U-Th-He system in ore and accessory minerals from metasomatic rocks: testing potential thermochronometers from the Salla-Kuolayarvi zone

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Resumo

A new approach to obtaining U-Th-He thermochronologic information is proposed. The content and mobility of radiogenic helium in concentrates of pyrite, magnetite, hematite and amphibole from albitites and their host rocks from gold-bearing uranium ore occurrences in the Salla-Kuolayarvi belt (northern Karelia) were estimated based on the results of incremental heating of samples with simultaneous registration of helium flux. The values of apparent U-Th-He ages were calculated taking into account the contribution of the trapped component. Suitability of the mineral species for placing the age boundaries on the evolution of ore-bearing metasomatic rocks was considered on the basis of the calculated parameters of helium mobility in the lattice, as well as petrographic features of each individual sample.

Sobre autores

M. Gannibal

Geological Institute of the Kola Scientific Center, Russian Academy of Sciences

Email: m.a.gannibal@gmail.com
Apatity, Russia

A. Gannibal

Geological Institute of the Kola Scientific Center, Russian Academy of Sciences

Email: m.a.gannibal@gmail.com
Apatity, Russia

A. Gudkov

Geological Institute of the Kola Scientific Center, Russian Academy of Sciences

Email: m.a.gannibal@gmail.com
Apatity, Russia

A. Kalinin

Geological Institute of the Kola Scientific Center, Russian Academy of Sciences

Email: m.a.gannibal@gmail.com
Apatity, Russia

M. Kashuk

Geological Institute of the Kola Scientific Center, Russian Academy of Sciences

Email: m.a.gannibal@gmail.com
Apatity, Russia

V. Kolobov

Center for Physical and Technical Problems of Northern Energy, Kola Scientific Center, Russian Academy of Sciences

Autor responsável pela correspondência
Email: m.a.gannibal@gmail.com
Apatity, Russia

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