Cambro–Ordovician anatexis and magmatic recycling at the thinned Gondwana margin: new constraints from the Kouřim Unit, Bohemian Massif

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F19%3A00000214" target="_blank" >RIV/00025798:_____/19:00000214 - isvavai.cz</a>

Alternative codes found

RIV/67985530:_____/20:00508957 RIV/67985831:_____/20:00508957

Result on the web

<a href="https://jgs.lyellcollection.org/content/early/2019/10/21/jgs2019-037" target="_blank" >https://jgs.lyellcollection.org/content/early/2019/10/21/jgs2019-037</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1144/jgs2019-037" target="_blank" >10.1144/jgs2019-037</a>

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 metaigneous complexes in the Bohemian Massif and a geochronological, whole-rock geochemical and Sr–Nd isotopic study was conducted in order to better understand the magmatic evolution of the Early Palaeozoic Gondwana margin. Five orthogneisses give U–Pb zircon ages ranging from 492 ± 4 Ma to 484 ± 2 Ma. Two leucogranites give U–Pb zircon ages of 500 ± 4 Ma 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 matured 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 Teplá–Barrandian Unit. The Late Cambrian–Early Ordovician magmatic activity is linked to crustal anatexis, which was likely 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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Type

J_SC - Article in a specialist periodical, which is included in the SCOPUS database

CEP classification

—

OECD FORD branch

10505 - Geology

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)

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of the Geological Society London

ISSN

0016-7649

e-ISSN

—

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

—

EID of the result in the Scopus database

2-s2.0-85081136852