We investigate the gluonic structure of nuclei within a mean-field model of nuclear structure based upon the self-consistent modification of the structure of a bound nucleon, with the nucleon described by the Nambu--Jona-Lasinio model. This approach has been shown to reproduce the European Muon Collaboration (EMC) effect, involving the ratio of the spin-independent structure functions of a heavier nucleus to that of the deuteron. It also predicts a significant nuclear modification for the spin structure functions, known as the polarized EMC effect. Here we report sizeable nuclear modifications of the gluon distributions (a gluon EMC effect) for the ratios of both the unpolarized and polarized gluon distributions in nuclear matter to those of a free nucleon.
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