Poul Emsbo
Poul Emsbo is a Research Geologist with the Geology, Geophysics, and Geochemistry Science Center.
Science and Products
Filter Total Items: 43
Evolution of Ore Deposits and Technology Transfer Project: Isotope and Chemical Methods in Support of the U.S. Geological Survey Science Strategy, 2003-2008 Evolution of Ore Deposits and Technology Transfer Project: Isotope and Chemical Methods in Support of the U.S. Geological Survey Science Strategy, 2003-2008
Principal functions of the U.S. Geological Survey (USGS) Mineral Resources Program are providing assessments of the location, quantity, and quality of undiscovered mineral deposits, and predicting the environmental impacts of exploration and mine development. The mineral and environmental assessments of domestic deposits are used by planners and decisionmakers to improve the stewardship...
Authors
Robert O. Rye, Craig A. Johnson, Gary P. Landis, Albert H. Hofstra, Poul Emsbo, Craig A. Stricker, Andrew G. Hunt, Brian G. Rusk
Hydrothermal zebra dolomite in the Great Basin, Nevada--attributes and relation to Paleozoic stratigraphy, tectonics, and ore deposits Hydrothermal zebra dolomite in the Great Basin, Nevada--attributes and relation to Paleozoic stratigraphy, tectonics, and ore deposits
In other parts of the world, previous workers have shown that sparry dolomite in carbonate rocks may be produced by the generation and movement of hot basinal brines in response to arid paleoclimates and tectonism, and that some of these brines served as the transport medium for metals fixed in Mississippi Valley-type (MVT) and sedimentary exhalative (Sedex) deposits of Zn, Pb, Ag, Au...
Authors
S. F. Diehl, A. H. Hofstra, A.E. Koenig, P. Emsbo, W. Christiansen, Chad Johnson
Testing the limits of Paleozoic chronostratigraphic correlation via high-resolution (<500 k.y.) integrated conodont, graptolite, and carbon isotope (δ13Ccarb) biochemostratigraphy across the Llandovery–Wenlock (Silurian) boundary: Is Testing the limits of Paleozoic chronostratigraphic correlation via high-resolution (<500 k.y.) integrated conodont, graptolite, and carbon isotope (δ13Ccarb) biochemostratigraphy across the Llandovery–Wenlock (Silurian) boundary: Is
The resolution and fidelity of global chronostratigraphic correlation are direct functions of the time period under consideration. By virtue of deep-ocean cores and astrochronology, the Cenozoic and Mesozoic time scales carry error bars of a few thousand years (k.y.) to a few hundred k.y. In contrast, most of the Paleozoic time scale carries error bars of plus or minus a few million...
Authors
Bradley D. Cramer, David K. Loydell, Christian Samtleben, Axel Munnecke, Dimitri Kaljo, Peep Mannik, Tonu Martma, Lennart Jeppsson, Mark A. Kleffner, James E. Barrick, Craig A. Johnson, Poul Emsbo, Michael M. Joachimski, Torsten Bickert, Matthew R. Saltzman
Geologic Criteria for the Assessment of Sedimentary Exhalative (Sedex) Zn-Pb-Ag Deposits Geologic Criteria for the Assessment of Sedimentary Exhalative (Sedex) Zn-Pb-Ag Deposits
Sedex deposits account for more than 50 percent of the world's zinc and lead reserves and furnish more than 25 percent of the world's production of these two metals. This report draws on previous syntheses as well as on topical studies of deposits in sedex basins to determine the characteristics and processes that produced sedex deposits. This analysis also uses studies of the tectonic
Authors
Poul Emsbo
The source of Witwatersrand gold: Evidence from uraninite chemistry The source of Witwatersrand gold: Evidence from uraninite chemistry
An in-situ LA-ICP-MS study of different generations of uraninite from the Mesoarchaean Witwatersrand gold palaeoplacer deposits revealed unusually high Au concentrations in rounded, detrital uraninite grains but no detectable Au in secondary, hydrothermally mobilised uraninite. A Au-enriched uraninite-bearing magmatic host is suggested as a significant source for detrital gold in the...
Authors
Hartwig E. Frimmel, Poul Emsbo, Alan E. Koenig
Composition and source of salinity of ore-bearing fluids in Cu-Au systems of the Carajás Mineral Province, Brazil Composition and source of salinity of ore-bearing fluids in Cu-Au systems of the Carajás Mineral Province, Brazil
The composition and Cl/Br – NaCl ratios of highly saline aqueous inclusions from large tonnage (> 100 t) IOCG deposits (Sossego, Alvo 118, and Igarapé Bahia) and a Paleoproterozoic intrusion-related Cu-Au-(Mo-W-Bi-Sn) deposit (Breves; 50 Mt)) in the Carajás Mineral Province have been analysed by LA-ICP-MS and ion chromatography. In both Cu-Au systems, brine inclusions are Ca-dominated...
Authors
Roberto Xavier, Brian Rusk, Poul Emsbo, Lena Monteiro
Gold and trace element zonation in pyrite using a laser imaging technique: Implications for the timing of gold in orogenic and carlin-style sediment-hosted deposits Gold and trace element zonation in pyrite using a laser imaging technique: Implications for the timing of gold in orogenic and carlin-style sediment-hosted deposits
Laser ablation ICP-MS imaging of gold and other trace elements in pyrite from four different sediment- hosted gold-arsenic deposits has revealed two distinct episodes of gold enrichment in each deposit: an early synsedimentary stage where invisible gold is concentrated in arsenian diagenetic pyrite along with other trace elements, in particular, As, Ni, Pb, Zn, Ag, Mo, Te, V, and Se; and...
Authors
R.R. Large, L. Danyushevsky, C. Hollit, V. Maslennikov, S. Meffre, S. Gilbert, S. Bull, R. Scott, P. Emsbo, H. Thomas, B. Singh, J. Foster
Sulfur- and oxygen-isotopes in sediment-hosted stratiform barite deposits Sulfur- and oxygen-isotopes in sediment-hosted stratiform barite deposits
Sulfur- and oxygen-isotope analyses have been obtained for sediment-hosted stratiform barite deposits in Alaska, Nevada, Mexico, and China to examine the environment of formation of this deposit type. The barite is contained in sedimentary sequences as old as Late Neoproterozoic and as young as Mississippian. If previously published data for other localities are considered, sulfur- and...
Authors
C. A. Johnson, P. Emsbo, F. G. Poole, R. O. Rye
Isotope and Chemical Methods in Support of the U.S. Geological Survey Science Strategy, 2003-2008 Isotope and Chemical Methods in Support of the U.S. Geological Survey Science Strategy, 2003-2008
Principal functions of the Mineral Resources Program are providing information to decision-makers related to mineral deposits on federal lands and predicting the environmental consequences of the mining or natural weathering of those deposits. Performing these functions requires that predictions be made of the likelihood of undiscovered deposits. The predictions are based on geologic and
Authors
R. O. Rye, C. A. Johnson, G. P. Landis, A. H. Hofstra, P. Emsbo, C. A. Stricker, A.G. Hunt, B.G. Rusk
Precipitation of lead-zinc ores in the Mississippi Valley-type deposit at Treves, Cevennes region of southern France Precipitation of lead-zinc ores in the Mississippi Valley-type deposit at Treves, Cevennes region of southern France
The Trèves zinc–lead deposit is one of several Mississippi Valley-type (MVT) deposits in the Cévennes region of southern France. Fluid inclusion studies show that the ore was deposited at temperatures between approximately 80 and 150°C from a brine that derived its salinity mainly from the evaporation of seawater past halite saturation. Lead isotope studies suggest that the metals were...
Authors
D. Leach, J.-C. Macquar, V. Lagneau, J. Leventhal, P. Emsbo, W. Premo
The giant Carlin gold province: A protracted interplay of orogenic, basinal, and hydrothermal processes above a lithospheric boundary The giant Carlin gold province: A protracted interplay of orogenic, basinal, and hydrothermal processes above a lithospheric boundary
Northern Nevada hosts the only province that contains multiple world-class Carlin-type gold deposits. The first-order control on the uniqueness of this province is its anomalous far back-arc tectonic setting over the rifted North American paleocontinental margin that separates Precambrian from Phanerozoic subcontinental lithospheric mantle. Globally, most other significant gold provinces...
Authors
P. Emsbo, D.I. Groves, A. H. Hofstra, F.P. Bierlein
Reply to discussion on “Tectonic controls of Mississippi Valley-type lead–zinc mineralization in orogenic forelands” Reply to discussion on “Tectonic controls of Mississippi Valley-type lead–zinc mineralization in orogenic forelands”
Bradley and Leach (2003) focused on the tectonics of a subset of Mississippi Valley-type (MVT) lead–zinc deposits. Age assignments followed those given in a review of MVT deposits worldwide (Leach et al. 2001)—a paper that provoked a discussion by Kesler and Carrigan (2002) and reply by Leach et al. (2002), similar to the present exchange. While the new discussion by Kesler et al. (2004)...
Authors
Dwight Bradley, David L. Leach, David Symons, Poul Emsbo, Wayne R. Premo, George N. Breit, D. F. Sangster
Science and Products
Filter Total Items: 43
Evolution of Ore Deposits and Technology Transfer Project: Isotope and Chemical Methods in Support of the U.S. Geological Survey Science Strategy, 2003-2008 Evolution of Ore Deposits and Technology Transfer Project: Isotope and Chemical Methods in Support of the U.S. Geological Survey Science Strategy, 2003-2008
Principal functions of the U.S. Geological Survey (USGS) Mineral Resources Program are providing assessments of the location, quantity, and quality of undiscovered mineral deposits, and predicting the environmental impacts of exploration and mine development. The mineral and environmental assessments of domestic deposits are used by planners and decisionmakers to improve the stewardship...
Authors
Robert O. Rye, Craig A. Johnson, Gary P. Landis, Albert H. Hofstra, Poul Emsbo, Craig A. Stricker, Andrew G. Hunt, Brian G. Rusk
Hydrothermal zebra dolomite in the Great Basin, Nevada--attributes and relation to Paleozoic stratigraphy, tectonics, and ore deposits Hydrothermal zebra dolomite in the Great Basin, Nevada--attributes and relation to Paleozoic stratigraphy, tectonics, and ore deposits
In other parts of the world, previous workers have shown that sparry dolomite in carbonate rocks may be produced by the generation and movement of hot basinal brines in response to arid paleoclimates and tectonism, and that some of these brines served as the transport medium for metals fixed in Mississippi Valley-type (MVT) and sedimentary exhalative (Sedex) deposits of Zn, Pb, Ag, Au...
Authors
S. F. Diehl, A. H. Hofstra, A.E. Koenig, P. Emsbo, W. Christiansen, Chad Johnson
Testing the limits of Paleozoic chronostratigraphic correlation via high-resolution (<500 k.y.) integrated conodont, graptolite, and carbon isotope (δ13Ccarb) biochemostratigraphy across the Llandovery–Wenlock (Silurian) boundary: Is Testing the limits of Paleozoic chronostratigraphic correlation via high-resolution (<500 k.y.) integrated conodont, graptolite, and carbon isotope (δ13Ccarb) biochemostratigraphy across the Llandovery–Wenlock (Silurian) boundary: Is
The resolution and fidelity of global chronostratigraphic correlation are direct functions of the time period under consideration. By virtue of deep-ocean cores and astrochronology, the Cenozoic and Mesozoic time scales carry error bars of a few thousand years (k.y.) to a few hundred k.y. In contrast, most of the Paleozoic time scale carries error bars of plus or minus a few million...
Authors
Bradley D. Cramer, David K. Loydell, Christian Samtleben, Axel Munnecke, Dimitri Kaljo, Peep Mannik, Tonu Martma, Lennart Jeppsson, Mark A. Kleffner, James E. Barrick, Craig A. Johnson, Poul Emsbo, Michael M. Joachimski, Torsten Bickert, Matthew R. Saltzman
Geologic Criteria for the Assessment of Sedimentary Exhalative (Sedex) Zn-Pb-Ag Deposits Geologic Criteria for the Assessment of Sedimentary Exhalative (Sedex) Zn-Pb-Ag Deposits
Sedex deposits account for more than 50 percent of the world's zinc and lead reserves and furnish more than 25 percent of the world's production of these two metals. This report draws on previous syntheses as well as on topical studies of deposits in sedex basins to determine the characteristics and processes that produced sedex deposits. This analysis also uses studies of the tectonic
Authors
Poul Emsbo
The source of Witwatersrand gold: Evidence from uraninite chemistry The source of Witwatersrand gold: Evidence from uraninite chemistry
An in-situ LA-ICP-MS study of different generations of uraninite from the Mesoarchaean Witwatersrand gold palaeoplacer deposits revealed unusually high Au concentrations in rounded, detrital uraninite grains but no detectable Au in secondary, hydrothermally mobilised uraninite. A Au-enriched uraninite-bearing magmatic host is suggested as a significant source for detrital gold in the...
Authors
Hartwig E. Frimmel, Poul Emsbo, Alan E. Koenig
Composition and source of salinity of ore-bearing fluids in Cu-Au systems of the Carajás Mineral Province, Brazil Composition and source of salinity of ore-bearing fluids in Cu-Au systems of the Carajás Mineral Province, Brazil
The composition and Cl/Br – NaCl ratios of highly saline aqueous inclusions from large tonnage (> 100 t) IOCG deposits (Sossego, Alvo 118, and Igarapé Bahia) and a Paleoproterozoic intrusion-related Cu-Au-(Mo-W-Bi-Sn) deposit (Breves; 50 Mt)) in the Carajás Mineral Province have been analysed by LA-ICP-MS and ion chromatography. In both Cu-Au systems, brine inclusions are Ca-dominated...
Authors
Roberto Xavier, Brian Rusk, Poul Emsbo, Lena Monteiro
Gold and trace element zonation in pyrite using a laser imaging technique: Implications for the timing of gold in orogenic and carlin-style sediment-hosted deposits Gold and trace element zonation in pyrite using a laser imaging technique: Implications for the timing of gold in orogenic and carlin-style sediment-hosted deposits
Laser ablation ICP-MS imaging of gold and other trace elements in pyrite from four different sediment- hosted gold-arsenic deposits has revealed two distinct episodes of gold enrichment in each deposit: an early synsedimentary stage where invisible gold is concentrated in arsenian diagenetic pyrite along with other trace elements, in particular, As, Ni, Pb, Zn, Ag, Mo, Te, V, and Se; and...
Authors
R.R. Large, L. Danyushevsky, C. Hollit, V. Maslennikov, S. Meffre, S. Gilbert, S. Bull, R. Scott, P. Emsbo, H. Thomas, B. Singh, J. Foster
Sulfur- and oxygen-isotopes in sediment-hosted stratiform barite deposits Sulfur- and oxygen-isotopes in sediment-hosted stratiform barite deposits
Sulfur- and oxygen-isotope analyses have been obtained for sediment-hosted stratiform barite deposits in Alaska, Nevada, Mexico, and China to examine the environment of formation of this deposit type. The barite is contained in sedimentary sequences as old as Late Neoproterozoic and as young as Mississippian. If previously published data for other localities are considered, sulfur- and...
Authors
C. A. Johnson, P. Emsbo, F. G. Poole, R. O. Rye
Isotope and Chemical Methods in Support of the U.S. Geological Survey Science Strategy, 2003-2008 Isotope and Chemical Methods in Support of the U.S. Geological Survey Science Strategy, 2003-2008
Principal functions of the Mineral Resources Program are providing information to decision-makers related to mineral deposits on federal lands and predicting the environmental consequences of the mining or natural weathering of those deposits. Performing these functions requires that predictions be made of the likelihood of undiscovered deposits. The predictions are based on geologic and
Authors
R. O. Rye, C. A. Johnson, G. P. Landis, A. H. Hofstra, P. Emsbo, C. A. Stricker, A.G. Hunt, B.G. Rusk
Precipitation of lead-zinc ores in the Mississippi Valley-type deposit at Treves, Cevennes region of southern France Precipitation of lead-zinc ores in the Mississippi Valley-type deposit at Treves, Cevennes region of southern France
The Trèves zinc–lead deposit is one of several Mississippi Valley-type (MVT) deposits in the Cévennes region of southern France. Fluid inclusion studies show that the ore was deposited at temperatures between approximately 80 and 150°C from a brine that derived its salinity mainly from the evaporation of seawater past halite saturation. Lead isotope studies suggest that the metals were...
Authors
D. Leach, J.-C. Macquar, V. Lagneau, J. Leventhal, P. Emsbo, W. Premo
The giant Carlin gold province: A protracted interplay of orogenic, basinal, and hydrothermal processes above a lithospheric boundary The giant Carlin gold province: A protracted interplay of orogenic, basinal, and hydrothermal processes above a lithospheric boundary
Northern Nevada hosts the only province that contains multiple world-class Carlin-type gold deposits. The first-order control on the uniqueness of this province is its anomalous far back-arc tectonic setting over the rifted North American paleocontinental margin that separates Precambrian from Phanerozoic subcontinental lithospheric mantle. Globally, most other significant gold provinces...
Authors
P. Emsbo, D.I. Groves, A. H. Hofstra, F.P. Bierlein
Reply to discussion on “Tectonic controls of Mississippi Valley-type lead–zinc mineralization in orogenic forelands” Reply to discussion on “Tectonic controls of Mississippi Valley-type lead–zinc mineralization in orogenic forelands”
Bradley and Leach (2003) focused on the tectonics of a subset of Mississippi Valley-type (MVT) lead–zinc deposits. Age assignments followed those given in a review of MVT deposits worldwide (Leach et al. 2001)—a paper that provoked a discussion by Kesler and Carrigan (2002) and reply by Leach et al. (2002), similar to the present exchange. While the new discussion by Kesler et al. (2004)...
Authors
Dwight Bradley, David L. Leach, David Symons, Poul Emsbo, Wayne R. Premo, George N. Breit, D. F. Sangster