Abstract <p>Statistical analysis of the time series of Cu-porphyry deposits of the Pacific Belt and their total ore volume formed during the last 125 Ma revealed the presence of a quasi-cyclic component with a period of 26–28 Ma. The share of this component in the total amplitude is 74%. An inverse correlation has been established between the global spreading rate, on the one hand, and a number of Cu-porphyry deposits in the Pacific Belt and their productivity, on the other, over the last 125 Ma. The relative minimum values of the spreading rate preceded the relative maxima of the number and total volume of Cu-porphyry deposits in the Pacific Belt by 5–10 Ma. During the formation of large and giant Cu-porphyry deposits in the Pacific Belt, the rate of change in convergence angle in the horizontal plane in the zone of interaction between two tectonic plates increases. At the same time, the absolute rate of convergence can both decrease and increase. According to geological, structural and kinematic data, magmatism, which led to the formation of eight large and giant Cu-porphyry deposits, was accompanied by the through-crust disjunctive faults. The development of the latter was associated either with a change of the orthogonal convergence by the “oblique” one or a transition to the regime of a transform continental margin, or with a reversible change in the direction of subduction due to the island arc–continent or island arc-oceanic plateau types of collision.</p>