We report on a trapped atom interferometer based on Bragg diffraction andBloch oscillations with alkaline-earth-metal atoms. We use a Ramsey-Bord\'eBragg interferometer with $^{88}$Sr atoms combined with Bloch oscillations toextend the interferometer time. Thanks to a long coherence time for Blochoscillations of $^{88}$Sr atoms, we observed interference up to 1 s evolutiontime in the lattice. A detailed study of decoherence sources during the Blochphase is also presented. While still limited in sensitivity by lattice lifetimeand beam inhomogeneity this result opens the way to high contrast trappedinterferometers with extended interrogation time.
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