  We report on the multiphase absorption-line system detected at a redshift z =
3.021 in the spectrum of the quasi-stellar object CTQ 325 (z_em = 3.212). The
system is displaced by ~14,000 km/s to the blue of the systemic velocity
defined by the center of the symmetric OI quasar emission line. It consists of
shallow and broad (~700 km/s, FWHM) absorption lines of HI 1215, CIV 1548,1550,
and OVI 1032,1038, produced by collisionally ionized gas and of narrow
absorption lines (FWHM < 20 km/s) of Ly-alpha, Ly-beta, ..., Ly-6, SiIII 1206,
and CIII 977 produced by photoionized gas. Possible origins of this system are
discussed.
