Crystal chemistry and origin of epidote-(Sr) in alkaline rocks of the teschenite association (Silesian Unit, Outer Western Carpathians, Czech Republic)
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F23%3A10168881" target="_blank" >RIV/00025798:_____/23:10168881 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1007/s00710-023-00847-w" target="_blank" >https://doi.org/10.1007/s00710-023-00847-w</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/s00710-023-00847-w" target="_blank" >10.1007/s00710-023-00847-w</a>
Alternative languages
Result language
angličtina
Original language name
Crystal chemistry and origin of epidote-(Sr) in alkaline rocks of the teschenite association (Silesian Unit, Outer Western Carpathians, Czech Republic)
Original language description
A new occurrence of epidote-(Sr) CaSr(Al2Fe3+)[Si2O7][SiO4]O(OH), Sr-REE-rich epidote and Sr-rich allanite-(Ce) is located in Lower Cretaceous, Sr-rich hydrothermally altered leucocratic dykes penetrating alkaline igneous rocks (teschenites) near the Nový Jičín town (the Silesian Unit, Outer Western Carpathians). The dykes contain phenocrysts of pyroxene, amphibole, biotite, fluorapatite and dominant felsic groundmass consisting mostly of alkali feldspars and zeolites (analcime, natrolite and thomsonite-Ca). Accessory minerals include Ti-rich magnetite, prehnite, chamosite, pyrite, calcite, (OH, F)-rich grossular, epidote-group minerals, HFSE-, REE-rich minerals, Sr-rich baryte and slawsonite. The Sr-rich epidote forms columnar crystals or irregular aggregates, which are mostly spatially related to chamosite-titanite pseudomorphs; it contains 0.15-0.81 apfu Sr, LESS-THAN OR EQUAL TO 0.55 apfu REE; Fe3+/(Fe3+ + Al) = 0.16-0.48. The Sr2+ substitutes Ca2+ in the A2 site by a coupled substitution involving other A2 (REE3+, Th4+) or M (Al3+, Fe3+, Fe2+) cations. The Sr-rich epidote crystallized from hydrothermal solutions, probably at temperatures between ~ 250-430 oC, during cooling of the host rock. The dykes show higher Sr contents (5680-7830 ppm) and 87Sr/86Sri(120 Ma) ratios (~ 0.7046-0.7047) compared to host mesocratic teschenites (1310-1470 ppm Sr and ~ 0.7038-0.7045, respectively). The Sr isotopes indicate origin of most Sr from primary magmatic plagioclase in parent teschenite. Nevertheless, there also participated external fluids, derived from the Lower Cretaceous seawater or diagenetic waters related to associated siliciclastic sediments with 87Sr/86Sri(120 Ma) = ~ 0.7073-0.7083. These more radiogenic sources contributed at least 6-21% of the bulk Sr budget of the studied Sr-rich epidote-bearing leucocratic dykes.
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
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
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
Mineralogy and Petrology
ISSN
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e-ISSN
1438-1168
Volume of the periodical
2024
Issue of the periodical within the volume
118
Country of publishing house
DE - GERMANY
Number of pages
16
Pages from-to
55-70
UT code for WoS article
001104829600001
EID of the result in the Scopus database
2-s2.0-85176332179