Compositional changes in garnet: trace element transfer during eclogite-facies metamorphism
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F23%3A10477297" target="_blank" >RIV/00216208:11310/23:10477297 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=Xdw61Xf.3Z" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=Xdw61Xf.3Z</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/s00410-023-02050-8" target="_blank" >10.1007/s00410-023-02050-8</a>
Alternative languages
Result language
angličtina
Original language name
Compositional changes in garnet: trace element transfer during eclogite-facies metamorphism
Original language description
The compositional zoning of the major divalent cations in metamorphic garnet is a useful tool in reconstructing the pressure-temperature path. However, trace elements can provide a better-preserved record of petrogenetic evolution due to their strong affinity in garnet and slow diffusion rates. In this study, three high-pressure micaschist samples of varying composition and garnet textures from the Krusne hory Mountains (Saxothuringian zone, Bohemian Massif) were examined. By utilizing electron probe micro-analysis and laser ablation inductively coupled plasma mass spectrometry, three distinct types of compositional zoning in garnet were identified by compositional mapping. The zoning types were classified as continuous core-to-rim change, concentric annular changes, and overprinting of a pre-existing distribution; all three provide information on the original mineral composition and texture before garnet overgrowth. The transition from overprint to annular zoning shows relation to temperature increment. The annular zoning allowed the identification of several coupled substitutions, including alkali (sodium and lithium) + yttrium and the alkali + phosphorus substitution which is typical of high- to ultra-high-pressure conditions. The formation of annuli zoning was interpreted to originate not only from the decomposition of trace element bearing phases, but also to be related to the availability of fluid medium during garnet growth. Two samples contained atoll texture garnets, interpreted to be originated from the dissolution of the garnet central part, chemically distinct from the new garnet growing coevally on the rim or replacing the original central part. This proposed process is evidenced by the mass balance calculation of yttrium and heavy rare earth elements between the dissolved garnet and newly formed parts.
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
<a href="/en/project/GA18-03160S" target="_blank" >GA18-03160S: Pre- to syncollisional history of metamorphic rocks in orogenic zone recorded by chemical zoning in garnet; with application to the Bohemian Massif</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Contributions of Mineralogy and Petrology
ISSN
0010-7999
e-ISSN
1432-0967
Volume of the periodical
178
Issue of the periodical within the volume
10
Country of publishing house
DE - GERMANY
Number of pages
31
Pages from-to
68
UT code for WoS article
001064300100001
EID of the result in the Scopus database
2-s2.0-85170666352