Diagenetic controls on fault zone structure along the Sestola-Vidiciatico unit, as an analogue to the shallow subduction megathrust

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dc.contributor.committeeMemberFrench, Melodieen_US
dc.contributor.committeeMemberMorgan, Julien_US
dc.contributor.committeeMemberLee, Cin-Tyen_US
dc.creatorMckenzie, Emory Isaacen_US
dc.date.accessioned2024-01-24T22:32:55Zen_US
dc.date.available2024-01-24T22:32:55Zen_US
dc.date.created2023-12en_US
dc.date.issued2023-12-01en_US
dc.date.submittedDecember 2023en_US
dc.date.updated2024-01-24T22:32:55Zen_US
dc.description.abstractAlong the subduction megathrust, the up-dip limit of the seismogenic zone is thought to occur at 100 to 150 °C and the shallower region hosts diverse modes of fault slip. The transition to the seismogenic zone is thought to occur due to evolving material properties that promote seismicity; however, which properties are responsible and how they evolve is poorly understood. The Sestola-Vidiciatico Unit (SVU) has been interpreted as an analog of the sedimentary component of active subduction megathrusts, near the up-dip transition to seismicity. The SVU accommodated Miocene convergence between the subducting Adriatic plate and the overriding accretionary prisms of the European plate. Deformation was dominantly accommodated within a 500 m thick shear zone along a well-exposed basal decollement and inaccessible roof decollement. Here we evaluate the role that diagenesis of sedimentary rocks plays in controlling fault zone architecture and strain partitioning. We use HAWK pyrolysis to determine new temperature constraints for deformation at multiple outcrops along the basal decollement and show that deformation occurred at temperatures between ~180 to 190 °C at our four field sites. We characterize the macroscopic fault architecture through field measurements and rock composition and microfabrics of the basal decollement using scanning electron microscopy and electron probe microanalysis. Diagenetic reactions such as silicification, chloritization, and pyritization occur in samples from each outcrop. We show that fault architecture is variable even at similar deformation conditions. We quantify the abundance and occurrence of diagenetic reactions and discuss their correlations with variations in fault architecture and deformation textures.en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationMckenzie, Emory Isaac. "Diagenetic controls on fault zone structure along the Sestola-Vidiciatico unit, as an analogue to the shallow subduction megathrust." (2023). Master's thesis, Rice University. https://hdl.handle.net/1911/115407en_US
dc.identifier.urihttps://hdl.handle.net/1911/115407en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.subjectMegathrust, faulten_US
dc.titleDiagenetic controls on fault zone structure along the Sestola-Vidiciatico unit, as an analogue to the shallow subduction megathrusten_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentEarth Scienceen_US
thesis.degree.disciplineNatural Sciencesen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Scienceen_US
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