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Substructure in globular cluster (GC) populations around large galaxies isexpected in galaxy formation scenarios that involve accretion or merger events,and it has been searched for using direct associations between GCs andstructure in the diffuse galaxy light, or with GC kinematics. Here, we presenta search for candidate substructures in the GC population around the Virgo cDgalaxy M87 through the analysis of the spatial distribution of the GCcolors.~The study is based on a sample of $\sim\!1800$ bright GCs withhigh-quality $u,g,r,i,z,K_s$ photometry, selected to ensure a low contaminationby foreground stars or background galaxies.~The spectral energy distributionsof the GCs are associated with formal estimates of age and metallicity, whichare representative of its position in a 4-D color-space relative to standardsingle stellar population models.~Dividing the sample into broad bins based onthe relative formal ages, we observe inhomogeneities which reveal signatures ofGC substructures.~The most significant of these is a spatial overdensity of GCswith relatively young age labels, of diameter $\sim\!0.1$\,deg($\sim\!30\,$kpc), located to the south of M87.~The significance of thisdetection is larger than about 5$\sigma$ after accounting for estimates ofrandom and systematic errors.~Surprisingly, no large Virgo galaxy is present inthis area, that could potentially host these GCs.~But candidate substructuresin the M87 halo with equally elusive hosts have been described based onkinematic studies in the past.~The number of GC spectra available around M87 iscurrently insufficient to clarify the nature of the new candidate substructure.

Next Generation Virgo Cluster Survey (NGVS). XXXII:~Search for a Globular Cluster Substructure in the Virgo Galaxy Cluster Core