Carbonate-rich dyke in Roztoky Intrusive Complex – an evidence for carbonatite magmatism in the Eger Rift?

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F17%3A00000085" target="_blank" >RIV/00025798:_____/17:00000085 - isvavai.cz</a>

Výsledek na webu

<a href="http://www.jgeosci.org/content/jgeosci.238_rapprich.pdf" target="_blank" >http://www.jgeosci.org/content/jgeosci.238_rapprich.pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3190/jgeosci.238" target="_blank" >10.3190/jgeosci.238</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Carbonate-rich dyke in Roztoky Intrusive Complex – an evidence for carbonatite magmatism in the Eger Rift?

Popis výsledku v původním jazyce

The possible presence of carbonatites in the Eger Rift (NW Bohemian Massif, Czech Republic) has been debated for several decades without any apparent resolution. Here, we document an almost 2 m thick dyke of a silicocarbonatite (23 wt. % SiO2, 27 wt. % CO2) in the R2 (Roztoky nad Labem) drilling at the depth of 152.9–154.8 m. Despite the fact that the silicocarbonatite is associated with alkaline intrusive complex, its content of alkalis is rather low (Na2O + K2O = 2.5 wt. %), as are REE (ΣREE = 82.6 ppm). The stable isotope signature (δ18O = 7.43 ‰, δ13C = −2.46 ‰) of this rock is distinct from surrounding sedimentary rocks, while it can be compared with C–O isotope systematics of some carbonatites in the world which probably sourced carbonates from older subduction events. The Sr–Nd isotope composition (87Sr/86Sr30 ~ 0.7062; 143Nd/144Nd30 ~ 0.51205) points to an enriched reservoir without known counterparts among alkaline rocks from the Eger Rift, perhaps a lithospheric mantle modified in course of the Variscan subduction. The position of the R2 silicocarbonatite in the Sr–Nd space may indicate a continuum of enriched radiogenic isotope systematics in worldwide carbonatite occurrences.

Název v anglickém jazyce

Carbonate-rich dyke in Roztoky Intrusive Complex – an evidence for carbonatite magmatism in the Eger Rift?

Popis výsledku anglicky

The possible presence of carbonatites in the Eger Rift (NW Bohemian Massif, Czech Republic) has been debated for several decades without any apparent resolution. Here, we document an almost 2 m thick dyke of a silicocarbonatite (23 wt. % SiO2, 27 wt. % CO2) in the R2 (Roztoky nad Labem) drilling at the depth of 152.9–154.8 m. Despite the fact that the silicocarbonatite is associated with alkaline intrusive complex, its content of alkalis is rather low (Na2O + K2O = 2.5 wt. %), as are REE (ΣREE = 82.6 ppm). The stable isotope signature (δ18O = 7.43 ‰, δ13C = −2.46 ‰) of this rock is distinct from surrounding sedimentary rocks, while it can be compared with C–O isotope systematics of some carbonatites in the world which probably sourced carbonates from older subduction events. The Sr–Nd isotope composition (87Sr/86Sr30 ~ 0.7062; 143Nd/144Nd30 ~ 0.51205) points to an enriched reservoir without known counterparts among alkaline rocks from the Eger Rift, perhaps a lithospheric mantle modified in course of the Variscan subduction. The position of the R2 silicocarbonatite in the Sr–Nd space may indicate a continuum of enriched radiogenic isotope systematics in worldwide carbonatite occurrences.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

<a href="/cs/project/GA15-08583S" target="_blank" >GA15-08583S: Role karbonatitů pro bilanci HFSE a HSE prvků v zemském plášti - kombinovaný přístup pomocí stabilních a radiogenních izotopů</a><br>

Návaznosti

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

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

Journal of Geosciences

ISSN

1802-6222

e-ISSN

—

Svazek periodika

62

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

16

Strana od-do

121-136

Kód UT WoS článku

000403154700006

EID výsledku v databázi Scopus

2-s2.0-85018373856