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Laser Ablation ICP-MS at the University of Gothenburg

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  1. Laser Ablation ICP-MS atthe University ofGothenburg Thomas Zack, Johan Hogmalm, Dave Cornell Department of Earth Sciences, University of Gothenburg, Sweden

  2. Research tool: LA-ICP-MS Flexibilityandinnovationspossible due tocompartmentalization Microscope Laser ICP-MS Carrier gas Sample holder Laser: 213 nmNd:YAGlaser, fullyautomizedstagecontrol Sample holder: Large Format Cell (10 x 10 cm) (bigsamples, fast wash-out, bettersensitivity) Carrier gas: Addition ofnitrogentoenhancetransportefficiency ICP-MS: Agilent 7500a; 2nd vacuum pump forenhancedsensitivity

  3. Currentstatusandfuture plan 2006 2014? + Reaction gas (O2) 16O2+ 16O2+ 32S+ 48Ca/48Ti, 36Ar12C 32S16O+ • Agilent 7500a • Li to U (not H, C, N, O) • ng/g @ 100 µm, µg/g @ 4 µm • ..polyatomicinterferences • Agilent 8800 • Tackle „difficultelements“: • …S, P, Cl, As, Se, Br • 10x more sensitive! • .polyatomicinterferences 32S+  32S16O+ 48Ca/48Ti, 36Ar12C Q2 (m/z 48) – rejects all ions apart from m/z 48 Q1 (m/z 32) – rejects all ions apart from m/z 32

  4. MethoddevelopmentrelatedtoEconomicGeology • Halogens (Br, Cl) in minerals • Origin of hydrothermal fluids • Breakthroughs: • Reductionofbackground (Brtrap) • DetectionlimitforBr <5 ppm • TestingofglassstandardsforBrand Cl Köhler et al 2008

  5. MethoddevelopmentrelatedtoEconomicGeology • Traceelements (e.g., Au, PGE) in sulphides • Invisible gold, oredepositmodels, geometallurgy • Breakthroughs: • Availibilityofexcellentsulphidestandards (Mass-1, Po-724) • Standardizationwithout EMP data

  6. MethoddevelopmentrelatedtoEconomicGeology Traceelements (e.g., Au, PGE) in sulphides

  7. MethoddevelopmentrelatedtoEconomicGeology • Other projects • Accessorymineraldating (rutile, monazite, titanite) • Magnetite fingerprinting • Gold in rutile • S andPb isotopes • Traceelementmapping Large et al 2009

  8. CollaborationsrelatedtoEconomicGeology Boliden Larver 2 master CGS Bushveld Hammond Tasman NorraKärre 1 master Agnico Eagle Dalsland 1 master LKAB Kiruna 1 bachelor Du Pont world-wideMcLimans VedantaGamsberg Moses