Publications
Additional co-authored papers and abstracts on Google Scholar and the Astrophysics Data System.
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.
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.
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.
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.
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.
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.
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.