Iron isotope fractionation during silicate‑carbonatite liquid immiscibility processes
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985831%3A_____%2F25%3A00618118" target="_blank" >RIV/67985831:_____/25:00618118 - isvavai.cz</a>
Alternative codes found
RIV/00025798:_____/25:10169520 RIV/00216224:14310/25:00141866 RIV/00216305:26110/26:0199942
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S0009254125001226?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0009254125001226?via%3Dihub</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.chemgeo.2025.122732" target="_blank" >10.1016/j.chemgeo.2025.122732</a>
Alternative languages
Result language
angličtina
Original language name
Iron isotope fractionation during silicate‑carbonatite liquid immiscibility processes
Original language description
Liquid immiscibility is one of the viable genetic models to generate carbonatites. Experimental studies have demonstrated that lighter Fe isotopes are enriched in carbonatite melts, whereas heavier Fe isotopes preferentially enter silicate melts during liquid immiscibility. However, this observation has not been substantiated by natural samples, and the mechanism behind Fe isotope fractionation during silicate–carbonatite immiscibility remains unclear. Here, we present high-precision Fe isotope data, combined with petrography, whole-rock elemental and Srsingle bondNd isotopic compositions, for ultramafic lamprophyres (UML) and carbonatites from the Alnö complex in central Sweden, to elucidate the Fe isotope fractionation during silicate–carbonatite immiscibility processes. The presence of various carbonate spherules in UML, coupled with enrichments in Sr and Ba and depletion in high field strength elements in carbonatites, as well as their overlapping Srsingle bondNd isotope compositions, supports a petrogenetic relationship involving liquid immiscibility between the UML and carbonatites. The mean δ57Fe of UML (0.16 ± 0.08 ‰) is higher than that of carbonatites (0.03 ± 0.04 ‰), with ∆57Fesil−carb of 0.13 ‰ (± 0.05, 2SD). By excluding the effects of low temperature alteration and magmatic processes, we conclude that silicate–carbonatite immiscibility imparts significant Fe isotope fractionation. This fractionation may be influenced by different Fe bond strengths provided by the distinct polymer networks of silicate and carbonatite melts, as well as the varying degrees of Fe enrichment in minerals and melts. This leads to light Fe isotopes being preferentially enriched in the carbonate melt, while heavy Fe isotopes become enriched in the coexisting silicate melt.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10505 - Geology
Result continuities
Project
<a href="/en/project/GX19-29124X" target="_blank" >GX19-29124X: EVOLUTION AND POST-EMPLACEMENT HISTORY OF CARBONATITES: IMPLICATIONS FOR THE MOBILITY AND CONCENTRATION OF CRITICAL METALS</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Chemical Geology
ISSN
0009-2541
e-ISSN
1872-6836
Volume of the periodical
681
Issue of the periodical within the volume
May
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
13
Pages from-to
122732
UT code for WoS article
001451126300001
EID of the result in the Scopus database
2-s2.0-105000128488