Abstract

The migration of helium from the crystal lattices of sulfides (pyrite, pyrrhotite, chalcopyrite, bornite, and sphalerite) and sulfosalts (tennantite and tetrahedrite) was studied. It was shown that helium occurs in submicrometer inclusions of uranium- and thorium-bearing minerals. The curves of helium thermal desorption from the sulfide and sulfosalts were obtained by the step-heating method and analyzed on the basis of the single-jump migration model. The interpretation of these data led to the conclusion on the possibility of the U–Th–He dating of pyrite. It was shown that the migration parameters of helium in the other sulfides and sulfosalts are not suitable for their potential use as U–Th–He geochronometer. Based on a comparison of data on helium migration in various minerals, it was suggested that high helium retentivity in some sulfides and arsenides (pyrite and sperrylite) is related to the type of their crystal lattice, packing density, and specific electric resistivity.

中文翻译：

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放射性氦在硫化物晶体结构中的迁移及其同位素定年的前景

摘要

研究了氦从硫化物（黄铁矿，黄铁矿，黄铜矿，褐铁矿和闪锌矿）和亚硫酸盐（球铁矿和四面体）的晶格迁移。结果表明，氦气存在于亚微米级夹杂的铀和th矿物中。通过逐步加热法获得了硫化物和亚硫酸盐中氦的热脱附曲线，并基于单跃迁迁移模型进行了分析。这些数据的解释得出关于黄铁矿U–Th–He年代定年的结论。结果表明，氦气在其他硫化物和亚硫酸盐中的迁移参数不适合作为U–Th–He地球精密计时器的潜在用途。根据各种矿物中氦迁移的数据比较，