William Ridley (Former Employee)
Science and Products
Filter Total Items: 38
Trace and minor element variations and sulfur isotopes in crystalline and colloform ZnS: Incorporation mechanisms and implications for their genesis Trace and minor element variations and sulfur isotopes in crystalline and colloform ZnS: Incorporation mechanisms and implications for their genesis
Various models have been proposed to explain the formation mechanism of colloform sphalerite, but the origin is still under debate. In order to decipher influences on trace element incorporation and sulfur isotope composition, crystalline and colloform sphalerite from the carbonate-hosted Mississippi-Valley Type (MVT) deposit near Wiesloch, SW Germany, were investigated and compared to...
Authors
Katharina Pfaff, Alan Koenig, Thomas Wenzel, Ian Ridley, Ludwig H. Hildebrandt, David L. Leach, Gregor Markl
Volatile abundances and oxygen isotopes in basaltic to dacitic lavas on mid-ocean ridges: The role of assimilation at spreading centers Volatile abundances and oxygen isotopes in basaltic to dacitic lavas on mid-ocean ridges: The role of assimilation at spreading centers
Most geochemical variability in MOR basalts is consistent with low- to moderate-pressure fractional crystallization of various mantle-derived parental melts. However, our geochemical data from MOR high-silica glasses, including new volatile and oxygen isotope data, suggest that assimilation of altered crustal material plays a significant role in the petrogenesis of dacites and may be...
Authors
V.D. Wanless, M.R. Perfit, W.I. Ridley, P.J. Wallace, Craig B. Grimes, E.M. Klein
Trace elements have limited utility for studying migratory connectivity in shorebirds that winter in Argentina Trace elements have limited utility for studying migratory connectivity in shorebirds that winter in Argentina
Trace-element analysis has been suggested as a tool for the study of migratory connectivity because (1) trace-element abundance varies spatially in the environment, (2) trace elements are assimilated into animals' tissues through the diet, and (3) current technology permits the analysis of multiple trace elements in a small tissue sample, allowing the simultaneous exploration of several...
Authors
J. Torres-Dowdall, A.H. Farmer, M. Abril, E.H. Bucher, I. Ridley
Dacite petrogenesis on mid-ocean ridges: Evidence for oceanic crustal melting and assimilation Dacite petrogenesis on mid-ocean ridges: Evidence for oceanic crustal melting and assimilation
Whereas the majority of eruptions at oceanic spreading centers produce lavas with relatively homogeneous mid-ocean ridge basalt (MORB) compositions, the formation of tholeiitic andesites and dacites at mid-ocean ridges (MORs) is a petrological enigma. Eruptions of MOR high-silica lavas are typically associated with ridge discontinuities and have produced regionally significant volumes of...
Authors
V.D. Wanless, M.R. Perfit, W.I. Ridley, E. Klein
Influence of sulfur-bearing polyatomic species on high precision measurements of Cu isotopic composition Influence of sulfur-bearing polyatomic species on high precision measurements of Cu isotopic composition
An increased interest in high precision Cu isotope ratio measurements using multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS) has developed recently for various natural geologic systems and environmental applications, these typically contain high concentrations of sulfur, particularly in the form of sulfate (SO42-) and sulfide (S). For example, Cu, Fe, and Zn...
Authors
M.J. Pribil, R. B. Wanty, W.I. Ridley, D.M. Borrok
A New Occurrence Model for National Assessment of Undiscovered Volcanogenic Massive Sulfide Deposits A New Occurrence Model for National Assessment of Undiscovered Volcanogenic Massive Sulfide Deposits
Volcanogenic massive sulfide (VMS) deposits are very significant current and historical resources of Cu-Pb-Zn-Au-Ag, are active exploration targets in several areas of the United States and potentially have significant environmental effects. This new USGS VMS deposit model provides a comprehensive review of deposit occurrence and ore genesis, and fully integrates recent advances in the
Authors
W.C. Pat Shanks, Cynthia Dusel-Bacon, Randolph Koski, Lisa A. Morgan, Dan Mosier, Nadine M. Piatak, Ian Ridley, Robert R. Seal, Klaus J. Schulz, John F. Slack, Roland Thurston
Science and Products
Filter Total Items: 38
Trace and minor element variations and sulfur isotopes in crystalline and colloform ZnS: Incorporation mechanisms and implications for their genesis Trace and minor element variations and sulfur isotopes in crystalline and colloform ZnS: Incorporation mechanisms and implications for their genesis
Various models have been proposed to explain the formation mechanism of colloform sphalerite, but the origin is still under debate. In order to decipher influences on trace element incorporation and sulfur isotope composition, crystalline and colloform sphalerite from the carbonate-hosted Mississippi-Valley Type (MVT) deposit near Wiesloch, SW Germany, were investigated and compared to...
Authors
Katharina Pfaff, Alan Koenig, Thomas Wenzel, Ian Ridley, Ludwig H. Hildebrandt, David L. Leach, Gregor Markl
Volatile abundances and oxygen isotopes in basaltic to dacitic lavas on mid-ocean ridges: The role of assimilation at spreading centers Volatile abundances and oxygen isotopes in basaltic to dacitic lavas on mid-ocean ridges: The role of assimilation at spreading centers
Most geochemical variability in MOR basalts is consistent with low- to moderate-pressure fractional crystallization of various mantle-derived parental melts. However, our geochemical data from MOR high-silica glasses, including new volatile and oxygen isotope data, suggest that assimilation of altered crustal material plays a significant role in the petrogenesis of dacites and may be...
Authors
V.D. Wanless, M.R. Perfit, W.I. Ridley, P.J. Wallace, Craig B. Grimes, E.M. Klein
Trace elements have limited utility for studying migratory connectivity in shorebirds that winter in Argentina Trace elements have limited utility for studying migratory connectivity in shorebirds that winter in Argentina
Trace-element analysis has been suggested as a tool for the study of migratory connectivity because (1) trace-element abundance varies spatially in the environment, (2) trace elements are assimilated into animals' tissues through the diet, and (3) current technology permits the analysis of multiple trace elements in a small tissue sample, allowing the simultaneous exploration of several...
Authors
J. Torres-Dowdall, A.H. Farmer, M. Abril, E.H. Bucher, I. Ridley
Dacite petrogenesis on mid-ocean ridges: Evidence for oceanic crustal melting and assimilation Dacite petrogenesis on mid-ocean ridges: Evidence for oceanic crustal melting and assimilation
Whereas the majority of eruptions at oceanic spreading centers produce lavas with relatively homogeneous mid-ocean ridge basalt (MORB) compositions, the formation of tholeiitic andesites and dacites at mid-ocean ridges (MORs) is a petrological enigma. Eruptions of MOR high-silica lavas are typically associated with ridge discontinuities and have produced regionally significant volumes of...
Authors
V.D. Wanless, M.R. Perfit, W.I. Ridley, E. Klein
Influence of sulfur-bearing polyatomic species on high precision measurements of Cu isotopic composition Influence of sulfur-bearing polyatomic species on high precision measurements of Cu isotopic composition
An increased interest in high precision Cu isotope ratio measurements using multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS) has developed recently for various natural geologic systems and environmental applications, these typically contain high concentrations of sulfur, particularly in the form of sulfate (SO42-) and sulfide (S). For example, Cu, Fe, and Zn...
Authors
M.J. Pribil, R. B. Wanty, W.I. Ridley, D.M. Borrok
A New Occurrence Model for National Assessment of Undiscovered Volcanogenic Massive Sulfide Deposits A New Occurrence Model for National Assessment of Undiscovered Volcanogenic Massive Sulfide Deposits
Volcanogenic massive sulfide (VMS) deposits are very significant current and historical resources of Cu-Pb-Zn-Au-Ag, are active exploration targets in several areas of the United States and potentially have significant environmental effects. This new USGS VMS deposit model provides a comprehensive review of deposit occurrence and ore genesis, and fully integrates recent advances in the
Authors
W.C. Pat Shanks, Cynthia Dusel-Bacon, Randolph Koski, Lisa A. Morgan, Dan Mosier, Nadine M. Piatak, Ian Ridley, Robert R. Seal, Klaus J. Schulz, John F. Slack, Roland Thurston
*Disclaimer: Listing outside positions with professional scientific organizations on this Staff Profile are for informational purposes only and do not constitute an endorsement of those professional scientific organizations or their activities by the USGS, Department of the Interior, or U.S. Government