Ferricrete
Ferricrete (lat. Ferrum = iron , English concrete = concretion ) are very hard crusts of the earth's surface in which iron is involved. These are cemented iron oxides or oxidized solutions of iron salts .
In South Africa , a region with frequent finds, the stones are also called Koffieklip (= coffee stone). Other names are ferriginous duricrust (= iron-containing Duricrust ), hardpan (= Ortstein ), iron pan (= Eisenstein), ouklip gravel (= Ortsteinkies) or Ngubane.
description
They are found near the surface, especially in today's deserts . The color is mottled gray or reddish.
Ferricrete also contain sediments and materials that are not native to the sites but were transported there.
They appear as hematites or laterites , the latter with the empirical formula Fe 3 O 3 .
meaning
Ferricrete bear witness to the formation of relief during the Tertiary period .
Emergence
Ferricrete emerged under similar circumstances as Silcrete . In the Old Tertiary, for example, extensive rinsing of the floor or cement ceiling. Stretches of land may also have been washed over by lowland rivers. The consequence of this was a mostly complete relief of the relief, which had an effect in amphibious, i.e. poorly drained, landscape.
Groundwater close to the surface now led to the precipitation of silica (Silcrete) or iron oxide (Ferricrete). In Ferricret, depending on the amount, there was a gray or blotchy red color.
use
Ferricrete are widely used for road construction in rural South Africa.
Web links
- Correlations in the geomorphology (Engl.)
- Page about unusual ferricrete-Fund in Ireland (English).
Individual evidence
- ↑ http://www.geodz.com/deu/d/Duricrust
- ↑ Archive link ( Memento of the original from February 18, 2012 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
