Petrogenesis of Ordovician Magmatism in the Pyrenees (Albera and Canigó Massifs) Determined on the Basis of Zircon Minor and Trace Element Composition
作者： Pedro Castiñeiras , Marina Navidad , Josep M. Casas , Montserrat Liesa , Jordi Carreras
DOI: 10.1086/660889
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摘要: AbstractZircon composition (U, Th, rare earth elements, and Hf) was tested as a tracer of petrogenetic processes in set metaigneous rocks from two pre-Ordovician massifs the Pyrenees, Canigo Albera. Two groups were differentiated after analyzing number elements zircon: (1) Casemi gneiss Marialles amphibolite (2) subvolcanic metaporphyries Cadi Sureda orthogneisses. massif have high Th/U, Ce/Sm low Yb/Gd U/Ce that define linear trends most plots used. The anomalous trend data Th/U-versus-Hf plot suggests mantle involvement origin these participation fractional crystallization during their evolution. Zircon orthogneisses exhibit similar characteristics despite difference age. has Ce/Sm, U/Ce, suggesting this mineral grew melt formed by anatexis ...
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