Coupled sulfur, iron and molybdenum isotope data from black shales of the Teplá-Barrandian unit argue against deep ocean oxygenation during the Ediacaran

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F15%3A00000168" target="_blank" >RIV/00025798:_____/15:00000168 - isvavai.cz</a>

Výsledek na webu

<a href="http://www.sciencedirect.com/science/journal/00167037/171" target="_blank" >http://www.sciencedirect.com/science/journal/00167037/171</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.gca.2015.08.022" target="_blank" >10.1016/j.gca.2015.08.022</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Coupled sulfur, iron and molybdenum isotope data from black shales of the Teplá-Barrandian unit argue against deep ocean oxygenation during the Ediacaran

Popis výsledku v původním jazyce

Here we present the major and trace element composition as well as Mo, S and Fe isotopic data of organic-rich black shales from the Teplá-Barrandian unit, Czech Republic . New in situ zircon U-Pb age constraints provide a maximum depositional age of 559.8 ? 3.8 million years. Black shales with strongest metal enrichment show low ?56Fe values due to the excess of authigenic pyrite-Fe with ?56Fe values around -0.6 ? over detrital Fe with ?56Fe values around 0.1 ?. Periods of reduced authigenic metal enrichment show relatively lower Mo/TOC ratios and increasing ?34S values, which could reflect basinal restriction and longer seawater renewal times. Similar to the modern Black Sea, the accompanied depletion of basinal Moaq due to near quantitative Mo removal might have enabled the preservation of the seawater ?98Mo in respective black shales. Our best estimate for this seawater Mo isotopic composition ;560 million years ago is +1.2 ? in ?98Mo, which is nearly identical to inferred seawater

Název v anglickém jazyce

Coupled sulfur, iron and molybdenum isotope data from black shales of the Teplá-Barrandian unit argue against deep ocean oxygenation during the Ediacaran

Popis výsledku anglicky

Here we present the major and trace element composition as well as Mo, S and Fe isotopic data of organic-rich black shales from the Teplá-Barrandian unit, Czech Republic . New in situ zircon U-Pb age constraints provide a maximum depositional age of 559.8 ? 3.8 million years. Black shales with strongest metal enrichment show low ?56Fe values due to the excess of authigenic pyrite-Fe with ?56Fe values around -0.6 ? over detrital Fe with ?56Fe values around 0.1 ?. Periods of reduced authigenic metal enrichment show relatively lower Mo/TOC ratios and increasing ?34S values, which could reflect basinal restriction and longer seawater renewal times. Similar to the modern Black Sea, the accompanied depletion of basinal Moaq due to near quantitative Mo removal might have enabled the preservation of the seawater ?98Mo in respective black shales. Our best estimate for this seawater Mo isotopic composition ;560 million years ago is +1.2 ? in ?98Mo, which is nearly identical to inferred seawater

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

DD - Geochemie

OECD FORD obor

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Projekt

<a href="/cs/project/GA13-15390S" target="_blank" >GA13-15390S: Re-Os geochronologie rudních mineralizací Českého masivu a důsledky pro jejich metalogenezi</a><br>

Návaznosti

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

Rok uplatnění

2015

Kód důvěrnosti údajů

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

Název periodika

Geochimica et Cosmochimica Acta

ISSN

0016-7037

e-ISSN

—

Svazek periodika

171

Číslo periodika v rámci svazku

15 December 2015

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

21

Strana od-do

121-142

Kód UT WoS článku

000364822100008

EID výsledku v databázi Scopus

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