental distribution patterns, and mineralogy within the Meade Peak were modified by element migration and possibly the introduction of element
Authors
Richard I. Grauch, George A. Desborough, Gregory P. Meeker, A. L. Foster, Russell G. Tysdal, J. R. Herring, Heather A. Lowers, B. A. Ball, Robert A. Zielinski, E. A. Johnson
Sources of osmium to the modern oceans: New evidence from the 190Pt-186Os system
High precision Os isotope analysis of young marine manganese nodules indicate that whereas the composition of modern seawater is radiogenic with respect to 187Os/188Os, it has 186Os/188Os that is within uncertainty of the chondritic value. Marine Mn nodule compositions thus indicate that the average continental source of Os to modern seawater had long-term high Re/Os compared to Pt/Os. Analyses of
Authors
D.K. McDaniel, R.J. Walker, S. R. Hemming, M.F. Horan, H. Becker, R. I. Grauch
Mineralogical characterization of weathered and less weathered strata of the Meade Peak phosphatic shale member of the Permian Phosphoria Formation: Measured sections E and F, Rasmussen Ridge, and measured sections G and H, Sage Creek area of the Webster
The Permian Phosphoria Formation of the western U.S. includes one of the largest
phosphate deposits in the world. Despite the economic significance of this formation, its
fine-grained nature has discouraged detailed mineralogical characterization and
quantitative studies. Recently, selenium and other potentially hazardous trace elements
in mine wastes have drawn increased attention to these rocks
Authors
A. C. Knudsen, M. E. Gunter, J. R. Herring, R. I. Grauch
Rare Earth Element Mines, Deposits, and Occurrences
Data on rare earth (including yttrium) mines, deposits, and occurrences were compiled as part of an effort by the USGS and the University of Arizona Center for Mineral Resources to summarize current knowledge on the supply and demand outlook and related topics for this group of elements. Economic competition and environmental concerns are increasingly constraining the mining and processing of rare
Authors
Greta J. Orris, Richard I. Grauch
Mineralogical characterization of strata of the Meade Peak phosphatic shale member of the Permian Phosphoria Formation: Channel and individual rock samples of measured section J and their relationship to measured sections A and B, central part of Rasmusse
The Permian Phosphoria Formation of southeastern Idaho hosts one of the largest phosphate deposits in the world. Despite the economic significance of this Formation, the fine-grained nature of the phosphorite has discouraged detailed mineralogical characterization and quantification studies. Recently, selenium and other potentially toxic trace elements in mine wastes have drawn increased attention
Authors
A. C. Knudsen, M. E. Gunter, J. R. Herring, R. I. Grauch
Chemical composition of strata of the Meade Peak Phosphatic Shale Member of the Permian Phosphoria Formation: Channel-composited and individual rock samples of measured section J and their relationship of measured sections A and B, central part of Rasmuss
This study, one in a series, reports bulk chemical composition of rock samples collected from a core, referred to as Measured Section J, drilled at a site that subsequently was developed into the Enoch Valley phosphate mine in southeastern Idaho. The core is continuous and cuts through the entire thickness of the Meade Peak Phosphatic Shale Member of the Phosphoria Formation. The steeply dipping M
Authors
J. R. Herring, R. I. Grauch, D. F. Siems, R.G. Tysdal, E. A. Johnson, R. A. Zielinski, G. A. Desborough, A. Knudsen, M. E. Gunter
Stratigraphic section and selected semiquantitative chemistry, Meade Peak phosphatic shale member of Permian Phosphoria Formation, central part of Rasmussen Ridge, Caribou County, Idaho
The U.S. Geological Survey (USGS) has studied the Permian Phosphoria Formation in southeastern Idaho and the entire Western U.S. Phosphate Field throughout much of the twentieth century. In response to a request by the U.S. Bureau of Land Management, a new series of resource, geological, and geoenvironmental studies was undertaken by the USGS in 1998. To accomplish these studies, the USGS has form
Authors
R. I. Grauch, R.G. Tysdal, E. A. Johnson, J. R. Herring, G. A. Desborough
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, Dry Valley, Caribou County, Idaho
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; B, Measured sections C and D, Dry Valley, Caribou County, Idaho
Authors
James R. Herring, S. A. Wilson, L.A. Stillings, A. C. Knudsen, M. E. Gunter, R.G. Tysdal, R. I. Grauch, G. A. Desborough, R. A. Zielinski
Low temperature volatilization of selenium from rock samples of the Phosphoria Formation in southeastern Idaho
Authors
George A. Desborough, R. I. Grauch, J. G. Crock, G.P. Meeker, J. R. Herring, R.G. Tysdal
Science and Products
- Publications
Filter Total Items: 55
Weathering of the meade peak phosphatic shale member, phosphoria formation: Observations based on uranium and its decay products
Variably weathered outcrop samples of the Meade Peak Phosphatic Shale Member of the Phosphoria Formation have 5-10% of the contained uranium (U) in a form readily extractable by 0.1 M sodium bicarbonate. Fission track radiography of outcrop samples and other less-weathered channel and core samples indicate that this mobile fraction of U is likely hosted by organic matter, secondary iron oxides andAuthorsRobert A. Zielinski, James R. Budahn, Richard I. Grauch, J. B. Paces, K. R. SimmonsChapter 8 Petrogenesis and mineralogic residence of selected elements in the meade peak phosphatic shale member of the permian phosphoria formation, Southeast Idaho
The Meade Peak Phosphatic Shale Member of the Permian Phosphoria Formation hosts the ore mined by the phosphate industry of southeast Idaho. It also hosts environmentally sensitive elements (ESE) such as Se, As, Hg, Ni, Cd, Zn, and Cr. Primary chemistry, elemental distribution patterns, and mineralogy within the Meade Peak were modified by element migration and possibly the introduction of elementAuthorsRichard I. Grauch, George A. Desborough, Gregory P. Meeker, A. L. Foster, Russell G. Tysdal, J. R. Herring, Heather A. Lowers, B. A. Ball, Robert A. Zielinski, E. A. JohnsonSources of osmium to the modern oceans: New evidence from the 190Pt-186Os system
High precision Os isotope analysis of young marine manganese nodules indicate that whereas the composition of modern seawater is radiogenic with respect to 187Os/188Os, it has 186Os/188Os that is within uncertainty of the chondritic value. Marine Mn nodule compositions thus indicate that the average continental source of Os to modern seawater had long-term high Re/Os compared to Pt/Os. Analyses ofAuthorsD.K. McDaniel, R.J. Walker, S. R. Hemming, M.F. Horan, H. Becker, R. I. GrauchMineralogical characterization of weathered and less weathered strata of the Meade Peak phosphatic shale member of the Permian Phosphoria Formation: Measured sections E and F, Rasmussen Ridge, and measured sections G and H, Sage Creek area of the Webster
The Permian Phosphoria Formation of the western U.S. includes one of the largest phosphate deposits in the world. Despite the economic significance of this formation, its fine-grained nature has discouraged detailed mineralogical characterization and quantitative studies. Recently, selenium and other potentially hazardous trace elements in mine wastes have drawn increased attention to these rocksAuthorsA. C. Knudsen, M. E. Gunter, J. R. Herring, R. I. GrauchRare Earth Element Mines, Deposits, and Occurrences
Data on rare earth (including yttrium) mines, deposits, and occurrences were compiled as part of an effort by the USGS and the University of Arizona Center for Mineral Resources to summarize current knowledge on the supply and demand outlook and related topics for this group of elements. Economic competition and environmental concerns are increasingly constraining the mining and processing of rareAuthorsGreta J. Orris, Richard I. GrauchMineralogical characterization of strata of the Meade Peak phosphatic shale member of the Permian Phosphoria Formation: Channel and individual rock samples of measured section J and their relationship to measured sections A and B, central part of Rasmusse
The Permian Phosphoria Formation of southeastern Idaho hosts one of the largest phosphate deposits in the world. Despite the economic significance of this Formation, the fine-grained nature of the phosphorite has discouraged detailed mineralogical characterization and quantification studies. Recently, selenium and other potentially toxic trace elements in mine wastes have drawn increased attentionAuthorsA. C. Knudsen, M. E. Gunter, J. R. Herring, R. I. GrauchChemical composition of strata of the Meade Peak Phosphatic Shale Member of the Permian Phosphoria Formation: Channel-composited and individual rock samples of measured section J and their relationship of measured sections A and B, central part of Rasmuss
This study, one in a series, reports bulk chemical composition of rock samples collected from a core, referred to as Measured Section J, drilled at a site that subsequently was developed into the Enoch Valley phosphate mine in southeastern Idaho. The core is continuous and cuts through the entire thickness of the Meade Peak Phosphatic Shale Member of the Phosphoria Formation. The steeply dipping MAuthorsJ. R. Herring, R. I. Grauch, D. F. Siems, R.G. Tysdal, E. A. Johnson, R. A. Zielinski, G. A. Desborough, A. Knudsen, M. E. GunterStratigraphic section and selected semiquantitative chemistry, Meade Peak phosphatic shale member of Permian Phosphoria Formation, central part of Rasmussen Ridge, Caribou County, Idaho
The U.S. Geological Survey (USGS) has studied the Permian Phosphoria Formation in southeastern Idaho and the entire Western U.S. Phosphate Field throughout much of the twentieth century. In response to a request by the U.S. Bureau of Land Management, a new series of resource, geological, and geoenvironmental studies was undertaken by the USGS in 1998. To accomplish these studies, the USGS has formAuthorsR. I. Grauch, R.G. Tysdal, E. A. Johnson, J. R. Herring, G. A. DesboroughChemical composition of weathered and less weathered strata of the Meade Peak Phosphatic Shale Member of the Permian Phosphoria Formation
No abstract available.AuthorsJ. R. Herring, R. I. Grauch, G. A. Desborough, S. A. Wilson, R.G. TysdalStratigraphic sections and equivalent uranium (eU), Meade Peak Phosphatic Shale Member of Permian Phosphoria Formation, Dry Valley, Caribou County, Idaho
AuthorsRussell G. Tysdal, G. A. Desborough, J. R. Herring, R. I. Grauch, L.A. StillingsChemical composition of weathered and less weathered strata of the Meade Peak Phosphatic Shale Member of the Permian Phosphoria Formation; B, Measured sections C and D, Dry Valley, Caribou County, Idaho
AuthorsJames R. Herring, S. A. Wilson, L.A. Stillings, A. C. Knudsen, M. E. Gunter, R.G. Tysdal, R. I. Grauch, G. A. Desborough, R. A. ZielinskiLow temperature volatilization of selenium from rock samples of the Phosphoria Formation in southeastern Idaho
AuthorsGeorge A. Desborough, R. I. Grauch, J. G. Crock, G.P. Meeker, J. R. Herring, R.G. Tysdal