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Research of radiation-stimulated processes in zircon in connection with the solution of geochronology problems and the search of rare-earth elements

ABSTRACT

 

Report on the SRW: 74 pages, 31 figures, 16 tables, 68 sources

The objects of research are damage to the structure of zircon, which occurs as a result of autoradiation, and the distribution of rare earth elements in zircon.

The aim of the work is a comprehensive study of radiation-stimulated processes in zircon in connection with solving the problems of geochronology and studying the content and distribution of rare earth elements in zircons.

Mechanisms of radiation damage to zircon were investigated using computer simulation methods. The overlapping of cascades of displaced atoms was investigated. A model of zircon amorphization was developed using the Monte Carlo method. The obtained results show that in the interval fa=0.3-0.7 there is a linear dependence of the degree of crystallinity on the crystallite size. This is due to the percolation transition, in which the amorphous regions already begin to overlap with each other. Using the amorphization model, the degree of amorphization of some zircon samples of Yastrubetsky Zr - REE ore occurrence was calculated based on X-ray analysis data. It was established that the degree of crystallinity changes with depth. The obtained values of the degree of amorphization of zircon are consistent with the calculated radiation dose. This confirms the correctness of the model we developed, and indicates that the amorphization of the zircon structure is mainly related to radiation autoirradiation.

The results of this study can be used in solving problems related to the selection of zircon samples for dating geological objects and searching for rare earth elements.

Authors:

Other authors:

T.V. Ohar

Keywords:

radiation mineralogy, nanomineralogy, computer modeling of the structure, isomorphic zircon

Head of the research:

Hrechanivskyi Oleksii Yevhenovych

Registration Card (RC):

0113U005421

Execution period of the research:

2013 - 2014