| The high-volume, short-duration magmatism that forms large igneous provinces (LIPs), such as the Miocene Columbia River Flood Basalts (CRFBs), has been linked to paleo-biospheric perturbations. To accurately assess the climatic impacts of these LIP events, the durations of individual eruptions need to be measured at the scale of years-decades, i.e., 2-3 orders of magnitude higher resolution than the highest-precision geochronometers. I use the thermal footprints of dikes that fed CRFB eruptions (measured by thermochronology and stable isotopes) to quantify the duration of magma flow through these dikes, better understand the transport of magma across multiple dike segments, and measure the extent of hydrothermal circulation during dike emplacement. Numerical modeling of thermochronologic ages yields magma flow durations of 2.2-11 years at one dike segment. Additional thermochronologic transects suggest that there was spatial variability in dike-adjacent heat transfer. Finally, hydrogen isotope data suggests that dike emplacement triggered the circulation of meteoric fluids. |