Holtstam, D.
W and V mineralization in Långban-type Fe-Mn deposits: Epigenetic or syngenetic?

Keywords
Tungsten, vanadium, scheelite, welinite, chondrostibian, manganberzeliite, Långban-type deposit, exhalative ores, syngenetic mineralization, Bergslagen, Sweden

Abstract
New observations of minerals rich in W and V at the carbonate-hosted Långban-type Fe-Mn-(Ba-As-Pb-Sb) deposits in the Bergslagen region, Sweden, have been made. Scheelite with variable but high Mo contents (up to 40 mol.% powellite) commonly occurs in the hematite-quartz ores. Crystals of welinite, found in vein assemblages (Långban, Sjögruvan) and in Mn skarn matrices (Sjögruvan), are often complexly zoned and display some solid solution towards the Sb-Fe counterpart örebroite. Manganberzeliite containing up to 20 mol.% of its vanadate analogue (palenzonaite) in solid solution has been recorded from the Jakobsberg deposit. In contrast to previous assumptions, there appears to be no genetic link between local granitic rocks and the W minerals. W, as well as V, is inferred to be syngenetic with Fe and Mn at these deposits.

Author info
D. Holtstam, Dept. of Mineralogy, Swedish Museum of Natural History, Box 50007, SE-104 05 Stockholm, Sweden, dan.holtstam@nrm.se.

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