Interaction of seawater with (ultra)mafic alkaline rocks-Alternative process for the formation of aegirine
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27350%2F24%3A10254928" target="_blank" >RIV/61989100:27350/24:10254928 - isvavai.cz</a>
Alternative codes found
RIV/00025798:_____/24:10169056 RIV/61989592:15310/24:73626648
Result on the web
<a href="https://pubs.geoscienceworld.org/ammin/issue/109/3" target="_blank" >https://pubs.geoscienceworld.org/ammin/issue/109/3</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.2138/am-2023-8928" target="_blank" >10.2138/am-2023-8928</a>
Alternative languages
Result language
angličtina
Original language name
Interaction of seawater with (ultra)mafic alkaline rocks-Alternative process for the formation of aegirine
Original language description
Submarine mafic and relatively Na-poor alkaline rocks in the Outer Carpathians often contain aegirine, a sodic pyroxene usually found in diferentiated alkaline rocks. Its presence in rocks that are too basic and Na-poor for its conventional magmatic appearance is linked to sodic alteration of submarine alkaline rocks. Aegirine crystals grow on altered rims of diopside, commonly with crystallographic unconformity, suggesting that their growth was related to alteration and that aegirine does not represent a late stage of continuous clinopyroxene crystallization. The U-shaped REE patterns in the studied aegirine lack Eu anomaly, characteristic for aegirine from differentiated alkaline rocks. Therefore, the involvement of chemically more evolved magma is unlikely to have played any role in the formation of aegirine in ijolites and essexites. Formation of aegirine in submarine alkaline rocks may thus represent an alternative process to spilitization. However, this process is strongly limited by the availability of Fe3+ oxidized and mobilized by hydrothermal alteration, which may explain a relative scarcity of aegirine observed in submarine alkaline rocks compared to near-complete albitization of spilites, and its absence in high-MgO rocks (>10 wt%). Due to the blocking effect related to Fe3+ unavailability, ijolites, and essexites do not display significant Na enrichment. We posit that Na incorporated in aegirine was mainly sourced from the zeolitized interstitial glass.
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
10507 - Volcanology
Result continuities
Project
<a href="/en/project/GA21-30043S" target="_blank" >GA21-30043S: Petrogenesis and emplacement of deep-marine alkaline basaltoids: a case of Early Cretaceous magmatism in the northern Tethys region</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
American Mineralogist
ISSN
0003-004X
e-ISSN
1945-3027
Volume of the periodical
109
Issue of the periodical within the volume
3
Country of publishing house
US - UNITED STATES
Number of pages
14
Pages from-to
488-501
UT code for WoS article
001183294700011
EID of the result in the Scopus database
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