A5007059519- Geology and Paleoclimatology Research
- Geological and Geochemical Analysis
- Cryospheric studies and observations
- Planetary Science and Exploration
- earthquake and tectonic studies
- Methane Hydrates and Related Phenomena
- High-pressure geophysics and materials
- Geochemistry and Geologic Mapping
- Hydrocarbon exploration and reservoir analysis
- Astro and Planetary Science
- Geological and Geophysical Studies
- Isotope Analysis in Ecology
- Geological Studies and Exploration
- Geological formations and processes
- Pleistocene-Era Hominins and Archaeology
- Nuclear Physics and Applications
- Climate change and permafrost
- Geomagnetism and Paleomagnetism Studies
- Archaeology and ancient environmental studies
- Winter Sports Injuries and Performance
- Landslides and related hazards
- Paleontology and Stratigraphy of Fossils
- Evolution and Paleontology Studies
- Atomic and Subatomic Physics Research
- Marine and environmental studies
Purdue University West Lafayette
2016-2025
ORCID
2021
University of California, Berkeley
2013-2019
Berkeley Geochronology Center
2014-2019
Planetary Science Institute
2014-2019
Scottish Universities Environmental Research Centre
2017-2019
Pavia nel Cuore
2019
The University of Texas at Austin
2014
Significance The Himalaya–Tibet plateau system formed by collision between India and Asia that began ca. 50 Ma is still ongoing today. Despite being the most studied example of continent–continent collision, evolution topography in Himalaya Tibetan remains an area vigorous debate active research. We present geochemical data on cooling history granites from southern plateau, which indicate exhumation these therefore erosion rates this region decreased significantly ∼10 after ∼5 rapid erosion....
Research Article| April 01, 2015 Stratigraphy and geochronology of the Tambien Group, Ethiopia: Evidence for globally synchronous carbon isotope change in Neoproterozoic Nicholas L. Swanson-Hysell; Swanson-Hysell 1Earth Planetary Science Department, University California, Berkeley, California 94720, USA Search other works by this author on: GSW Google Scholar Adam C. Maloof; Maloof 2Department Geosciences, Princeton University, Princeton, New Jersey 08544, Daniel J. Condon; Condon 3Natural...
Research Article| September 14, 2017 Paleocene to Pliocene low-latitude, high-elevation basins of southern Tibet: Implications for tectonic models India-Asia collision, Cenozoic climate, and geochemical weathering Miquela Ingalls; Ingalls † 1Department the Geophysical Sciences, The University Chicago, Illinois 60637, USA †ingalls@uchicago.edu. Search other works by this author on: GSW Google Scholar David Rowley; Rowley Gerard Olack; Olack Brian Currie; Currie 2Department Geology &...
Abstract Cosmic ray exposure (CRE) ages provide information about the parent bodies and source regions of meteorite classes. Cosmogenic noble gases are often used to quantify time scales ranging from tens ka hundreds Ma. The production rate cosmogenic is primarily controlled by a meteorite's chemical composition. Historically, an average composition for entire class or subgroup was calculate rates. At scale needed gas measurements, however, some meteorites exhibit mineral abundance...
Abstract Cosmogenic nuclide dating is an essential component of studying Earth surface processes, but it requires knowledge how production rates vary in time and space. Typically, are calibrated at sites with independently well‐constrained exposure histories then scaled to other interest using scaling frameworks that account for spatial temporal variations the secondary cosmic‐ray flux Earth's surface. To date, schemes terrestrial cosmogenic have been developed Quaternary, yet applications...
Abstract Crater chronology functions are used to estimate absolute surface ages using the number density of observed craters. The calibration is done crater counts on regions with radiometrically dated samples. Both Neukum Production Function (NPF) and Robbins (RPF) contain lunar anchored by Apollo Luna samples that have measured known be from surfaces densities. However, these were constructed different data assumptions for their respective counts, differ in rate decline during Imbrian...
During the Last Glacial Maximum (26,000-19,000 years B.P.; Clark et al. 2009), Patagonian Ice Sheet (PIS) formed a contiguous ice cap over southern Andes from 38° to 55° S, with sea level equivalent 1.5 m (Davies al., 2020). Despite recent progress in reconstructing PIS configuration during last glacial cycle 2020), constraints on timing of retreat and thinning deglaciation remain limited. In order understand how responds centennial millennial scale changes climate, we...
Understanding glacier changes during the Holocene provides key insights into climate variability and cryosphere dynamics. Villarrica volcano (39°S), situated within Southern Volcanic Zone (SVZ) of Chile, preserves a well-defined record past glacial extents, with moraines marking post-Last Glacial Maximum (LGM) extents. Despite its potential, history SVZ still remains poorly constrained, limiting our understanding glacier-climate interactions last deglaciation Holocene. We present...
Abstract The earliest history of the lunar dynamo is largely unknown and has important implications for thermal state Moon physics generation. sample with oldest known paleomagnetic record 4.25 billion year old (Ga) troctolite 76535. Previous studies unoriented subsamples 76535 found evidence a field paleointensity several tens microteslas. However, lack mutual subsample orientation prevented demonstration that magnetization was unidirectional, key property thermoremanent magnetization. Here...
Abstract Climate change and tectonic activity through erosion control Earth’s topography, much of which is shaped by river incision. The Yarlung River has dissected the Indian‐Asian Collision Zone, one largest rivers. However, its rate history how it interacts with regional tectonics remain ambiguous. Here, we apply low‐temperature thermochronometry thermal‐kinematic models for bedrock samples from River. Our analysis reveals two stages relatively fast exhumation occurred in different parts...
Abstract The Tonian-Cryogenian Tambien Group of northern Ethiopia is a mixed carbonate-siliciclastic sequence that culminates in glacial deposits associated with the first Cryogenian glaciations—the Sturtian “Snowball Earth.” deposition occurred atop arc volcanics and volcaniclastics Tsaliet Group. New U-Pb isotope dilution–thermal ionization mass spectrometry (ID-TIMS) dates demonstrate transition between Groups at ca. 820 Ma western exposures 795 eastern exposures, which consistent west to...
Surface nitrate concentration is a potentially useful diagnostic in reconstructing the past circulation of high‐latitude North Atlantic waters. Moreover, nutrient consumption surface impacts atmospheric carbon dioxide. To reconstruct conditions subpolar region during last ice age, record foraminifera‐bound δ 15 N was measured Neogloboquadrina pachyderma (sin.) from core V28‐73 south Iceland (57.2°N, 20.9°W). Foraminifera‐bound up to 2‰ lower age than Holocene, suggesting as much ~25% less...
Abstract While proxy records have been used to reconstruct late Quaternary climate parameters throughout the European Alps, our knowledge of deglacial conditions in Maritime Alps is limited. Here, we report temperatures recorded by a new and independent geochemical technique—cosmogenic noble gas paleothermometry—in since last glacial maximum. We measured cosmogenic 3 He quartz from boulders nested moraines Gesso Valley, Italy. Paired with 10 Be measurements diffusion experiments on same...
The diffusion properties of noble gases in minerals are widely used to reconstruct the thermal histories rocks. Here, we combine density functional theory (DFT) calculations with laboratory experiments investigate controls on helium quartz. DFT for perfect α-quartz predict substantially lower activation energies and frequency factors than observed experiments, especially [001] direction. These results imply that no could be retained quartz at Earth surface temperatures, which conflicts...
Abstract Synthesizing uniform and high concentrations of 3 He within minerals via high‐energy proton irradiation is paramount for 4 He/ thermochronology helium diffusion kinetic studies. Proton irradiations geological material have hitherto exclusively been routinely conducted at the Francis H. Burr Therapy Center (FHB); we thus explored alternative protocols two European‐based facilities with intention to improve accessibility efficiency in obtaining data. We a single Paul Scherrer...