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Abstract <p>A new approach to obtaining (U–Th)/He thermochronological 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 the helium flux. The values of the apparent U–Th–He ages were calculated taking into account the contribution of the trapped component. The 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 the petrographic features of each individual sample.</p>

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The U–Th–He System in Ore and Accessory Minerals from Metasomatic Rocks: Testing Potential Thermochronometers from the Salla-Kuolayarvi Zone

  • 期刊论文

  • 发表日期：

    2025年3月1日

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  • M. A. Gannibal,
  • A. E. Gannibal,
  • A. V. Gudkov,
  • A. A. Kalinin,
  • M. O. Kashuk,
  • V. V. Kolobov

摘要

Abstract

A new approach to obtaining (U–Th)/He thermochronological 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 the helium flux. The values of the apparent U–Th–He ages were calculated taking into account the contribution of the trapped component. The 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 the petrographic features of each individual sample.