diachronism
/dʌɪˈakrənɪz(ə)m
/noun [mass noun] Geology
The occurrence of a feature or phenomenon in different geological periods.This is interpreted to reflect both diachronism in fault reactivation and variable distance from source area to sub-basin, causing variable delays between basin-margin faulting and clastic deposition in the basin....
- A typical example of diachronism would be a sequence of beds deposited in a shallow sea that gradually encroaches upon the land.
- Therefore, this flexural model could provide an explanation for the above mentioned diachronism.
Derivatives
diachronous
- The scattered nature of the outcrop and the possibility of diachronous volcanism mean that all rocks grouped as Dokhan Volcanic Series may not be coeval.
- Thirlwall proposed a diachronous end to magmatism from NW to SE across Scotland and NE England.
- The parallel retreat of slopes through time in the Penck scheme means that the age of the pediplain is time-transgressive or diachronous, that is, the age varies across the surface of the pediplain.
diachronously
- The total length of rifted margin was more than 25,000 km, suggesting a staggered climatic response to uplift as rifting progressed diachronously, somewhat like a zipper.
- It is during this interval that graptolitic shales are diachronously replaced by shelly, Hirnantia Fauna-bearing limestones, first in the shallower-water and later in the deeperwater portions of the Yangtze Platform.
- Despite their proximity, individual basins developed diachronously and did not share basin-bounding faults.