Search Results - "Craddock, Paul R"

Iron and carbon isotope evidence for microbial iron respiration throughout the Archean by Craddock, Paul R., Dauphas, Nicolas

“…Banded Iron-Formations (BIFs) are voluminous chemical sediments that are rich in iron-oxide, carbonate and silica and whose occurrence is unique to the…”
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Iron, zinc, magnesium and uranium isotopic fractionation during continental crust differentiation: The tale from migmatites, granitoids, and pegmatites by Telus, Myriam, Dauphas, Nicolas, Moynier, Frédéric, Tissot, François L.H., Teng, Fang-Zhen, Nabelek, Peter I., Craddock, Paul R., Groat, Lee A.

“…The causes of some stable isotopic variations in felsic rocks are not well understood. In particular, the origin of the heavy Fe isotopic compositions (i.e.,…”
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Geochemistry of hydrothermal fluids from the PACMANUS, Northeast Pual and Vienna Woods hydrothermal fields, Manus Basin, Papua New Guinea by Reeves, Eoghan P., Seewald, Jeffrey S., Saccocia, Peter, Bach, Wolfgang, Craddock, Paul R., Shanks, Wayne C., Sylva, Sean P., Walsh, Emily, Pichler, Thomas, Rosner, Martin

“…Processes controlling the composition of seafloor hydrothermal fluids in silicic back-arc or near-arc crustal settings remain poorly constrained despite…”
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Rare earth element abundances in hydrothermal fluids from the Manus Basin, Papua New Guinea: Indicators of sub-seafloor hydrothermal processes in back-arc basins by Craddock, Paul R., Bach, Wolfgang, Seewald, Jeffrey S., Rouxel, Olivier J., Reeves, Eoghan, Tivey, Margaret K.

“…Rare earth element (REE) concentrations are reported for a large suite of seafloor vent fluids from four hydrothermal systems in the Manus back-arc basin…”
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Sulfur speciation in kerogen and bitumen from gas and oil shales by Pomerantz, Andrew E., Bake, Kyle D., Craddock, Paul R., Kurzenhauser, Kurt W., Kodalen, Brian G., Mitra-Kirtley, Sudipa, Bolin, Trudy B.

“…•We find marked differences in sulfur speciation of kerogen and bitumen from shales.•Kerogen is dominated by reduced sulfur, bitumen more abundant in oxidized…”
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XANES measurements of sulfur chemistry during asphalt oxidation by Greenfield, Michael L., Byrne, Michael, Mitra-Kirtley, Sudipa, Kercher, Eric M., Bolin, Trudy B., Wu, Tianpin, Craddock, Paul R., Bake, Kyle D., Pomerantz, Andrew E.

“…[Display omitted] •Sulfur chemical speciation in a warm-mix asphalt was measured by sulfur K-edge XANES.•Changes in sulfur speciation as a consequence of RTFO…”
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Oxygen and iron isotope constraints on near-surface fractionation effects and the composition of lunar mare basalt source regions by Liu, Yang, Spicuzza, Michael J., Craddock, Paul R., Day, James M.D., Valley, John W., Dauphas, Nicolas, Taylor, Lawrence A.

“…Oxygen and iron isotope analyses of low-Ti and high-Ti mare basalts are presented to constrain their petrogenesis and to assess stable isotope variations…”
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Iron Isotopic Compositions of Geological Reference Materials and Chondrites by Craddock, Paul R., Dauphas, Nicolas

“…High‐precision iron isotopic compositions for Fe‐bearing geological reference materials and chondrites with a wide range of matrices (e.g., silicates, oxides,…”
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Chemical, Molecular, and Microstructural Evolution of Kerogen during Thermal Maturation: Case Study from the Woodford Shale of Oklahoma by Craddock, Paul R, Bake, Kyle D, Pomerantz, Andrew E

“…Integrated elemental, spectroscopic (infrared spectroscopy and X-ray absorption near-edge structure), and gas intrusion (helium pycnometry and nitrogen…”
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Permeability-porosity relationships in seafloor vent deposits: Dependence on pore evolution processes by Zhu, Wenlu, Tivey, Margaret K., Gittings, Hilary, Craddock, Paul R.

“…Systematic laboratory measurements of permeability and porosity were conducted on three large vent structures from the Mothra Hydrothermal vent field on the…”
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Universal Curves Describing the Chemical and Physical Evolution of Type II Kerogen during Thermal Maturation by Craddock, Paul R, Haecker, Adam, Bake, Kyle D, Pomerantz, Andrew E

“…This paper synthesizes and interprets literature data relating to the chemical and physical characteristics of kerogen (solid, insoluble sedimentary organic…”
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Evolution of Kerogen and Bitumen during Thermal Maturation via Semi-Open Pyrolysis Investigated by Infrared Spectroscopy by Craddock, Paul R, Le Doan, Tuong Van, Bake, Kyle, Polyakov, Marina, Charsky, Alyssa M, Pomerantz, Andrew E

“…A series of artificial maturation (anhydrous, semi-open pyrolysis) experiments on Green River oil shale have been performed to simulate the thermal maturation…”
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Iron isotopes may reveal the redox conditions of mantle melting from Archean to Present by Dauphas, Nicolas, Craddock, Paul R., Asimow, Paul D., Bennett, Vickie C., Nutman, Allen P., Ohnenstetter, Daniel

“…High-precision Fe isotopic data for 104 samples, including modern and ancient (≥ 3.7 Ga) subduction-related magmas and mantle peridotites, are presented. These…”
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Insights to magmatic–hydrothermal processes in the Manus back-arc basin as recorded by anhydrite by Craddock, Paul R., Bach, Wolfgang

“…Microchemical analyses of rare earth element (REE) concentrations and Sr and S isotope ratios of anhydrite are used to identify sub-seafloor processes…”
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Structure-Solubility Relationships in Coal, Petroleum, and Immature Source-Rock-Derived Asphaltenes by Bake, Kyle D, Craddock, Paul R, Bolin, Trudy B, Abdallah, Wael, Mitra-Kirtley, Sudipa, Andrews, A. Ballard, Mullins, Oliver C, Pomerantz, Andrew E

“…Five asphaltene samples from three different source types–immature source rock (ISA), petroleum (PA), and coal (CDA)–are studied using integrated chemical and…”
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Geochemistry of hot-springs at the SuSu Knolls hydrothermal field, Eastern Manus Basin: Advanced argillic alteration and vent fluid acidity by Seewald, Jeffrey S., Reeves, Eoghan P., Bach, Wolfgang, Saccocia, Peter J., Craddock, Paul R., Walsh, Emily, Shanks, Wayne C., Sylva, Sean P., Pichler, Thomas, Rosner, Martin

“…SuSu Knolls is an area of ongoing magmatic activity and recent volcanism located in the back-arc spreading environment of the Manus Basin in the Bismarck Sea,…”
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Controls of fluid chemistry and complexation on rare-earth element contents of anhydrite from the Pacmanus subseafloor hydrothermal system, Manus Basin, Papua New Guinea by Bach, Wolfgang, Roberts, Stephen, Vanko, David A, Binns, Ray A, Yeats, Chris J, Craddock, Paul R, Humphris, Susan E

“…Ocean Drilling Program (ODP) leg 193 successfully drilled four deep holes (126 to 386 m) into basement underlying the active dacite-hosted Pacmanus…”
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Submarine venting of magmatic volatiles in the Eastern Manus Basin, Papua New Guinea by Seewald, Jeffrey S., Reeves, Eoghan P., Bach, Wolfgang, Saccocia, Peter J., Craddock, Paul R., Shanks, Wayne C., Sylva, Sean P., Pichler, Thomas, Rosner, Martin, Walsh, Emily

“…The SuSu Knolls and DESMOS hydrothermal fields are located in the back-arc extensional transform zone of the Eastern Manus Basin. In 2006, highly acidic and…”
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Acid demineralization with pyrite removal and critical point drying for kerogen microstructural analysis by Sun, Tao, Bake, Kyle D., Craddock, Paul R., Gunawan, Bryan, Darnell, Larry M., Bissada, Kadry K., Pomerantz, Andrew E.

“…•Novel method to preserve both chemical & microstructural properties of kerogen.•Combines closed-system acid-demineralization & critical point drying…”
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Comparison of quantitative mineral analysis by X-ray diffraction and Fourier transform infrared spectroscopy by Craddock, Paul R, Herron, Michael M, Herron, Susan L

“…Accurate description of mineralogy bears on oilfield operations and can be used to calibrate downhole logs and develop petrophysical models for oilfield…”
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