Banded iron formation
Numéro d’image : 11742164
| Banded iron formation,polished surface. Banded iron formation (BIF) or banded ironstone is a rock formed from alternating layers of the minerals jasper,haematite and tiger eye. At greater than 3 billion years of age these are among the oldest rocks on Earth. They were laid down in shallow seas where primitive bacteria caused iron to be oxidised and precipitated. Subsequent deep burial of the rocks,and tectonic movements,have caused the rock to alter and deform. This sample shows a small section of rock has slipped down between two parallel faults and has thus become disjointed with the neighbouring sections of rock. Magnification: x2.5 at 4x5ins size | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library / Wiersma, Dirk |
| Taille de l’image : | 3730 px × 4722 px |
| Model Release : | Non requis |
| Property Release : | Non requis |
| Restrictions : | - |
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