Abstract

Two aspects of the timing of geological events in the circum-Pacific area are treated here. First, the tectonic history is considered on the basis of regional correlation. The circum-Pacific belt has been mobile in various ways since the late Precambrian and orogeny proceeded poly-cyclically without showing stabilized termination in any cycle. A major evolutionary development with an adolescent stage in late Mesozoic times is recognized.Second, the timing of the late Mesozoic events is examined in more detail, using Japan as an example. Tectonic movements proceeded for long periods of time, with several intermittent impulses or stepwise accelerations of major or minor degree. Minor movements are compatible with the tectonic displacement at the time of earthquakes. Igneous activity, including emplacement of granitic bodies and some associated volcanism, was long-lasting, and episodic in space and time.

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