From source to surface: clues from garnet‑bearing Carboniferous silicic volcanic rocks, Iberian Pyrite Belt, Portugal
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985831%3A_____%2F24%3A00584461" target="_blank" >RIV/67985831:_____/24:00584461 - isvavai.cz</a>
Result on the web
<a href="https://link.springer.com/article/10.1007/s00410-024-02106-3" target="_blank" >https://link.springer.com/article/10.1007/s00410-024-02106-3</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/s00410-024-02106-3" target="_blank" >10.1007/s00410-024-02106-3</a>
Alternative languages
Result language
angličtina
Original language name
From source to surface: clues from garnet‑bearing Carboniferous silicic volcanic rocks, Iberian Pyrite Belt, Portugal
Original language description
This work investigates the relationships between partial melting, melt extraction, pluton growth and silicic volcanism in garnet-bearing felsic volcanic rocks that were extruded in the Iberian Pyrite Belt, at ca. 345 Ma. The garnets are of peritectic origin, displaying textural and chemical features of disequilibrium crystallization during partial melting reactions involving biotite at high temperatures (up to 870 °C) in the middle-lower crust. Major element composition suggests compositional equilibrium with the entrained and pinitized peritectic cordierite, but reveals some subsequent homogenization by diffusion. Trace element maps and spot analyses of garnet show, nonetheless, significant trace element variations, reflecting biotite and Y-REE-P-rich accessory phase breakdown during partial melting reactions. Peritectic garnet and cordierite growth resulted in the preservation of Th- and Y-rich prograde suprasolidus monazite, which constrains the timing of partial melting of the metapelitic protolith at ca. 356.8 ± 2.4 Ma. The zircon cargo further shows that a significant amount of zircon crystalsfrom previously crystallized felsic melts were also remobilized and erupted. These were likely stored in an upper crustal pluton that grew episodically since ca. 390 Ma during voluminous melt generation periods within the middle to lower crust, which also resulted in voluminous volcanism. The geochemical trends of the felsic volcanic rocks reflect the entrainment of xenoliths of peritectic garnet, cordierite and feldspar, and as such, the garnet-bearing felsic volcanic rocks represent an erupted mixture of a lower-temperature (ca. 770 °C) silicic melt and autocrysts, and peritectic phases and zircon crystals from previously crystallized and stored felsic melts.
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
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
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
Contributions to Mineralogy and Petrology
ISSN
0010-7999
e-ISSN
1432-0967
Volume of the periodical
179
Issue of the periodical within the volume
32
Country of publishing house
DE - GERMANY
Number of pages
30
Pages from-to
32
UT code for WoS article
001187646000002
EID of the result in the Scopus database
2-s2.0-85188110140