  The influence of a staggered molecular field in frustrated rare-earth
pyrochlores, produced via the magnetic iridium occupying the transition metal
site, can generate exotic ground states, such as the fragmentation of the
magnetization in the Ho compound. At variance with the Ising Ho$^{3+}$ moment,
we focus on the behavior of the quasi isotropic magnetic moment of the
Gd$^{3+}$ ion at the rare-earth site. By means of macroscopic measurements and
neutron scattering, we find a complex situation where different components of
the magnetic moment contribute to two antiferromagnetic non-collinear
arrangements: a high temperature all in - all out order induced by the Ir
molecular field, and Palmer and Chalker correlations that tend to order at much
lower temperatures. This is enabled by the anisotropic nature of the Gd-Gd
interactions and requires a weak easy-plane anisotropy of the Gd$^{3+}$ moment
due to the mixing of the ground state with multiplets of higher spectral terms.
