Haley Snyder May
Years participated in RESESS:
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Major: Geology and Mathematics
Academic Affiliation: Lamar University
Research Mentors: Rebecca Flowers and Colin Sturrock
Communications Mentor: Brigitta Rongstad
Haley divides her time between raising her three children and being a full-time student. She is currently earning a Bachelor’s degree in Geology, as well as in Mathematics, and plans to study Geophysics in graduate school. Even as a child, Haley wanted to grow up to become a scientist; she became interested in geology through the introductory courses she took during her earlier college years.
Cool Rocks: an Apatite (U-Th)/He Study of the Trans-Hudson Orogen's Phanerozoic Thermal History
The Trans-Hudson Orogen (THO) in Canada is the most extensively preserved Proterozoic orogenic belt on earth, but much of its post-1.7 Ga history after it became part of the larger Canadian shield remains unknown. Understanding this cryptic history will offer insight into tectonic and geodynamic effects in continental interiors far from plate boundaries. We place important new constraints on the post-orogenic erosional and burial history of the THO using apatite (U-Th)/He (AHe) thermochronology. Single-grain AHe dates from 6 samples in the THO and western Superior Province range from 165 23 to 658 59 Ma. When viewed along a northeast trending 730 km transect, sample locations exhibit an increase in mean AHe date to the northeast from 379 158 to 513 44, then a slight decrease to 439 26 Ma. These data imply cooling, likely via exhumation, from Cambrian through Silurian time in most of the eastern THO. Date-eU patterns suggest that easternmost samples did not experience slow cooling or partial resetting, while increased date dispersion and younger dates in western samples leave open the possibility of a later reheating event at these locations. Future thermal modeling work will utilize other thermochronologic data and geologic constraints from nearby basins to further constrain the THO's Phanerozoic thermal history and will contribute to deciphering the broader history and causes of Canadian Shield burial and erosion during the Phanerozoic.