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Тезисы международной конференции

Рудный потенциал щелочного, кимберлитового

 и карбонатитового магматизма

Abstracts of International conference

Ore potential of alkaline, kimberlite

and carbonatite magmatism

Mass-spectrometry with ionization by inductively-coupled plasma and laser sampling system: application to geological problems.

Kapitonov I.N.*, Goltsin N.A.*, Lokhov K.I*., Sergeev S.A.*

* A.P. Karpinsky Russian Geological Research Institute, ,St-Petersburg, Russia.

** **SPb state university,St-Petersburg, Russia.



The studies by laser sampling system (laser ablation, LA) combined with inductively-coupled plasma mass-spectrometer are relatively new, but very informative method as in geologic investigations as and in many other fields of science. The absence of complex chemical sample preparation and the ability to see the object of study during the analysis, ability to study heterogeneous objects makes the method particularly attractive.

At the present time, secondary-ion mass spectrometers (SIMS) have the best characteristics in terms of locality. They allow you to obtain a spatial resolution of of several microns along the sample surface (determined by the diameter of the beam of primary ions) and nanometer resolution level in the stratified analysis into the sample. Laser ablation system does not have such a good locality,  but nevertheless are becoming more widely available. This is due to several factors, among which include the following:

Lower Cost

The smaller size

Higher productivity

Finally, significantly higher precision in the isotope studies (by using multicollector) allows solve some isotope tasks by LA-ICPMS at the level, which is not available for modern SIMS analytical systems.

At the centre of isotopic research of A.P. Karpinsky Russian Geological Research Institute (VSEGEI) LA-ICPMS  complex equipped with laser ablation system DUV-193 with ArF excimer laser, mass-spectrometer Element-2 (ICPMS) and multicollector mass-spectrometer Neptune (MC-ICPMS).

The report will be submitted to the experience of more than 7 years of operation of this complex and its analytical application for solving geochronological problems such as U-Pb dating of high-uranium zircons, detrital zircon, baddeleyite, high-uranium inclusion in a minerals [e.g. Alexeev N.L, e.a, 2010; Chumakov, N, 2011; N.V. Rodionov, e.a, 2012], high-precision determination of lead isotope ratios in lead-containing sulfides. Along with the objectives of geochronological method, the laser ablation is widely used in centere of isotopic research for solving problems of the rocks and minerals genesis. The exsamples and methods of Hf isotope composition in the zircon [e.g. Lokhov K.I. , e.a, 2009] and baddeleyite, rare earth elements determination in the same minerals [e.g. N.V. Rodionov, e.a, 2012], and in such mineral as apatite, scheelite and garnet.

The same method of laser ablation has worked well in measuring of osmium isotopic composition in osmium minerals and osmium-containing sulfides, rapid monitoring of the isotopic composition of carbon in shungite [I. Kapitonov,2008], measurements of trace elements in various minerals[e.g. J. Gotze, e.a, 2009].



Alexeev N.L., Glebovitsky V.A., Zinger T.F., Kapitonov I.N. U-Pb age of igneous and metamorphic events on the Fisher massif (east Antarctica) and its significance for geodynamic reconstruction // Doklady Earth Sciences, 2010, v.435, N 1, p.1435-1441..

Lokhov K.I., Saltykova T.E., Kapitonov I.N., e.a. Correct interpretation of isotopic U-Pb zircon age by isotopic geochemistry of hafnium and neodymium (on example of some magmatic complexes of the basement of the East – European platform). // Regional Geology and Metallogeny 2009. № 38. С. 43-53. (in Russian).

Chumakov, N. · Kapitonov, I. · Semikhatov, M. · Leonov, M. · Rud'ko, S. Vendian age of the upper part of the patom complex in Middle Siberia: U/Pb LA-ICPMS dates of detrital zircons from the Nikol'skoe and Zherba formations

Journal Stratigraphy and Geological Correlation V 19, N 2, march-april 2011, p. 115-119

I. Kapitonov, E. Prilepsky, K. Lokhov, S. Sergeev. Experience of the high-speed monitoring of 13C/12C isotope ratio in schungite by LA-ICPMS technique. 33rd IGC, Oslo, 2008,  http://www.cprm.gov.br/33IGC/1336007.html

J. Gotze, R. Mockel, U. Kempe, I. Kapitonov, and T. Vennemann. Characteristics and origin of agates in sedimentary rocks from the Dryhead area, Montana, USA, Mineralogical Magazine, 2009; 73(4): 673 - 690.

N.V. Rodionov, B.V. Belyatsky, A.V. Antonov, I.N. Kapitonov, S.A. Sergeev. Comparative in-situ U–Th–Pb geochronology and trace element composition of baddeleyite and low-U zircon from carbonatites of the Palaeozoic Kovdor alkaline–ultramafic complex, Kola Peninsula, Russia, Gondwana Research,Volume 21, Issue 4, 2012, p. 728–744.