Abstract
KARHU, JUHA & O'BRIEN, HUGH 1992: Microfossil-like tourmaline microlites in early Proterozoic nodular chert at Kiihtelysvaara, eastern Finland. Bull. Geol. Soc. Finland 64 Part 1, 113—118. Many Proterozoic silicified sedimentary carbonates have been reported to contain remains of early micro-organisms. One of these localities in the Fennoscandian Shield is the village of Hyypia at Kiihtelysvaara in eastern Finland, where a nodular chert contains microfossil-like objects, named Hyypiana jatulica n. gen., species R. Tynni. The original thin sections and grain mounts from Kiihtelysvaara were reinvestigated petrographically, and similar objects in a new grain mount from the original drill core specimen were analysed using microprobe. Petrographical and geochemical results prove that the microfossil-like objects in these samples from the nodular chert at Kiihtelysvaara are mineralogic pseudomicrofossils consisting of tourmaline microlites. Their chemical composition is similar to dravitic tourmalines from a cherty dolomite formation located in Kuusamo, eastern Finland.
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