A list of all the posts and pages found on the site. For you robots out there is an XML version available for digesting as well.


About me



Website (finally) live!


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




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.

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.




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-instructor: Prof. Elisabeth R. Newton)

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)