I am a geologist focused on tectonic systems and the feedbacks between tectonic processes, surface processes, and depositional processes. I strive to combine numerical and conceptual models with quantitative data on geologic processes to test hypotheses. I have particular expertise in:
1) The application and modeling of low-temperature thermochronology in active tectonic environments, both extensional and compressional.
2) The use of basin records (seismic and well data) to reconstruct basin histories.
3) Numerical modeling of isostatic, exhumational, and erosional processes.
With Ph.D. student Sarah Gelman
Supported by NSF-EAR Tectonics grant (awarded 2024)
Evaluating vertical movements and heat flow in poly-phase basins is challenging due to multiple mechanisms driving subsidence and potentially influencing lithospheric strength. The Arctic Alaska basin is a classic example of a poly-phase basin with overprinting tectonic events: Jurassic extension evolved to and overlapped with Cretaceous shortening. This proposal develops numerical models to investigate vertical movements and heat flow related to multiple subsidence events within tectonically-driven basins.
Supported by NSF-EAR Geomorphology and Land-use Dynamics grant, awarded 2024 in collaboration with co-PI Marissa Tremblay
This research aims to place new constraints on the timing of escarpment retreat in southeast Australia, with the broader goal of reevaluating the cause of escarpment formation and retreat. We will use apatite 4He/3He thermochonology to place constraints on the timing and magnitude of cooling, which will inform new, paired landscape evolution and thermo-kinematic models of escarpment retreat.
With MS student Kris Symanski.
Supported by a grant from ACS Petroleum Research Fund (PRF# 66426-DNI8)
North America hosted numerous orogenies throughout the Paleozoic. The timing and extent of these orogenic events are often determined by investigations of the ancient hinterlands, which can be heavily eroded, vegetated, and/or overprinted thus often present incomplete chronicles. Basins preserve evolutionary records of tectonics, erosion, deposition, subsidence, and temperature that are incomplete in exposed hinterlands. Ongoing work utilizes the basin history of Paleozoic foreland basins to investigate the paleotopography, timing, and extent of ancient orogenic hinterlands.
Photo of the Country Line Complex - a mylonitic gneiss in the core of the shear zone with ductile kinematic indicators
With MS student Trevor Gunn.
Supported by USGS EDMAP grants.
The Hyco Shear Zone (SZ) in the Piedmont province of North Carolina is a northeast-southwest trending terrane boundary interpreted to be a wide, ductile thrust formed during Alleghanian (late Paleozoic) deformation. In northern North Carolina, the Hyco SZ juxtaposes Neoproterozoic hanging wall rocks of the Carolina terrane with footwall rocks of the Ordovician Milton terrane and the Churchland pluton of uncertain age.
In coordination with colleagues at the North Carolina Geological Survey, we are mapping several swaths of the HSZ, with accompanying geochronology.
With MS student Cam Siegel
How has the Colorado River drainage interacted with the southern Great Basin? How do fault-driven landscapes record the evolution of fault slip? How has the Basin and Range interacted with the surrounding tectonomorphic regions?
Ongoing work utilizes low-temperature thermochronology, numerical modeling, and subsurface records to investigate the feedbacks between faulting, geomorphology, and basin deposition in the Basin and Range.
How do landscapes, deformation, and foreland deposition coevolve in a convergent orogen?
I have ongoing work on the relationships between lithospheric deformation, basin development, and surface processes in the Pyrenees Mountains. Initial research constrained the first-order topographic evolution of the orogen using flexural modeling, basin analysis, and structural restorations. Combining the topographic history with extensive thermochronologic data, I am using thermo-kinematic modeling (Pecube) and surface processes modeling (Fastscape) to understand the spatio-temporal evolution of exhumation, erosion, and deformation within the Pyrenees. This remains an area of active research.
Despite decades of intense research in one of the most prolific hydrocarbon producing areas of the world, the early tectonic evolution of the Gulf of Mexico is still a matter of debate. How did the margin proceed from rift to drift? How did salt deposition and tectonics influence the basin evolution? What was the paleogeography of the GoM prior and during salt deposition?
What controls the fracture attributes in different rock types? How can fractures influence landscapes? For my Master's research, I examined fault related fractures and diagenesis in the Torridonian Applecross Formation of the NW Highlands of Scotland. I found that the detrital composition and diagenesis of a rock influence the mechanical properties, which in turn produce distinctive fracture populations. The glacially influenced landscapes in the Scottish Highlands reveal a strong control of bedrock structure on the geomorphology.