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

            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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Taken on: March 24, 2018

Tags:

amphibolite

metamorphic

rocks

fold

folds

folded

ptygmatically

ptygmatic

North

Carolina

King's

Mountain

Pegmatite « less

Sets appears in: • North Carolina Rocks & Fossils • Amphibolite more » • Folds « less

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