  We present a temperature-dependent x-ray absorption (XAS) and resonant
elastic x-ray scattering (REXS) study of the metal-insulator transition (MIT)
in Sr3(Ru1-xMnx)2O7. The XAS results reveal that the MIT drives the onset of
local antiferromagnetic correlations around the Mn impurities, a precursor of
the long-range antiferromagnetism detected by REXS at T_order<T_MIT. This
establishes that the MIT is of the Mott-type (electronic correlations) as
opposed to Slater-type (magnetic order). While this behavior is induced by Mn
impurities, the (1/4,1/4,0) order exists for a wide range of Mn concentrations,
and points to an inherent instability of the parent compound.
