Craig P. Marshall
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View article: Raman Spectroscopy of Geological Varieties of Hematite of Varying Crystallinity and Morphology
Raman Spectroscopy of Geological Varieties of Hematite of Varying Crystallinity and Morphology Open
Hematite, α‐Fe 2 O 3 , is a common rock‐forming mineral found in sedimentary, metamorphic, igneous rocks, as well as meteorites, and is ubiquitous on Mars. It is the most thermodynamically stable geological iron oxide mineral that forms un…
View article: Empirical Raman calibration of trioctahedral ferromagnesium chlorite minerals
Empirical Raman calibration of trioctahedral ferromagnesium chlorite minerals Open
Chlorite is a common hydrated‐aluminous phyllosilicate mineral group that forms in most geological environments (e.g., hydrothermal, igneous, sedimentary, and metamorphic). The chemical composition of chlorite depends on several factors in…
View article: System for characterizing semiconductor materials and photovoltaic devices through calibration
System for characterizing semiconductor materials and photovoltaic devices through calibration Open
A method and apparatus for measuring characteristics of a piece of material, typically semiconductor materials including photovoltaic devices. The characteristics may include dislocation defect density, grain boundaries, reflectance, exter…
View article: Small Peptide Derivatives Within the Carbohydrate Recognition Domain of SP-A2 Modulate Asthma Outcomes in Mouse Models and Human Cells
Small Peptide Derivatives Within the Carbohydrate Recognition Domain of SP-A2 Modulate Asthma Outcomes in Mouse Models and Human Cells Open
Surfactant Protein-A (SP-A) is an innate immune modulator that regulates a variety of pulmonary host defense functions. We have shown that SP-A is dysfunctional in asthma, which could be partly due to genetic heterogeneity. In mouse models…
View article: Peer Review #1 of "Putative fossil blood cells reinterpreted as diagenetic structures (v0.1)"
Peer Review #1 of "Putative fossil blood cells reinterpreted as diagenetic structures (v0.1)" Open
Red to red-orange spheres in the vascular canals of fossil bone thin sections have been repeatedly reported using light microscopy.Some of these have been interpreted as the fossilized remains of blood cells or, alternatively, pyrite framb…
View article: Enhanced Olefin Metathesis Performance of Tungsten and Niobium Incorporated Bimetallic Silicates: Evidence of Synergistic Effects
Enhanced Olefin Metathesis Performance of Tungsten and Niobium Incorporated Bimetallic Silicates: Evidence of Synergistic Effects Open
Tungsten and niobium incorporated KIT‐6 (WNb‐KIT‐6) materials were synthesized by a one‐pot sol‐gel method. During 2‐butene+ethylene metathesis with these materials at 450 °C, the propene yield is maximized (∼70 %) at a certain metal compo…
View article: Experimental and Mechanistic Study of Stabilized Dry CO<sub>2</sub> Foam Using Polyelectrolyte Complex Nanoparticles Compatible with Produced Water To Improve Hydraulic Fracturing Performance
Experimental and Mechanistic Study of Stabilized Dry CO<sub>2</sub> Foam Using Polyelectrolyte Complex Nanoparticles Compatible with Produced Water To Improve Hydraulic Fracturing Performance Open
The amount of fresh water used in hydraulic fracturing can be significantly reduced by employing produced water-compatible supercritical CO2 (scCO2) foams. Foams generated using surfactants only have suffered from long-term stability issue…
View article: RAMAN SPECTROSCOPY OF OOLITIC HEMATITE: EVIDENCE OF BIOSIGNATURES IN IRON OXIDE RICH ROCKS
RAMAN SPECTROSCOPY OF OOLITIC HEMATITE: EVIDENCE OF BIOSIGNATURES IN IRON OXIDE RICH ROCKS Open
Results and DiscussionRaman spectroscopy reveals the presence of hematite, quartz, apatite, rhodochrosite, siderite, magnesite, low Mg calcite, and calcite (table 1).Moreover, the hematite composing this formation varies from very poor cry…
View article: Imaging of Vanadium in Microfossils: A New Potential Biosignature
Imaging of Vanadium in Microfossils: A New Potential Biosignature Open
The inability to unambiguously distinguish the biogenicity of microfossil-like structures in the ancient rock record is a fundamental predicament facing Archean paleobiologists and astrobiologists. Therefore, novel methods for discriminati…
View article: Enigmatic Red Beds Exposed at Point of Rocks, Cimarron National Grassland, Morton County, Kansas
Enigmatic Red Beds Exposed at Point of Rocks, Cimarron National Grassland, Morton County, Kansas Open
Point of Rocks, a high-relief bluff overlooking the Cimarron River valley in Morton County, Kansas, is capped by distinct white beds of Neogene Ogallala Formation calcrete that overlie red beds of shale, siltstone, and sandstone. These unf…
View article: 11th International GeoRaman Conference
11th International GeoRaman Conference Open
GeoRaman is an international conference where researchers gather to discuss the application of Raman spectroscopy in the fields of geological, planetary, and archaeological sciences. Historically, the first GeoRaman conference was held in …
View article: Selection of Portable Spectrometers for Planetary Exploration: A Comparison of 532 nm and 785 nm Raman Spectroscopy of Reduced Carbon in Archean Cherts
Selection of Portable Spectrometers for Planetary Exploration: A Comparison of 532 nm and 785 nm Raman Spectroscopy of Reduced Carbon in Archean Cherts Open
Knowledge and understanding of the martian environment has advanced greatly over the past two decades, beginning with NASA's return to the surface of Mars with the Pathfinder mission and its rover Sojourner in 1997 and continuing today wit…
View article: Enigmatic Red Beds Exposed at Point of Rocks, Cimarron National Grassland, Morton County, Kansas: Chronostratigraphic Constraints from Uranium-Lead Dating of Detrital Zircons
Enigmatic Red Beds Exposed at Point of Rocks, Cimarron National Grassland, Morton County, Kansas: Chronostratigraphic Constraints from Uranium-Lead Dating of Detrital Zircons Open
Point of Rocks, a high-relief bluff overlooking the Cimarron River valley in Morton County, Kansas, is capped by distinct white beds of Neogene Ogallala Formation calcrete that overlie red beds of shale, siltstone, and sandstone. These unf…