caa a22 4500 38640254X CHVBK 20180307112205.0 cr unu---uuuuu 161130e198905 xx s 000 0 eng 10.1017/S0016756800022391 doi S0016756800022391 pii (NATIONALLICENCE)cambridge-10.1017/S0016756800022391 Proterozoic Mn-oxide precipitation by planktonic plant protists (acritarchs) [Elektronische Daten] Microfossils of plant protists called acritarchs occur embedded in, mostly, authigenic chlorite cement in sandstones of the Visingsö Group (Upper Proterozoic; southern Sweden). These microfossils are commonly encrusted by a Mn-oxide layer. Similar Mn-oxide was not observed elsewhere in the sandstones, thus suggesting that certain acritarchs have played a role in the transfer and precipitation of Mn in ancient sedimentary environments. In the light of available information on the role of extant protists in biomineralization, possible mechanisms for the precipitation of Mnoxide in the Visingsö Group are discussed. Copyright © Cambridge University Press 1989 Morad S. Department of Mineralogy and Petrology, Institute of Geology, Uppsala University, Box 555, S-751 22 Uppsala, Sweden Vidal G. Geology Department, Micropalaeontology Laboratory, Kemicentrum, University of Lund, Box 124, S-221 00 Lund, Sweden Geological Magazine Cambridge University Press 126/3(1989-05), 301-305 0016-7568 126:3<301 1989 126 GEO https://doi.org/10.1017/S0016756800022391 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0016756800022391 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Morad S. Department of Mineralogy and Petrology, Institute of Geology, Uppsala University, Box 555, S-751 22 Uppsala, Sweden NATIONALLICENCE 700 1- Vidal G. Geology Department, Micropalaeontology Laboratory, Kemicentrum, University of Lund, Box 124, S-221 00 Lund, Sweden NATIONALLICENCE 773 0- Geological Magazine Cambridge University Press 126/3(1989-05), 301-305 0016-7568 126:3<301 1989 126 GEO CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge