[en] Not surprisingly, with the very high angular resolution of the Chandra telescope, results revealed fairly complex structures in cluster cores to be more common than expected. In particular, understanding the nature of spiral-like features at the center of some clusters is the major motivation of this work. We present results from Chandra deep observations of 15 nearby galaxy clusters (0.01< z<0.06). Using X-ray temperature and substructure maps, we detect a plume-like feature in the core of 7 clusters: A85, A426, A496, Hydra A, Centaurus, A1644 and Ophiuchus. Comparing our results to numerical simulations, our investigation lends support to the fact that these patterns are due to nonzero impact parameter mergers.