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Vital new understanding of the origin of mineral deposits around the world has resulted.The isotopic composition of sulphur in the giant base metal ore bodies which supply most of the world's copper, zinc, lead and silver is sensitive to whether that sulphur is derived from sediments or from hot fluids originating deep in the Earth.Knowing the source of the sulphur for each ore body helps in determining why metals were deposited and directs the exploration strategy adopted in the search for new ore bodies.Exploration of oil is a technically sophisticated and fiercely competitive international business.Diorites, Qtz-diortes and their fractionates (i.e.: granodiorites and tonalites) define a possible “trend of pulses” as supported by age-composition relations.Granites are plotted defining a parallel trend possibly related by fluid migration fractionation. subvolcanic) evolution from individual pulses of magma at late stages of fractionation.

Interpretative sketch of emplacement of the northern part of the Northern Patagonian batholith during the Middle Jurassic, according to the data presented in this work. The block diagram above the map illustrates the proposed mechanism of emplacement in the upper crust of the Cordilleran granitoids in the Bariloche area during the Middle Jurassic.My research focuses on understanding the timescales of magmatic processes and the sources of crystal diversity in magmatic systems.To accomplish this, I use radiometric dating (238U-230Th, 238U-206Pb, 40Ar-39Ar, and U-Th/He) and chemical analysis of minerals to investigate the temporal and compositional history of magmas.Samples from the Patagonian batholith and from the Peninsular Ranges batholith in North America are plotted in the background for comparisons.I co-manage the SHRIMP-RG ion-microprobe at Stanford University, where I oversee operation of the laboratories and work closely with Stanford scientists and students as well as visiting scientists to undertake measurements on the SHRIMP-RG.

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