Fact box 2.3 Injectites

Injectites, or intrusive sand accumulations, are created by post-depositional remobilisation and are squeezed through overlying strata.

These sediments are redeposited there, either as vertical/inclined dykes or intruded between strata as horizontal sills (figure 2.18 [4]).

The sands are remobilised from a parent sand. This can happen if large quantities of sediments are deposited very quickly, as a result of glacial erosion, for example - so that pressure on the underlying strata increases.

Figure 2.18 Geodiagram of injectites (modified after Hurst et al 2007)