Category Archives: tectonics

The Grampian / Taconic orogeny in Ireland – when arcs attack

Ever since the plate tectonic paradigm-shift of the 1960s, geologists have strived to understand ancient rocks in terms of the movements of plates. The geology of north-western Ireland can be explained by what happened when a subduction zone ran out … Continue reading

Categories: Ireland, metamorphism, mountains, subduction, tectonics

Scandinavian crust now in Alaska!

The face of the earth is ever changing. Plate tectonics is slowly but surely rearranging the locations and inter-connections of continents. However knowing this in the abstract doesn’t prepare you for the awed surprise of discovering that a section of … Continue reading

Categories: mountains, tectonics

Dalradian – a Celtic Supergroup

Geology is such a great thing to study because it involves making so many connections through time and space, switching scales from the cosmic to the atomic. This means that challenge for this series of posts about the geology of … Continue reading

Categories: Ireland, Scotland, sediments, tectonics

Cratons – old and strong

Cratons are pieces of continents that have been stable for a over a billion years. As earth’s plates drift along, mountains periodically rise and fall, plate boundaries appear and disappear. But cratons are like great-grandmothers at family gatherings, while younger … Continue reading

Categories: eclogites, mountains, subduction, tectonics