Ultrapotassic magmatism in the heyday of the Variscan Orogeny: the story of the Třebíč Pluton, the largest durbachitic body in the Bohemian Massif
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F20%3A00000111" target="_blank" >RIV/00025798:_____/20:00000111 - isvavai.cz</a>
Alternative codes found
RIV/67985831:_____/20:00525320 RIV/00216208:11310/20:10416439
Result on the web
<a href="https://link.springer.com/article/10.1007/s00531-020-01872-2" target="_blank" >https://link.springer.com/article/10.1007/s00531-020-01872-2</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/s00531-020-01872-2" target="_blank" >10.1007/s00531-020-01872-2</a>
Alternative languages
Result language
angličtina
Original language name
Ultrapotassic magmatism in the heyday of the Variscan Orogeny: the story of the Třebíč Pluton, the largest durbachitic body in the Bohemian Massif
Original language description
The Trebic Pluton (TP) comprises plutonic rocks of the `durbachite series', i.e., ultrapotassic biotite-amphibole quartz melasyenites-melagranites with conspicuous K-feldspar phenocrysts and abundant mafic enclaves. The TP with its satellite bodies intruded the eastern Moldanubian Zone (orogenic root of the Variscan Bohemian Massif) at c. 338 Ma. Overall, the entire TP durbachite series -(SiO2 = 52-67 wtpercent) remains highly magnesian, reduced, and ( except when strongly contaminated) metaluminous. The durbachitic rocks are markedly enriched in lithophile elements (esp. Cs, Rb, Th, U, K and Pb) and LREE; in contrast, the contents of high-field strength elements (Nb, Ta, and Ti) and Sr are much lower, resulting in conspicuous negative anomalies in Primitive mantle-normalized multielement plots. The proposed petrogenetic model requires re-enrichment of the depleted, harzburgitic lithospheric mantle by deeply subducted crustal material of the Saxothuringian lower plate, directly and/or via (U)HP melt/fluid. This process produced phlogopite-rich metasomes (phlogopite harzburgites and/or glimmerites). The metasomes re-melted soon thereafter by a short thermal pulse caused by slab break-off or decompression melting of rising diapirs of the relatively light metasomatized mantle, yielding primary ultrapotassic melts (87Sr/86Sr337 > 0.712 and similar to Eps337Nd = 7.6). Upon their passage through the Moldanubian upper plate, ultrapotassic primary magmas mixed with felsic anatectic melts (87Sr/86Sr337 < 0.710; similar to Eps337 Nd > - 6.5). K-feldspar-driven fractional crystallization +/- accumulation represented only a late modifying influence. The occurrence of such ultrapotassic enriched/crustally contaminated mantle-derived magmatism complicates any conventional mass-balance assessments of relative roles of crustal recycling vs. growth in hot collisional orogens, e.g., Variscides or Himalayas.
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/GA18-24378S" target="_blank" >GA18-24378S: Petrogenesis of (ultra-)potassic magmas in the European Variscides – implications for development of collisional orogens and crustal growth models</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
International Journal of Earth Sciences
ISSN
1437-3254
e-ISSN
—
Volume of the periodical
109
Issue of the periodical within the volume
May
Country of publishing house
DE - GERMANY
Number of pages
44
Pages from-to
1767-1810
UT code for WoS article
000542409900016
EID of the result in the Scopus database
2-s2.0-85085756349