( ( ( ( Use ( of ( radiogenic isotopes ) ) ) and ) ( ( trace ( elements ( as tracers ) ) ) ( to ( ( ( study ( ( the ( ( age and ) petrogenesis ) ) ( of ( ( lavas and ) magmas ) ) ) ) , ) ( with ( applications ( to ( ( the ( geochemical evolution ) ) ( of ( ( the ( earth 's ) ) ( ( crust and ) mantle ) ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (VP (VP (VB Use) (PP (IN of) (NP (JJ radiogenic) (NNS isotopes)))) (CC and) (VP (VB trace) (NP (NP (NNS elements)) (PP (IN as) (NP (NNS tracers)))) (S (VP (TO to) (VP (VB study) (NP (NP (DT the) (NN age) (CC and) (NNS petrogenesis)) (PP (IN of) (NP (NNS lavas) (CC and) (NNS magmas)))) (, ,) (PP (IN with) (NP (NP (NNS applications)) (PP (TO to) (NP (NP (DT the) (JJ geochemical) (NN evolution)) (PP (IN of) (NP (NP (DT the) (NN earth) (POS 's)) (NN crust) (CC and) (NN mantle)))))))))))) (. .)))
Use of radiogenic isotopes and trace elements as tracers to study the age and petrogenesis of lavas and magmas, with applications to the geochemical evolution of the earth's crust  and mantle.
(ROOT (S (NP (NNP Magma)) (VP (VBZ comes) (PP (IN toward) (NP (NP (NN earth) (POS 's)) (NN crust))) (PP (IN through) (NP (JJ mantle) (NNS plumes)))) (. .)))