| Abstract
| - We report on the multiphase absorption-line system detected at a redshift $z_{\rm abs}=3.021$ in the spectrum of the quasi-stellar object CTQ 325 ( $z_{\rm em}= 3.212$). The system is displaced by $\simeq$$14\,000$ km s -1 to the blue of the systemic velocity defined by the center of the symmetric $\ion{O}{i}$ quasar emission line. It consists of shallow and broad (~700 km s -1 FWHM) absorption lines of $\ion{H}{i}$$\lambda1215$, $\ion{C}{iv}$$\lambda\lambda1548, 1550$, and $\ion{O}{vi}$$\lambda\lambda1032, 1038$, produced by collisionally ionized gas and of narrow absorption lines ( ${\it FWHM} < 20$ km s -1) of Ly $_{\alpha, \beta, \ldots, 6}$, $\ion{Si}{iii}$$\lambda1206$, and $\ion{C}{iii}$$\lambda977$ produced by photoionized gas. Possible origins of this system are discussed.
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