A5058861600- Geological and Geochemical Analysis
- earthquake and tectonic studies
- Geochemistry and Geologic Mapping
- High-pressure geophysics and materials
- Geology and Paleoclimatology Research
- Hydrocarbon exploration and reservoir analysis
- Mineralogy and Gemology Studies
- Nuclear materials and radiation effects
- Geological Studies and Exploration
- Radioactive element chemistry and processing
- Marine and environmental studies
- Geomagnetism and Paleomagnetism Studies
- Geological Modeling and Analysis
- Advanced Materials Characterization Techniques
- Geological formations and processes
- Landslides and related hazards
- Paleontology and Stratigraphy of Fossils
- Rock Mechanics and Modeling
- Metal Extraction and Bioleaching
- Archaeology and Natural History
- Geochemistry and Elemental Analysis
- Geological and Geophysical Studies Worldwide
- Iron and Steelmaking Processes
- Geophysical and Geoelectrical Methods
- Coal Properties and Utilization
Bowdoin College
2014-2023
University of California, Santa Barbara
2009-2012
Messiah College
2011
Stanford University
2010
University of California, Santa Cruz
2009
Cellular solids (e.g., foams and honeycombs) are widely found in natural engineering systems because of their high mechanical efficiency tailorable properties. While these materials often based on polycrystalline or amorphous constituents, here we report an unusual dual-scale, single-crystalline microlattice the biomineralized skeleton knobby starfish, Protoreaster nodosus. This structure has a diamond-triply periodic minimal surface geometry (lattice constant, approximately 30 micrometers),...
Atom probe yields geologically meaningful ages from nanoscale Pb-enriched dislocation loops in discordant zircon.
Atom probe tomography (APT) is used to quantify atomic-scale elemental and isotopic compositional variations within a very small volume of material (typically <0.01 µm3). The analytical ideally contains specific or microstructural targets that can be placed the context previously characterized surface in order facilitate correct interpretation APT data. In this regard, careful targeting preparation are paramount ensure desired target, which often smaller than 100 nm, optimally located...
Abstract To evaluate the mechanisms driving nanoscale trace element mobility in radiation-damaged zircon, we analyzed two well-characterized Archean zircons from Kaapvaal Craton (southern Africa): one zircon remained untreated and other was experimentally heated laboratory at 1450 °C for 24 h. Atom probe tomography (APT) of reveals homogeneously distributed elements. In contrast, APT shows that Y, Mg, Al, Pb+Yb segregate to a set morphologically crystallographically distinct cluster...
Research Article| December 01, 2010 Growth conditions of symplectic muscovite + quartz: Implications for quantifying retrograde metamorphism in exhumed magmatic arcs Emily M. Peterman; Peterman * Department Geological & Environmental Sciences, Green Earth Sciences Building, 367 Panama Street, Stanford University, Stanford, California 94305-2115, USA *E-mail: emily.peterman@stanford.edu. Search other works by this author on: GSW Google Scholar Marty Grove Geology (2010) 38 (12): 1071–1074....
Highly restitic garnet-kyanite-phlogopite metapelitic schists from the Goshen Dome of western Massachusetts contain: a population prograde monocrystalline, megacrystic garnet, some with significant P in substitution for Si; precipitates hydroxylapatite and rutile; <1 μm zircon crystals undetermined origin abundance on order 105/mm3. The unusual content abundant internal precipitate suite are similar to features reported garnet ultrahigh-pressure (UHP) mantle settings, suggesting potential...
Abstract Gneiss domes are an integral element of many orogenic belts and commonly provide tectonic windows into deep crustal levels. in the New England segment Appalachian orogen have been classically associated with diapirism fold interference, but alternative models involving ductile flow proposed. We evaluate these Dome belt western U‐Th‐Pb monazite, xenotime, zircon, titanite petrochronology major trace thermobarometry. These data constrain distinct pressure–temperature–time (P‐T‐t)...
Abstract Cathodoluminescence (CL) images of kyanite reveal several internal textures, including sector zoning, oscillatory and cross‐cutting relationships among different domains. Many textures observed in correspond to discrete events, thereby connecting the pressure–temperature ( P–T ) history rock. To evaluate record metamorphism preserved by kyanite, metapelites were selected from three orogens that reflect conditions ranging amphibolite ultrahigh‐pressure (UHP) facies. Cross‐correlation...
Detailed bedrock mapping, structural geology, meta-igneous whole rock geochemistry, and U-Pb geochronology from rocks sampled along a portion of complexly deformed tectonic boundary between the Ordovician peri-Gondwanan Liberty-Orrington belt Silurian syn-orogenic strata Fredericton trough (a.k.a. Dog Bay Line) in mid-coastal Maine aid deciphering Silurian-Devonian evolution region. The new results provide constraints on several key events. First, initial terrane juxtapositioning occurred...