Cambro–Ordovician anatexis and magmatic recycling at the thinned Gondwana margin: new constraints from the Kouřim Unit, Bohemian Massif
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F20%3A00508957" target="_blank" >RIV/67985530:_____/20:00508957 - isvavai.cz</a>
Alternative codes found
RIV/00025798:_____/19:00000214 RIV/67985831:_____/20:00508957
Result on the web
<a href="https://jgs.lyellcollection.org/content/177/2/325.abstract" target="_blank" >https://jgs.lyellcollection.org/content/177/2/325.abstract</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1144/jgs2019-037" target="_blank" >10.1144/jgs2019-037</a>
Alternative languages
Result language
angličtina
Original language name
Cambro–Ordovician anatexis and magmatic recycling at the thinned Gondwana margin: new constraints from the Kouřim Unit, Bohemian Massif
Original language description
The Kouřim Unit represents one of the largest pre-Variscan meta-igneous complexes in the Bohemian Massif and a geochronological, whole-rock geochemical and Sr-Nd isotopic study was conducted to better understand the magmatic evolution of the Early Paleozoic Gondwana margin. Five orthogneisses yield U-Pb zircon ages ranging from 492 +/- 4 to 484 +/- 2 Ma. Two leucogranites give U-Pb zircon ages of 500 +/- 4 and 485 +/- 2 Ma, interpreted to be inherited from their orthogneiss host rock. Two samples from the metasedimentary host rock are dominated by Neoproterozoic-Cambrian detrital zircons. The abundance of zircon inheritance in the orthogneisses and whole-rock Sr-Nd isotopic composition imply an origin from relatively mature continental crustal material. The subalkaline, subaluminous-slightly peraluminous and high-K calc-alkaline arc-like geochemical signature of the orthogneisses is interpreted as inherited from the recycled Cadomian metasedimentary source and both the magmatic and metasedimentary rocks are correlated with similar occurrences in the adjacent Moldanubicum and Tepla-Barrandian Unit. The Late Cambrian-Early Ordovician magmatic activity is linked to crustal anatexis, which was probably initiated by thermal and gravitational relaxation of the thickened Cadomian arc-type crust, followed by lithospheric thinning assisted by far-field forces. The extensional event led to the formation of a passive margin associated with the opening of the Rheic Ocean.
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
—
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
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
Journal of the Geological Society
ISSN
0016-7649
e-ISSN
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Volume of the periodical
177
Issue of the periodical within the volume
2
Country of publishing house
GB - UNITED KINGDOM
Number of pages
17
Pages from-to
325-341
UT code for WoS article
000537276100007
EID of the result in the Scopus database
2-s2.0-85081136852