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    Microprobe dating

    Monazite geochronology is a dating technique to study geological history using the mineral monazite.It is a powerful tool in studying the complex history of metamorphic rocks particularly, as well as igneous, sedimentary and hydrothermal rocks.The SHRIMP is primarily used for geological and geochemical applications.It can measure the isotopic and elemental abundances in minerals at a 30 micrometre-scale and is therefore well-suited for the analysis of complex minerals, as often found in metamorphic terrains, some igneous rocks, and for relatively rapid analysis of statistical valid sets of detrital minerals from sedimentary rocks.Because of the age zonation, dating should be done on individual zones, rather than the whole crystal.Also, textures of monazite crystals may represent certain type of events.The Ar-Ar dating technique was developed by Merrihue and Turner (1966) and proved to be an extremely powerful geochronological tool even before the advent of laser extraction techniques.

    Like other SIMS instruments, the SHRIMP microprobe bombards a sample under vacuum with a beam of primary ions that sputters secondary ions that are focused, filtered, and measured according to their energy and mass.Scrutiny of the composition, heterogeneity, and chemical substitution of U and Th ions is a necessary stage of chemical dating aimed at estimating the degree of closeness of the U-Th-Pb system and unbiased screening of analytical data.The results obtained have been compared with the known isotopic ages of the studied minerals; the compared data are satisfactorily consistent.To develop chemical microprobe timing of U-Th-bearing minerals, monazite grains from several localities in the Ural and Siberia have been dated using upgraded measurement techniques and age calculation based on original software.The samples were taken from pegmatites of the Ilmeny Mountains and the Ilmeny-Vishnevy Mountains Complex in the South Urals; pegmatites from the Adui granitic pluton and its framework in the Central Urals; gneisses and granulites of the Taratash Complex in the South Urals; and felsic gneisses from the Transangara region of the Yenisei Ridge.

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