A vestige of an Ediacaran magmatic arc in southeast France and its significance for the northern Gondwana margin
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F23%3A10168719" target="_blank" >RIV/00025798:_____/23:10168719 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1007/s00531-022-02277-z" target="_blank" >https://doi.org/10.1007/s00531-022-02277-z</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/s00531-022-02277-z" target="_blank" >10.1007/s00531-022-02277-z</a>
Alternative languages
Result language
angličtina
Original language name
A vestige of an Ediacaran magmatic arc in southeast France and its significance for the northern Gondwana margin
Original language description
The Maures-Tanneron Massif is a key to putting new constraints on the age, nature, and tectonic setting of pre-Variscan metaigneous rocks in the southern Variscan Belt. Whole-rock geochemistry was combined with U-Pb isotopic data on zircon to gain insight into the pre-Variscan evolution and improve the knowledge of the southern Variscan domain. The geochemical study shows that the protolith of the studied samples is a high-K calc-alkaline granodiorite emplaced in the upper plate of a subduction zone, most probably in a continental arc setting, as suggested by numerous microdioritic enclaves. Zircon cores record a spread of ages between 609 and 548 Ma and define an age peak at c. 590 Ma, interpreted as the most likely emplacement age of the granodioritic protolith. This Ediacaran population shows a consistent zircon Th/U ratio (similar to 0.5) which likely indicates long-lived magmatic activity in a continental arc setting and corroborates our geochemical interpretations. The zircon overgrowth rims give ages from 505 to 460 Ma and might be of metamorphic origin (lower Th/U ratios), related to an important tectonothermal event that developed during Lower to Middle Ordovician times. The occurrence of older zircon grains (c. 1000 Ma and c. 1800-2500 Ma), either inherited from a crustal source or incorporated from country rocks during magma ascent, provides some constraints on the paleoposition of the magmatic arc, likely situated on the eastern shelf of the northern Gondwana margin.
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
V - Vyzkumna aktivita podporovana z jinych verejnych zdroju
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
International Journal of Earth Sciences
ISSN
1437-3254
e-ISSN
1437-3262
Volume of the periodical
112
Issue of the periodical within the volume
3
Country of publishing house
DE - GERMANY
Number of pages
26
Pages from-to
925-950
UT code for WoS article
000897489300001
EID of the result in the Scopus database
2-s2.0-85143621909