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The Milky Way has undergone significant transformations in its early history,characterised by violent mergers and the accretion of satellite galaxies. Amongthese events, the infall of the satellite galaxy Gaia-Enceladus/Sausage isrecognised as the last major merger event, fundamentally altering the evolutionof the Milky Way and shaping its chemo-dynamical structure. However, recentobservational evidence suggests that the Milky Way remains undergone notableevents of star formation in the past 4 Gyr, which is thought to be triggered bythe perturbations from Sagittarius dwarf galaxy (Sgr). Here we report chemicalsignatures of the Sgr accretion event in the past 4 Gyr, using the [Fe/H] and[O/Fe] ratios in the thin disc, which is reported for the first time. Itreveals that the previously discovered V-shape structure of age-[Fe/H] relationvaries across different Galactic locations and has rich substructures.Interestingly, we discover a discontinuous structure at z$_{\rm max}$ $<$ 0.3kpc, interrupted by a recent burst of star formation from 4 Gyr to 2 Gyr ago.In this episode, we find a significant rise in oxygen abundance leading to adistinct [O/Fe] gradient, contributing to the formation of young O-rich stars.Combined with the simulated star formation history and chemical abundance ofSgr, we suggest that the Sgr is an important actor in the discontinuouschemical evolution of the Milky Way disc.

Imprints of Sagittarius accretion event: Young O-rich stars and discontinuous chemical evolution in Milky Way disc