Category Archives: tectonics

Granites and their space problem

Look at a large-scale geological map and, provided the area is not covered in recent sediments, there will be large areas of red showing outcrops of granite. There are many ways in which rocks can be melted to produce granitic magma. … Continue reading

Categories: Ireland, tectonics

Ireland: good terrain for terrane training

The word terrane has a very specific geological meaning. Usually short for tectonostratigraphic terrane, they’ve been defined as “fault-bounded crustal blocks that preserved a geological record distinct from that of adjacent terranes” (Jones et al., 1983). The concept was first coined … Continue reading

Categories: Ireland, tectonics

The South Mayo Trough: tiny grains record huge events

Sedimentary basins have been described as ‘tape recorders’ that preserve evidence of past events. Some sedimentary basins contain ‘recordings’ of grand tectonic events – plate collisions and mountain building. The information is stored as subtle but compelling patterns in the … Continue reading

Categories: Ireland, metamorphism, sediments, tectonics

Telling stories about Irish Geology

I clearly remember the most important moment of my geological career. I was resting my back on a glacially-polished wall of gabbro, my feet in an Irish bog, talking to myself in the sunshine. As a young man with bushy hair … Continue reading

Categories: Ireland, metamorphism, mountains, tectonics