Iron isotope fractionation during silicate-carbonatite liquid
immiscibility processes

J 2025

Iron isotope fractionation during silicate-carbonatite liquid immiscibility processes

ZHANG, Xiao-Bao; Jian-Qiang LIU; Lukas KRMICEK; Valentin R TROLL; Tomas MAGNA et. al.

Základní údaje

Originální název

Iron isotope fractionation during silicate-carbonatite liquid immiscibility processes

Autoři

ZHANG, Xiao-Bao; Jian-Qiang LIU; Lukas KRMICEK; Valentin R TROLL; Tomas MAGNA; Adam MAŤO; Gang ZENG; Xiao-Jun WANG a Li-Hui CHEN

Vydání

Chemical Geology, AMSTERDAM, Elsevier, 2025, 0009-2541

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10505 Geology

Stát vydavatele

Nizozemské království

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 3.600 v roce 2024

Organizační jednotka

Přírodovědecká fakulta

DOI

https://doi.org/10.1016/j.chemgeo.2025.122732

UT WoS

001451126300001

EID Scopus

2-s2.0-105000128488

Klíčová slova anglicky

Carbonatites; Ultramafic lamprophyres; Liquid immiscibility; Fe isotope fractionation

Štítky

14315010, rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 29. 8. 2025 11:32, Mgr. Marie Novosadová Šípková, DiS.

Anotace

V originále

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 Sr–Nd 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 Sr–Nd 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.

Citovat

ZHANG, Xiao-Bao; Jian-Qiang LIU; Lukas KRMICEK; Valentin R TROLL; Tomas MAGNA; Adam MAŤO; Gang ZENG; Xiao-Jun WANG a Li-Hui CHEN. Iron isotope fractionation during silicate-carbonatite liquid immiscibility processes. Chemical Geology. AMSTERDAM: Elsevier, 2025, roč. 681, May, s. 1-13. ISSN 0009-2541. Dostupné z: https://doi.org/10.1016/j.chemgeo.2025.122732.

@article{2514263,
   author = {Zhang, XiaoandBao and Liu, JianandQiang and Krmicek, Lukas and Troll, Valentin R and Magna, Tomas and Maťo, Adam and Zeng, Gang and Wang, XiaoandJun and Chen, LiandHui},
   article_location = {AMSTERDAM},
   article_number = {May},
   doi = {https://doi.org/10.1016/j.chemgeo.2025.122732},
   keywords = {Carbonatites; Ultramafic lamprophyres; Liquid immiscibility; Fe isotope fractionation},
   language = {eng},
   issn = {0009-2541},
   journal = {Chemical Geology},
   title = {Iron isotope fractionation during silicate-carbonatite liquid immiscibility processes},
   url = {https://www.sciencedirect.com/science/article/pii/S0009254125001226},
   volume = {681},
   year = {2025}
}

TY  - JOUR
ID  - 2514263
AU  - Zhang, Xiao-Bao - Liu, Jian-Qiang - Krmicek, Lukas - Troll, Valentin R - Magna, Tomas - Maťo, Adam - Zeng, Gang - Wang, Xiao-Jun - Chen, Li-Hui
PY  - 2025
TI  - Iron isotope fractionation during silicate-carbonatite liquid immiscibility processes
JF  - Chemical Geology
VL  - 681
IS  - May
SP  - 1-13
EP  - 1-13
PB  - Elsevier
SN  - 00092541
KW  - Carbonatites
KW  - Ultramafic lamprophyres
KW  - Liquid immiscibility
KW  - Fe isotope fractionation
UR  - https://www.sciencedirect.com/science/article/pii/S0009254125001226
N2  - 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 Sr–Nd 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 Sr–Nd 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.
ER  -

ZHANG, Xiao-Bao; Jian-Qiang LIU; Lukas KRMICEK; Valentin R TROLL; Tomas MAGNA; Adam MAŤO; Gang ZENG; Xiao-Jun WANG a Li-Hui CHEN. Iron isotope fractionation during silicate-carbonatite liquid immiscibility processes. \textit{Chemical Geology}. AMSTERDAM: Elsevier, 2025, roč.~681, May, s.~1-13. ISSN~0009-2541. Dostupné z: https://doi.org/10.1016/j.chemgeo.2025.122732.

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