GeoLog

metamorphic geology

Imaggeo on Mondays: What a thin section has to say about the deformation of the Zagros Mountains

October 19, 2015
Imaggeo on Mondays: What a thin section has to say about the deformation of the Zagros Mountains
Deformation twinning . Credit: Amirhossein Mojtahedzadeh (distributed via imaggeo.egu.eu)

The impressive Zagros Orogeny, as seen from a bird’s-eye view, has featured on Imaggeo on Monday’s blog posts a few times recently. From its fluvial dissection features, through to a false colour LANDSAT 7 image which reveals a velociraptor hiding among fold and thrusts, we’ve looked at the broad scale structures which shape the Zagros mountains. This week, the scale changes entirely: we zoom righ ...[Read More]

Imaggeo on Mondays: Metamorphosis

March 11, 2013

This fold is part of the metamorphic core of the Pyrenees. The shear zone is almost vertical, producing a small parasitic fold (a smaller fold within a larger one), which looks almost as if it continues into the sky. The metamorphic sediments are about 500 million years old and have been deformed several times, most recently during the alpine orogeny. The alpine orogeny was period of extensive mou ...[Read More]