In the article Passive margins through earth history (Bradley, 2008), a passive margin is defined as:
a synonym for the bulkier Atlantic-type margin, trailing-edge margin, rifted margin, or divergent margin. A passive margin is one formed by rifting followed by seafloor spreading, so that the resulting plate consists of both continental and oceanic lithosphere, welded across an igneous contact.
In the research, the author determined that in terms of the abundance of passive margins that the distribution varied with time, from the article:
They were abundant at 1900–1890, 610–520, and 150–0 Ma, scarce at ca. 2445–2300, 1600–1000, and 300–275 Ma, and absent before ca. 3000 Ma and at 1740–1600.
The absence of passive margins older than 3000 million years is uncertain, possibly due to lack of preservation; however the absence between 1740-1600 million years is described vaguely by the author as being the result of
One by one, each of these margins collided with something, leaving no passive margins at all
possibly related to the coalescencing of the "supercontinent" Nuna - but the total absence is not noted in association with other supercontinents (Rodinia, Pangaea etc).
What does the absence of passive margins between 1740-1600 million years ago tell us about the tectonic environment at that time?