Evidence of Mn-oxide biomineralization, Vani Mn deposit, Milos, Greece

Kilias, S.P.; Detsi, K.; Godelitsas, A.; Typas, M.; Naden, J.; Marantos, Y.. 2007 Evidence of Mn-oxide biomineralization, Vani Mn deposit, Milos, Greece. In: Andrew, C.J., (ed.) Digging deeper : proceedings of the ninth biennial Meeting of the Society for Geology Applied to Mineral Deposits, Dublin, Ireland 20th-23rd August 2007. Dublin, Ireland, Irish Association of Economic Geologists, 1069-1072.

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We present evidence that precipitation of primary Mn-oxide minerals in the Vani volcanic hosted hybrid epithermal-VMS-type Mn-oxide and barite deposit was in part biogenically mediated. Manganese-oxides pseudomorphically replace small (1-5 mu m) spherical cell-like structures, and branching filamentous constructions (< 60 mu m long) probably representing manganese oxidizing bacteria. In addition, silicified consortia of spherical (5-10 mu m), filamentous, sheathed, septate and spiral (similar to 50-200 mu m) fossilized bacteria, proposed to represent photosynthetic thermophilic cyanobacteria, were found in quartz paragenetically related to the Mn ore. Fluid inclusions indicate formation temperatures around 100 degrees C. XRD and EMP analyses suggest X-ray-amorphous hollandite-group like Mn-oxide phases, and poorly crystalline todorokite and vernadite. These findings suggest a biological link between bacterial and mineralization processes.

Item Type: Publication - Book Section
Programmes: BGS Programmes > Economic Minerals
Additional Keywords: biogenic Mn-oxides; todorokite; Milos; fossil bacteria
NORA Subject Terms: Earth Sciences
Date made live: 24 Aug 2012 13:55 +0 (UTC)

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