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U-Series Geochemistry and Comminution Dating
Overview of U-series geochemistry and comminution dating
Posts
LL chondrites – New publication
Published:
Our study of LL chondrite phosphate Pb-Pb and U-Pb thermochronology is published today in Science Advances. The paper is available (open access!) here http://advances.sciencemag.org/cgi/content/full/6/16/eaay8641.
Website (finally) live!
Published:
After many delays and much procrastination, the website is live! I will post updates here on my research as regularly as I can. Thanks for stopping by. -ghe
outreach
portfolio
publications
Geochemical and Stratigraphic Analysis of the Linnévatnet Sediment Record: A Study of Late Holocene Cirque Glacier Activity in Spitsbergen, Svalbard
G.H. Edwards
Bowdoin College, 2014 Web
Honors’ Thesis (Bowdoin College) on the interplay between Late Holocene Arctic climate and glacial sediment delivery to a proglacial lake basin. Fieldwork (2013) conducted through the Svalbard REU program.
Detecting the extent of ca. 1.1 Ga Midcontinent Rift plume heating using U-Pb thermochronology of the lower crust
G.H. Edwards and T. Blackburn
Geology, 2018 PDF Web
We combine U-Pb thermochronology of rutile and apatite from middle-to-lower crustal xenoliths form an Attawapiskat kimberlite with paired crustal thermal and Pb-production diffusion models to ascertain the timescales of plume heating beneath the Superior Craton in midwestern Canada. Thermochronologic data are best fit by model simulations in which the Attawapiskat lithosphere experienced a ca. 1.1 Ga heating event triggered by partial lithosphere removal and mantle temperatures >200 °C in excess of that of ambient mantle, consistent with a model of ∼100 m.y. plume head residence beneath the Attawapiskat region.
Accretion of a large LL parent planetesimal from a recently formed chondrule population
G.H. Edwards and T. Blackburn
Science Advances, 2020 PDF Web
LL chondrite cooling histories require a ≥150-km parent body and accretion concurrent with LL chondrule formation.
Ice retreat in Wilkes Basin of East Antarctica during a warm interglacial
T. Blackburn, G.H. Edwards, S. Tulaczyk, M. Scudder, G. Piccione, B. Hallet, N. McLean, J.C. Zachos, B. Cheney, J.T. Babbe
Nature, 2020 PDF Web
Press coverage in National Geographic
U-series isotopics of subglacial precipitates from beneath the East Antarctic Ice Sheet (EAIS) record an open-system event ca. 400,000 years ago in the subglacial Wilkes Basin. Our data and models support ice retreat and seawater incursion during this time, suggesting that the Pleistocene EAIS was not as stable as previously assumed. These findings bear important implications for future EAIS stability in a warming climate.
Terrestrial evidence for ocean forcing of Heinrich events and subglacial hydrologic connectivity of the Laurentide Ice Sheet
G.H. Edwards, T. Blackburn, G. Piccione, S.Tulaczyk, G.H. Miller, C. Sikes
Science Advances, 2022 PDF Web
Subglacial mineral precipitates record ocean forcing of Heinrich events and widespread subglacial groundwater connectivity.
An early giant planet instability recorded in asteroidal meteorites
G.H. Edwards, C.B. Keller, E.R. Newton, C.W. Stewart
Nature Astronomy, in review Web Preprint Code
We use a Bayesian statistical code to constrain the timescales of giant planet migration and asteroid belt bombardment in the early solar system. Our results associate giant planet migration with the dissipation of the gaseous protoplanetary disk.
The preprint was summarized by Astrobites, and I was quoted in two recent articles on the topic of giant planet migration in Science Magazine and Sky & Telescope.
Uranium-series isotopes as tracers of physical and chemical weathering in glacial sediments from Taylor Valley, Antarctica
G.H. Edwards, G.G. Piccione, T. Blackburn, S. Tulaczyk
Chemical Geology, in review Preprint Code Data
Uranium series isotopes are sensitive tracers of both chemical and physical weathering. We report U-series data from fine-grained sediments form Taylor Valley, Antarctica that were deposited over the course of the last million years. Using novel numerical techniques we interpret the coupled chemical-physical weathering histories and show that Taylor Glacier has been eroding into Taylor Valley over the course of the Pleistocene.
research
talks
teaching
Geologic Principles
Teaching Assistant, UC Santa Cruz, Earth & Planetary Sciences, 2018
Introductory Earth Science coarse covering the fundamentals of geosciences, with an emphasis on solid Earth topics.
Instructor: Prof. Terrence Blackburn.
Geochemistry of the Solar System
Teaching Assistant, UC Santa Cruz, Earth & Planetary Sciences, 2018
Overview of the meteorite record and the processes of solar system evolution and planetary formation from a geochemical perspective.
Instructors: Profs. Myriam Telus and Terrence Blackburn.
Principles of Field Geology
Teaching Assistant, UC Santa Cruz, Earth & Planetary Sciences, 2019
Field-based course focusing on fundamental geologic principles, field skills, and the creation of geologic maps.
Instructor: Dr. Hilde Schwartz
Evolution of Earth
Teaching Assistant, UC Santa Cruz, Earth & Planetary Sciences, 2020
Overview of Earth system processes and history for Earth science majors.
Instructors: Profs. Paul Koch and Terrence Blackburn.
Measuring Earth’s 4.5 Billion-Year History
Teaching Assistant, UC Santa Cruz, Earth & Planetary Sciences, 2021
Radiogenic and stable isotope geochemistry: isotopic systems and their applications in the Earth sciences.
Instructors: Profs. Terrence Blackburn and Jim Zachos.
Exploring Our Universe
Lecturer (Instructor of Record), Dartmouth College, Physics & Astronomy, 2023
Introductory astronomy course covering the fundamentals of astronomy with an emphasis on the diversity of astronomical objects and how we have described them with observational techniques. (Co-instructors: Prof. Elisabeth R. Newton, Prof. Aaron L. Dotter).
The Stretch
Co-Instructor, Dartmouth College, Earth Sciences, 2023
Glaciology, paleoclimate, and surface mapping segment (Oct. 15–23) of a full-term field geology course. Field sites in the Eastern Sierra Nevada of California, including Long Valley, Owens Valley, and the Mono Basin. Co-instructor: Prof. Meredith Kelly)
Exploring Our Solar System
Lecturer (Instructor of Record), Dartmouth College, Physics & Astronomy, 2024
Introductory astronomy course covering the fundamentals of astronomy and planetary science.