Carbonatites of Tarim (NW China): First evidence of crustal contribution in carbonatites from a large igneous province

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62156489%3A43410%2F17%3A43913031" target="_blank" >RIV/62156489:43410/17:43913031 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216305:26620/17:PU125629

Výsledek na webu

<a href="https://doi.org/10.1016/j.lithos.2017.02.018" target="_blank" >https://doi.org/10.1016/j.lithos.2017.02.018</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.lithos.2017.02.018" target="_blank" >10.1016/j.lithos.2017.02.018</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Carbonatites of Tarim (NW China): First evidence of crustal contribution in carbonatites from a large igneous province

Popis výsledku v původním jazyce

Many carbonatites are associated both spatially and temporally with large igneous provinces (LIPs), and considered to originate from a mantle plume source lacking any contribution from recycled crustal materials. Here, we report an occurrence of carbonatite enriched in rare-earth elements (REE) and associated with the Tarim LIP in northwestern China The Tarim LIP comprises intrusive and volcanic products of mantle plume activity spanning from similar to 300 to 280 Ma. The carbonatites at Wajilitage in the northwestern part of Tarim are dominated by calcite and dolomite varieties, and contain abundant REE minerals (principally, monazite and REE-fluorcarbonates). Th-Pb age determination of monazite yielded an emplacement age of 266 +/- 5.3 Ma, i.e. appreciably younger than the eruption age of flood basalts at similar to 290 Ma. The carbonatites show low initial Sr-87/Sr-86 (0.7037-0.7041) and high epsilon(Nd(t)) (1.2-4)values, which depart from the isotopic characteristics of plume-derived basalts and high-Mg picrites from the same area. This indicates that the Wajilitage carbonatites derived from a mantle source isotopically distinct from the one responsible for the voluminous (ultra)mafic volcanism at Tarim. The carbonatites show delta Mg-26(DSM3) values (-0.99 to -0.65%.) that are significantly lower than those in typical mantle-derived rocks and rift carbonatites, but close to marine sediments and orogenic carbonatites. We propose that the carbonatites in the Tarim LIP formed by decompressional melting of recycled sediments mixed with the ambient mantle peridotite. The enriched components in the Tarim plume could be accounted for by the presence of recycled sedimentary components in the subcontinental mantle.

Název v anglickém jazyce

Carbonatites of Tarim (NW China): First evidence of crustal contribution in carbonatites from a large igneous province

Popis výsledku anglicky

Many carbonatites are associated both spatially and temporally with large igneous provinces (LIPs), and considered to originate from a mantle plume source lacking any contribution from recycled crustal materials. Here, we report an occurrence of carbonatite enriched in rare-earth elements (REE) and associated with the Tarim LIP in northwestern China The Tarim LIP comprises intrusive and volcanic products of mantle plume activity spanning from similar to 300 to 280 Ma. The carbonatites at Wajilitage in the northwestern part of Tarim are dominated by calcite and dolomite varieties, and contain abundant REE minerals (principally, monazite and REE-fluorcarbonates). Th-Pb age determination of monazite yielded an emplacement age of 266 +/- 5.3 Ma, i.e. appreciably younger than the eruption age of flood basalts at similar to 290 Ma. The carbonatites show low initial Sr-87/Sr-86 (0.7037-0.7041) and high epsilon(Nd(t)) (1.2-4)values, which depart from the isotopic characteristics of plume-derived basalts and high-Mg picrites from the same area. This indicates that the Wajilitage carbonatites derived from a mantle source isotopically distinct from the one responsible for the voluminous (ultra)mafic volcanism at Tarim. The carbonatites show delta Mg-26(DSM3) values (-0.99 to -0.65%.) that are significantly lower than those in typical mantle-derived rocks and rift carbonatites, but close to marine sediments and orogenic carbonatites. We propose that the carbonatites in the Tarim LIP formed by decompressional melting of recycled sediments mixed with the ambient mantle peridotite. The enriched components in the Tarim plume could be accounted for by the presence of recycled sedimentary components in the subcontinental mantle.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10504 - Mineralogy

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

Lithos

ISSN

0024-4937

e-ISSN

—

Svazek periodika

282-283

Číslo periodika v rámci svazku

June

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

9

Strana od-do

1-9

Kód UT WoS článku

000401388100001

EID výsledku v databázi Scopus

2-s2.0-85015094946