2026-06-08T14:03:12Zhttps://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
Petrogenesis of Ordovician Magmatism in the Pyrenees (Albera and
Canigó Massifs) Determined on the Basis of Zircon Minor
and Trace Element Composition
Castiñeiras García, Pedro
Navidad Fernández De La Cruz, Marina
Casas Tuset, Josep María
Liesa Torre Marín, Montserrat
Carreras, Jordi
552.3
Petrogenesis
Ordovician
Zircon
Petrología
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.
Depto. de Mineralogía y Petrología
Fac. de Ciencias Geológicas
TRUE
pub
2023-06-20T00:25:43Z
2023-06-20T00:25:43Z
2011
journal article
https://hdl.handle.net/20.500.14352/42553
0022-1376
10.1086/660889?origin=JSTOR-pdf
eng
open access
application/pdf
University of Chicago Press