Geology Reference
In-Depth Information
Figure 2.7
Example of detailed log on logging paper (example from Tim Watton,
Iceland).
2.4.2 Igneous layering, banding and laminar
structures in intrusions
These features, again easily recognised at outcrop scale, may originate when a
magma is partially crystallised and consists of both crystals and melt. Banding
may also result from preferential vesiculation (that is, the development of gas
bubbles) along flow lines of a lava or shallow dykes. For example, flow-banded
