32-9 Characterization of Fluid Pathways in Detachment Shear Zone Using Comparative Structure-From-Motion Photogrammetry and Field Measurements

Session: Latest Research Advances in Structural Geology and Tectonics (Posters)

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Abstract:

Fluids play a vital role in weakening the rheology of detachment shear zones. However, our understanding of how surface-derived water circulates beyond the brittle-ductile transition and interact with the deforming rocks remains limited. Interaction between surface fluids and deforming rocks is well documented in the Miocene Raft River detachment shear zone (Utah). We hypothesize that large fault and fracture networks may have acted as fluid pathways for surface fluids to migrate to mid-crustal levels. Our main challenge is conducting systematic faults and fractures analysis in the area due to outcrop accessibility. The Raft River detachment shear zone is well exposed in the Clear Creek Canyon; however, the canyon is characterized by steep vertical cliffs and poorly exposed fault surfaces due to dense vegetation. To address this, we will use a combination of remote sensing (satellite imagery), drone (aerial imagery), and field work to conduct our structural analysis. Specifically, we will conduct structure-from-motion photogrammetry to reconstruct outcrops for our analysis. Field data will then be compared to virtual outcrop measurements for accuracy. This approach will allow us to conduct a structural analysis over a much larger area than what can be accessed the field, thereby significantly improving the accuracy of our structural analysis. Our combined remote sensing and field approach will improve our understanding of fluid pathways within the crust. 

Geological Society of America Abstracts with Program. Vol. 57, No. 6, 2025

doi: 10.1130/abs/2025AM-6965

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