• 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 ...

We review available data constraining the extent, volume, age and duration of all major Phanerozoic continental flood basalts (CFB or traps) and oceanic plateaus (OP), together forming the group of large igneous provinces (LIP), going from the smallest Columbia flood basalts at ∼16 Ma to the as yet ill-known remnants of a possible trap at ∼360 Ma in eastern Siberia. The 16 traps (CFB and OP) re...

The Cenozoic Hannuoba basaltic province, 200 km northwest of Beijing, China, is composed of intercalated tholeiitic, transitional and alkalic basalts. Although the alkalic basalts contain abundant upper mantle xenoliths, they range in MgO content from 5.7 to 10.6% MgO. Most of the major and trace element abundance variations in the alkalic basalts can be explained by segregation of a clinopyrox...