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We perform a detailed study of lepton mixing patterns arising from a scenariowith three Majorana neutrinos in which a discrete flavor group Gf=Delta (3 n^2)or Gf=Delta(6 n^2) and a CP symmetry are broken to residual symmetries Ge=Z3and Gnu=Z2 x CP in the charged lepton and neutrino sectors, respectively. Whilewe consider all possible Z3 and Z2 generating elements, we focus on a certainset of CP transformations. The resulting lepton mixing depends on grouptheoretical indices and one continuous parameter. In order to study the mixingpatterns comprehensively for all admitted Ge and Gnu, it is sufficient todiscuss only three types of combinations. One of them requires as flavor groupDelta (6 n^2). Two types of combinations lead to mixing patterns with atrimaximal column, while the third one allows for a much richer structure. Forthe first type of combinations the Dirac as well as one Majorana phase aretrivial, whereas the other two ones predict in general all CP phases to benon-trivial and also non-maximal. Already for small values of the index n ofthe group, n <= 11, experimental data on lepton mixing can be accommodated wellfor particular choices of the parameters of the theory. We also comment on therelation of the used CP transformations to the automorphisms of Delta (3 n^2)and Delta (6 n^2).

Lepton Mixing from Delta (3 n^2) and Delta (6 n^2) and CP