Timescales of magma transport in the Columbia River flood basalts, determined by paleomagnetic data

• We present a method that can constrain the active lifetime of igneous intrusions. apply this to eight feeder dike segments Columbia River flood basalts. Some were for <1 month, others several years. Magma discharge rates as high 1–8 km 3 day −1 during individual eruptions. Flood basalts represent major events in Earth History, part because they are linked large climate perturbations and mass extinctions. However, durations basalt eruptions, which directly impact potential environmental crises, poorly constrained. Here we use combination paleomagnetic data thermal modeling create magnetic geothermometer (MGT) transport magmatic conduits MGT technique (CRB), demonstrating some actively heating host rocks less than one while other may have been Results suggest eruption rates, localized spatially along-strike segments, . These results help contextualize field evidence contrasting CRB pathway constraining tempo global magmatism is beyond resolution geochronology.