Abstract
Three main types of iron sulfide occurrences are known in sedimentary rocks in Romania. They include: (1) framboidal pyrite in black shales typically associated with anatase or rutile and carbonaceous matter; similar in size and in association with carbonates are the globular pyrites observed in some low-T vein ores; (2) pyrite concretions’and macrocrystals in sandstones, marls, and limestones of different age; these pyrites exhibit typical relationships of the minor elements such as Co, Ni, and Mn, which represent — in a diagrammatic form — a supplementary tool in separating the sedimentary pyrites; (3) pyrrhotite concretions in an anthracite-bearing sequence of Liassic age; the pyrrhotite is here associated with sphalerite, chalcopyrite, pyrite, and rutile. Some sulphur isotope data on sedimentary pyrite (type 2) are also given, which show a very great spread of the 6 34S values.
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