Sulfide Mineralization Hosted by Spurrite-Mervinite Marbles (Kochumdek River, East Siberia)

Marbles of the Kochumdek complex contain pyrrhotite, rasvumite, alabandine, würtzite, galena, and acanthite. The diversity of sulfides is caused by efficient crystal chemical fractionation of trace elements under metamorphism of spurrite–merwinite facies. The isotopic–geochemical features of sulfides reveal their formation at the expense of trace elements and sulfur budget of the sedimentary parent rocks.