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We present Gemini griz photometry for 521 globular cluster (GC) candidates ina 5.5 x 5.5 arcmin field centered 3.8 arcmin to the south and 0.9 arcmin to thewest of the center of the giant elliptical galaxy NGC 4486. All these objectshave previously published (C-T1) photometry. We also present new (C-T1)photometry for 338 globulars, within 1.7 arcmin in galactocentric radius, whichhave (g-z) colors in the photometric system adopted by the Virgo Cluster Surveyof the Advanced Camera for Surveys of the Hubble Space Telescope. Thesephotometric data are used to define a self-consistent multicolor grid (avoidingpolynomial fits) and preliminary calibrated in terms of two chemical abundancescales. The resulting multicolor color-chemical abundance relations are used totest GC chemical abundance distributions. This is accomplished by modelling theten GC color histograms that can be defined in terms of the Cgriz bands. Ourresults suggest that the best fit to the GC observed color histograms isconsistent with a genuinely bimodal chemical abundance distribution NGC(Z). Onthe other side, each (blue and red) GC subpopulation follows a distinctcolor-color relation.

Multicolour-metallicity Relations from Globular Clusters in NGC 4486 (M87)