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Laser Ablation ICP-MS at the University of Gothenburg. Thomas Zack , Johan Hogmalm , Dave Cornell Department of Earth Sciences, University of Gothenburg, Sweden. Research tool : LA-ICP-MS . Flexibility and innovations possible due to compartmentalization. Microscope. Laser. ICP-MS.

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Laser Ablation ICP-MS at the University of Gothenburg

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Laser Ablation ICP-MS atthe University ofGothenburg

Thomas Zack, Johan Hogmalm, Dave Cornell

Department of Earth Sciences, University of Gothenburg, Sweden


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


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


MethoddevelopmentrelatedtoEconomicGeology

  • Halogens (Br, Cl) in minerals

  • Origin of hydrothermal fluids

  • Breakthroughs:

  • Reductionofbackground (Brtrap)

  • DetectionlimitforBr <5 ppm

  • TestingofglassstandardsforBrand Cl

Köhler et al 2008


MethoddevelopmentrelatedtoEconomicGeology

  • Traceelements (e.g., Au, PGE) in sulphides

  • Invisible gold, oredepositmodels, geometallurgy

  • Breakthroughs:

  • Availibilityofexcellentsulphidestandards (Mass-1, Po-724)

  • Standardizationwithout EMP data


MethoddevelopmentrelatedtoEconomicGeology

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


MethoddevelopmentrelatedtoEconomicGeology

  • Other projects

  • Accessorymineraldating (rutile, monazite, titanite)

  • Magnetite fingerprinting

  • Gold in rutile

  • S andPb isotopes

  • Traceelementmapping

Large et al 2009


CollaborationsrelatedtoEconomicGeology

Boliden Larver2 master

CGS BushveldHammond

Tasman NorraKärre1 master

Agnico Eagle Dalsland1 master

LKAB Kiruna1 bachelor

Du Pont world-wideMcLimans

VedantaGamsbergMoses


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