Počet záznamů: 1
Molybdenum-isotope signals and cerium anomalies in Palaeoproterozoic manganese ore survive high-grade metamorphism
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SYSNO ASEP 0504100 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Molybdenum-isotope signals and cerium anomalies in Palaeoproterozoic manganese ore survive high-grade metamorphism Tvůrce(i) Cabral, A. R. (BR)
Zeh, A. (DE)
Vianna, N. C. (BR)
Ackerman, Lukáš (GLU-S) RID, SAI, ORCID
Pašava, J. (CZ)
Lehmann, B. (DE)
Chrastný, V. (CZ)Číslo článku 4570 Zdroj.dok. Scientific Reports. - : Nature Publishing Group - ISSN 2045-2322
Roč. 9, č. 1 (2019)Poč.str. 7 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova molybdenum ; Cambrian ; Mo isotope Vědní obor RIV DB - Geologie a mineralogie Obor OECD Geology CEP GA17-15700S GA ČR - Grantová agentura ČR Způsob publikování Open access Institucionální podpora GLU-S - RVO:67985831 UT WOS 000461159600047 EID SCOPUS 85062988159 DOI 10.1038/s41598-019-40998-5 Anotace 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 or alter palaeoenvironmental signals. Environmental Mo-isotope signatures can be retrieved if the more manganese (Mn)-enriched rocks are isotopically depleted and the maximum range of δ98Mo values is close to the ~2.7‰ 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 δ98Mo 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 δ98Mo signals are broadly reflected in cerium (Ce) anomalies, which suggest an oxic–anoxic-stratified Palaeoproterozoic ocean. Pracoviště Geologický ústav Kontakt Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272 Rok sběru 2020 Elektronická adresa https://www.nature.com/articles/s41598-019-40998-5
Počet záznamů: 1