Mantle Zn Isotopic Heterogeneity Caused by Melt‐Rock Reaction: Evidence From Fe‐Rich Peridotites and Pyroxenites From the Bohemian Massif, Central Europe
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985831%3A_____%2F19%3A00505049" target="_blank" >RIV/67985831:_____/19:00505049 - isvavai.cz</a>
Result on the web
<a href="https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2018JB017125" target="_blank" >https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2018JB017125</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1029/2018JB017125" target="_blank" >10.1029/2018JB017125</a>
Alternative languages
Result language
angličtina
Original language name
Mantle Zn Isotopic Heterogeneity Caused by Melt‐Rock Reaction: Evidence From Fe‐Rich Peridotites and Pyroxenites From the Bohemian Massif, Central Europe
Original language description
To investigate the effect of melt‐rock reaction on Zn isotope fractionation and mantle Zn isotopic heterogeneity, we analyzed Zn isotopic compositions of peridotites, pyroxenites, and mineral separates from the Bohemian Massif, Central Europe. The Mg‐lherzolites (Mg# = 90.9 to 89.1, FeOT = 7.9 to 9.0 wt %) are melting residues with only moderate metasomatism and have δ66Zn from 0.11 to 0.20‰. In contrast, the Fe‐rich peridotites (Mg# = 88.2 to 80.3, FeOT = 10.0 to 14.5 wt %) and pyroxenites have larger ranges of δ66Zn from 0.11 to 0.31‰ and −0.33 to 0.42‰, respectively. Large disequilibrium intermineral Zn isotope fractionation occurs in the Fe‐rich peridotites and pyroxenites with Δ66ZnOpx‐Ol = −0.50‰, Δ66ZnGrt‐Ol = −0.55 to −0.39‰, Δ66ZnGrt‐Opx = −0.28 to −0.05‰, and Δ66ZnGrt‐Cpx = −0.50 to 0.12‰. Combined with their low SiO2 contents and radiogenic Sr‐Nd‐Os isotopic compositions, the high δ66Zn of the Fe‐rich peridotites is attributed to reaction between Mg‐lherzolites and percolating SiO2‐undersaturated basaltic melts that incorporated isotopically heavy crustal components. Crystallization of the isotopically heavy percolating melts migrating through the lithospheric mantle yield the high‐δ66Zn pyroxenites. The low δ66Zn of the pyroxenites and large intermineral Zn isotopic disequilibrium may result from kinetic Zn isotope fractionation during melt‐rock reaction. Collectively, these observations indicate that melt‐rock reaction can cause intermineral Zn isotopic disequilibrium and significant Zn isotopic heterogeneity in the mantle. This study thus highlights the potential use of Zn isotopes to trace melt‐rock reaction events in the mantle.
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
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OECD FORD branch
10505 - Geology
Result continuities
Project
—
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Geophysical Research: Solid Earth
ISSN
2169-9313
e-ISSN
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Volume of the periodical
124
Issue of the periodical within the volume
4
Country of publishing house
US - UNITED STATES
Number of pages
17
Pages from-to
3588-3604
UT code for WoS article
000468912000020
EID of the result in the Scopus database
2-s2.0-85065211757