2026-06-08T01:02:45Zhttps://docta.ucm.es/rest/oai/requestoai:docta.ucm.es:20.500.14352/425532024-07-24T17:30:18Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense
author
Castiñeiras García, Pedro
author
Navidad Fernández De La Cruz, Marina
author
Casas Tuset, Josep María
author
Liesa Torre Marín, Montserrat
author
Carreras, Jordi
2023-06-20T00:25:43Z
2023-06-20T00:25:43Z
2011
0022-1376
10.1086/660889?origin=JSTOR-pdf
https://hdl.handle.net/20.500.14352/42553
http://www.press.uchicago.edu/ucp/journals/journal/jg.html
Zircon composition (U, Th, rare earth elements, and Hf) was tested as a tracer of petrogenetic processes in a set of
metaigneous rocks from two pre-Ordovician massifs in the Pyrenees, Canigo´ and Albera. Two groups were differentiated
after analyzing a number of elements in zircon: (1) Casemı´ gneiss and Marialles amphibolite and (2) subvolcanic
metaporphyries and Cadı´ and Sureda orthogneisses. Casemı´ gneiss and Marialles amphibolite from the Canigo´
massif have high Th, Th/U, and Ce/Sm and low Yb/Gd and U/Ce that define linear trends in most of the plots used.
The anomalous trend of the data in the Th/U-versus-Hf plot suggests mantle involvement in the origin of these rocks
and the participation of fractional crystallization during their evolution. Zircon of the metaporphyries and the Cadı´
and Sureda orthogneisses exhibit similar characteristics despite a difference in age. Zircon has low Th, Th/U, Ce/
Sm, and and high Yb/Gd and U/Ce, suggesting that this mineral grew in a melt formed by anatexis of a ∗ Eu/Eu
continental crust, with stable plagioclase. These petrogenetic data are consistent with the previously studied wholerock
geochemistry and Sr-Nd isotopes and confirmthe use of zircon as a marker of petrogenetic processes in preference
to a lithological tracer.
eng
Petrogenesis of Ordovician Magmatism in the Pyrenees (Albera and
Canigó Massifs) Determined on the Basis of Zircon Minor
and Trace Element Composition
journal article
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