Determination of trace element zoning in mineral and biological samples using LA-ICPMS transect line profiling

RURIK ROMERO; MATHIEU LEISEN; FERNANDO BARRA PANTOJA; DIEGO MORATA; ESTEBAN AVIGLIANO; EDUARDO SALAZAR

Austin, Texas

Congreso; North American Wholesale Lumber Association; 2017

Determinationof traceelement zoning in mineral and biological samplesusing LA-ICPMStransect line profilingRurik Romero1, Mathieu Leisen1, Fernando Barra1, Diego Morata1, Esteban Avigliano2, Eduardo Salazar11 Departmentof Geology and Andean Geothermal Center of Excellence (CEGA), FCFM, Universidadde Chile, Plaza Ercilla 803, Santiago, Chile.2 Instituto de Investigaciones en Producción Animal(INPA-CONICET-UBA), Facultad de Ciencias Veterinarias, Universidad de BuenosAires (UBA), Av. Chorroarín 280, Buenos Aires, Argentina.rromero@ing.uchile.clTransverse profile analysis on minerals and biologicalsamples has been developed in the Mass Spectrometry Laboratory of the AndeanGeothermal Center of Excellence (CEGA), Universidad de Chile. The equipment usedin all the analyses is an ArF 193nm laser Analyte G2 ablation system coupled toan ICP-MS iCAP Q.We have successfully performed transverse profiles indifferent silicate minerals such as olivine, pyroxene and plagioclase from thesouthern Chilean volcanic arc. Different reference materials, such as NIST 610and BHVO-2G, have been analyzed to calibrate and validate the analyticalprocedure. Variations of trace element concentrations in these minerals areused to have a better understanding of the magmatic reservoir evolution.Transverse profile analysis was also applied onmagnetite grains from several orebodies from Kiruna-type deposits in northernChile. Concentrations of rare earth elements and critical geochemical tracers suchas Cr, V and Mg were determined in zoned magnetite grains. Preliminary datashows a distribution which is consistent with an early magmatic stage ofcrystal growth and a possible later hydrothermal rim.Marine biology applications have also been developed inour lab. Specifically, we have performed trace element transects on sagittal otolithsfrom Catfish Genidens Barbusbarbus.Using the MACS-3 standard, transects of Sr:Ca and Ba:Ca ratios were measured.These measurements are a powerful tool to stockidentification and to determine the annual migratory patternsbetween different fluvio-marine environments such as freshwater, estuarine andmarine waters.