Rare earth element enrichment in Palaeoproterozoic Fengzhen carbonatite from the North China block

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62156489%3A43410%2F16%3A43909683" target="_blank" >RIV/62156489:43410/16:43909683 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1080/00206814.2016.1193774" target="_blank" >http://dx.doi.org/10.1080/00206814.2016.1193774</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1080/00206814.2016.1193774" target="_blank" >10.1080/00206814.2016.1193774</a>

Result language

angličtina

Original language name

Rare earth element enrichment in Palaeoproterozoic Fengzhen carbonatite from the North China block

Original language description

Carbonatites are characterized by the highest concentration of rare earth elements (REEs) of any igneous rock and are therefore good targets for REE exploration. Supergene, hydrothermal, and magmatic REE deposits associated with carbonatites have been widely studied. REE enrichment related to fluorapatite metasomatism in Fengzhen carbonatites in the North China block is reported in this study. REE minerals (monazite, britholite, and Ca-REE-fluorocarbonates) associated with barite and quartz formed as inclusions within the fluorapatite and externally on its surface. Monazite, allanite, barite, and quartz occur as rim grains on the edges of the fluorapatite. Zoned fluorapatite was observed and showed varying chemical composition. Based on back-scattered electron imaging, the dark domains with mineral inclusions contain lower Si (0.3-0.6wt.% SiO2) and light REE (LREE) [0.36-1.54wt.% (Y+LREE)(2)O-3] contents than inclusion-poor areas [0.7-1wt.% SiO2; 2.16-4.51wt.% (Y + LREE)(2)O-3]. This indicates a dissolution-re-precipitation texture. Different types of monazites were distinguished by their chemical compositions. Monazite inclusions have lower La(2)O(3)contents (similar to 13wt.%) and La/Nd-cn (similar to 3) ratios than those (18-26wt.% and 10-14 for La2O3 and La/Nd-cn, respectively) growing externally on the fluorapatite. REE enrichment in the metasomatic fluorapatites is related to different stages of carbonatitic liquids. The early carbonatite-exsolved fluids metasomatized the fluorapatites to form REE mineral inclusions. The late carbonatitic fluids from carbonatite magmas that underwent strong fractional crystallization were enriched in REEs, Al, and Fe and metasomatized the fluorapatites to produce allanite and monazite rim grains.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

DB - Geology and mineralogy

OECD FORD branch

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Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2016

Confidentiality

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

Name of the periodical

International Geology Review

ISSN

0020-6814

e-ISSN

—

Volume of the periodical

58

Issue of the periodical within the volume

15

Country of publishing house

US - UNITED STATES

Number of pages

11

Pages from-to

1940-1950

UT code for WoS article

000381013500006

EID of the result in the Scopus database

2-s2.0-84976417328