Molybdenum-isotope signals and cerium anomalies in Palaeoproterozoic manganese ore survive high-grade metamorphism

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F19%3A00000055" target="_blank" >RIV/00025798:_____/19:00000055 - isvavai.cz</a>
Alternative codes found
RIV/67985831:_____/19:00504100 RIV/60460709:41330/19:79166
Result on the web
<a href="https://www.nature.com/articles/s41598-019-40998-5" target="_blank" >https://www.nature.com/articles/s41598-019-40998-5</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1038/s41598-019-40998-5" target="_blank" >10.1038/s41598-019-40998-5</a>

Result language
angličtina
Original language name
Molybdenum-isotope signals and cerium anomalies in Palaeoproterozoic manganese ore survive high-grade metamorphism
Original language description
Molybdenum (Mo) and its isotopes have been used to retrieve palaeoenvironmental information on the ocean–atmosphere system through geological time. Their application has so far been restricted to rocks least affected by severe metamorphism and deformation, which may erase oralter palaeoenvironmental signals. Environmental Mo-isotope signatures can be retrieved if the more manganese (Mn)-enriched rocks are isotopically depleted and the maximum range of delta98Mo values is close to the ~2.7per mille Mo-isotope fractionation known from Mo sorption onto Mn oxides at low temperature. Here, we show that the Morro da Mina Mn-ore deposit in Minas Gerais, Brazil,contains Mn-silicate–carbonate ore and associated graphitic schist that likely preserve delta98Mo of Palaeoproterozoic seawater, despite a metamorphic overprint of at least 600 °C. The extent of Moisotope fractionation between the Mn-silicate–carbonate ore and the graphitic schist is similar to modern Mn-oxide precipitates and seawater. Differences in delta98Mo signals are broadly reflected in cerium (Ce) anomalies, which suggest an oxic–anoxic-stratified Palaeoproterozoic ocean.
Czech name
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Czech description
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Project
<a href="/en/project/GA17-15700S" target="_blank" >GA17-15700S: Black shale formations as geochemical markers of paleoenvironmental changes and tectonic setting along active continental margins</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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