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

Kód výsledku v 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>

Nalezeny alternativní kódy

RIV/67985831:_____/19:00504100 RIV/60460709:41330/19:79166

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_ost - Ostatní články v recenzovaných periodicích

CEP obor

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OECD FORD obor

10505 - Geology

Projekt

<a href="/cs/project/GA17-15700S" target="_blank" >GA17-15700S: Formace černých břidlic jako geochemický indikátor paleoenvironmentálních změn a tektonických podmínek podél aktivních kontinentálních okrajů</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Scientific Reports

ISSN

2045-2322

e-ISSN

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Svazek periodika

9

Číslo periodika v rámci svazku

neuvedeno

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

7

Strana od-do

nestránkováno

Kód UT WoS článku

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EID výsledku v databázi Scopus

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