MARRYING LARGE IGNEOUS PROVINCES AND MASS EXTINCTION EVENTS: A PERFECT MARRIAGE OR A ROCKY RELATIONSHIP?
Rather than magma volume itself, global environmental disturbance is thought to be caused by aerosol emissions associated with the magmatism. Debate continues as to which volcanic gas(es) are most important in causing climate modification, but recent attention has turned to the potentially substantial quantities of F, Cl, and Br emissions that cause substantial catalytic destruction of stratospheric ozone. An important point is the sustained magmatic and therefore aerosol output, both at individual super-eruption (month to decadal eruption duration) and province scales (>1 Myr) for LIPs. Major asteroid impacts are generally viewed as single-pulse events with effects lasting for up to a few decades. By contrast, the high-frequency (~1000-10,000 yr recurrence intervals) of large magnitude (>M8) basaltic and silicic supereruptions, fed by a substantially larger sub-volcanic intrusive component, which further contribute to aerosol emissions through magma degassing and contact metamorphic effects in sedimentary basins, can collectively provide the opportunity for persistent atmospheric and climatic modification, both at tropospheric and stratospheric levels, environmental stress and prevention of species recovery.