File:Ptygmatically folded amphibolite (country rock of King's Mt. Pegmatite; King's Mountain, North Carolina, USA).jpg

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English: Ptygmatically folded amphibolite from North Carolina, USA. (public display, Geology Department, Wittenberg University, Springfield, Ohio, USA)

Ptygmatic folds are highly contorted folds with high amplitude-to-wavelength ratios. They occur in deformed rocks where high-viscosity areas (such as dikes or leucosomes) get folded, while the surrounding, low-viscosity, country rocks do not.

The black-colored host rock here is amphibolite, which is an amphibole-dominated metamorphic rock. It is usually weakly foliated but can be crystalline-textured. Amphibolites are principally composed of hornblende amphibole and plagioclase feldspar. Many amphibolites form by metamorphism of basalt or gabbro (= mafic igneous rocks).

Geologic context: country rock of the Kings Mountain Pegmatite

Locailty: King's Mountain, North Carolina, USA
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Source https://www.flickr.com/photos/47445767@N05/40428236750/
Author James St. John

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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/40428236750. It was reviewed on 18 October 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

18 October 2020

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current02:26, 18 October 2020Thumbnail for version as of 02:26, 18 October 20203,833 × 2,670 (7 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/40428236750/ with UploadWizard

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