Bibliothèque de L'IMIST/CNRST

Geological, geoenvironmental, and resource studies were completed to study a world-class phosphate ore in the Western US Phosphate Field. This integrated, multi-agency, multidisciplinary research emphasized: (1) Geological and geochemical baseline characterization of the deposit and associated rocks, (2) Delineation, assessment, and spatial analysis of phosphate resources and lands disturbed by mining, (3) Contaminant residence, reaction pathways, and environmental fate associated with the occurrence, development, and use of phosphate rock, and (4) Depositional origin and evolution of the Phosphoria Formation and deposit and geoenvironmental modeling.

Includes bibliographical references and indexes.

Description based on print version record.

Cover -- CONTENTS -- Preface -- List of Contributors -- PART I: INTRODUCTION -- Chapter 1. The Permian Earth -- Introduction -- Geology, plate tectonics, paleogeography -- Climate -- Oceanography -- Western North American margin and the Phosphoria sea -- End of Permian -- Chapter 2. Evolution of thought concerning the origin of the Phosphoria Formation, Western US Phosphate Field -- Abstract -- Introduction -- Delineation of western phosphate lands: Pre- 1940s -- Geochemical exploration, P, U, and V: The 1940s-1950s -- Depositional environments and transgressive-regressive cycles: The 1960s-1970s -- Paleogeography, phosphogenesis, and sequence stratigraphy: 1980-2002 -- Outstanding issues -- PART II: REGIONAL STUDIES -- Chapter 3. The history of production of the Western Phosphate Field -- Abstract -- Introduction -- Early scientific surveys -- Laws associated with US phosphate exploration and mining -- Idaho -- Montana -- Utah -- Wyoming -- Mining in the Western Phosphate Field in the twenty-first century -- Chapter 4. The Meade Peak Member of the Phosphoria Formation: Temporal and spatial variations in sediment geochemistry -- Abstract -- Introduction -- Methods and data evaluation -- Element associations -- Temporal variations in terrigenous elements -- Spatial variations in terrigenous elements -- Temporal variations in marine elements -- Spatial variations in marine elements -- Conclusions -- Chapter 5. Regional analysis of spiculite faunas in the Permian Phosphoria basin: Implication for paleoceanography -- Abstract -- Introduction -- Background and previous studies -- Methods -- Results -- Central belt mixed choristid demosponge-hexactinellid sponge assemblages associated with (ruzhencevispongacid) radiolarians -- Angayucham terrane and Northern Brooks Range -- Discussion and conclusions -- Chapter 6. Strain distribution and structural evolution of the Meade plate, southeastern Idaho -- Abstract -- Introduction -- Depth of burial -- Thermal history -- Structure -- Conclusions -- PART III: GEOLOGICAL AND GEOCHEMICAL STUDIES IN SOUTHEAST IDAHO -- Chapter 7. The effects of weathering on the mineralogy of the Phosphoria Formation, southeast Idaho -- Abstract -- Introduction -- Carbonate fluorapatite -- Methods -- Results -- Discussion -- Conclusions -- Chapter 8. Petrogenesis and mineralogic residence of selected elements in the Meade Peak Phosphatic Shale Member of the Permian Phosphoria Formation, southeast Idaho -- Abstract -- Introduction -- Geologic setting and history -- Approach and methodology -- Results and discussion -- Conceptual model -- Chapter 9. Weathering of the Meade Peak Phosphatic Shale Member, Phosphoria Formation: Observations based on uranium and its decay products -- Abstract -- Introduction -- Sample collection and description -- Analytical methods -- Results and Discussion -- Conclusions -- Chapter 10. Mineral affinities and distribution of selenium and other trace elements in black shale and phosphorite of the Phosphoria Formation -- Abstract -- Introduction -- Methods -- Results --T$