The Arrochar Igneous Complex

Leader: Dr Chris Burton

The complex is one of a group of mid-to-late Silurian post-orogenic intrusions, ranging in composition from granites to gabbros, which cut the Southern Highland Group. Together these intrusions form the Southern Grampian suite of igneous rocks. The Complex itself is crudely concentric in form and composed of an outer pyroxene-mica-diorite which encloses a quartz-diorite within which is a granodiorite. The complex is in the form of a narrow steeply-inclined body with a marked aureole of hornfelsed Dalradian rocks. A quarry and numerous stream exposures will allow us to view the range of igneous types and accompanying lamprophyric dykes, as well as the margins of the intrusion.

£15 deposit. This is set at a level to recover the anticipated costs of the trip. In addition, please be aware that any balance of costs will be recovered by a small surcharge on the day of the excursion.

Leaving Gregory Building at 9:00, travelling by coach