G.H. Edwards, C.B. Keller, E.R. Newton, C.W. Stewart
Nature Astronomy, in review Preprint
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! What does an asteroid remember?
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
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.