NDLI: Metasomatic replacements and isotope relationships in zircon crystals and crystallogenetic models

Content Provider	Springer Nature Link
Author	Kaulina, T. V. Sinai, M. Yu. Savchenko, E. E.
Copyright Year	2011
Abstract	Secondary textures formed in natural zircon crystals under the influence of hydrothermal solutions are interpreted as products of metasomatic substitution. Such textures are clearly seen in metamict zircons and zircons enriched in radioactive elements, which are often found in potassic granites, pegmatites, and other rocks with high U and Th contents. Specific secondary textures in zircons contained in microcline granites, metasedimentary and eclogite-like rocks of the Kola Peninsula are reviewed. Detailed mineralogical and geochemical studies of zircons (CL, BSE, microprobe analysis of incompatible elements) have been carried out with the subsequent U-Pb dating of different zircon zones. The mechanism of secondary texture formation is considered in terms of metasomatic isomorphic substitution. Analogy between natural structure of zircon and products of experimental isomorphic substitution makes it possible to obtain additional information on conditions of the natural zircon growth important for interpreting geochronological data. When metamict zircons are substituted without gaining new material and with a decrease in volume, the U-Pb age of initial zircon remains unchanged and the lower intercept of discordia and concordia corresponds to the time of fluid impact. Substitution with a gain in matter is accompanied by excess volume. In this case, the timing of zones of transitional composition is devoid of geological sense.
Starting Page	735
Ending Page	744
Page Count	10
File Format	PDF
ISSN	10757015
Journal	Geology of Ore Deposits
Volume Number	53
Issue Number	8
e-ISSN	15556476
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2012-01-05
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mineral Resources
Content Type	Text
Resource Type	Article
Subject	Geology Economic Geology Geochemistry and Petrology

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