Castiñeiras García, PedroNavidad Fernández De La Cruz, MarinaCasas Tuset, Josep MaríaLiesa Torre Marín, MontserratCarreras, Jordi2023-06-202023-06-2020110022-137610.1086/660889?origin=JSTOR-pdfhttps://hdl.handle.net/20.500.14352/42553Zircon 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.engjournal articlehttp://www.press.uchicago.edu/ucp/journals/journal/jg.htmlopen access552.3PetrogenesisOrdovicianZirconPetrología