Palaeoecology of Mesoproterozoic organic-walled microfossil assemblages from the Mbuji-Mayi Supergroup, DRC
| dc.contributor.author | Kabamba Baludikay, B. | |
| dc.contributor.author | François, C. | |
| dc.contributor.author | Asael, D. | |
| dc.contributor.author | Guilbaud, R. | |
| dc.contributor.author | Poulton, S. | |
| dc.contributor.author | Rouxel, O. | |
| dc.contributor.author | Baudet, D. | |
| dc.contributor.author | Debaille, V. | |
| dc.contributor.author | Mattielli, N. | |
| dc.contributor.author | Javaux, E. | |
| dc.date | 2019 | |
| dc.date.accessioned | 2024-03-14T13:20:56Z | |
| dc.date.available | 2024-03-14T13:20:56Z | |
| dc.identifier.uri | https://orfeo.belnet.be/handle/internal/12373 | |
| dc.description | It is often thought that dominantly anoxic deeper water oceanic conditions throughout the Mesoproterozoic era (1600 1000 Ma) would have limited early eukaryote diversification because eukaryotes lived only in oxygenated habitats. However, recent studies have suggested that some early eukaryotes may have inhabited in dysoxic and anoxic environments, and were thus adapted to low oxygen habitats. To understand the role of oxygen availability in eukaryotic diversification, detailed studies combining micropaleontology and redox proxies at high-resolution are crucial. Here, we combine analyses of the environmental distribution of microfossil assemblages with geochemical analyses of the host shale from the ~1065 to ~1000 Ma Mbuji-Mayi Supergroup, Democratic Republic of the Congo. Our aim is to determine the palaeoecology of early eukaryotes from this region, and to examine links between oceanic redox chemistry and the evolution of the eukaryotic biosphere. Iron speciation, major and trace metal concentrations (Mn, Mo and U) as well as iron and molybdenum isotopes are used. Eukaryotic taxa from Mbuji-Mayi Supergroup microfossil assemblages reveal ecological preference to and/or better preservation in anoxic and ferruginous marginal and shallow-water environments. Within the 11 species eukaryotic taxa observed in shales of the Mbuji-Mayi Supergroup, only 3 eukaryotic species (Lophosphaeridium granulatum, Pterospermopsimorpha insolita and P. pileiformis) are preserved in both oxic and anoxic sediments. Other eukaryotes (Jacutianema solubila, cf. Tappania plana, Trachyhystrichosphaera aimika, T. botula, Valeria elongata, V. lophostriata and an unnamed acanthomorph) occur only in anoxic and ferruginous shallow-subtidal sediments, reflecting favourable preservation conditions and/or favoured habitats. | |
| dc.language | eng | |
| dc.title | Palaeoecology of Mesoproterozoic organic-walled microfossil assemblages from the Mbuji-Mayi Supergroup, DRC | |
| dc.type | Article | |
| dc.subject.frascati | Earth and related Environmental sciences | |
| dc.audience | Scientific | |
| dc.subject.free | Geodynamics and mineral resources | |
| dc.source.title | Precambrian Research | |
| dc.source.volume | in press | |
| Orfeo.peerreviewed | Yes | |
| dc.identifier.rmca | 5654 |
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