Links between mantle metasomatism and lithium isotopes: Evidence from glass-bearing and cryptically metasomatized xenoliths from Mongolia
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F08%3A00000199" target="_blank" >RIV/00025798:_____/08:00000199 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
Links between mantle metasomatism and lithium isotopes: Evidence from glass-bearing and cryptically metasomatized xenoliths from Mongolia
Original language description
Li and ?7Li data are presented for Mongolian peridotite xenoliths. These range from fertile lherzolites, with LREE-depleted patterns and little or no metasomatism, to refractory harzburgites characterized by strong LREE-enrichments, negative HFSE anomalies and high Zr/Hf; the latter rocks were likely metasomatized by carbonate-rich melts. The majority of the peridotites show differences in Li (1-1.7 ppm) and ?7Li (+3.8 to +5.7 per thousand), but these variations are not related to any indices of metasomatism. Two xenoliths with abundant melt pockets are enriched in Li (~ 4 ppm) as a result of a metasomatic event that promoted incipient melting; those pockets have lower ?7Li than coexisting olivines. We explain this as an effect of late-stage diffusivefractionation with preferential 6Li re-distribution into the newly formed melt. Another Mongolian xenolith shows a larger ?7Li difference between cpx and melt pocket, in accord with studies of Li isotope fractionation between mantle phase
Czech name
Spojeni mezi plastovou metasomatosou a isotopy lithia: doklad ze sklonosnych a skryte metasomatisovanych xenolitu z Mongolska
Czech description
Li and ?7Li data are presented for Mongolian peridotite xenoliths. These range from fertile lherzolites, with LREE-depleted patterns and little or no metasomatism, to refractory harzburgites characterized by strong LREE-enrichments, negative HFSE anomalies and high Zr/Hf; the latter rocks were likely metasomatized by carbonate-rich melts. The majority of the peridotites show differences in Li (1-1.7 ppm) and ?7Li (+3.8 to +5.7 per thousand), but these variations are not related to any indices of metasomatism. Two xenoliths with abundant melt pockets are enriched in Li (~ 4 ppm) as a result of a metasomatic event that promoted incipient melting; those pockets have lower ?7Li than coexisting olivines. We explain this as an effect of late-stage diffusivefractionation with preferential 6Li re-distribution into the newly formed melt. Another Mongolian xenolith shows a larger ?7Li difference between cpx and melt pocket, in accord with studies of Li isotope fractionation between mantle phase
Classification
Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
DD - Geochemistry
OECD FORD branch
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Result continuities
Project
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Continuities
Z - Vyzkumny zamer (s odkazem do CEZ)
Others
Publication year
2008
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Earth and Planetary Science Letters
ISSN
0012-821X
e-ISSN
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Volume of the periodical
276
Issue of the periodical within the volume
1-2
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
9
Pages from-to
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UT code for WoS article
261679200021
EID of the result in the Scopus database
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