The University of Texas logo
\
Real-Time Satellite Remote Sensing with the MAGIC Direct Broadcast Receiving Station at the University of Texas at Austin

Back to UTIG Seminars

Deep -mantle Melting and the Origin of Komatiites

David Sparks
Associate Professor

Texas A&M University

Abstract
Archean komatiites represent the most extreme large-scale mantle melting events recorded in Earthís history. A variety of exotic models have been proposed to generate the ~40% melting of peridotite required to produce some primitive komattite lavas. A combination of simple mantle upwelling/melting models with data from high P/T melting experiments can illuminate the relationship of magma composition to mantle conditions and dynamics. These models show that magmas ranging from modern picrites to high-magnesium komatiites can be generated by melting in high-temperature mantle upwellings (plumes).