The Leppyasuria Mo-V deposit is hosted in black shales of palaeoproterozoic Soanlahty formation metamorphosed in a higher-grade greenschist-facies. Fine high-carbon rocks (up to 60 wt. % organic carbon) have been studied by optical microscopy, scanning electron microscopy and Raman spectroscopy. As a result different carbon nodules and halos (zones) surrounding the uranium-bearing minerals have been found. Halos consist of amorphous carbon due to irradiation of carbonaceous material Carbonaceous matter of flakes and nodules is defined as graphite with low content of triperiodic structure..
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