Crystal chemistry and origin of epidote-(Sr) in alkaline rocks of the teschenite association (Silesian Unit, Outer Western Carpathians, Czech Republic)

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Crystal chemistry and origin of epidote-(Sr) in alkaline rocks of the teschenite association (Silesian Unit, Outer Western Carpathians, Czech Republic)

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Crystal chemistry and origin of epidote-(Sr) in alkaline rocks of the teschenite association (Silesian Unit, Outer Western Carpathians, Czech Republic)

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Mineralogy and Petrology

ISSN

—

e-ISSN

1438-1168

Svazek periodika

2024

Číslo periodika v rámci svazku

118

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

16

Strana od-do

55-70

Kód UT WoS článku

001104829600001

EID výsledku v databázi Scopus

2-s2.0-85176332179