RT Journal Article
T1 Petrogenesis of Ordovician Magmatism in the Pyrenees (Albera andCanigó Massifs) Determined on the Basis of Zircon Minorand Trace Element Composition
A1 Castiñeiras García, Pedro
A1 Navidad Fernández De La Cruz, Marina
A1 Casas Tuset, Josep María
A1 Liesa Torre Marín, Montserrat
A1 Carreras, Jordi
AB Zircon composition (U, Th, rare earth elements, and Hf) was tested as a tracer of petrogenetic processes in a set ofmetaigneous rocks from two pre-Ordovician massifs in the Pyrenees, Canigo´ and Albera. Two groups were differentiatedafter analyzing a number of elements in zircon: (1) Casemı´ gneiss and Marialles amphibolite and (2) subvolcanicmetaporphyries 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 rocksand 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/Eucontinental crust, with stable plagioclase. These petrogenetic data are consistent with the previously studied wholerockgeochemistry and Sr-Nd isotopes and confirmthe use of zircon as a marker of petrogenetic processes in preferenceto a lithological tracer.
PB University of Chicago Press
SN 0022-1376
YR 2011
FD 2011
LK https://hdl.handle.net/20.500.14352/42553
UL https://hdl.handle.net/20.500.14352/42553
LA eng
DS Docta Complutense
RD 6 abr 2025