外文资料The application of laser ablation microprobe-inductively coupled plasma-mass spectrometry (LAM-ICP-M.pdfVIP

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外文资料The application of laser ablation microprobe-inductively coupled plasma-mass spectrometry (LAM-ICP-M.pdf

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ChemicalGeology, 109 (1993) 1-8 1 Elsevier Science Publishers B.V., Amsterdam [NA] Letter Section The application of laser ablation microprobe-inductively coupled plasma-mass spectrometry (LAM-ICP-MS) to in situ (U)-Pb geochronology Brian J. Fryer, Simon E. Jackson and Henry P. Longerich Department of Earth Sciences and Centre for Earth Resources Research, Memorial University of New/bundland. St. Johns, Nfld. A IB 3X5, Canada (Received February 22, 1993; revised and accepted April 23, 1993 ) ABSTRACT The direct dating of single pitchblende and zircon grains is reported, using a laser ablation microprobe (LAM) which has been coupled to a commercial inductively coupled plasma-mass spectrometer (ICP-MS). The system has been de- signed for micro sampling minerals in petrographic sections. Major advantages of this technique, compared to other in situ dating techniques, are the: ( 1 ) separation of the sampling process from the excitation (dissociation and ionization) processes; (2) minimal complex and variable ion species in the mass analyzer; (3) ability to monitor and adjust the analysis characteristics during ablation; (4) ease of isolation and analysis of the isotopic data at all stages during an abla- tion sampling; ( 5 ) ability to date diverse materials; and (6) relatively low capital costs. Direct dating of uranium-rich phases such as pitchblende is rapid, precise and requires no chemical pretreatment. The ability to analyze small areas (diameters of 20-30 #m) facilitates studies on the timing of primary and secondary U mineralization. Micro sampling of an individual pitchblende grain from the complex Collins Bay uranium deposit in Saskatchewan, Canada, illustrates this new techniques potential and the equivalence of conventional and LAM-ICP-MS age determinations. Analysis of 100-/tm-diameter late Archean zircons further demonstrates that LAM-ICP-MS has the potential to become a rival of competing techniques for regional reconnaissance a