  We explore the feasibility of direct measurements of nuclear gluon densities
using heavy-quark production (open charm, beauty) at a future Electron-Ion
Collider (EIC). We focus on the regions x > 0.3 (EMC effect) and x ~ 0.05-0.1
(antishadowing), where the nuclear modifications of the gluon density offer
insight into non-nucleonic degrees of freedom and the QCD structure of
nucleon-nucleon interactions. We describe the charm production rates and
momentum distributions in nuclear deep-inelastic scattering (DIS) at large x_B,
and comment on the possible methods for charm reconstruction using
next-generation detectors at the EIC (pi/K identification, tracking, vertex
detection).
