T. G. Sharp
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View article: Insights from and future directions for a nationwide science and engineering education collaboration in stratospheric ballooning
Insights from and future directions for a nationwide science and engineering education collaboration in stratospheric ballooning Open
The Nationwide Eclipse Ballooning Project (NEBP) engaged 53 teams of students from across the United States to fly experiments on high-altitude balloons for the 2023 annular and 2024 total solar eclipses. By many measures, NEBP was a succe…
View article: Teaching Foundation Doctors How to Manage Tracheostomy Emergencies
Teaching Foundation Doctors How to Manage Tracheostomy Emergencies Open
Background and objective Tracheostomies are increasingly common in both acute and long-term clinical settings. As more and more patients with tracheostomies are being managed on general wards, Foundation Year 1 (FY1) doctors - often the fi…
View article: Bowman’s layer and corneal thickness in health and disease
Bowman’s layer and corneal thickness in health and disease Open
Purpose To investigate central Bowman’s layer thickness (BT) in relation to central corneal thickness (CCT) and curvature, and epithelial thickness in healthy and disease corneas. Methods Patients with keratoconus (KC), corneal dystrophies…
View article: Unveiling deep Earth's hidden potential: insights from a new high-pressure phase discovered in a shocked meteorite
Unveiling deep Earth's hidden potential: insights from a new high-pressure phase discovered in a shocked meteorite Open
In this study, we report the discovery of a novel high-pressure phase within the Suizhou shocked meteorite, shedding light on the extreme conditions encountered during meteorite impacts. Utilizing advanced analytical techniques including e…
View article: The source craters of the martian meteorites: Implications for the igneous evolution of Mars
The source craters of the martian meteorites: Implications for the igneous evolution of Mars Open
Approximately 200 meteorites come from ~10 impact events on the surface of Mars, yet their pre-ejection locations are largely unknown. Here, we combine the results of diverse sets of observations and modeling to constrain the source crater…
View article: Deep Dielectric Breakdown of Silicates: Microstructural Damage and Implications for Lunar Space Weathering
Deep Dielectric Breakdown of Silicates: Microstructural Damage and Implications for Lunar Space Weathering Open
Solar energetic particle events electrically charge the lunar surface and may produce electric fields sufficient to induce dielectric breakdown in regolith grains. We irradiated series of silicate minerals with electrons to determine their…
View article: Al‐Cu‐Fe alloys in the solar system: Going inside a Khatyrka‐like micrometeorite (KT01) from the Nubian Desert, Sudan
Al‐Cu‐Fe alloys in the solar system: Going inside a Khatyrka‐like micrometeorite (KT01) from the Nubian Desert, Sudan Open
A recently described micrometeorite from the Nubian desert (Sudan) contains an exotic Al‐Cu‐Fe assemblage closely resembling that observed in the Khatyrka chondrite (Suttle et al., 2019; Science Reports 9:12426). We here extend previous in…
View article: Nanoscale Analyses of X-ray Amorphous Material from Terrestrial Ultramafic Soils Record Signatures of Environmental Conditions Useful for Interpreting Past Martian Conditions
Nanoscale Analyses of X-ray Amorphous Material from Terrestrial Ultramafic Soils Record Signatures of Environmental Conditions Useful for Interpreting Past Martian Conditions Open
X-ray amorphous material that is variably Mg/Fe/Si-rich and Al-poor and that likely contains secondary alteration products is prevalent in Gale crater sediments and rocks (15-73 wt.%). However, the structure and origin of these materials a…
View article: Fe-rich X-Ray Amorphous Material Records Past Climate and Persistence of Water on Mars
Fe-rich X-Ray Amorphous Material Records Past Climate and Persistence of Water on Mars Open
The assemblage of secondary minerals in martian rocks can help constrain the characteristics of past surface and subsurface fluids as well as past climatic conditions. X-ray amorphous material is an important part of martian surface materi…
View article: Origin of Low-26Al/27Al Corundum/Hibonite Inclusions in Meteorites
Origin of Low-26Al/27Al Corundum/Hibonite Inclusions in Meteorites Open
Most meteoritic calcium-rich, aluminum-rich inclusions formed from a reservoir with 26 Al/ 27 Al ≈ 5 × 10 −5 , but some record lower , demanding they sampled a reservoir without live 26 Al. This has been interpreted as evi…
View article: Origin of Low-${}^{26}{\rm Al}/{}^{27}{\rm Al}$ Corundum/Hibonite Inclusions in Meteorites
Origin of Low-${}^{26}{\rm Al}/{}^{27}{\rm Al}$ Corundum/Hibonite Inclusions in Meteorites Open
Most meteoritic calcium-rich, aluminum-rich inclusions (CAIs) formed from a reservoir with ${}^{26}{\rm Al}/{}^{27}{\rm Al} \approx 5 \times 10^{-5}$, but some record lower $({}^{26}{\rm Al}/{}^{27}{\rm Al})_0$, demanding they sampled a re…
View article: Erin L. Walton (1978–2022)
Erin L. Walton (1978–2022) Open
Erin Lindsey Walton Hauck passed away on September 21, 2022 at the age of 44 following a battle with cancer. She was born on August 4, 1978 in Fredericton, New Brunswick, Canada. Erin grew up with a love and respect for the natural world t…
View article: Ringwoodite rim around olivine core in shock-induced melt-vein of GRV 022321 chondrite: Transformation kinetics of olivine to ringwoodite
Ringwoodite rim around olivine core in shock-induced melt-vein of GRV 022321 chondrite: Transformation kinetics of olivine to ringwoodite Open
Here we report the natural occurrence of the ringwoodite rims around olivine cores in shock-induced melt veins of the Antarctic chondrite GRV 022321. Electron microprobe analysis (EMPA), Raman spectroscopy, Scanning electron microscopy (SE…
View article: Formation, preservation and extinction of high-pressure minerals in meteorites: temperature effects in shock metamorphism and shock classification
Formation, preservation and extinction of high-pressure minerals in meteorites: temperature effects in shock metamorphism and shock classification Open
The goal of classifying shock metamorphic features in meteorites is to estimate the corresponding shock pressure conditions. However, the temperature variability of shock metamorphism is equally important and can result in a diverse and he…
View article: CSD 1936917: Experimental Crystal Structure Determination
CSD 1936917: Experimental Crystal Structure Determination Open
An entry from the Inorganic Crystal Structure Database, the world’s repository for inorganic crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely availabl…
View article: Evidence for the charge disproportionation of iron in extraterrestrial bridgmanite
Evidence for the charge disproportionation of iron in extraterrestrial bridgmanite Open
We find that the charge disproportionation reaction of ferrous iron occurs in a natural high-pressure environment.
View article: Shock Veins in Meteorites: What They Tell Us About Shock Conditions
Shock Veins in Meteorites: What They Tell Us About Shock Conditions Open
The goal of classifying the shock metamorphic features in meteorites is to estimate the corresponding
\nshock pressure conditions [1]. However, the temperature variability of shock metamorphism is equally
\nimportant and can result in dive…
View article: Petrology and geochemistry of olivine‐phyric shergottites <scp>LAR</scp> 12095 and <scp>LAR</scp> 12240: Implications for their petrogenetic history on Mars
Petrology and geochemistry of olivine‐phyric shergottites <span>LAR</span> 12095 and <span>LAR</span> 12240: Implications for their petrogenetic history on Mars Open
Larkman Nunatak ( LAR ) 12095 and LAR 12240 are recent olivine‐phyric shergottite finds. We report the results of petrographic and chemical analyses of these two samples to understand their petrogenesis on Mars. Based on our analyses, we s…
View article: The Rochechouart 2017-cores rescaled: major features
The Rochechouart 2017-cores rescaled: major features Open
International audience
View article: Introduction to the special issue of <i>Meteoritics & Planetary Science</i> on “Shock metamorphism and high pressure phases in meteorites and terrestrial impactites”
Introduction to the special issue of <i>Meteoritics & Planetary Science</i> on “Shock metamorphism and high pressure phases in meteorites and terrestrial impactites” Open
Interplanetary collisions of planetary bodies represent a fundamental process that affected all planets and moons of the solar system since its formation. They occur on an extremely wide scale of projectile and target sizes, and with a lar…
View article: Investigating the response of biotite to impact metamorphism: Examples from the Steen River impact structure, Canada
Investigating the response of biotite to impact metamorphism: Examples from the Steen River impact structure, Canada Open
Impact metamorphic effects from quartz and feldspar and to a lesser extent olivine and pyroxene have been studied in detail. Comparatively, studies documenting shock effects in other minerals, such as double chain inosilicates, phyllosilic…
View article: Northwest Africa 10658, a Uniquely Shocked Eucrite with a Range of Deformation, Transformation and Recrystallization Effects
Northwest Africa 10658, a Uniquely Shocked Eucrite with a Range of Deformation, Transformation and Recrystallization Effects Open
Impacts are a fundamental geologic process that has influenced the formation and modification of asteroids and planets throughout time. An important part of the impact history of the solar system is recorded in shocked meteorites. The aste…
View article: Shock metamorphism of clay minerals on Mars by meteor impact
Shock metamorphism of clay minerals on Mars by meteor impact Open
A large fraction of clay minerals detected on Mars by infrared remote sensing represent materials exhumed from the subsurface by meteor impact, begging the question of whether the infrared features used to detect the clays are affected by …