О четвертичном возрасте тихоокеанских желобов

Аннотация

The paper discusses independent methods of direct determination of age of the Pacific deep-sea trenches. The methods of trench dating are based on recognition of the classic triad: «structure - age – genesis» for trenches, which have the thrust-nappe structure, while the seduction hypothesis is unproved.

The trench dating methods are analyzed using an abstracted thrust-nappe trench model, earlier developed by the authors during the study of the Kuril and Japan trenches. The direct methods of trench dating include dating correlate sediments, correlate tectonic structures (allochthon, autochthon and related faults), scarps on trench slopes, and channel net (submarine canyons of the continental slope and abyssal channels of the Pacific sea floor). The Pacific trenches appeared to be not older than Early-Middle Pleistocene (0.5 to 1 mln years ago). The trench formation epoch coincides with the Pasadena phase of progeny and folding (by H. Stille) which has probably global display and is continued up to now.