File:Iron banding 01.jpg
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DescriptionIron banding 01.jpg |
English: An ashtray carved out of banded ironstone, showing the clear red-grey banding that resulted from photosynthetically produced oxygen reacting with soluble iron (II) compounds dissolved in water to form red, insoluble iron oxide, which precipitated out to form the red bands. The alternance of red and grey bands is not due to short day/night cycles related to the photosynthesis activity. It has a longer period and is related to much longer cycles, such as these of varve rhythmic deposits, release of soluble Fe2+ at the mid-ocean ridges, or biological cycles of the cyanobacteria (starved by the depletion of Fe2+ ions, or poisoned by some by-products of their metabolism. The mesobanding structure could also be due to segregation processes occurring during mud sediments deposition and compaction. A few millimeters thick grey band cannot form during night: it would be a considerably high sedimentation rate. If it was the case, about 2 meters sediments (a considerable thickness) would settle each year which would correspond to a few kilometers sediments on a period of one million years. This is not realist and not compatible with best estimations. |
Date | |
Source | Own work |
Author | Oggmus |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 15:36, 13 September 2014 | 1,550 × 1,300 (915 KB) | EuroCarGT (talk | contribs) | Rm background per request at Wikipedia's Graphics Lab | |
08:01, 4 February 2014 | 1,550 × 1,300 (498 KB) | Oggmus (talk | contribs) | User created page with UploadWizard |
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Width | 1,550 px |
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Height | 1,300 px |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Adobe Photoshop CC (Windows) |
File change date and time | 11:33, 13 September 2014 |
Exif version | 2.21 |
Color space | Uncalibrated |
Unique ID of original document | D7BA7422464D9F597EE150E0FAA4C1CE |
Date and time of digitizing | 07:14, 13 September 2014 |
Date metadata was last modified | 07:33, 13 September 2014 |
IIM version | 15,046 |
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