Abstract
Baddeleyite occurs both in vugs and in the groundmass of a holocrystalline volcanic ejectum from the Vico volcanic complex collected at Tre Croci, near Viterbo. The host rock is composed of abundant K-feldspar and minor plagioclase, biotite, clinopyroxene and a feldspathoid (sodalite). Baddeleyite is typically associated with zirconolite, pyrochlore and hellandite. Cell dimensions, computed by least-squares refinement are:a(Å)=5.154(4),b(Å)=5.219(5),c(Å)=5.332(3),β(°)=99.08(6),V(Å3)=141.6(2). The composition of baddeleyite from Tre Croci is very close to ZrO2, but includes significant amounts of Hf, Ti, Nb, U, REE and Fe.
Riassunto
Nell’apparato vulcanico vicano la baddeleyite si ritrova sia nelle cavità miarolitiche che nella massa di fondo di un proietto olocristallino raccolto a Tre Croci, vicino Viterbo. La roccia è costituita da abbondante K-feldspato, con plagioclasio, biotite, clinopirosseno e un feldspatoide (sodalite) come accessori. La baddeleyite è tipicamente associata a zirconolite, pirocloro e hellandite. Le dimensioni della cella, raffinate con i minimi quadrati, sono:a(Å)=5.154(4),b(Å)=5.219(5),c(Å)=5.332(3),β(°)=99.08(6),V(Å3)=141.6(2). Chimicamente la baddeleyite di Tre Croci è molto vicina a ZrO2, ma contiene tenori significativi di Hf, Ti, Nb, U, REE e Fe.
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Nella seduta del 14 novembre 1997.
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Bellatreccia, F., Della Ventura, G., Parodi, G.C. et al. Baddeleyite from the vico volcanic complex, latium Italy. Rend. Fis. Acc. Lincei 9, 27–33 (1998). https://doi.org/10.1007/BF02904453
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DOI: https://doi.org/10.1007/BF02904453