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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
Graham Harper Edwards
Bowdoin College, 2014: https://digitalcommons.bowdoin.edu/honorsprojects/12/
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
Graham Harper Edwards and Terrence 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
Graham Harper Edwards and Terrence 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.
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.