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Stellar halos contain tracers of the assembly history of massive galaxieslike our own. Exploiting the synergy between the TGAS and the spectroscopicRAVE surveys, Helmi et al. (2017) recently discovered several distinctsubstructures in the Solar neighbourhood, defined in integrals of motion space.Some of these substructures may be examples of the building blocks that builtup the stellar halo. We analyse the chemical properties of stars in thesesubstructures, with focus on their iron and $\alpha$-element abundances asprovided by the RAVE survey chemical pipeline. We perform comparisons of the\feh and \mgfe distributions of the substructures to that of the entire halosample defined in the TGAS$\times$RAVE dataset.We find that over half of thenine substructures have $\sigma_{\text{[Fe/H]}} \leq 0.3$~dex. Two of thesubstructures have $\sigma_{\text{[Fe/H]}} \leq 0.1$~dex, which makes thempossible remnants of disrupted globular clusters. As expected mostsubstructures and the vast majority of our stellar halo sample are$\alpha$-enhanced. Only one substructure shows a distinct [Mg/Fe] vs [Fe/H]abundance trend distinct from the rest of the halo stars in our sample.

Flavours in the box of chocolates: chemical abundances of kinematic substructures in the nearby stellar halo