File:Saprolitized cataclastic rocks (Brevard Zone; Old Fort, McDowell County, North Carolina, USA) 9.jpg
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English: Saprolitized cataclastic rocks in the Paleozoic of North Carolina, USA.
These scrappy looking rocks are part of the Brevard Fault Zone in the Appalachians of eastern America. The Appalachians are broadly subdivided into three physiographic provinces: Valley & Ridge, Blue Ridge, and Piedmont. Extending from Alabama to Virginia, the Brevard Zone is at the boundary between the Blue Ridge and the Piedmont ("foothills" of the Appalachian Mountains) - the latter consists of structurally deformed metamorphic and igneous rocks. The eastern boundary of the Piedmont is the Fall Line, which marks the farthest west that flooded rivers extend. The character of rivers changes at the Fall Line as they flow eastward from Piedmont rocks to Coastal Plain rocks. To the west of the Piedmont is the Blue Ridge, a relatively narrow and topographically high zone of mountains. Rocks in the Blue Ridge are principally hard, Precambrian-aged, igneous and metamorphic rocks. The Brevard Zone is thought to be an old fault zone that was active in the Late Paleozoic, when the Appalachian Mountains were forming. Some geologists interpret the Brevard Zone as a thrust fault, while others interpret it as a transform fault (strike-slip fault). Regardless, the Brevard Zone consists of cataclastic rocks, which are highly deformed fault zone rocks. Deep, long-term weathering has saprolitized these cataclastic rocks. Saprolite is a friable rock formed by intense weathering - much regolith (soil) in the Piedmont is actually saprolite (see: www.flickr.com/photos/jsjgeology/albums/72157672727177763 ). The parent rocks of the Brevard Zone were probably Neoproterozoic- to Cambrian-aged, passive margin sedimentary rocks that were metamorphosed during the Paleozoic. Active fault movement in the Brevard Zone probably occurred during the Pennsylvanian, about 310 million years ago (Vauchez, 1987). Locality: railroad cut below the Route 70 bridge at the town of Old Fort, McDowell County, western North Carolina, USA (35° 37’ 44.29" North latitude, 82° 11’ 12.31" West longitude) Reference cited: Vauchez (1987) - Brevard Fault Zone, Southern Appalachians: a medium-angle, dextral, Alleghenian shear zone. Geology 15: 669-672. |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/51359738642/ |
| 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@N05/51359738642. It was reviewed on 6 August 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 16:15, 6 August 2021 | | 3,008 × 2,000 (5.07 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/51359738642/ with UploadWizard |
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