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Датотека:"Liesegang banding" in quartzose sandstone (Upper Paleozoic; quarry near Crossville, Tennessee, USA) 2 (40280403530).jpg

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“Liesegang banding” in sandstone from the Upper Paleozoic of Tennessee, USA.

Irregular, reddish or brownish or orangish-brown iron oxide banding is commonly seen in many porous rocks, particularly sandstones and pebbly sandstones. These have been almost universally referred to as “Liesegang banding”, representing precipitation lines of iron-rich minerals (e.g., hematite, limonite, goethite, etc.) at & along groundwater chemical interfaces. But, according to Neil Wells of Kent State University, the original concept of Liesegang banding (Liesegang, 1896) does not match up with what is seen in the rock record (see Wells et al., 2003).

True Liesegang banding refers to parallel bands of precipitate formed by diffusion along a single chemical gradient during one event. What's seen in the rock record often consists of sets of irregularly concentric iron bands, with different sets of bands quite frequently oriented in different directions, and showing cross-cutting and dissolution of older sets. Iron banding in the rock record is clearly the result of numerous precipitation events over long periods of time by moving groundwater (Wells et al., 2003). Iron mineralization along these bands appears to be induced by the presence of either a redox interface (change from reducing to oxidizing conditions in the groundwater) or a pH interface (change in acidity).

Because Neil Wells is the first (apparently) to point out that what geologists have been calling Liesegang banding really isn’t, a renaming seems to be in order. It was jokingly suggested in 2003 that the iron banding discussed above be called “Wells Banding”. I’m all for that.


From Diemer et al. (2012) - Building Stone Walking Tour of Uptown Charlotte:

The 1.5 acre urban pocket park known as the Green is located between the 400 block of South Tryon and South College Streets, immediately west of the Charlotte Convention Center. Designed by Wagner Murray Architects of Charlotte, it was completed in 2002 and sits directly on top of a 7-level underground parking structure.

Sandstone blocks in the retaining wall

This fine-grained quartz sandstone was quarried near Crossville, Tennessee. Red iron staining highlights cross-bedding on some specimens. The high quartz content of this sandstone, deposited along the coast of an inland sea that covered most of North America in the Mississippian, about 340 million years ago, has made it a desirable and durable building stone. It is called a fieldstone because it has been left in its natural state.


Provenance: quarry near Crossville, Cumberland County, east-central Tennessee, USA

Locality: building stone in wall at "The Green", College Street & 2nd Street, downtown Charlotte, North Carolina, USA


References:

Liesegang, R.E. 1896. Ueber einige Eigenschaften von Gal-lerten [On some properties of gelatin]. Naturwissenschaftliche Wochenschrift 11: 353-362. (see also: Liesegang, R.E. 1945. Geologische Bänderungen durch Diffusion und Kapillarität [Geologic banding by diffusion and capillarity]. Chemie der Erde, Zeitschrift der Chemischen, Mineralogie, Petrographie, Geologie und Bodenkunde 15: 420-423.)

Wells, N.A., D.A. Waugh & A.M. Foos. 2003. Some notes and hypotheses concerning iron and iron remobilization features in the Sharon Formation (Summit County, Ohio). in Pennsylvanian Sharon Formation, past and present: sedimentology, hydrogeology, and historical and environmental significance, a field guide to Gorge Metro Park, Virginia Kendall Ledges in the Cuyahoga Valley National Park, and other sites in northeast Ohio. Ohio Division of Geological Survey Guidebook 18: 33-37.
Datum
Izvor "Liesegang banding" in quartzose sandstone (Upper Paleozoic; quarry near Crossville, Tennessee, USA) 2
Autor James St. John

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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/40280403530 (archive). It was reviewed on 6. decembar 2019. by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

6. decembar 2019.

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skraćeno ime autora Serbian (transliteracija): James St. John
Flikr Serbian (transliteracija): 47445767@N05

status autorskog prava Serbian (transliteracija)

zaštićeno autorskim pravima Serbian (transliteracija)

3. novembar 2012

model kamere Serbian (transliteracija)

vreme ekspozicije Serbian (transliteracija)

0,003125 sekunda

žižna razmera Serbian (transliteracija)

8

žižna daljina Serbian (transliteracija)

6,2 milimetar

ISO brzina Serbian (transliteracija)

80

kontrolna suma Serbian (transliteracija)

1f20a845a5cb92790285f0fc43f16502fca278ca

veličina podatka Serbian (transliteracija)

5.311.171 bajt

visina Serbian (transliteracija)

2.535 piksel

širina Serbian (transliteracija)

3.993 piksel

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trenutna05:13, 6. decembar 2019.Minijatura za verziju na dan 05:13, 6. decembar 2019.3.993 × 2.535 (5,07 MB)Ser Amantio di NicolaoTransferred from Flickr via #flickr2commons

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